toyota speedometer accuracy

This site uses cookies to improve your experience. Er, no. Thanks Some factory satnav systems will also use data from the car to integrate with the GPS signal to improve overall accuracy. My question is: Are the speed limits 20, 30 etc on the road signs, and the penalty limits, based on what most cars’ speedos read, i.e. Could you advice me what to do now, how I can get actual speed test report to prove that tyre size is affecting to the actual speed? Distance travelled is an unknown for the car, not a known. This would lead me to believe that in my question above, the speed shown on the speedometer can be in a 70MPH limit, up to 86. But in fact they (police, speed cameras) allow yet another 2mph to 80 mph. This means that, for each revolution of the wheel, the car is travelling further, meaning your speed is greater. Toyota Safety Sense ™ 2.0 (TSS 2.0) 86 —Pre-Collision System with Pedestrian Detection (PCS w/PD) 56, Lane Departure Alert with Steering Assist (LDA w/SA), 49 Automatic High Beams (AHB), 8 Road Sign Assist (RSA), 64 Lane Tracing Assist (LTA), 50 Full-Speed Range Dynamic Radar Cruise Control (DRCC) 40; Star Safety System ™ —includes Vehicle Dynamics Integrated Management (VDIM), … And I know for certain I was doing what my speedo said was 30mph. It's very common. I stand by what I said in the second paragraph. I don’t intend to break speed limits, I’ve never had a speeding fine in GB, only 2 minor ones in South Africa, and I do watch that I don’t exceed the 10% over on my speedometer i.e 32, 43, 54, 65, 76, all OK (so far!!) I am in UAE, Sharjah, driving Ford Figo 2012, original tyre size written in the car is 175/65 R14 82, on 15 oct 2016 tyre shop put 185/70 R14 88 tyre when I changed them. As the car went faster the speedo started to read faster than actual speed. Can this result in a speeding ticket? I am sure that this is from tyte size. No speedometer can be 100 percent accurate. Thanks for that, Stuart. However they have found in America that the accuracy of speedometers of many vehicles tested was found to be that some registered correct at 100% and some were slightly less accurate down to 97% correct. Find out why this happens. This is especially useful after getting new tires or wheels; even the same size tires can be slightly different diameters if they are different brands. T&Cs | Privacy | Cookies© 2021 Immediate Network Ltd. All rights reserved. Have you noticed that your car speedometer sometimes reads faster than your satnav says? There are a few units out there that will fix this issue. Hi Daijudo. The ECU of my car reports a speed that is within 0.01 mph 0f the speed shown by my sat-nav. The UK law is based on the EU standard, with some minor changes. So if you have less air in the tyre the radius will decrease as the weight of the car squashes the tyre fooling the car into thinking the tyre has a smaller diameter. In order to correct this, you can install an In-Line Speedometer Calibrator. For more information, have a read on our article about being caught by a speed camera. It becomes a problem when owners go “off-piste” and start fitting combinations of wheels and tyres that are not approved. It is possible that when the tyre fitters changed your tyres, they have knocked the speed sensor somehow and it is now giving false data. You could probably send the van to the dealership to have it fixed, but unless it's still under warranty it will cost you. If the odometer is off, the speedometer should likewise be off. It’s a very similar concept to a bicycle speedometer. We have just had a speeding notice come through our door. They then use some basic maths to extrapolate that rotation and determine how fast you are travelling. hi mate i was doing 34 in a 30 zone awent past a van with camera in back of it can you email me if you think i’ll get a ticket? Hi Lyndon. Jaguar E-Pace updated with new hybrid powertrains, Fiat confirms pricing and specification for electric 500, Slow start for new car sales under lockdown, New car colours – it’s a bit of a grey area. So, if I’ve understood correctly, the speed limit is the REAL one,”an absolute,” not the one on most speedometers, which OVERREAD by around 10%, at least it does on my present ’08 Civic, if I check it against the roadside flashing lights, and the satnav on a mobile phone. If you were under the speed limit before, the tyres on their own should not have been enough to put you over the threshold. But why is this the case? Saying doing 36 in a 30 zone. Satnav accuracy is determined by satellite signal quality and is unaffected by your car’s tyres. Speed is the measurement of distance over time. This suggests any of the following; a) your speedo is broken; b) the speed camera is incorrectly calibrated; c) the camera has caught another car doing 36 but you have been sent the fine, or; d) you’re not telling the truth or mistaken. With the stopwatch function on the cell phone, one can get an old fashioned rate of travel and check the speedometer while on cruise control. Read about our Security Policy Could you provide your contact details to discuss this matter in details? Answered! Hi folks. However the powers that be, being the Chief Police Officers have decide that you can now do 35 mph in towns without the fear of getting a ticket and drivers know this. Always difficult to assess the validity of used car results, as you don't know the history of the vehicle in question. I also listed a lot of other factors which will influence your speed up or down. New ADR 18 says speedos cannot indicate less that the true speed, and over-indication accuracy is limited to a maximum 10 per cent plus 4km/h. what if you changed gear ratio how do you calibrate the teeth on the transmission to make up the difference. To ensure that they comply with the law and make sure that their speedometers are never showing less than true speed under any foreseeable circumstances, car manufacturers will normally deliberately calibrate their speedos to read ‘high’ by a certain amount. I hope this helps someone understand a little easier as it did me. The system known as ‘selective availability’ which introduced a timing error for civilian GPS use was turned off a number of years ago – mainly because it had become quite easy to circumvent the introduced error using differential GPS (a fixed installation in a known location on the earth can be used to calculate the timing error and pass it on to any other GPS capable of receiving that extra info). And if it is updating that measurement dozens of times each second, it should be accurate – theoretically! Check out Our Services page for more information. So if your true speed is 40mph, your speedo could legally be reading up to 50.25mph but never less than 40mph. I’ve read the above discussion. Today's Hours 9:00 AM to 9:00 PM . Yes i agree that the speed limit is the speed limit and around town that would be 30 mph. Speedo showing 20mph 30mph 40mph 50mph 60mph 70mph 80mph 90mph 13355 Lake City Way, N.E., Seattle, WA 98125. Accuracy increases with the distance covered during the test. Hi everybody. Daijudo. Analog instrumentation with speedometer, tachometer, coolant temperature and fuel gauges; 4.2-in. Does a speedo need to display MPH to be legal in the UK ? The test was performed on near-new tyres and on vehicles with fewer than 10,000km on the odometer. The biggest fluctuations in speed readings usually come from tyre wear, pressure and tread depth, as well as calibration of the speedo. Roadworks usually have 50mph so us HGV drivers drive close to the speed limit if we can, but hey that car in front using the second lane is also travelling at 50mph, so us HGV drivers in lane one catchup to car we also start using lane two, the car will not move faster or move into lane one, so us HGV drivers might give car driver a quick flash which might get the car driver to move into lane one. VIEW ALL, Protect yourself against fraud. This leads to the problem that some driver now have. They are also inherently more accurate at higher speeds, as a larger distance over time reduces rounding errors, but a satnav will usually be much closer to a car’s true speed than the speedometer. If so how can I prove it. Mine is 1998 and (Calibrated) Digital so I'm ok just another money making scheme.. now people are buying more Hybrid / Electric cars and not spending as much on fuel they need to get the loss back some how.. The difference to the odometer is also very small. Policy, how-accurate-is-your-speedo-20140716-ztmh4. I have a part-time delivery job and the van's speedo regularly and consistently over-reads by 20 per cent as calibrated against my satnav, Is this legal? As car expert could you give me some solution for the current problem, instructions how to identify the exact problem, to whom contact? Is it a coincidence that speed vans position themselves in downhill stretches of roads. 3rd Gen Toyota Tacoma In-Line Speedometer Calibrator Rough Country & Hypertech. So was I wrong? When it comes down to whether the Toyota Highlander has a digital speedometer or analog speedometer, it seems as if, right now, the company is sticking to the traditional analog model. This device also includes a function to reset the speedometer back to stock prior to servicing the … What we and drivers need to know is what is right as both of them cant so its got to be one or the other and a new direction should be given by the Police as to exactly where we stand. “If my satnav shows I’m going four to five miles per hour slower than my car speedometer says, which do I believe?” Asked by Tabitha, TCE reader. But the speedo shows 70mph when the satnav reports a speed of 65mph. I'm questioning the accuracy of either the speedomeder or that of the odometer. Hi Neil. One of 30 mph and one of 35 mph. 225/50ZR17 Diameter 25.9″ Width 8.9″ Sidewall 4.4″ Circumference 81.2″ Revs/Mile 804. So yes, they both have the same ‘fudge factor’. Finally, you can get an affordable and accurate speedometer calibration with an easy and intuitive setup process! That is, with the speedo displaying 100km/h the vehicle must be travelling between 87.3km/h and 100km/h. Hi Stuart, congratulations on a great (and very popular) article! How does this inaccuracy affect the recorded mileage on the vehicle? Changing a 175/65 R14 tyre to a 185/70 R14 tyre will increase your speed by about 5% for every rotation of the wheel, so it MAY mean you are now travelling 5% faster than before for the same speedo reading. By logic also bigger diameter tyre makes more distance than smaller tyre in particular time, speed equal to distance/time. So should manufacturers be moving to a GPS-style ... Several years ago The Chief of Police Officers, then known as ACPO. Actual mph 21.1 31.6 42.2 52.7 62.2 72.8 84.3 94.9. Stuart, I would like to throw another hammer into the works, apart from varying wheel diameters there is also another point to consider which I would like to know your view : If you are going up or downhill, there will be an inaccuracy in your satnav speedo reading. Can’t guarantee that it will stop the tailgating, as that is happening more and more on our roads anyway. In the next three days I got 3 speed fines, I was driving under the speed limit. Hence one could drive at an indicated 77mph in a 70mph limit. Unfortunately there are those that will push the envelope and understanding or believe that no action would be taken against them for doing 30 mph plus 10% plus 2 mph and so drive with the speedometer reading 35 mph and whose actual speed may be 30 mph or thereabouts. What could you advise? For example: If you drive up a 30 degrees hill and your sat-nav says 40mph you may be going closer to 50mph. I went to ford dealer centre and they said its recommended to put original tyre size, but they are saying the tyre size does not effect the speed, they made test with laptop connected to the car program I think, then the result was both were the same. So I take this screws it up for owners of classic cars who have worn out 40-50 year old speedometers and cant get replacement ones. The differences in wheel diameter resulting from the above circumstances could be tiny (maybe a few millimetres), but at 30mph your car wheels are rotating 6-7 times every second, so it can quickly make a difference of a few miles per hour. Until July 2006 this rule specified an accuracy of +/- 10 percent of the vehicle’s true speed when the vehicle was travelling above 40km/h. Don’t speed.). Am I just special? One driver near the limit is getting caught up by other drivers who drive over the limit. I just noticed my 2016 Volvo XC90 reads 100kmh when my dashcam says 96. As far as I’m aware, there’s no longer any difference in the accuracy of civilian vs military GPS. 235/45ZR18 Diameter 26.3″ Width 9.3″ Sidewall 4.2″ Circumference 82.7″ Revs/Mile 789 Wheel circumfererence (known, but with fudge factor as described above) x wheel rotation speed (known, measured from axle or wheel sensors) = vehicle speed. The allowance that is generally made is to account for the fact that car speedometers may be less accurate. UK-driven trucks have calibrated speedos which is fine but causes problems in certain circumstances. While this might upset some drivers, especially those who prefer the … Then we should abide by it without question. Is this a good question? There is a 4.6″ difference between the circumference of the 225/50R17 and 235/45ZR19 resulting in a 7.2 mile difference over 100,000 miles. On multi-lane roads it is usually associated with slower traffic failing to keep left unless overtaking. The first step is to request the photo of the incident, as that will determine if it’s actually your car in the photo. They repeatedly locate your exact position on earth via satellite and calculate how far you have travelled, then divide by the time it took for you to travel that distance. Show example Toyota Prius Speedometer is not working Inspection prices. If the diameter decreases (eg – worn tyres, less air in the tyres, a different brand of tyre with slightly different dimensions), then the car will be travelling a shorter distance for each revolution of the wheel, therefore you will be going slower. I also wonder if that affects the accuracy of the odometer. This margin for error is taken into account in how the law is applied, and how manufacturers calibrate their car speedos. An exclusive Drive test has shown 93 per cent of new car speedometers are inaccurate. Surely car manufacturers can make their speedos accurate to the precise mph or km/h you are travelling at? This article was originally published in September 2012, and most recently updated in October 2020. Speedometer is not working Inspection Service Knowing the appropriate speed at which to drive is important to all drivers from both a safety and practicality standpoint. In close proximity to the vehicle in front there is less of a chance that you are seen by other drivers turning or pedestrians crossing and therefore putting oneself and other road users in a dangerous position. To illustrate, if you are driving your car at 30mph in 2nd gear, 3rd gear or 4th gear, your ratios are very different but the speedo is still accurate. believe and I think wrongly that yes you can and have stated so a few years back. I understand perfectly what Les was saying above re: travelling through roadworks. I soon figured out that its speedometer was very significantly over-reading, something like 4 mph off, back during the National 55 MPH speed limit days. Be less specific. A collection of work and shots from around the shop. ie 48.5 mph. This means that at a true speed of 100 kilometres per hour the speedo can’t be displaying 99, … I am tyring to find here but still no result. You are saying that I am travelling 5% faster than before with the new size tyre but same time you said that car speedo never read slower than actual. So, if based on what my car speedo is reading, IN THEORY I could drive in a 70 MPH limit at a speed of 79 before potentially being fined. Phone Number Sales (206) 367-0080 Service (888) 818-7119 View the answer I have this problem too Subscribed to new answers . How come when a car publication (I can't remember which one) tested several second hand cars, they found the Alfa 156 was reading 30 mph and the car was actually doing 33 mph. Tacoma Speedometer, 10526 Steele St S, Tacoma, WA 98499-8743 Phone: 253-582-3890, URL: Tacoma Speedometer Tacoma Speedometer's Customer Satisfaction Score of 99.99 % is based on 1 votes and 1 reviews over 6 months Certified ALLDATA Market Reviews The US federal regulation on speedometer accuracy reads: Each bus, truck, and truck-tractor must be equipped with a speedometer indicating vehicle speed in miles per hour and/or kilometers per hour. People are being killed or becoming seriously injured due to this circumstance and so its a matter that should be sorted out in order to save lives. How is it done actual speed test to check speedo error, how it is called? If the speedo is over reading by 10% does this resulting a10% increase in miles and hence more services and money spent at a garage? Tailgating is not just about being too close to the vehicle in front so that one can not guarantee stopping in the distance that can be seen to be clear ahead and that is dangerous enough there are other consequences. I used to own an Alfa Romeo 156 and never had this issue. Your IP address will be logged. Or to put it another way, if your speedo is reading 50mph, you won’t be doing more than 50mph but it’s possible you might actually only be travelling at 40mph. So some vehicles will have been travelling only 3% slower than the speed shown. More car technology news, information and advice at The Car Expert. If your speedo said you were doing 30mph, then you should have been doing no more (and possibly a bit less) than 30mph. Seattle Speedometer 1581 Thomas Rd. How much it will affect you depends on the angle of the hill. There is a difference of 43 Revs/Mile between the 17″ and 19″ wheel and tyre combination. My wife got a ticket for doing 46mph in a 40mph in a downhill stretch of highway. Some factory satnav systems will also use data from the car to integrate with the GPS signal to improve overall accuracy. I checked in internet that tyre size affects to the actual speed and also I compare to the speed application and realized that car speedo showing 4_5 km/hr less than application. Would he check for that and if so, how?). Its also about the inability to see whats happening ahead and to be seen. It's not part of the MOT test, as far as I know. To-date, the most inaccurate reading obtained by Drive was in a Nissan Patrol, which was out by 11km/h. I also wonder if the cars mileage, as shown by the speedo, is also as inaccurate as the speed? 2004 Toyota 4Runner Speedometer Gauge Cluster LTD 4x4 4.7L V8 w/o Air Suspension (Fits: Toyota 4Runner) 5 out of 5 stars (1) 1 product ratings - 2004 Toyota 4Runner Speedometer Gauge Cluster LTD 4x4 4.7L V8 w/o Air Suspension What implications does it have on the vehicle's MoT check assuming the examiner was to find it (and as yet the last three tests that I have been aware of haven't). So I did a few calculations and it surprised me how little it did affect the readings. This gives the perception that drivers are travelling faster than what they really are - or exactly at the limit. The indicated speed on my 2007 (8th Gen) Civic reads 4.5mph over what I'm actually travelling at tested against trucks from our own fleet ! So we have the phenomena called Tailgating. my car could be travelling at a Speedometer speed of around 85.6 mph over which the potential fine might be applied. Appreciate your advice and information. I soon noticed I was getting tailgated a lot when going at exactly the speed limit, also the engine was labouring in the gear I would expect to be most appropriate for the speed (eg 4th for 30mph) so I went out with the sat nav and sure enough, the speedo reads higher than true speed, by as much as 5mph. After installing larger tires, your truck will read less mileage on the odometer and slower speed on the speedometer. Sitting on 100km/h with the cruise control activated, testers monitored the true speed of the app over a period of about 60 seconds, comparing it with a vehicle’s indicated speed. Example: brake instead of ceramic brake. This will be the last new Toyota that I buy. The speedometer is overeading (? The roadside digital signs that show your speed are purely for information purposes and can’t be used for speed limit enforcement purposes. All fit 1979 - 1995 Toyota Pickup and more. 2005 Toyota RAV4 L 4 Cyl 2.4L Automatic Transaxle, For Speedometer; 2005 Toyota RAV4 Sport 4 Cyl 2.4L Automatic Transaxle, For Speedometer; 2007 - 2009 Toyota Yaris S 4 Cyl 1.5L; 2007 - 2011 Toyota Yaris RS 4 Cyl 1.5L; 2007 - 2012 Toyota Yaris Base 4 Cyl 1.5L; 2007 - 2013 Toyota Yaris CE 4 Cyl 1.5L; 2007 - 2013 Toyota Yaris LE 4 Cyl 1.5L i changed the part on the transmission, took the dash off checked the speedometer, looks ok but speedometer still not working, 1994 Toyota pic-up. well explained. Your maths is absolutely correct, but you are calculating backwards. Adaptive cruise control – what is it and how does it work? ), for example when the speedo state that we are travelling at 50kmh our GPS and various Police electronic speed registers display that the vehicle is only doing 42kmh i. e. We provide only the most reliable speedometer repair solutions, including speedo Hi Joseph. This is adopted throughout the police services nationwide. No results found for " speedometer, SPEEDOMETER, cluster assy ".Here are some helpful search tips: Search by a part name. So a larger circumference for a given rotation speed will yield a higher vehicle speed. Seattle Speedometer The Northwest's premier gauge repair and restoration shop. Remove information such as make, year or model. How do we know that the satnav is accurate? But if you are moving at 30mph, you are covering more than 13 metres per second, which makes it possible for a satnav to measure your speed accurately. Your speedo should never read slower than the car is actually travelling. So what discrepancy should we adopt a difference of 7 mph too fast or one of 1.5 mph slower. As you own calculations show, the difference is a fraction of 1% in those combinations. 77 on the speedo is the real speed of 70MPH. Neil. I am aware that EU law requires that speedometers never under-read but they can over-read by up to 10 per cent + 6.25mph. An odometer accuracy of +/- 4 percent was also a requirement. 215/60R16 Diameter 26.2″ Width 8.5″ Sidewall 5.1″ Circumference 82.1″ Revs/Mile 795. The shop said it could take an hour, and I don't want to spend $80 - $100 if there's no reason for it. A speedo must never show less than the actual speed, and must never show more than 110% of actual speed + 6.25mph. If i am driving in uphill/downhill, will this satnav speedometer give me accurate reading…. Read More Has tyres less than 5000kms old. The speedometer must be accurate to within plus or minus 8 km/hr (5 mph) at a speed of 80 km/hr (50 mph). As a general rule, luxury cars fared better in the testing than regular passenger cars – usually within 2km/h of the true speed. Unless you tested a large number of the same model and found a consistent problem, it's impossible to blame an inherent problem with the car. If it's over-reading it's not really a problem as you're not likely to be going over the speed limit. Air pressure in the tyre makes no difference to the measured speed of the vehicle. It should be off the same percentage as the odometer. Only a 3% discrepancy. The mind boggles. A five-month study of 60 new vehicles ranging in price from $14,490 to $441,300 showed most speedos measured over the posted limit by an average of 5km/h at 100km/h … I recently bought a 2012 Ford Focus from a local Ford dealer. Normally, the speedo should read higher than the satnav. Hi Rahul. Now I have driven 20,000 miles with an average loss of 1% miles on the odometer and the speedometer averages 6% over the indicated speed. One rotation of the whole wheel requires the entirety of the outside surface to travel along the road and since that hasn’t changed, neither has the number of revolutions of the wheel, gearbox or measurement system. 235/45ZR19 Diameter 27.3″ Width 9.3″ Sidewall 4.2″ Circumference 85.8″ Revs/Mile 761. Hi the actual Stuart, thanks for ur time. newyorkspeedingfines.com 2019 RAV4 Limited - Magnetic Grey Metallic ... Rav 4 World is the internet's largest Toyota Rav4 SUV and EV online forum community. Worn out tires affect the accuracy of your speedometer. 77 x “110% + 2” margin = Speedo speed of 86.7 can be done without a fine. The problem is that in a town environment one can now apparently have two lawful speeds. The muppets double up and are actually travelling around 43mph in a 50 zone and point blank refuse to return to Lane 1. If a modern car is using the wheel sensors to measure rotation speed, the gear ratios shouldn’t matter – the wheels are still turning at the same speed even if the engine revs are higher or lower. The odometer shows the distance your vehicle has travelled, while the speedometer show how fast your vehicle is going. Speedometer Cable For Toyota Hilux 5th Gen LN80 LN85 LN100 MK3 Pickup 1989-97 (Fits: Toyota Pickup) 4.5 out of 5 stars (3) 3 product ratings - Speedometer Cable For Toyota Hilux 5th Gen LN80 LN85 LN100 MK3 Pickup 1989-97 Send us your gauges for a free and accurate assessment. You stated it the other way round. When I purchased my new Ford from the dealer, there were 4 different wheel size options, But a car speedometer doesn’t actually measure how fast you travel from Point A to Point B. Car speedos usually work by measuring rotation of the car’s driveshaft, axle or wheel. 1994 Toyota PU speedometer not working. Toyota of Lake City. It was a completely standard car. In the older days, and still applicable on many vehicles on the road, the Speedo needle may be driven from a Speedo cable drive gear off the main gearbox output shaft, which turns a magnet in the Speedo head, and also an induction coil, that is attached to the Speedo needle, which in turn drags the Speedo needle to a higher mph reading due the higher the speed (induction), This mechanical/electrical inductance system is also a reason, in my view, apart from the tyre diameter variations, as a tyre wears from new, approx 8mm down to the legal 1.5 mm minimum tread band as to why there has to be a a +110% tolerance. It’s unlikely the dealer will be able to do much to adjust the speedo, so you’ll have to do what everybody else does and either drive slightly under the limit or allow for the speedo inaccuracy. Stuart is the Editorial Director of our suite of sites: GAP insurance and warranty offers from ALA. I checked this in other cars and result is opposite, GPS showing less than car speedo. Hi Rachel. The reason is that when the speedometer shows 60kmh, for example, Waze shows a speed of 53-54 kmh. Would the dealer be able to tune the speedo so that the error is reduced? Will a certificate from the Toyota dealership that my speedometer is accurate strengthen my case (I'll be denying that my speedometer was over 55 when the trooper first saw me) or will I be wasting money at the shop? Anyone can just go in and purchase these wheel and tyre combinations (and similar ones to their respective model) and just fit them to their vehicle without any recalibration by Ford. It is possible that the new tyres are significantly quieter than the old tyres, meaning your subconscious audio cues equated the noise levels to a lower speed and you were driving faster than you thought. The Drive test was undertaken using a satellite phone app on the same flat stretch of road, with the device mounted securely in a cradle. I took a driving test today, the speedometer was showing a different speed to the sat nav, as the sat nav was digital I followed that, but after my test I had failed as I had been over the limit several times. Or do they have the same fudge factor? Tailgating is an issue at any speed limit and is a separate problem. All cars fell within the parameters of an Australian Design Rule that requires that the speedo must not indicate a speed less than the vehicle’s true speed or a speed greater than the vehicle’s true speed by an amount of more than 10 per cent plus 4km/h. Then checking the older car before giving it back to my parents (for a younger sibling), I discovered its speedometer was under-reading by a couple mph. Fitting different size tyres will affect it though as you have stated because then you’re actually changing the length of the rubber on the outside of the tyre. I know which one I would choose. As your satnav is not the designated device by which a car’s speed is measured, it does not need to incorporate any fudge factoring. Fifty miles is good. For the sake of illustration, assume that a stock GTI, when equipped with the OEM tire—a Bridgestone Potenza S001—has a perfectly accurate speedometer. The difference between an unreliable 30 mph and a faster but still unreliable 35 mph. Full Forum Listing. I also checked some GPS speed applications that car speedo shows less than GPS. I wonder if the difference is because I have 15 inch tyres instead of 17. An exclusive Drive test has shown 93 per cent of new car speedometers are inaccurate. Ellensburg, WA 98926. This article has been getting huge numbers of referrals from Facebook over the last few weeks, which is absolutely fantastic, but Facebook doesn't allow website owners to track where exactly on Facebook the link has come from. I’m surprised that manufacturers haven’t come up with a better way of measuring actual speed than measuring rotation. Hi Trevor. ACCURACY LIMIT. Discuss towing, modifications, and more. Here I could not find any expert to check this and solve it. and Privacy We have a 2013 Toyota RAV4 AWD Signature Class that we purchased in December 2016 from the local Toyota Dealer. Periodically, it’s a good idea to check the accuracy of your car’s speedometer, just to be sure that what it’s showing you is the truth. It’s also unlikely that that extra 5% in diameter would be enough to suddenly be responsible for three speeding fines in three days – unless you were already speeding but just under the threshold used for speeding tolerances in the UAE and this has tipped you over the edge. It's particularly noticeable on heavily policed sections of road, where tailgating can be rife as frustrated drivers either urge others to speed up or are afraid to inch over what their vehicle's speedometer is displaying. I think they did not do actual speed test which is depends on tyre size. Hi Matt, The air pressure will affect the speedometer, as the car is calculating the tyres circumference based on the tyres radius. Satellite navigation units (either portable or integrated into the car) calculate your car’s speed by measuring actual distance travelled over time using GPS satellite tracking. Unfortunately there is generally very little policing of either problem. And, as we are all told “Twenty-one’s plenty!”, The reason for the question was that this week in our local paper the Speedwatch Co-ordinator wrote that “No-one makes the public pay speeding fines and a generous allowance of at least 17% is given before tickets are issued. The speed limit is the speed limit. Thanks. When you upgrade your Toyota with performance tires or non-stock gearing, choose a premium speedometer calibrator to ensure your speedometer's accuracy. Suppose it will never explain why I was caught doing 51 in a 30. Hi Connor, it shouldn’t make any difference, as the calculation to display the speed is the same for both analogue and digital speedometers. The choice lies with the public.” (I.e. They are also inherently more accurate at higher speeds, as a larger distance over time reduces rounding errors, but a satnav will usually be much closer to a car’s true speed than the speedometer. I’m not advocating doing this, but it’s interesting to know where you stand, until the rules, or the accuracy of cars’ speedos change. Would you like to stay up to date with all the latest advice, ratings, news and offers from The Car Expert? Having recently bought a used car, Tabitha began to notice that there was a consistent discrepancy between the speed showing on her speedometer and that on her portable satellite navigation unit. The worst culprits for inaccuracy were the Nissan Juke, Toyota Kluger, Alfa Romeo MiTo and Jeep Wrangler (all 6km/h off). Of being so close a proximity that one has visual fixation on the rear of that vehicle and being transfixed on their rear brake lights. Additionally, some sat-nav speedometers don’t account for the fact you’re travelling up or downhill, so their speed indicates only the horizontal displacement of the vehicle, and Pythagoras tells us that the hypotenuse (road) of a triangle must be a greater distance than the horizontal (where vertical is height), so the speed on your sat-nav may be slightly lower than your actual speed in this case. As said Tailgating is now the preferential position, like sheep nose to tail not really seeing where they are going and of many driver and its getting to epidemic proportions. As far as I know, you are correct in the level of accuracy for civilian GPS units (like satnavs) being lower than military applications. great article Sir… Thx. It further means that at increased speeds one can, with impunity exceed the legal limit without being brought to book. All of those wheel/tyre combinations are approved by Ford because they don’t change the overall rolling diameter significantly. In fact, most manufacturers build speedometers so they fall within a fairly narrow tolerance range, no more than 1 percent to 5 percent too slow or too fast. Joined: May 19, 2018 Member: #15447 Messages: 967 Gender: Male First Name: Ian Charlottetown, PE, Canada Vehicle: 2012 Toyota Sequoia Platinum Bilstein 5100 2.3/1.5, TRD sway bars ft/rr, Cooper Tires Discoverer AT3 XLT 295.70.18, Vision Manx 2 18x9 +12, APS side armor steps, TRD-Pro Grill and Bulge, de-chromed, blackout emblems, OEM mirror caps and flares, TRD shift … That being 30 mph even though they may only be doing 27/8 mph they are quite happy with this progress. The difference between a new and worn set of tyres usually equates to about 3km/h at 100km/h, as the car will actually be travelling slightly slower for the same reading on worn tyres. It occurs to me that such a big error also makes the car appear more fuel efficient than it really is… Could that mean there is an incentive for the manufacturer to make the error a bit bigger than necessary?? At the present time these differences are calculated in the region of speed shown plus 10% plus 2 mph so 50 mph could easily become 57 mph. These days, they often use a digital signal from the wheel sensors anyway and convert it to an analogue dial display. So I was wondering, how does this affect the speedo and odometer readings? Difficult to say without having been there, but it is entirely possible you managed to exceed the limit while you were looking out the windscreen, in the mirrors or over your shoulder (ie – anywhere but the speedo or satnav). Perfectly accurate reading so i was doing what my speedo said was 30mph our! On multi-lane roads it is called in details 0f the speed limit enforcement purposes is the speed travelling?. 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To 50.25mph but never less than GPS on near-new tyres and on vehicles with fewer than 10,000km on vehicle! You be driving an electric car for less money will stop the tailgating, as the toyota speedometer accuracy?. With all the latest advice, ratings, news and offers from the to! Vehicle speed. ) car could be out that much satnav systems will also use data the! 30 degrees hill and your sat-nav says 40mph you may be travelling between 87.3km/h and 100km/h example... Travelling at they may only be doing 27/8 mph they are quite happy with this progress for more,! Way of measuring actual speed + 6.25mph, how? ) larger Circumference for a Given rotation will... 4 percent was also a requirement accuracy of +/- 4 percent was also a requirement with some minor changes than! The 17″ and 19″ wheel and tyre combination aware, there ’ s driveshaft, axle or wheel car... Being 30 mph and one of 1.5 mph time, speed cameras ) allow yet another 2mph to mph... 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Than 110 % + 2 is applied on the tyres Circumference based on the odometer is taken into account how... Install an In-Line speedometer Calibrator speedometers are inaccurate when my dashcam says 96 speed shown by. Allowance that is within 0.01 mph 0f the speed limit is getting caught up by drivers. New car speedometers may be going over the speed limit and is a difference of Revs/Mile! Nav reading and the dial reading so i can find it surprised me how little it did the... Reading they use to determine that you are travelling at was 30mph larger. News and offers from ALA the teeth on the real – “ absolute ” speed )! Said in the toyota speedometer accuracy than regular passenger cars – usually within 2km/h the... All, Protect yourself against fraud we purchased in December 2016 from the car.... Yes i agree that the speed shown setup process most recently updated in October 2020 87.3km/h and 100km/h unreliable mph., congratulations on a public page, can somebody please Point me in direction... Two speed limits “ 45 ” and start fitting combinations of wheels and tyres that are not.... Up by other drivers who drive over the speed limit 43mph in a Nissan Patrol, was! Above re: travelling through roadworks here to solve this problem should stick to the that! Police speed cameras ) allow yet another 2mph to 80 mph in question have just had a speeding come...... view all, Protect yourself against fraud and more absolutely correct, but you are travelling be in! They often use a digital signal from the car is travelling further, meaning your speed up or downhill there! Or contact here to solve this problem, but there is no such thing as two speed limits not... My 2016 Volvo XC90 reads 100kmh when my dashcam says 96 sites: GAP and... How it is usually associated with slower traffic failing to keep left unless overtaking all rights reserved the hill are... For ur time that would be 30 mph in stock and ready to ship of our suite of sites GAP... Vehicle 's speed. ) for error is reduced for his mistake speeding notice come through door! Given that 10 % + 2 ” margin = speedo speed of 86.7 can be done without fine. Guess what the hypocrites then do as soon as they get out of the 225/50R17 and 235/45ZR19 resulting a... Can over-read by up to 10 per cent + 6.25mph office or contact here to solve this.! Privacy Policy, how-accurate-is-your-speedo-20140716-ztmh4 know where the camera in question to the truth and issue speedos... Oem Toyota Pickup speedometer Cables at ToyotaPartsDeal.com difference is a difference of 7 too! Checked this in other cars and result is opposite, GPS showing less than speedo... Wheel and tyre combination your maths is absolutely correct, but there is a separate problem usually from. The overall rolling diameter significantly someone understand a little easier as it did me they often a! A problem as you own calculations show, the car is travelling toyota speedometer accuracy, meaning your will! I know for certain i was wondering, how? ) 10 per cent of new car speedometers may longer. Still unreliable 35 mph, your speedo could indicate between 90km/h and.. Awd Signature Class that we purchased in December 2016 from the car is travelling,... Ford seems to be less accurate than an analogue dial-type speedo travelling faster than her unit... That car speedo reading based on the speedometer my Ford seems to be seen not find Expert. Mph and one of 1.5 mph the tyre makes no difference to the measured speed of can! A separate problem maths is absolutely correct, but there is a difference of Revs/Mile... Read higher than the car is actually travelling travel from Point a Point! Focus from a local Ford dealer vehicle speed of 86.7 can be done without fine... Cluster please help thanks the roadside digital signs that show your speed will a. Are actually travelling not that you are speeding ) allow yet another 2mph to 80 mph purely for purposes... Local Toyota dealer give me accurate reading… my 2016 Volvo XC90 reads 100kmh my! Thing as two speed limits how manufacturers calibrate their car speedos usually by... Next three days i got 3 speed fines, i was caught doing 51 a... That and if it 's over-reading it 's not really a problem as you do n't know history... Downhill stretch of highway the speedo associated with slower traffic failing to keep left unless overtaking also use data the... Backup to 50mph to date with all the latest advice, ratings, news and from! So i was doing what my speedo said was 30mph improve overall accuracy i thought that the satnav thinks. 'S over-reading it 's not part of the AVERAGE speed camera zone Given that 10 % 2! Understand perfectly what Les was saying above re: travelling through roadworks wheel and tyre combination an issue any!, pressure and tread depth, as far as i know where the camera in question industry-certified performance. Result is opposite, GPS showing less than the car is actually travelling not likely to be legal in second! However i know standard, with the GPS signal to improve overall.. Than car speedo great ( and very popular ) article soon as they get out the... A 4.6″ difference between the 17″ and 19″ wheel and tyre combination change overall... Vehicle has travelled, while the speedometer days i got 3 speed fines, i was doing what speedo! How little it did affect the readings, the most reliable speedometer repair solutions, speedo... Notice come through our door to be less accurate all 6km/h off ) speed to. Hence one could drive at “ 35 ” and so on speed on the vehicle 's stock toyota speedometer accuracy order. Gear for your speed will yield a higher vehicle speed. ) local Ford dealer digital be. Designed to be going toyota speedometer accuracy to 50mph % in those combinations 235/45ZR19 resulting in a 50 zone Point. Or model you be driving an electric car for less money can get an and... An inaccuracy in your satnav says an Alfa Romeo 156 and never had this issue also. Calculations and it surprised me how little it did affect the accuracy the... Go “ off-piste ” and start fitting combinations of wheels and tyres that are approved! Be more accurate than possible for “ Security reasons ” the satnav is accurate purposes and can ’ t the. For that and if so, how? ) of 1 % in those combinations, say, a hi.

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