Would a digital speedo be more accurate than an analogue dial-type speedo? That being 30 mph even though they may only be doing 27/8 mph they are quite happy with this progress. How does this inaccuracy affect the recorded mileage on the vehicle? Car speedos usually work by measuring rotation of the car’s driveshaft, axle or wheel. Phone Number Sales (206) 367-0080 Service (888) 818-7119 Don’t speed.). Do we do 30 or 35 mph? great article Sir… 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? There are a few units out there that will fix this issue. 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.. Tailgating is an issue at any speed limit and is a separate problem. Would he check for that and if so, how?). Full Forum Listing. Send us your gauges for a free and accurate assessment. For more information, have a read on our article about being caught by a speed camera. Several years ago The Chief of Police Officers, then known as ACPO. 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), … So what discrepancy should we adopt a difference of 7 mph too fast or one of 1.5 mph slower. Many satnavs are unable to account for changes in vertical direction, so they may be less accurate if you are travelling up or down a steep hill. 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). At most speeds, the speedo reading was several mph faster than her satnav unit was indicating. In this case, car speedo reading based on the original tyre size. But why is this the case? Hi the actual Stuart, thanks for ur time. Thanks. All fit 1979 - 1995 Toyota Pickup and more. 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. Hi folks. Hi Lyndon. Am I just special? A collection of work and shots from around the shop. There is a difference of 43 Revs/Mile between the 17″ and 19″ wheel and tyre combination. 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. Show example Toyota Prius Speedometer is not working Inspection prices. 225/50ZR17 Diameter 25.9″ Width 8.9″ Sidewall 4.4″ Circumference 81.2″ Revs/Mile 804. How do we know that the satnav is accurate? 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. 235/45ZR18 Diameter 26.3″ Width 9.3″ Sidewall 4.2″ Circumference 82.7″ Revs/Mile 789 The speedometer may be calibrated for the 14" wheels.... or it could just be that Toyota set it to show higher than it is actually going to keep you from getting tickets. Could you provide your contact details to discuss this matter in details? 3rd Gen Toyota Tacoma In-Line Speedometer Calibrator Rough Country & Hypertech. Worn out tires affect the accuracy of your speedometer. Vice versa if you have brand new tyres and correct tyre pressures the circumference will be greater therefore your wheel will rotate less times for the same distance and speed will be lower. Er, no. Do you have any office or contact here to solve this problem. Example: brake instead of ceramic brake. 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. Fifty miles is good. Discuss towing, modifications, and more. Some factory satnav systems will also use data from the car to integrate with the GPS signal to improve overall accuracy. This site uses cookies to improve your experience. Is it possible the speedo on my car could be out that much? Distance travelled is an unknown for the car, not a known. at 50 mph that equates to only 1.5 mph. well explained. An odometer accuracy of +/- 4 percent was also a requirement. 235/45ZR19 Diameter 27.3″ Width 9.3″ Sidewall 4.2″ Circumference 85.8″ Revs/Mile 761. The difference in readings - as much as 6 per cent at 100km/h - can partially explain the difference in driving speeds on some freeways. 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. Thanks Suppose it will never explain why I was caught doing 51 in a 30. Replacing its tires with, say, a … 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. 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. The allowance that is generally made is to account for the fact that car speedometers may be less accurate. Shop lowest-priced OEM Toyota Pickup Speedometer Cables at ToyotaPartsDeal.com. 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. 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. Policy, how-accurate-is-your-speedo-20140716-ztmh4. 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. So a larger circumference for a given rotation speed will yield a higher vehicle speed. 1994 Toyota PU speedometer not working. I stand by what I said in the second paragraph. 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. 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. 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. If i am driving in uphill/downhill, will this satnav speedometer give me accurate reading…. Have a guess what the hypocrites then do as soon as they get out of the AVERAGE speed camera zone ? So I did a few calculations and it surprised me how little it did affect the readings. Shipping Address. 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. The problem is that in a town environment one can now apparently have two lawful speeds. Why my car speedor meter not accuret what is wrong with my car speed cluster please help thanks. 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. I used the sizes from the 225/50R17 and 235/45ZR19 as thats where the largest size difference in circumference/revs per mile: Speedometer error between 225/50R17 and 235/45ZR19 As car expert could you give me some solution for the current problem, instructions how to identify the exact problem, to whom contact? 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. I said you MAY be travelling 5% faster, not that you ARE travelling 5% faster. You could probably send the van to the dealership to have it fixed, but unless it's still under warranty it will cost you. 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. 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. On multi-lane roads it is usually associated with slower traffic failing to keep left unless overtaking. 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. The speed limit is the speed limit. While this wouldn’t usually be a problem, it means I would need to take the car to higher than the speedo reading to suit the gear (and risk breaking the speed limit unknowingly), or else put up with the vibration of a labouring gear, or drop down to a less economic gear for higher engine revs. More car technology news, information and advice at The Car Expert. After installing larger tires, your truck will read less mileage on the odometer and slower speed on the speedometer. The app reading was then compared to an industry-certified GPS performance meter, to ensure absolute accuracy. This gives the perception that drivers are travelling faster than what they really are - or exactly at the limit. It further means that at increased speeds one can, with impunity exceed the legal limit without being brought to book. The roadside digital signs that show your speed are purely for information purposes and can’t be used for speed limit enforcement purposes. 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 : By logic also bigger diameter tyre makes more distance than smaller tyre in particular time, speed equal to distance/time. 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. If your speedo said you were doing 30mph, then you should have been doing no more (and possibly a bit less) than 30mph. ie 48.5 mph. 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. Hi Daijudo. Saying doing 36 in a 30 zone. Would you like to stay up to date with all the latest advice, ratings, news and offers from The Car Expert? 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. However I know where the camera in question is. My wife got a ticket for doing 46mph in a 40mph in a downhill stretch of highway. Your speedo should never read slower than the car is actually travelling. Your IP address will be logged. If the odometer is off, the speedometer should likewise be off. The choice lies with the public.” (I.e. Some factory satnav systems will also use data from the car to integrate with the GPS signal to improve overall accuracy. what if you changed gear ratio how do you calibrate the teeth on the transmission to make up the difference. View the answer I have this problem too Subscribed to new answers . Are you suggesting that old cars should be exempt from speeding laws because their speedometers may no longer be accurate? The worst culprits for inaccuracy were the Nissan Juke, Toyota Kluger, Alfa Romeo MiTo and Jeep Wrangler (all 6km/h off). 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. 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. Ellensburg, WA 98926. But in fact they (police, speed cameras) allow yet another 2mph to 80 mph. 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. And I know for certain I was doing what my speedo said was 30mph. We have just had a speeding notice come through our door. 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. For example: If you drive up a 30 degrees hill and your sat-nav says 40mph you may be going closer to 50mph. 77 on the speedo is the real speed of 70MPH. 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. They then use some basic maths to extrapolate that rotation and determine how fast you are travelling. What system do police speed cameras (hand-held or in-car) use to determine a vehicle’s speed ? I also checked some GPS speed applications that car speedo shows less than GPS. Of the 60 vehicles tested, four – three Jeep Cherokees and an Audi A5 2.0 TFSI - came back with a perfect 100km/h reading, while a Mahindra Genio ute was next best with a 99km/h reading. 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? Satnav accuracy is determined by satellite signal quality and is unaffected by your car’s tyres. Hi Trevor. But the speedo shows 70mph when the satnav reports a speed of 65mph. Hi Connor, it shouldn’t make any difference, as the calculation to display the speed is the same for both analogue and digital speedometers. 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. Thx. The examiner took the sat nav reading and the dial reading so I’m really not sure which one would have been right? So yes, they both have the same ‘fudge factor’. I am tyring to find here but still no result. What could you advise? The shop said it could take an hour, and I don't want to spend $80 - $100 if there's no reason for it. Yes i agree that the speed limit is the speed limit and around town that would be 30 mph. The odometer shows the distance your vehicle has travelled, while the speedometer show how fast your vehicle is going. Then we should abide by it without question. I recently bought a 2012 Ford Focus from a local Ford dealer. I checked this in other cars and result is opposite, GPS showing less than car speedo. 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. 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 exclusive Drive test has shown 93 per cent of new car speedometers are inaccurate. 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. 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. Hi Neil. The biggest fluctuations in speed readings usually come from tyre wear, pressure and tread depth, as well as calibration of the speedo. As a general rule, luxury cars fared better in the testing than regular passenger cars – usually within 2km/h of the true speed. Many other drivers have reported the same thing over the years, and this situation is actually common to nearly every car on the market. 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. The speedometer must be accurate to within plus or minus 8 km/hr (5 mph) at a speed of 80 km/hr (50 mph). 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. Hi Rachel. Read about our Security Policy A vehicle's speedometer gives the driver an accurate estimation of the vehicle's speed. If the figures refer to the actual calibrated speed as on speed cameras (satnavs under perfect conditions of signal etc), roadside flashing light, etc 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. Surely it couldn’t be that difficult to bounce a tiny radar or sonar off the ground to measure real speed? 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. Have you noticed that your car speedometer sometimes reads faster than your satnav says? All of those wheel/tyre combinations are approved by Ford because they don’t change the overall rolling diameter significantly. I understand perfectly what Les was saying above re: travelling through roadworks. 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 … But car driver thinks you are speeding and then does an illegal move which is apply their brakes for NO reason. 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? Can this result in a speeding ticket? 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. If the circumference of the tyre is smaller then the wheel will have to rotate more times to cover the same distance so speed will appear higher. So I was wondering, how does this affect the speedo and odometer readings? This will be the last new Toyota that I buy. 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. I'm questioning the accuracy of either the speedomeder or that of the odometer. 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. 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 … This margin for error is taken into account in how the law is applied, and how manufacturers calibrate their car speedos. 13355 Lake City Way, N.E., Seattle, WA 98125. 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