I sent the cluster off and had all of the motors repaired and calibrated with the correct tire size 265/70R17. The … What would cause the speedometer to indicate you are doing 65 when you are actually traveling 58? When the GPS reads 140 km/h, the speedo reads 145 km/h. As long as a car is maintained at factory specs, its speedometer should continue to register vehicle speed within this range. 25/28. I recall reading an article on C&D, the test result of speedometer accuracy shows all cars read faster than their actual speed with Bimmer being the extreme, read almost 10% faster. Speedometer driven gears in the Turbo 400 and 700R4 have between 34 and 45 teeth. Speedometer is reading too fast on 2001 Legacy Outback. Should I go to a 19 tooth or 17 tooth gear to adjust the reading? The causes of a bad speedometer will typically be found in these four things: A typical VSS. Car manufacturers will normally calibrate their sp… So, if your true speed is 40mph, your speedometer can legally read up to 50.25mph, but never less than 40mph. I read in a couple places that speedometers are typically going to read a faster speed than the real speed. Many jurisdictions place strict limits on speedometer accuracy - but the range is not symmetric typically the legal range for the speedometer display is 100-110% of actual speed. 1 Answer. Ever marked your GPS reading lesser speeds than the speedometer of your vehicle? I'm about 15 mph off when the speedometer reads 50 (gps says I'm going 65). Posts like an L36: Joined: Thu May 29, 2008 7:52 pm A speedo must never show less than the actual speed, and must never show more than 110% of actual speed + 6.25mph. It's always seem like I was going a lot faster than what the speedo is reading so I verified it with my GPS. Perhaps a half a percent due to worn tires before. The causes of a bad speedometer will typically be found in these four things: A typical VSS. The speedometer is original but at some time or other the c4 transmission has been changed out. I've repeated the tests using a dash cam with GPS speed so you can observe the actual speed and the actual speedometer reading and clearly see they are way way off. The speedometer is reading lower than the actual speed. I have a 1993 Cummins 4x4 with the 5 speed manual tranny. Apr 27, 2013. Up-sizing, or installing a taller tire, will lead to a speedometer reading that is slower than your actual speed. Only show this user. European law (ECE-R39) says speedometers cannot show speeds less than the actual speed, and they must never show more than the 110 per cent of actual speed plus 4 km/h. I presently have an 18 tooth gear in the trans. I have been driving past a construction area for the past week that has one of those radar stations with a display that shows your speed. The speed offset was Not a constant. They will read high, but it’s for a different reason. Ever since the swap was done, my speedometer is way off. Speedometer Calibration. Feb 13, 2012. 98-102% Not a big deal but I was wondering if this can be repaired easily or is it a Subaru dealer fix only? The UK law is based on the EU standard, with some minor changes. My current car now is spot on with gps reading. The law for car speedometers in the UK. it should not be possible to inadvertently speed because of an incorrect speedometer reading. Speedometer is reading faster than actual speed. if a particular vehicle is required to have a calibrated speedometer, then a different range may apply - e.g. Do bigger tires throw off odometer? Let me explain. Brought car back to the dealer explaining the inaccuracy, was told verbally speedometers are gauges not meters and can only be designed to guess the actual speed, they cannot report actual speeds. Speedometer Calibration. No speedometer can be 100 percent accurate. Got An Electronic Speedometer (1995-Up): Superlift’s TruSpeed Module . The standards for car manufacturers, and the effect of wheels and tyres or tyre pressures all mean that each car’s speedometer reading will be different, so while you may think another vehicle is travelling slower than the speed limit that may not actually be the case. Ever wonder how far off your speedometer is with your new bigger tires? This can vary with vehicle type, e.g. Newer electronic speedometers use a sensor to read vehicle speed rather than a mechanical cable. ACTUAL SPEED CALCULATOR . Tonight I was … read more There is no calibration for the speedometer. If my speedometer says I'm going faster than I really am does that mean my odometer is registering more miles than I'm really driving? It combines this data to send the speed reading to the instrument cluster. European law (ECE-R39) says speedometers cannot show speeds less than the actual speed, and they must never show more than the 110 per cent of actual speed plus 4 km/h. This is why the speedometer on my '7 with 35s and 4.10s is correct with no speedo gear change. Speedometer reporting faster than actual speed So over the weekend my wife, brother-in-law, and I were sitting around talking and all came to the same conclusion that our speedo's were off, saying we were going faster than we actually are. Changing the stock gearing on a modern sportbike is practically manditory for honest sport riding. Someone once told me one tooth adjustment will deliver about a 5 mph correction. I swapped the rear axle in my '93 RMW due to a bad pinion bearing. It combines this data to send the speed reading to the instrument cluster. One disturbing side effect of this is that the speedometer goes drastically out of calibration, reading a much faster speed than actual. Best to develop a good sense of speed as a backup plan. Thus, with each revolution you are traveling further than before. A car speedometer measures speed: how fast the car is moving. Speedometers measure speed in miles per hour or kilometers per hour. Some gauges display both readings. Speedometers have been standard equipment in automobiles since 1910. The speedometer must be accurate to within plus or minus 8 km/hr (5 mph) at a speed of 80 km/hr (50 mph). The speedometer spec should be -0/+10%, plus 4 or 5km/h. Each bus, truck, and truck-tractor must be equipped with a speedometer indicating vehicle speed in miles per hour and/or kilometers per hour. The speedometer must be accurate to within plus or minus 8 km/hr (5 mph) at a speed of 80 km/hr (50 mph). I believe the 195/60R15 (863rev/mile) tires turn more than 185/65R15 (855rev/mile) at the same speed, therefore the speedometer reading with 195/60R15 is higher than with 185/65R15. May 23, 2019. I remember reading a notation about it in the factory shop manual. Doing the calculations using the above equation: the drivetrain would be spinning faster than the actual movement of the car. 3 Answers. Location. My current speedometer gears are green-drive, 9-tooth, and red-driven, 21 tooth. Mine is indicating 7 mph faster than actual speed. Different colored gears have different teeth, fewer teeth will speed up the reading and more teeth will slow the speedometer reading. I replaced the speed sensor located in the transfer case and still no luck. For example, if your speedometer says 35 miles per hour on 20-inch diameter tires, changing to 23-inch diameter tires will make your true speed 40.25 mph, even though your speedometer will still show 35 mph. With my L8 ABS, at our speed limit, which is 100 kph, I seem to blend in with most other traffic or maybe I'm even a tad faster, but all speedo's will indicate slightly faster than the real speed for reasons already mentioned a few post up from here.. Speedometer ratio adjustment calculator. A driven gear with fewer teeth will speed up the speedometer reading; more teeth will slow down the reading. I came to Harley from metric bikes and it's a well known fact that metric speedos read 5-10% higher than actual speed. Inspect and test the vehicle speed sensor which is down by the transmission near the passengers side CV axle. If the speedometer shows a speed higher than the tested speed, then the certificate is actually harmful to a speeding case, since the driver had reason to believe the vehicle was traveling faster than the actual speed. Long time lurker, first time poster. VSS– A faulty speed sensor will often be accompanied by the P0500 (VSS circuit malfunction) trouble code. In other words, if it reads 50mph, you won’t be doing more than 50mph but it’s possible you might actually only be travelling at 40mph. In these transmissions, each tooth added or deleted changes your speedometer reading. Bigger tires will cause your speedometer to register a speed that is slower than your actual speed. Aug 8, 2015. I just put new tires on (OEM 245 75R16) but there has been virtually no change. It will affect the speedometer. My vehicle is a 2004 Jeep Grand Cherokee Limited, with the 4.7L, V8, SOHC, 16V engine, and has the "All-The-Time 4WD" transmission. Back to the basics, if your speedometer is indicating too slow for a given roadspeed then you have to turn it faster. I hooked up a real time code reader to it and it shows vehicle speed to be 65 when the speedometer is pointing at 72. Tires physically wear down over time, … I went out today and tested the speedometer against a GPS. I just put new tires on (OEM 245 75R16) but there has been virtually no change. 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