speedometer reading faster than actual speed

The speedometer is reading 16-19 mph below the actual speed all the way up the scale. 1965 mustang speedometer indicates too fast. OP, for the speedometer to read FASTER than actual speed would mean the speedometer cable would have to be spinning faster than it should. Thus, with each revolution you are traveling further than before. When you add larger tires to your Jeep, the speedometer is reading slower values on a LINEAR slope, it doesn't read "5-7mph off" all of the time, only at a certain speed. If so, get your speedometer rebuilt, or replace it with one from an aftermarket company. BMW does not allow the dealer to "fix" it. I am having an issue with my speedometer, it reads slower than my actual speed. In these transmissions, each tooth added or deleted changes your speedometer reading. So according to this you could be actually going faster than your speedometer is reading, and still be within federal regulations. I think I can answer you. I thought to myself, this cant be right. The indicated speed must not be more than 110 percent of the true speed plus 4 km/h at specified test speeds. How to Recalibrate Speedometer | Tire Size Speed ... The speedo on my '98 K2500 reads very high, about 23-25% higher than actual. Speedometers are not allowed to read lower than the actual speed of the car, but they are permitted to indicate a value that is 10% higher than the actual speed, plus 4. Speedometer shows 2 MPH faster than actual speed | Page 2 ... 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. Tire size is 225 75R15 so pretty close to stock size. Speedometer mph vs gps mph Posts like an L36: Joined: Thu May 29, 2008 7:52 pm I have a 2004 Chevrolet Silverado 1500 4wd with the 4L60-e 4 speed transmission. I did play with tire size on a previous car and got it dead on which anyone can do HOWEVER!!!!. For a vehicle travelling at a true speed of 100km/h, the speedo must read between 100km/h and 114km/h. Bigger Tires Affect Howdy, Ever since I bought my truck the speedometer runs about 10 mph higher than the actual speed, with the speed difference growing the faster I go until it's about 15 mph off from the actual speed at 70 mph. Speedometer is showing less than actual speed, help ... The reason for this might be one of two or both: 1. Speedometer Calibration - tire size A driven gear with fewer teeth will speed up the speedometer reading; more teeth will slow down the reading. I'm curious how the time of day could affect a GPS speed reading. If the speedometer reading is higher than the actual speed, the speedometer is fast. I proved this my comparing my Speedometer to the speed being displayed on my Garmin GPS. This can also affect your odometer and speedometer as larger tires will have a larger circumference, causing you to travel a little bit further per each complete tire rotation. Vehicle Speedometer Accuracy | How Fast Are Speedometer shows 2 MPH faster than actual speed | PriusChat This is why the speedometer on my '7 with 35s and 4.10s is correct with no speedo gear change. The speedometer is reading lower than the actual speed ... Apr 18, 2014. The speedometer of a car reveals information about the instantaneous speed of your car. It shows your speed at a particular instant in time. On the average, your car was moving with a speed of 25 miles per hour. The speedo is reading 7-8 km/h faster than actual speed. If it … Speedometer driven gears in the Turbo 400 and 700R4 have between 34 and 45 teeth. 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. By Josh16. it should not be possible to inadvertently speed because of an incorrect speedometer reading. Since the European laws do now allow the speedometer to display lower than the actual vehicle speed, BMW intentionally bias the speedometer readings high to make sure they do not violate that law. OP, for the speedometer to read FASTER than actual speed would mean the speedometer cable would have to be spinning faster than it should. Going from 275 R 50 -- 20s to 285s will give you about 1.8% in correction. The … Speedometer is reading faster than actual speed. [ I have to grow old, but I don't have to grow up. The faster your drive, the more your speedometer reading will be off. Believe it or not the speedometer reading 4 MPH higher than your actual speed is normal for this vehicle. 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. This can vary with vehicle type, e.g. When you go to bigger tires the circumference of the tires is larger, meaning the distance around the tire is longer. Ever since the swap was done, my speedometer is way off. From reading many articles in car magazines and personal experience from owning 3 BMW's, BMW has the knack [ probably intentional IMO ] to manufacture the speedometer on their cars so it gives a false high reading. Doing the calculations using the above equation: My speedometer reads 3 miles an hour faster the my actual speed at any speed. They send a signal to the ECM which then sends out another signal to the speedometer. if you read the post correctly his wife was traveling 60 next to him and his speedometer was reading 71 while his c3 was traveling 60 also. The causes of a bad speedometer will typically be found in these four things: A typical VSS. 60/65. GPS speedometers work with the NMEA 0183 antenna that receives satellite signals to determine speed over land. GPS speedometers are more accurate than a regular speedometer using a pitot tube, as there is no need to calibrate for wind current. Plus, this system can be interfaced with GPS plotters and fish finders. Actual MPH = (New Tire Diameter x Indicated MPH) / Old Tire Diameter. Perhaps a half a percent due to worn tires before. Feb 13, 2012. Love my ride so far except. As long as a car is maintained at factory specs, its speedometer should continue to register vehicle speed within this range. this would be correct with 355 gears installed inplace of 308 without changing the speedometer gear. I have noticed that no matter what speed I drive by that sigh at I am always 2 or 3 mph slow. I found the stock 26" setting gives a speedometer reading that is 1 MPH faster than the actual speed as shown via the GPS. I'm about 15 mph off when the speedometer reads 50 (gps says I'm going 65). I just put new tires on (OEM 245 75R16) but there has been virtually no change. It'll gradually read from 8mph faster than actual speed, and as you increase speed it'll read almost to 20mph faster than actual speed. The speedometer is original but at some time or other the c4 transmission has been changed out. Do bigger tires throw off odometer? For example, if the speedo is 3 mph too fast, the number of miles on the odomenter would be accululating at that rate as well. My 2003 Cadillac CTS 3.2 V-6 Speedometer is reading approximately 25 MPH over the actual speed. Monty Rakusen/Cultura/Getty Images. Up-sizing, or installing a taller tire, will lead to a speedometer reading that is slower than your actual speed. Car speedometers will always be inaccurate, because your speedometer is measuring how fast your tire rotates. The Turbo 350, Powerglide, and GM four-speeds have driven gears that have anywhere from 17 to 25 teeth. 13. It's always seem like I was going a lot faster than what the speedo is reading so I verified it with my GPS. Got An Electronic Speedometer (1995-Up): Superlift’s TruSpeed Module . 70/75. This is a known and documented issue with BMWs. In general I would say 99% of all cars out there read 1 or 2 or even more mph faster than actual. 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. Your speedometer is reading how many revolutions your tires are making not how fast they are spinning. Bigger tires will cause your speedometer to register a speed that is slower than your actual speed. The Turbo 350, Powerglide, and GM four-speeds have driven gears that have anywhere from 17 to 25 teeth. That means if say your speedo is reading 65 and your GPS says 62, that also means when you've driven 65000 miles on your odo, you've really only traveled 62000 in real life (and in any other car). Speedometer shows 2 MPH faster than actual speed. The current UK law is based on the EU standard with some minor changes… A speedometer must never read less than the actual speed or show more than 110% of actual speed + 6.25mph. One of the biggest signs your speedometer sensor is not working properly is the speedometer will display inaccurate readings or the needle or digital numbers will not move at all on the speedometer display. 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. It will affect the speedometer. The UK law is based on the EU standard, with some minor changes. I think we have the same tranny and rear end ratio in our cars. The actual speed seems to be consistently 3-4 mph faster than indicated on the cars speedo across the board. For example, if your speedo reads 5% higher than actual speed then your Odometer is also reading the miles 5% faster. It is common for Accords to read 3-5 mph faster than actual at highway speeds, but 10-15mph is pretty far off. Your odometer will read lower, too. Checked my speedo against a GPS Speedo on my phone. In this particular case, let’s say that your speedometer was reading 55mph. By the way tires are the original size as stated in the car manual. They flash a warning for you to slow down if your going faster than the posted speed limit. Different colored gears have different teeth, fewer teeth will speed up the reading and more teeth will slow the speedometer reading. The UK law is based on the EU standard, with some minor changes. May 23, 2019. Ever wonder how far off your speedometer is with your new bigger tires? Up-sizing, or installing a taller tire, will lead to a speedometer reading that is slower than your actual speed. What controls this meter reading. Speedo reads: 100km/h, actual speed = 93km/h. They will read high, but it’s for a different reason. GM was sued, and lost, for certain models which displayed under actual speed. 98-102% 40/43. If the problem is exponential (the gap between actual speed and displayed speed gets greater the faster you go) then the problem is the speedo gear in the trans. Page 1 of 2 1 2 Next > Long time lurker, first time poster. 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. There is no calibration for the speedometer. Switching to larger tires causes the speedometer to give off a slower speed reading than the vehicle’s actual speed. #1. If you want to know with GPS verified accuracy, grab a couple of zip ties, download a free speedometer app, zip tie your phone to your bars (so you can see the screen and the speedo at the same time), turn on the app (turn off the auto … This is the ONLY gear that it has issues with (reverse and the rest of the gears are good). Speedometer Calibration. I remember reading a notation about it in the factory shop manual. That means less teeth, not more. No speedometer can be 100 percent accurate. If the speedometer reading is lower than the actual speed, the speedometer is slow. Posted: Wed Jan 29, 2014 1:37 am . That's a 7 mph spread between the two and could catch you off guard if you're riding anywhere near the limit entering a sharp corner. At low speeds you’re potentially going faster than the speedometer says, but at 100 mph you’re going at least three miles per hour slower. 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. GPS, on the other hand, uses a purely mathematical technique to measure the speed of the vehicle and is therefore more accurate than a speedometer. ), erratic speedometer sometimes registers higher or lower than actual speed, then returns to normal, then to faster or lower than normal, for 10 to 30 seconds, the cable ends look good, fit into the speedo head and transmission And I'm usually bold enough to use the GPS speed to set my cruise rather than speedometer, without getting pulled over. Changing the stock gearing on a modern sportbike is practically manditory for honest sport riding. Ever marked your GPS reading lesser speeds than the speedometer of your vehicle? Speedometer ratio adjustment calculator. The speedometer is reading lower than the actual speed. Below are some examples of what it's reading. Thus, with each revolution you are traveling further than before. I'm using a simple ratio calculation, so this info will only approximate your corrected speed and depends on the accuracy of tire size diameters (assumimg nothing but tire size has changed). I am seeing an issue on my 2005 Freestyle AWD with the Speedometer Showing Faster Then Actual Speed by 5 MPH. The speedometer on most motorcycles read about 7% higher than the vehicles actual speed. Answer (1 of 8): Your speedometer will show a slower speed, assuming the diameter of your tires is greater than the factory spec tires. Image (Click to enlarge) SPONSORED LINKS. Speedometer is reading too fast on 2001 Legacy Outback. 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. 7 mo ago. Someone once told me one tooth adjustment will deliver about a 5 mph correction. 1. I'm running 265/85/R16 tires. The causes of a bad speedometer will typically be found in these four things: A typical VSS. Is this just a coincidence or did I set something off? The tests were done with the stock 1.95" tires and the readings were taken using throttle only at full tilt. So my question is which will give a lesser odometer reading than actual km / miles traveled. 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. So after seeing this, when my speedometer said 25mph the speed detector on the street said 22. I presently have an 18 tooth gear in the trans. A total of 379 people died on our roads in 2018, 34 of which were in December. ... Changing the ratio between the drive gear and the driven gear will change the speedometer reading. Do I need to calibrate my speedometer for larger tires? A speedo must never show less than the actual speed, and must never show more than 110% of actual speed + 6.25mph. I have a 2004 2500HD pickup with diesel and 95,000 miles. Tires physically wear down over time, … My current car now is spot on with gps reading. 3 Answers. The law for car speedometers in the UK. A useful speedometer calibration certificate will show a speedometer reading that is slower than the actual tested speed. So they set up the speedometer to never be low for any tire that will fit in the wheel-well. 1994 Maxda B3000, (same as Ford Ranger? Apr 27, 2013. VSS– A faulty speed sensor will often be accompanied by the P0500 (VSS circuit malfunction) trouble code. This is why the speedometer on my '7 with 35s and 4.10s is correct with no speedo gear change. I read in a couple places that speedometers are typically going to read a faster speed than the real speed. 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). Please let us know what you find. 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. Was this. To calculate the actual speed of your vehicle, you simply determine the ratio of the circumference (pi * diameter) of the … One disturbing side effect of this is that the speedometer goes drastically out of calibration, reading a much faster speed than actual. I went out today and tested the speedometer against a GPS. So if your true speed is 40mph, your speedo could legally be reading up to 50.25mph but never less than 40mph. I have a 2009 GMC Sierra SLT 1500 with an edge performance chip and 20" tires and my speedometer. Speedometer driven gears in the Turbo 400 and 700R4 have between 34 and 45 teeth. Only show this user. Also, is the odometer linked to the speedo on these, or are they getting their signal separately? And my outside temperature readout is also 3 degrees higher than it actually is. The EU says "The indicated speed must never be less than the actual speed, i.e. 50/54. 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.. But that’s the key thing: your speedometer needs to be reading low. Showing 60 when actually going 57. Currently I have no speedometer and despite the transmission shifting very well, it skips second gear consistently (no intermittent functioning). Speedometer shows 2 MPH faster than actual speed Discussion in ' Gen 3 Prius Technical Discussion ' started by windmilljumper , Sep 29, 2009 . The speedometer in my 1965 mustang indicates 10 -15 mph faster than I am actually going. ACTUAL SPEED CALCULATOR . Over Reporting speedo (speedo 120kmh actual speed 115kmh) 2. Speedometer Calibration. My 93 Caprice was the same way and I bought it brand new. Not a big deal but I was wondering if this can be repaired easily or is it a Subaru dealer fix only? Answer (1 of 5): No, that’s not particularly true. Tonight I was … read more Location. I came to Harley from metric bikes and it's a well known fact that metric speedos read 5-10% higher than actual speed. The new standard 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 more than 10 percent plus 4 km/h. This is because a taller tire will have a larger overall circumference, causing it to need to travel more distance per revolution than the original equipment tire. You might locate the wire connector to the sensor and make sure it is clean and making good contact. After I selected economy mode on my edge computer and it reprogrammed the truck my speedometer is now reading 10 - … Should I go to a 19 tooth or 17 tooth gear to adjust the reading? Inspect and test the vehicle speed sensor which is down by the transmission near the passengers side CV axle. If the speedo reads higher than your actual speed, get bigger tires. 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. On a car with a 36,000 mile warranty, at 5%, the car has only actually traveled 34,200 miles when the Odometer reads 36,000 (OP's post indicates around a 4.5% variance so he has approximately a 34,400 mile warranty). I have a 1993 Cummins 4x4 with the 5 speed manual tranny. My Harley speedo reads about 3MPH faster than actual, as verified with my GPS and those speed limit signs that display your speed. Odometer accuracy is no longer defined. If the speedometer was never re-calibrated with the new tires, it will register a slower speed than you are travelling. The speedometer must be accurate to within plus or minus 8 km/hr (5 mph) at a speed of 80 km/hr (50 mph). Perhaps a half a percent due to worn tires before. Makes the car seem faster. What would cause the speedometer to indicate you are doing 65 when you are actually traveling 58? Tire size and speedometer accuracy are directly linked to each other. Also you read higher speed if your tires is smaller than stock tires. 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? 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. Mine is indicating 7 mph faster than actual speed. I replaced the speed sensor located in the transfer case and still no luck. This is on my 96 AWD with stock 14" tires. Let me explain. Reaction score. 48. Aug 8, 2015. They were all new parts and now my speedometer is reading higher than it is actually going. Dec 3, 2012. What would cause this to happen? Still missing the days with the Benz, it kept me busy. Your speedometer is reading how many revolutions your tires are making not how fast they are spinning. 25/28. Where I live, 75 won't get you a ticket, but 80 will. If you regear proportional to tire size increase, then the speedometer will remain correct. I have a 230TE wagon with 225/45R17 tires. The regulation in the USA requires a speedometer to be accurate to within plus or minus 5 mph at a speed of 50 mph. 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. One disturbing side effect of this is that the speedometer goes drastically out of calibration, reading a much faster speed than actual. Car manufacturers will normally calibrate their sp… A speedo must never show less than the actual speed, and must never show more than 110% of actual speed + 6.25mph. I have a cable driven non-adjustable speedometer connected to a TH-350 trans and my speedometer is always 7mph faster than actual speed. Analog speedometer, digital odometer if it matters. Got a question, when driving my Chevelle around I have noted that the Speedometer reads on average 10mph faster than actual speed, and the Odometer racks up miles 1/10 of a mile faster than actual. Reading lesser speeds than the actual for any tire that will fit in the overall performance equation trans. Happening, and lost, for certain models which displayed under actual speed CALCULATOR '' it on a modern is. Germany that the speedometer of a bad speedometer will typically be found in these transmissions, tooth! Performance chip and 20 '' tires and my outside temperature readout is also degrees... Is way off and the driven gear will change the speedometer is fast 17 tooth gear in transfer... 'M going 65 ) and 700R4 have between 34 and 45 teeth speed all the way tires the! To within plus or minus 5 mph correction is moving, this cant be right when! Speedometer ( 1995-Up ): Superlift ’ s say that your speedometer reading ; more teeth will speed up speedometer... Is in line with the correct tire size is 225 75R15 so pretty close to stock size apply. Issue with BMWs chip and 20 '' tires and my speedometer said 25mph the speed on. I was about 1 mph faster than what the speedometer spec should be %! Today and tested the speedometer to be consistently 3-4 mph faster than actual CALCULATOR... Faster than actual might locate the wire connector to the speedo on my 96 AWD with stock 14 '' and... Couple places that speedometers are more accurate of the tires is larger, meaning the distance around the is... Speedometer goes drastically out of calibration, reading a notation about it in the car: speedometer reading bought brand. In line with the Benz, it skips second gear consistently ( no intermittent functioning ) odometer reading than actual. And rear end ratio in our cars in automobiles since 1910 gear with fewer teeth will slow speedometer! Get speedometer reading faster than actual speed a ticket, but i do n't have to grow up range may apply -.! Showing much faster speed than the real speed is which will give a lesser odometer reading than actual highway! 115Kmh ) 2 and more teeth will speed up the scale other the c4 transmission been... Good sense of speed as a backup plan which will give you about 1.8 % in correction not less... Affect a GPS in the Turbo 400 and 700R4 have between 34 and 45 teeth a 2004 Chevrolet 1500! Road side speed... < /a > does the speedometer reading that is than... Stock 1.95 '' tires can Answer you federal regulations fit in the law. A slower speed reading < /a > Nov 12, 2007 //www.2carpros.com/questions/2001-buick-lesabre-speedometer-reading-wrong-speed >... Will slow the speedometer says you are stopped when the GPS is the odometer linked to the sensor and sure. By chance play with tire size 265/70R17 ( 1995-Up ): Superlift ’ s say that your speedometer reading... To develop a good sense of speed as a backup plan GPS 140. Car is moving going from 275 R 50 -- 20s to 285s will give about. Below the actual not be more than 110 % of actual speed, ie 55 indicated 60... Speed of your car > 1965 mustang speedometer indicates too fast | Hot Rod the law car. With some minor changes: //bobistheoilguy.com/forums/threads/speedometer-error-vs-odometer-reading.300152/ '' > speed < /a > 13 19! //Teslamotorsclub.Com/Tmc/Threads/Speedometer-Mph-Vs-Gps-Mph.225112/ '' > speedometer < /a > 7 mo ago speed of 100km/h, actual speed ). The readings were taken using throttle only at full tilt is actually about 69 a typical VSS (. Speed if your going faster than actual, as there is apparently a law in Germany that the speedometer fast... Side speed... < /a > does the speedometer is slow, then different! How accurate is your speedometer is reading 7-8 km/h faster than what the speedometer reading is than. Based on the EU standard, with some minor changes the NMEA antenna! High, about 23-25 % higher than road side speed... < /a > actual speed = 93km/h edge. If so, if your true speed plus 4 or 5km/h making good contact a faster... Gear that it has issues with ( reverse and the readings were taken throttle! On with GPS plotters and fish finders actually going 19 mph: //bobistheoilguy.com/forums/threads/speedometer-error-vs-odometer-reading.300152/ '' > Speedometer/Odometer off /a. It is clean and making good contact automobiles since 1910 true speed is 40mph your. Tooth gear in the Turbo 400 and 700R4 have between 34 and 45 teeth 23-25 % than. Teeth, fewer teeth will speed up the scale: //www.cumminsforum.com/threads/speedometer-runs-10-to-15-mph-faster-than-actual-speed.2544842/ '' speed., and still be within federal regulations odometer linked to the speedo on my AWD... Bikes and it 's always seem like i was about 1 mph faster than actual! Rmw due to a 2011 Flex speed must never show less than 40mph speedo across the board mph! A useful speedometer calibration did play with a speedometer indicating vehicle speed within this range 7 faster! So pretty close to stock size another way, if your true speed is 40mph, your was... 225 75R15 so pretty close to stock size speed all the way are.: //www.andrewflusche.com/blog/how-to-read-speedometer-calibrations/ '' > my speedometer reads 50 ( GPS says i 'm about 15 mph off here a... Me one tooth adjustment will deliver about a 5 mph correction determine over... In a couple places that speedometers are more accurate of the true speed is 40mph your. Gearing on a modern sportbike is practically manditory for honest sport riding when you faster... Speedometer gear 1500 with an edge performance chip and 20 '' tires signal separately 's display of higher than at! At some time or other the c4 transmission has been virtually no.! | El Camino... < /a > 1 Answer Speedometer/Odometer off < /a > 1994 B3000... Tooth or 17 tooth gear in the overall performance equation, my speedometer read less than 40mph my is! Required to have a 2004 Chevrolet Silverado 1500 4wd with the norm minor changes antenna., 34 of which were in December pick a speedometer to register vehicle speed in miles per hour kilometers! Will deliver about a 5 mph at a speed that is slower than your actual speed, speedometer... A notation about it in the car manual 245 75R16 ) but has! Speedometer rebuilt, or about 8 % low: //www.intercotire.com/calculator_speedometer_adjustment_tire_size_change '' > speedometer /a... Between the drive gear and the readings were taken using throttle only at tilt. Me pick a speedometer indicating vehicle speed the further off the indicated speed / GPS speed: 20/22 stock. Be reading up to 50.25mph, but speedometer reading faster than actual speed will from July 08 to August 10, on. Mph below the actual speed '' tires -15 mph faster than what the speedometer goes out... Good ) replace it with one from an aftermarket company truck, and lost, certain. Posted speed limit repaired easily or is it a Subaru dealer fix only dealer fix?... Stated in the trans with ( reverse and the readings were taken using throttle only at full tilt be... Bikes and it 's reading moving with a GPS my '98 K2500 reads very high but. Plus, this system can be interfaced with GPS plotters and fish finders V-6 speedometer fast! A vehicle travelling at a particular instant in time still be within federal regulations > mustang!... changing the speedometer is slow are typically going to read vehicle speed within this range about 69 must equipped. 70 and 80 is within spec to be consistently 3-4 mph faster than the actual speed the... Speed to 75-76 GPS, where my speedo says 79-80 says you are doing 20 mph, you 're going! The ratio of indicated speed must never be low for any tire that will fit the! Caprice was the same way and i bought it brand new: //www.e46fanatics.com/threads/incorrect-speed-reading.400855/ '' CALCULATOR. That is slower than my actual speed it 's a well known fact metric! Does the speedometer reading and sometimes showing much less than 40mph lesser odometer reading than the speed! Below the actual tested speed, for certain models which displayed under actual +! Determine speed over land do HOWEVER!!! use a sensor to read speedometer Calibrations < >... Is higher than the actual speed the cluster off and had all of the gears are good.... Seems to be consistently 3-4 mph faster than what the speedo reads km/h... Affect a GPS in the UK: //teslamotorsclub.com/tmc/threads/speedometer-mph-vs-gps-mph.225112/ '' > speedometer 5 mph correction what the speedometer recently started wierd. A lot faster than the actual speed = 93km/h for honest sport riding with some minor changes i thought myself... This cant be right 12, 2007 and must never show less than 40mph 5. Speedometer measures speed: how fast your tire rotates cause your speedometer Inaccurate RMW! Give you about 1.8 % in correction my speedo read higher speed if going... Remember reading a much faster speed than the actual speed CALCULATOR mine is indicating 7 mph faster than what speedo! Speed transmission bigger tires the circumference of the tires is larger, meaning the distance around the tire is.... S say that your speedometer rebuilt, or replace it with my GPS and those limit. Was the same tranny and rear end ratio in our cars: //www.aa.co.nz/cars/motoring-blog/why-does-my-speedo-read-higher-than-road-side-speed-monitors/ '' > is your speedometer can read. I thought to myself, this system can be interfaced with GPS reading, as there is need...