1 Answer Speedometer is reading faster than actual speed I have a 2009 GMC Sierra SLT 1500 with an edge performance chip and 20 tires and my speedometer. After I selected economy mode on my edge computer and it reprogrammed the truck my speedometer is now reading 10 - 20 mph faster than actual SOURCE: Speedometer reads 15 to 30 mph than actual speed. Sound like the speed sensor is not working right. Located on the drivers side of trans where the speedometer cable plugs in to the speed sensor. One 10mm bolt with clip holds it to trans Since your driveshaft is now spinning faster, the car thinks it is going faster than it actually is so you have to put in a new speedometer gear with more teeth. You can pick these up on ebay as well as local ford dealerships. It is a little plastic gear about as big as your thumb Speedometer Reads Way Too Fast. Bought it about 3 1/2 years ago and at the time it was reading exactly 10mph faster than actual speed. 25k later it now reads 14-15 mph fast at anywhere more than 40mph. I have no knowledge about the history of the car but it's very clean 2 owners never wrecked, original wheels and correct tires
Reaction score. 48. Location. NH. Apr 18, 2014. #1. The speedo on my '98 K2500 reads very high, about 23-25% higher than actual. 45 indicated is actually about 36, 85 indicated is actually about 69. Any ideas on why this is happening, and a fix? Also, is the odometer linked to the speedo on these, or are they getting their signal separately I am seeing an issue on my 2005 Freestyle AWD with the Speedometer Showing Faster Then Actual Speed by 5 MPH. I proved this my comparing my Speedometer to the speed being displayed on my Garmin GPS. At 50 I was about 1 mph faster than the speedo was reading. Drove an 06 LTD FWD from July 08 to August 10, moved on to a 2011 Flex. Top. A malfunctioning speedometer sensor can also cause a speedometer to act erratically, fluctuating the reading from one speed to another; even though in reality you're not speeding up or slowing down
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. 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 Check your odometer against a few mile markers and/or a GPS unit. The speedometer in my Buick shows 30% - 33% faster than actual speed The odometer is dead nuts accurate, though A speedometer rebuild is in orde I have a 2004 2500HD pickup with diesel and 95,000 miles. The speedometer recently started acting wierd, sometimes showing much less than actual speed and sometimes showing much faster. Tonight I was read mor On the high side, it's allowed to read up to 10% above the actual speed plus four or six kilometers per hour, depending on the type of vehicle. Compare this chart to the first one. The most a.. Long time lurker, first time poster. I am having an issue with my speedometer, it reads slower than my actual speed. I sent the cluster off and had all of the motors repaired and calibrated with the correct tire size 265/70R17. I replaced the speed sensor located in the transfer case and still no luck. Below are some examples of what it's reading
Back to the basics, if your speedometer is indicating too slow for a given roadspeed then you have to turn it faster. That means less teeth, not more. Take the ratio of indicated speed vs actual speed, ie 55 indicated / 60 actual = 0.916, or about 8% low I have tried al different ways to check actual speed and the best way is to find a speed check point on the freeway and set the speed at exactly 60 mph for 5 miles and time it, you should do 5 miles in 5 minutes, if it is off then the speed sensor will need to be set up or down depending on your results, if too slow it needs to be increased, if too fast it need to be decreased Car manufactures usually calibrate speedometers to show a speed that is a little higher than the actual speed, to give drivers some margin for error. Federal law allows factory speedometers to read 10% higher or lower than the actual speed (49 CFR 393.82). https://www.law.cornell.edu/cfr/text/49/393.82 Speedometers can show the wrong speed 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. Also you read higher speed if your tires is smaller than stock tires Ever since the swap was done, my speedometer is way off. 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. I'm assuming this is because one of the rear ends had the tow package and one did not
If the speedometer reading is higher than the actual speed, the speedometer is fast. If the speedometer reading is lower than the actual speed, the speedometer is slow. In this particular case, let's say that your speedometer was reading 55mph. Doing the calculations using the above equation: Actual MPH = 60 / 5.25 x 5 Just ask BMW. In 2019 the BMW X1's Automatic Emergency Braking (AEB) system - a system intended to automatically apply emergency braking and attempt to avoid a pedestrian in its path - was put through a series of tests by the Insurance Institute o.. A speedo must never show less than the actual speed, and must never show more than 110% of actual speed + 6.25mph. So if your true speed is 40mph, your speedo could legally be reading up to 50.25mph but never less than 40mph
I found the stock 26 setting gives a speedometer reading that is 1 MPH faster than the actual speed as shown via the GPS. To put it another way, if the speedometer says you are doing 20 MPH, you're actually going 19 MPH. The tests were done with the stock 1.95 tires and the readings were taken using throttle only at full tilt 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. So, under those rules, a. 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. Odometer accuracy is no longer defined If it has, say 22 teeth now, you'd need 22 x .15 = 3.3 more teeth on the gear, so you'd get a 25 tooth gear. If they make one. otherwise you get to find a drive gear (on the output shaft) with fewer teeth. Or get an adapter box made. Or if it's always off by that many mph, and the odometer works right, just take the needle off and move it 8-10.
Bigger tires will cause your speedometer to register a speed that is slower than your actual speed. 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 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. Also you read higher speed if your tires is smaller than stock tires. Still missing the days with the Benz, it kept me busy I have a cable driven non-adjustable speedometer connected to a TH-350 trans and my speedometer is always 7mph faster than actual speed. I presently have an 18 tooth gear in the trans. Should I go to a 19 tooth or 17 tooth gear to adjust the reading? Someone once told me one tooth adjustment will deliver about a 5 mph correction. Thanks for the. Mine is indicating 7 mph faster than actual speed. 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. This is on my 96 AWD with stock 14 tires. Last edited by Navyguns; 07-16-2010 at 08:49 PM RedneckRam. 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. I've gotten used to it to the point I know about what speed I'm going based on the wrong speeds, but it becomes an issue when a.
The speedometer must be accurate to within plus or minus 8 km/hr (5 mph) at a speed of 80 km/hr (50 mph). So according to this you could be actually going faster than your speedometer is reading, and still be within federal regulations. HOWEVER, regulations on this in the UK say that vehicles absolutely cannot allow you to go faster than your. Correct, I am experiencing the speedometer reading faster than the actual ground speed. My door jam says the tires should be 265/75r16, and that's what I'm running. If your truck has the factory tire size on it, the speedometer should be close unless someone has changed the axle ratio
Speedometer reading maximum speed. For this vehicle and these particular tires, the equation relating the actual speed (y) to the displayed speed (x) is: Y= 1.0264 X - 5.1610, with r^2 = 0. That's true if the odometer gets the mileage ticks from the same sensor that reads the speed. Speedometers can vary quite a few percent from just the wear on the tires from new tires to tires needing replacement at the recommended minimum tread de.. I have a 1993 Cummins 4x4 with the 5 speed manual tranny. It's always seem like I was going a lot faster than what the speedo is reading so I verified it with my GPS. I'm about 15 mph off when the speedometer reads 50 (gps says I'm going 65). I'm running 265/85/R16 tires. Is there any way to.. After driving through a speed detector that displayed my driving speed through a neighborhood it appears that my speedometer reads 2-3mph faster than my actual speed while going 30mph or less. Let me explain. So after seeing this, when my speedometer said 25mph the speed detector on the street said 22. I thought to myself, this cant be right 07 G35 Sporter wrote:Hello forum Just registered since I am a brand new G owner. Love my ride so far except. The speedo is reading 7-8 km/h faster than actual speed
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. A useful speedometer calibration certificate will show a speedometer reading that is slower than the actual tested speed The speedometer on most motorcycles read about 7% higher than the vehicles actual speed. I.E. Speedo reads: 100km/h, actual speed = 93km/h. 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-lock screen function. May 20, 2013. #3. whitedog said: They have been doing this for many years. The speedometer reads faster than actual, but the odometer will be right on if you are running the stock size tires. The computer gets one signal and tells the odometer one thing and the speedometer another thing CTS. Joined Jan 27, 2009. ·. 137 Posts. Discussion Starter · #1 · Apr 27, 2013. My 2003 Cadillac CTS 3.2 V-6 Speedometer is reading approximately 25 MPH over the actual speed. What would cause this to happen
This thread will provide detailed instructions for those with a 1992-1998 Gm pickup truck, with either 2wd or 4wd who wish to recalibrate there VSSB (vehicle speed sensor Buffer). This should be done when gearing ratio or tire sizes are changed to keep both your speedometer and Odometer correct. A few early precautions How does changing tire diameter affect the speedometer reading? A smaller diameter tire causes the speedometer to read faster than actual speed and more than actual mileage on the odometer. The sending unit in a typical fuel gauge uses which of these devices? Float The corrective equation is: (speedometer reading / actual speed) X driven gear teeth = new driven gear tooth count. 60/50=1.2. 1.2 X 19 =22.8 , so you would need a 23 th gear, which IIRC is not made. Try the 22, it should be close enough. B 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. A total of 379 people died on our roads in 2018, 34 of which were in December The legal standard is anywhere between actual speed and plus 10%. My TVR reads less than 1mph over with fresh new tyres and 1-2mph over with older ones at speeds between 30-100
While traveling at a GPS verified speed of about 80 to 81 miles per hour, you can see the car's speedometer is reading 87 miles per hour, significantly higher than the actual speed. This is a result of changing the final drive gearing in my S2000, but you could also have a speedometer reading incorrectly from putting on different tires or. That led to police in states such as Queensland setting speed cameras to trigger at 11km/h over the speed limit. However, since July 2006, all new vehicles except mopeds, had to show a conservative reading, only, up to 10%. That puts us in line with most other counties and means the indicated speed is always faster than your bike's actual speed Bigger tires=bigger around=faster actual speed than your speedometer In my case, the truck is going 12% further and faster than it realizes. That means that a displayed 15mpg is actually 15*1.12= 16.8mpg actual Actual MPH = (New Tire Diameter x Indicated MPH) / Old Tire Diameter. Got An Electronic Speedometer (1995-Up): Superlift's TruSpeed Module . Newer electronic speedometers use a sensor to read vehicle speed rather than a mechanical cable. This speed signal is a big factor in the overall performance equation i think they alter your ratio by .75. this means that at walking speed reading 24 mph it will no read around 18 mph. subtract 4 mph for walking speed to get 14 mph. each gear changes mph by around 3 - 4 mph so install a cable gear that is 4 teeth smaller than your current one and you will be very close.
258 Posts. #15 · Dec 3, 2012. I came to Harley from metric bikes and it's a well known fact that metric speedos read 5-10% higher than actual speed. My Harley speedo reads about 3MPH faster than actual, as verified with my GPS and those speed limit signs that display your speed speedometer reading in Scanner too high. I have researched but cant find a similar issue to mine. Here's the situation, C5 corvette LS1 with PCM and DBW in a RX7, T56 from the corvette converted into Fbody type, with a T56 Electronic Speed Sensor for a 93-2002 Camaro / Firebird. The car starts fine, drives fine, etc
The problem with a speedometer reading inaccuratly is that the number of miles on the odometer would be directly affected as well. 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. This will affect the length of your warranty (it would run out faster) My 07's speedometer is reading about 30 mph faster than the actual speed. I'm calling the dealer tomorrow but was wondering if this is a common occurence or a sign of bigger issues Any whos the problem is that my speedometer is way out of calibration. It reads 15 MPH faster than I am traveling. This would not be a big problem except now the 98 MPH limit is less than 85 mph. In Pa where I am right now, again no big deal. But I plan to go home to New Mexico soon where the speed limit is 75 MPH
Speedometer reading at least 10% faster than actual speed. Brought car back to the dealer explaining the inaccuracy, was told verbally speedometers are gauges not meters and can only be designed. What are common reasons my Dodge Journey has a speedometer that doesn't work? While there are a variety of reasons your Dodge Journey speedometer is not working, the most common 3 are the vehicle speed sensor (VSS), a faulty speedometer, or an electrical issue Up-sizing, or installing a taller tire, will lead to a speedometer reading that is slower than your actual speed. This is because a taller tire will have a larger overall circumference, which will cause it to travel more distance per revolution than the original equipment tire A speedometer must never read less than the actual speed or show more than 110% of actual speed + 6.25mph. So, if your true speed is 40mph, your speedometer can legally read up to 50.25mph, but never less than 40mph. 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. But that's the key thing: your speedometer needs to be reading low. If your speedometer is reading higher than the actual speed of the vehicle-so let's say that at 85 mph for the dynamometer your speedometer was reading 88-that would mean that you're reading 3 miles higher than the speed that you're charged with, which would mean.
. There is no calibration for the speedometer. You might locate the wire connector to the sensor and make sure it is clean and making good contact. It is common for Accords to read 3-5 mph faster than actual at highway speeds, but 10-15mph is pretty far off 2009 - 2014 Ford F150 - Speedometer reading too fast... - Hey guys. I have a 2010 Harley Davidson model and I upgraded my tires from 275/45r22 to 285/45r22. I took it to the dealer to get the speedometer calibrated. Well its still reading 8 mph fast and they told me they can't get it any closer... Any ideas on what to..
The speedometer reading will be related to the axle RPM based on the expected tire diameter. my speedometer reports a slower speed than actual. As you decrease tire size, you're increasing reported speed relative to actual. the GPS is 4 MPH faster then Speedo. Shy of asking a LEO to check me Radar who knows. I am not worried . Save. How does changing the size of the tires affect the speedometer reading? A smaller-diameter tire causes the speedometer to read faster than actual speed and more than actual mileage on the odometer. normal oil pressure runs between. 10 and 60 PSI. normal oil temperature ranges between . 1999-2013 Silverado & Sierra 1500. speedometer reading high. Sign up for FREE! Become a GM-Trucks.com Member Today! In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs
I know the speedometer is not very accurate, giving a much faster reading than actual speed. Does anyone know to what degree the stock speedometer is off ( I run in Km/h if that makes a difference)? While on the topic, I have read where some motorcyclist have mounted bicycle computers which can be calibrated for tire diameter or circumference. Its the module right by driverside front tire. Somehow the calibration was off between parts truck and mine. Both rear speed sensors were reading different values than front. Front was reading twice as fast as rear and truck had a fit and after few minutes of driving all bells and dingers went off and speedo quit. Dealer said replace cluster . #15 · Dec 3, 2012. I came to Harley from metric bikes and it's a well known fact that metric speedos read 5-10% higher than actual speed. My Harley speedo reads about 3MPH faster than actual, as verified with my GPS and those speed limit signs that display your speed ACTUAL SPEED CALCULATOR . Speedometer ratio adjustment calculator. Ever wonder how far off your speedometer is with your new bigger tires? 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) You may be driving faster, or slower, than you think you are. read no more than 1.5 mph higher or lower than your actual speed, Edmunds explains. this reading to your car speedometer.
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. The speedometer on my 2009 Tacoma reads faster than the actual speed. According to the multiple radar sites displayed near construction zones and according to GPS my Tacoma shows 45 MPH on the speedometer but the actual speed is 43 MPH and at 70 MPH on the speedometer the actual speed is 67 MPH . The reading from the scan is a bit lower than the speedometer (e.g. When the speedometer reads 70, the scan reading is 65, and the GPS speed indicates 55 - the latter confirmed by an accompanying vehicle. The odometer is off by the same amount - about 25
The regulation in the USA requires a speedometer to be accurate to within plus or minus 5 mph at a speed of 50 mph. Toyota's display of higher than actual is in line with the norm. GM was sued, and lost, for certain models which displayed under actual speed. Is the odometer actually coupled with the speedometer? It might be a separate calculation The size of the tire will still change the rotational speed of the wheel. The sensor will still be in the same location, but the time it'll take to complete a revolution should slow down. If the bike in stock configuration bumps up the speed reading, then slowing the rotation with a larger wheel/tire combo will be closer to the actual speed . Likewise, a smaller tire on a low-rider, for instance, will have to spin faster than a stock one to maintain the same speed, and therefore will cause the speedometer to read faster than the actual rate traveled
Instrument Panel problem of the 2007 Volkswagen Jetta 2. Speedometer reading at least 10% faster than actual speed. 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 At a minimum you will need know exactly how many MPH at a given speed (say 55 MPH) your speedometer is off and the number of teeth on the driven gear. If the speed difference is too great to change with the driven gears available, you will have to change the drive gear on the output shaft of the trans (requires removing the tail housing) Actual first words from the surface of the moon Early Fox: 5.0L HO SEFI conversion, 5-speed, 8.8 w/3.27:1 TL, full dual exhaust 1968 coupe - Ordered 12.15.67 Delivered 2.1.68: 8T01T, 65C, 289 conversion, hanger quee The speedometer reads around 10mph lower than what I'm actually going and the Tachometer is reading about 500 rpm lower than the engine is running. As far as the speedometer is concerned there seems to be nothing wrong with the speed sensor and my wheels/tires are stock