John D Wilson from Earth on November 22, 2011: Hi Au fait. On the occasions I use my smartphone as a sat nav, I get a readout of the speed of the car on the screen. I know that people tend to speed up sometimes when a fast motorcycle is present, but this seems a little faster than normal. A good way to check the accuracy of your vehicle's speedometer is to use a GPS device that can display the speed. Is there some way I can check either my speed or the officer's … My Speedometer Is Off, How Do I Figure Out What My Actual Speed Is There was one of those highway department signs that said “your speed is”. So, gathering a fat mug of coffee for a late-night adventure (which became wee morning hours), I mapped out the plan of Throw in some tire wear, improper tire inflation, a change of tires and wheels or even just a replacement tire of the same size classification and you can change this reading even more. Lots of speedos tend to read fast, and the error gets greater as speed increases. Drive exactly 60 mph until you reach the next marker while timing it with a clock with a second hand or with a stop watch (best to have a partner do this for safety). So, chances are if you are looking at 70mph on your car's speedometer, your actual speed is probably closer to 67mph. I don't doubt that these drivers were telling me the truth. If the car is modern with an electronicly controlled speedometer it may be able to be adjusted at the dealer. In this particular case, let’s say that your speedometer was reading 55 mph. If you like to travel at 10 over because the cops don't stop anyone for 10 over, you are easily risking being 20 or more over without knowing it. While it is possible to do this yourself, it might be a good idea to enlist an assistant so you can drive without distractions. The trouble is that for virtually all of these incidents, I knew how accurate my speed measuring device was but these drivers had no idea whether their speedometer was accurate or not. Many drivers have reported this exact phenomenon in recent years, as satnav has become more prevalent in cars, and the situation is actually common to nearly every car on the market. If the speedometer reading is higher than the actual speed, the speedometer is fast. It only reads 35 mph when I am actually going 50 mph. You may be well advised to stick to the number on your speedometer that matches the posted limit. If the speedometer reading is lower than the actual speed, the speedometer is slow. Speed Tracker: GPS Speedometer. This means that at a true speed of 100 kilometres per hour the speedo can’t be displaying 99, or under, but it could be displaying up to 114. Calibrate your speedometer in less than a minute and you don’t even have to leave your driveway! I've been doing a lot of highway driving lately and have noticed cars riding my … Often, the best way to do this is to have your speedometer calibrated by a qualified professional, followed by a certificate from that professional that verifies the accuracy of your speedometer. You could use a GPS device or get an app for your phone that will measure distance over time. Manufacturers are guided by a standard set by the Society of Automotive Engineers known as J1226 Electric Speedometer Specification. When in my car traffic is often going around 80 mph, but when I am on my bike I tend to go the same speed as traffic or faster. The basic speed app is free but you can upgrade to get built-in maps and a head-up display. Along with the traditional functions as the speed measurement and the classical representations of the round speedometer in the car, this app will also become your trip computer, counting on how many miles you have driven in the current trip, how many hours … If the number is higher than 1.0, your speedometer is reading low and you’re going faster than you think. I recently installed wheels and tires on my pickup with a larger circumference and used a GPS to check the speed reading on the speedometer. If the final number is 1.0 congratulations, your speedometer is accurate. https://haynes.com/en-us/tips-tutorials/how-check-your-speedometer-accuracy Businesses know that proximity makes a difference, and that’s why some, like Netflix, use a content delivery network to bring the data closer to you. 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. I usually go with the flow of traffic which is usually right around the speed limit. "If my sat nav shows I'm going 4/5 miles an hour slower than my car speedometer says, which do I believe?" This makes me wonder, is there a way then to test the accuracy of my speedometer? This app is known to be the best one among all the speedometer apps for iOS. Look a t the bottom of the speedometer face for the numbers 940, 960, 1000, or 1020. For example, if your speedo says you’re going 100km/h in a car built this year, you will be travelling somewhere between 87.3km/h and 100km/h depending on how your manufacturer programs the speedometer. When taken out on a road test, the app accurately reflected the speed on my vehicle’s speedometer. . Sky Drive is the world’s most accurate electronic speedometer sending unit. How to check the accuracy of your speedometer, Imposing a 30 km/h Speed Limit in Residential Areas. Should I Fix My Speedometer Myself? Many things can throw off your speed or the way your speedometer reads it. My sat nav generally indicates a road speed lower than that displayed on my car’s speedometer. https://haynes.com/en-gb/tips-tutorials/how-check-your-speedometer-accuracy . These numbers are the number of revolutions the speedometer cable must turn in one mile of travel. To determine your actual speed, you divide the number of minutes it takes you to drive the distance into 60 (the number of minutes in an hour) and then multiply this figure by the distance you traveled. Forum discussion: This may sound silly, but how do you determine if your speedometer is accurate? This could be due to two reasons. If you are experiencing inaccuracies in relation to your vehicle speedometer, you should contact the original vehicle manufacturer.". You may now plug this figure into the following equation: Actual MPH = 60 / minutes x number of miles traveled. What Does The H And The C Stand For Which Is Located Next To The Speedometer This is hard to explain but i’ll try, i have noticed that there’s a 3 circle next to the speedometer all the way at the right, which has the How Do I Juice Up My Car I am trying to juice up my 95′ Impala SS and I only know a little about cars. https://www.thecarexpert.co.uk/how-accurate-is-a-car-speedometer You can use nearly any freeway, or limited access expressway, or even a less traveled state or county road. There were no other cars around to estimate which speed is correct, but I have never had a problem before. When I am going the same speed as everyone else it often reads around 90-100mph. That your reading of the speedometer was more accurate. Or more that you would may want to operate car without a working speedometer limit. Had a problem before to assist my position, my view was they behind... 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