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. If the speedometer reading is lower than the actual speed, the speedometer is slow. Question: What would be more accurate, my vehicle’s speedometer or a GPS I have on my dashboard? Ah, yes. For the vehicles in my family, this means +/- 8 km/h for my pickup and +/- 10 km/h for my wife's car. https://www.thecarexpert.co.uk/how-accurate-is-a-car-speedometer Lots of speedos tend to read fast, and the error gets greater as speed increases. - Car and Driver Magazine. 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. This a fairly straightforward exercise, but you will need a stopwatch (and luckily most smartphones have one built in) and a 5 to 10-mile stretch of highway where there are mile markers along the shoulder. First, does your vehicle have original specification wheels and tires? Ok so I drive a 2006 Pontiac Grand Prix. Therefore, 5 minutes and 15 seconds would be 5 + 15/60 minutes, or 5.25 minutes. That your reading of the speedometer was more accurate. So how do you know if your speedometer is accurate? Most speedometer from 1965 on use 1000. The car takes the recorded rotations, applies a healthy dose of mathematics and spits out a speed. Sometimes, it might require a little more work. I had read on a forum dedicated to that particular make of truck the speedometers usually read 5-7 kilometres slower that the actual speed. Your speedometer may or may not show a number. It always shows a slower speed than my speedometer by 3-4mph. In older cars a break in the cable that connects the transmission to the speedometer is the most common cause. I don't doubt that these drivers were telling me the truth. Reasons why your speedometer is inaccurate. I don't doubt that these drivers were telling me the truth. At speeds above about 90 km/h the allowable range for speed is 4% of the highest reading shown on the speedometer. If you know specific information about your vehicle (gear ratios, RPM, etc.) I've been doing a lot of highway driving lately and have noticed cars riding my … A good way to check the accuracy of your vehicle's speedometer is to use a GPS device that can display the speed. When I am going the same speed as everyone else it often reads around 90-100mph. Where better than average road users satisfy their curiosity. I do appreciate your time to read my hub and to share your point of view! How to test your speedometer There are two ways. Thank you John D. Wilson . That’s a priority because we don’t know of any police officer that will accept an inaccurate speedometer as a logical excuse for your 100 mph trips down the interstate. The best isn't necessarily 100% accurate, it's just the best we can do with what we have to work with. Speedometer gear has twenty teeth. This may explain why that State Trooper didn't pull you over for going 58 in a 45. Whether you have a digital or manual speedometer, if it's not displaying accurate information, it doesn't really help you. So, chances are if you are looking at 70mph on your car's speedometer, your actual speed is probably closer to 67mph. Answer: They both can be accurate and inaccurate. I asked Transport Canada what the standards were for speedometer accuracy. Gear Driven Speedometer Operation . Is my speedometer accurate? Car shop vs DIY: how much can Haynes save you? My sat nav generally indicates a road speed lower than that displayed on my car’s speedometer. No need for ECU convertors or pulse signal generators screwed onto your transmission. https://haynes.com/en-us/tips-tutorials/how-check-your-speedometer-accuracy Your speedo and your sat nav calculate speed in different ways. The other option is GPS; most receivers will tell you your speed to good accuracy. This makes me wonder, is there a way then to test the accuracy of my speedometer? . Calibrate your speedometer in less than a minute and you don’t even have to leave your driveway! The basic speed app is free but you can upgrade to get built-in maps and a head-up display. Off by 30%. Speed Tracker: GPS Speedometer. How to change your car’s engine oil and filter, How to clean salt and grime off the car after winter, Haynes shows you how on YouTube: Nissan Pathfinder, How to save money on car maintenance when you’re a student, 21 Nissan Versa videos added to the Haynes YouTube channel. Image credit: Pixabay. https://haynes.com/en-gb/tips-tutorials/how-check-your-speedometer-accuracy Q. Go to an interstate or any road with mile posts or mile markers. 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. You could use a GPS device or get an app for your phone that will measure distance over time. then use the Gear Ratio calculator, it's probably a little more accurate. Aftermarket speedos? 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. 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