How accurate is your speedometer

rudi · 08-18-2009, 07:28 PM

A possible reason for the error is Nissan my have calibrated the speedo to suit the 19" rims and not the 18's. Does anyone know if the rolling diameter is different for both wheels?

davidyan · 08-18-2009, 10:31 PM

the GPS speedometers are usually pretty accurate unless you are accelerating hard or slowing down in which case, there is some lag in the calculation.

I had a portable Garmin and used it in 5 different cars (sometimes I drive my parent's cars) and it always seems like the car speedometer is about 1.5 - 2 mph faster than the car.

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08-18-2009, 07:28 PM	#1 (permalink)
rudi Enthusiast Member Join Date: Jun 2009 Location: Australia Posts: 306 Drives: 370Z Australian Spec Rep Power: 17	A possible reason for the error is Nissan my have calibrated the speedo to suit the 19" rims and not the 18's. Does anyone know if the rolling diameter is different for both wheels?

08-18-2009, 10:31 PM	#2 (permalink)
davidyan Base Member Join Date: Jun 2009 Location: CA Posts: 244 Drives: PG 370Z Sport 6MT Rep Power: 17	the GPS speedometers are usually pretty accurate unless you are accelerating hard or slowing down in which case, there is some lag in the calculation. I had a portable Garmin and used it in 5 different cars (sometimes I drive my parent's cars) and it always seems like the car speedometer is about 1.5 - 2 mph faster than the car.