Quote:
Originally Posted by ovekvam
It pretty much only depends on tyre diameter. If you select lower tyres than the original size, or if you wear them well down, the car will guess the speed is higher than it really is. If you have oversize tyres, it will guess too low.
When I tested 0-100 with OBD speed data, I compared to the GPS speed from the phone I used, and they agreed about the speed.
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Well i use the same stock tyres. And a 1 hz gps device is not quite as accurate as a 10 hz gps logger. Especially not in acceleration tests. Your phone gps will only refresh 1 time per second while the gps logger will do so 10 times per second.
But if you are happy with it good for you
i started with obd reader then bought xgps pro and used that with racechrono and ended up with a racelogic performance box anyways. Its very reliable if you want accurate data.