: New problem.. Speedmeter not accurate !!



cts-v2009
09-27-09, 02:24 PM
Hi all

Today i was driving my V ( 160 km-h ) and my friends was driving 155 KM-H ( M5 ) and other friend has XFR was 155 km -h ... we were at same level !!! ... so thats mean my V speedmeter has an error of 5km-h !!!

Any one else noticed that there speed meter not aacurate !!!

4gear70
09-27-09, 02:43 PM
Hi all

Today i was driving my V ( 160 km-h ) and my friends was driving 155 KM-H ( M5 ) and other friend has XFR was 155 km -h ... we were at same level !!! ... so thats mean my V speedmeter has an error of 5km-h !!!

Any one else noticed that there speed meter not aacurate !!!

Do either you or your friends have different diameter wheels than stock?

cts-v2009
09-27-09, 03:03 PM
no ... all our tires are stock tires ...

Today i hand my car to service to fix this problem

nynd
09-27-09, 03:10 PM
Mine is dead accurate... tested using those school displays which says... "YOU MUST BE IN A V"... lol! Kidding, it usually gives you the speed and mine was dead accurate. My other car is 5 km/h under. I believe the calibration spec for speedo's is + ZERO / - 2.5 MPH (or 5KM/H).
Hence, dealer shouldn't really do anything about it.

Nutz
09-27-09, 03:36 PM
My Garmin GPS suction cupped to my windshield confirms my speed for accuracy. Easiest way to confirm.

tedcmiller
09-27-09, 03:41 PM
I have the built-in GPS which, of course, does not show speed. However, I also have a portable Garmin unit which does show speed. I will use that to check the car speedometer and post the results back here.

Low_ET
09-27-09, 07:30 PM
My digital speedometer has an error of about 2% (1 mph at 50 mph or 2 mph at 100 mph). The problem is that the analog speedometer has about double the error of the digital speedometer. (I have stock wheels and tires.) Both read higher than actual speed.