Can anyone think of a reason why the electric speedo in my '91 RS seems to lose it's accuracy at speeds of ~70mph+ ? It seems to read much faster than I'm actually going, by about 10-15%. My tires are the correct size, and I have no reason to suspect the gearing on the VSS is incorrect. Is it possible there's some sort of electrical wierdness going on ?


Kyle

 

The same thing is happening to me. I don't know why.

 

my 90 IROC has been having that problem also and it is bone stock if anyone knows please help

 

Probley a worn plastic speedo gear on the magnetic pick up on the tranny or the sensor itself is bad. HOW do you all know it's off?? Mine is perfect and I have 88,000 right now. The sensor with out the gear is $50 bucks if you just want to replace it.

 

any time I see those signs that tell you your speed i check at various speeds when my car is saying 30 im going 26 at when i think im going 50 it says 42 and gets worse at higher speeds . Now i Know those stupid signs are good for somthing.

 

Be careful with those signs, they aren't as accurate as a rador gun pointed RIGHT at you. I would say your speedo is fine just that the sign isn't directed at you correctly.