what is ur speed in 5th gear at 3000rpm?? between 80-85 or something or lower...cause i think my speedometer is wrong.
the faster i go the bigger the difference its than the original speed..like if i go 15mph it is actually 15mph but when it says 85mph on my car i think i am going 75mph.what could be causing this?

 

mine is exactly 85 at 3000 rpms

 

yea mine sits at 85 also. 93 se 5spd. why do you think its off ? did you put bigger rims on it ?

 

i have 17s with 205/40 so the tires are small.. i really dont know..maybe the thing that goes into the tranny that measures the speed..

 

85ish give or take a few, i dont completely remember.

 

stock 205/65/15 = 25.49
yours 205/40/17 = 23.46
so speedo 65=59.81 actual
Try 215/50/17 = 25.46
should cost between $90 - $200 a tire (at least I could sell for that)
Math courtesy of : http://www.net-comber.com/tirecalc.html