Quote:
Originally Posted by huck369
(and if it were a tranny set up for 13's you'd probably have to run just the 16" rim with a strip of rubber around it  ) |
The largest variance in tire diameter from a stock Impreza size is 195-60-14. You would find a 10mph discrepancy only if you were traveling at 99mph. Any other stock Impreza size would be less. In nifty irony, the largest Outback tire also has a 10mph discrepancy at 99mph, albeit in the other direction.
There's some very basic math at play here.
EDIT: My mistake... The following is incorrect. The cluster is driven off of VSS2.
Your cluster doesn't care what size tires you have, nor what speed sensor you have. It does what the ECU tells it.
Your ECU only cares about two things: How many pulses it gets from the speed sensor in a given amount of time, and what size your tires (not wheels!) are.
If your transaxle is definitely from a 1998 Impreza, and if you're using a stock SVX diameter tire, then your 10mph discrepancy can be found at
no less than 333mph if the speed sensor is functioning correctly and to blame.
