1990 C4 rpm
Race Director
Joined: Jul 1999
Posts: 16,287
Likes: 104
From: Sun city CA
My stock 88 with an auto and 2.59 rear gear was 80 mph at 2000 rpm. My 91 Z with 3.07s is approx 90 mph at 2000 rpm.
What gears do you have now?
http://www.angelfire.com/fl/procrastination/rear.html
Last edited by Zrxmax; Mar 29, 2015 at 04:03 PM.
Team Owner
Joined: Sep 2003
Posts: 25,393
Likes: 2,741
Your '90 tach is probably not anywhere near correct. You want to put a scanner on the ALDL and confirm tach operation before you assume anything. If you've C68 AC you can use the AC control panel for some diagnostics, one of which is RPM but the best procedure is just put the scanner to the ALDL.
