Correcting speedo after gear change
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,753
Likes: 2
From: Fresno CA
Correcting speedo after gear change
Can I do this with a Hypertech programmer or do I have to do some kind of custom program? Going from 2.73 to 3.42 A4 car. Can I drive the car after the gear change without the speedo correction, will the speedo be the only problem or will the shift points be off, anything else? Thanks
Matt
Matt
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 180
From: S.W. Ohio. . . . . . NRA Life Member
Unlike F-Bodies, the C5 is a unique animal when it comes to MPH detecting. Because of this, there is no speedo error when changing rear axle ratios - across the board on all C5's.
Although changes in rear tire heigth will affect the speedo calibration.
Visit my web page for more info:
http://mikemercury.home.att.net/342.htm
Although changes in rear tire heigth will affect the speedo calibration.
Visit my web page for more info:
http://mikemercury.home.att.net/342.htm
Last edited by Mike Mercury; Nov 5, 2004 at 04:02 PM.
Team Owner
Joined: Aug 2003
Posts: 38,314
Likes: 35
Originally Posted by fdxpilot
Well, you don't need programming to correct the speedo, But if you go to MikeMercury's page on the link he posted, you will see several other reasons you do need programming.
And no, the Hypertech won't do the necessary gear scaling for the change from 2.73s to 3.42s.
Melting Slicks
Joined: Jun 2001
Posts: 3,123
Likes: 3
From: Orland Park Illinois
St. Jude Donor '06-'07
Originally Posted by EB20003
And no, the Hypertech won't do the necessary gear scaling for the change from 2.73s to 3.42s.Stay away from a Hypertech to change shift points after a rear end gear change---they are useless.....
