odometer
Thread Starter
Instructor
Joined: Jul 2008
Posts: 108
Likes: 0
From: Columbus Mississippi
odometer
does anyone know where the computer reads the speed if the ar and the mileage? i want to put on some 17s on my 86 to accomodate the C5 brake upgrade i plan on putting on but want to make sure i adjust everything properly if needed. ive heard two different stories, 1. that it is measured on the axle, and 2 that it is measured in the rear diff. also, im planning on putting CCW Classics on as the new rims. anyone have any suggestions on new widths? stock or wider? any performance increases? Thanks! 
Burning Brakes
Joined: Feb 2008
Posts: 988
Likes: 7
From: Sarasota Fl
does anyone know where the computer reads the speed if the ar and the mileage? i want to put on some 17s on my 86 to accomodate the C5 brake upgrade i plan on putting on but want to make sure i adjust everything properly if needed. ive heard two different stories, 1. that it is measured on the axle, and 2 that it is measured in the rear diff. also, im planning on putting CCW Classics on as the new rims. anyone have any suggestions on new widths? stock or wider? any performance increases? Thanks!
Team Owner
Joined: Sep 2003
Posts: 25,414
Likes: 2,745
If you keep the tire dimensions (diameter/RPM-revolutions per mile) equal or similar your speedometer/odometer calibration is usually not a problem. It's likely accommodated with only a change of the "driven" gear on the speed sensor which is transmission mounted. If you start changing the tire dimensions "dramatically" it can get more complicated.
I would suggest you "confirm" the accuracy of what you have before you start doing your replacements.
I would suggest you "confirm" the accuracy of what you have before you start doing your replacements.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
I don't think you'll be off too far with the new rims and tires bolted up. A couple of the Corvette catalog companies sell an electronic calibrator box that you hook up to the car and adjust the VSS signal. The module stays in the car once installed. Price was ~ $200 if I remember right.
