In a non-O/D GT6, you can double the number on the tach and get approximate mph.
Larry
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Subject: speedo is out...mph to rpm calculations
Author: Marcus Tooze <tooze@vinny.cecer.army.mil>
Date: 9/26/94 12:17 PM
My speedo cable broke (again)...I did some quick calcs. and want to see
if they figure w/ you guys. As I've only had the car a week, I hadn't
payed much attention to what rpm = what speed in 4th...
rear end is 3.27:1, 4th gear is 1:1, tires are 155/70/13
Tire circumference is ABOUT 70 inches... 0.0011 miles.
For 3000 rpm rear wheel turns 917 times ...
which equals 1.01 miles (~1 mile)
so 3000rpm is about 60 miles an hour and 3500rpm is about 70????
Marcus 'my math went up the spout when i left high school' Tooze
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