65 speedometer
Thread Starter
Racer
Joined: Sep 2014
Posts: 425
Likes: 32
From: richmond virginia
65 speedometer
I need some help getting my speedometer setup correctly. When I'm driving 50 mph, I'm actually going 63 mph. How many less teeth do I need to make the speedometer read correctly?
Safety Car
Joined: Jan 2006
Posts: 3,663
Likes: 361
From: Smyrna/Vinings, Georgia
Race Director
Joined: Apr 1999
Posts: 10,866
Likes: 717
From: Beverly Hills/Pine Ridge Florida
IF you pull the driven gear in your trans, and find that you have 22 teeth, for example...
22 X 0.793 = 17.4 round down to 17.
In this example, you'd need a 17 tooth gear....
http://www.thegearbox.org/catalog/it...82/3697857.htm
HOWEVER, note the 2 different sizes of DRIVE gears in the transmission and note the DRIVEN gears that are used with that particular sized drive gear.
Remember too that the diameter of your tires as well as changes in the rear gear ratio might be causing the large discrepancies in your speedo reading...... assuming that the speedo head itself is properly calibrated.
