gear ratio question...
Melting Slicks
Joined: Dec 2000
Posts: 2,041
Likes: 0
From: Wichita, KS
Try going to this site and see if the program there gives you the same number that I got 4.15 to 1.
http://www.smokemup.com/auto_math/rear_end.php
If the link won't work then you can go to www.smokemup.com and look for the auto math tab at the top of the page. Then scroll down for rear gear ratio.
BTW: I used a 27 inch tire and 3100 RPM> The numbers shown are the program default.
http://www.smokemup.com/auto_math/rear_end.php
If the link won't work then you can go to www.smokemup.com and look for the auto math tab at the top of the page. Then scroll down for rear gear ratio.
BTW: I used a 27 inch tire and 3100 RPM> The numbers shown are the program default.
Last edited by 1979toy; Nov 17, 2004 at 08:47 PM.
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Thread Starter
Safety Car
Joined: Mar 2002
Posts: 4,411
Likes: 1
From: Okeechobee Florida
Originally Posted by 1979toy
Try going to this site and see if the program there gives you the same number that I got 4.15 to 1.
http://www.smokemup.com/auto_math/rear_end.php
If the link won't work then you can go to www.smokemup.com and look for the auto math tab at the top of the page. Then scroll down for rear gear ratio.
BTW: I used a 27 inch tire and 3100 RPM> The numbers shown are the program default.
http://www.smokemup.com/auto_math/rear_end.php
If the link won't work then you can go to www.smokemup.com and look for the auto math tab at the top of the page. Then scroll down for rear gear ratio.
BTW: I used a 27 inch tire and 3100 RPM> The numbers shown are the program default.
that table dosnt help because i dont know tire height, nor dose it take into consideration my tray ratio...
Melting Slicks
Joined: Dec 2000
Posts: 2,041
Likes: 0
From: Wichita, KS
Originally Posted by SIGNGUY
thanx for your help...but...
that table dosnt help because i dont know tire height, nor dose it take into consideration my tray ratio...
that table dosnt help because i dont know tire height, nor dose it take into consideration my tray ratio...
The correct tire sizes for a '79 are Standard 225-70-15 with a stated diameter of 27.2 inches, optional was the 255-60-15 with a stated diameter of 27.1 inches. You could go out to the garage and measure your actual tire diameter.
Melting Slicks
Joined: Jul 2002
Posts: 3,128
Likes: 3
From: Deltona (son of Deland and DAYTONA) FL
try this one instead. http://www.smokemup.com/auto_math/mph_range.php
You'll have to pick your tranny. Tire diameter on 255/60/15's is 27 inches. 225/70/15 = 27.4
if your not sure, plug your tire size in here
http://www.smokemup.com/auto_math/tire_diameter.php
You'll have to pick your tranny. Tire diameter on 255/60/15's is 27 inches. 225/70/15 = 27.4
if your not sure, plug your tire size in here
http://www.smokemup.com/auto_math/tire_diameter.php
Drifting
Joined: Nov 2000
Posts: 1,536
Likes: 10
From: Sault Ste Marie Ontario
3100 rpm with a 27.1" tire your speedo shoud read:
With 3.08 - 81.1, 3.36 - 74.3, 3.55 - 70.4, 3.73 - 67 mph, 4.11 - 60.1.
Easy way to check rear gear ratio:
Lift rear off ground. Spin tire 10 times and count the revolutions of the driveshaft. eg. 3.08 will turn almost 31. 4.11 just over 41.
With 3.08 - 81.1, 3.36 - 74.3, 3.55 - 70.4, 3.73 - 67 mph, 4.11 - 60.1.
Easy way to check rear gear ratio:
Lift rear off ground. Spin tire 10 times and count the revolutions of the driveshaft. eg. 3.08 will turn almost 31. 4.11 just over 41.