Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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Solarman
Dennis mcIntyre

(20 posts)

Registered:
11/09/2007 10:02PM

Main British Car:


authors avatar
Gear ratio woo`s
Posted by: Solarman
Date: December 18, 2007 07:50PM

I have a Ford 8" and it has 3.4:1 ratio how will this compare to the MGB 3.9:1. Shoul I change this? what are the pros and cons?
Good Pic.jpg


Moderator
Curtis Jacobson
Portland Oregon
(4595 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

authors avatar
Re: Gear ratio woo`s
Posted by: Moderator
Date: December 18, 2007 08:53PM

I think you might find Dan Masters' nifty calculator very helpful - this link will open as an Excel spreadsheet.

[www.britishv8.org]

If you enter gear ratios, tire diameter, etc., the calculator correlate engine speed (shift points) to road speed for you.


Citron
Stephen DeGroat
Lugoff, SC
(367 posts)

Registered:
10/23/2007 09:43PM

Main British Car:
1970 MGBGT V6, 7004R, AC, matching trailer 3.1 liter

Re: Gear ratio woo`s
Posted by: Citron
Date: December 18, 2007 09:00PM

Curtis,
That is a great spread sheet. I am going to try a 3.0 ratio. It will put RPM at about 2200 at 80. Just where I think it should be.
Will have to run again at MAxton and see if I'm faster that was y. Now I am at 110 at 5700 in third gear. ( 4 speed Auto.)
The new gear will put me down under 4000 at the same speed.

Steve
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NixVegaGT
Nicolas Wiederhold
Minneapolis, MN
(659 posts)

Registered:
10/16/2007 05:30AM

Main British Car:
'73 Vega GT 4.9L Rover/Buick Stroker

authors avatar
Re: Gear ratio woo`s
Posted by: NixVegaGT
Date: December 19, 2007 08:30AM

That's a hot car, man! I love the custom headlight setup. What engine are you running now? If it's a transplant with more power I think you'll like the Ford ratio better. With more torque you won't need the extra gear and you can lower your crusing RPMs.


Solarman
Dennis mcIntyre

(20 posts)

Registered:
11/09/2007 10:02PM

Main British Car:


authors avatar
Re: Gear ratio woo`s
Posted by: Solarman
Date: December 19, 2007 08:43AM

It is a Ford 302 400hp to the wheels and 12.1 sec 1/4 mile . Light are Dodge Neon

Thanks man


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