rear end upgrade
Thread Starter
Intermediate
Joined: Dec 2004
Posts: 33
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rear end upgrade
undefined
does any one know how to measure encrease in h.p. on the ground from installing the g.m 3.8 gear placing 2.3(or what ever it is) est now estimate now that the a4 349.8 rwhp is putting don 253 hp..the ugrade can be done for about 1800.00..
does any one know how to measure encrease in h.p. on the ground from installing the g.m 3.8 gear placing 2.3(or what ever it is) est now estimate now that the a4 349.8 rwhp is putting don 253 hp..the ugrade can be done for about 1800.00..
Racer
Joined: Oct 2004
Posts: 366
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From: Sunnyvale CA
If you are asking about changing the rear differential gearing from 3.42 to 3.8(?) then the answer for you is simple. There is no net horsepower gain from such a change. There is more torque multiplication which slightly improves launch and quarter mile times...at the sacrifice of fuel economy on the highway.
Race Director
Joined: Oct 2004
Posts: 10,516
Likes: 2
From: Virginia Bch VA
Cruise-In VI Veteran
Cruise-In VII Veteran
St. Jude Donor '06
He's Right On
Originally Posted by HalM
...changing the rear differential gearing from 3.42 to 3.8(?) ...no net horsepower gain ...more torque ...slightly improves launch and quarter mile times...at the sacrifice of fuel economy on the highway.
100%
