I am getting a new 9" rear next week. The car is a 2001 A4 (See Sig. For Details).

Current setup is a 10 bolt with 3:23 gears. I will now be going to 9" with 3:89 gears. Can someone tell me what will happen to the torque numbers making this jump in gear size?

My current Dyno numbers are:

RWHP = 400
RWTQ = 379


So, I take it my rear wheel HP goes down a bit. Does moving from 3:23s to 3:89s mean my Tq number will increase? If so, any idea on how to figure out approximatley how much?

Thanks,

Bill

 

There is no appreciable change in hp or torque on a chassis dyno with a change in the gear ratio.

Rich