3.90s for M6
Thread Starter
Safety Car
Joined: Oct 2007
Posts: 4,411
Likes: 40
From: San Diego Ca
3.90s for M6
I am very close to getting them. What rpm are you guys seeing in 6th at 65-75 (M6). Does anyone regret installing them? I drag race and will be participating in HPDEs also. Feedback appreciated. -Thanks
Drifting
Joined: Feb 2005
Posts: 1,770
Likes: 0
From: in ur mirror, 'bout to pass.. CA
I got 'em
..in my M6 coupe, couldn't be happier. 6th gear @80mph is turning 2700rpm's. 3rd gear is the power gear; all kinds of grunt now. Most of my local tracks (waterford, grattan for example) are 3rd gear tracks, with some 4th and 5th if I get the rythm right. You'll be running higher in the rpm band though; keep an eye on oil temps and be damn sure you're running the recommended 'one quart over' on the oil to prevent starvation.
Whatever rear set you go with, pay attention to the alignment of the gear set during install, and follow recommended break-in procedures for the type and manufacturer of your gear set. Grenading a rear end in these cars can be very costly!
Whatever rear set you go with, pay attention to the alignment of the gear set during install, and follow recommended break-in procedures for the type and manufacturer of your gear set. Grenading a rear end in these cars can be very costly!
Racer
Joined: Mar 2008
Posts: 399
Likes: 10
From: Houston
3.90s here in a coupe, not sure what rpms im at at different speeds but ill try to remember and write them down... btw car feels very strong compared to my last FRC with 3.42's that was lighter and smaller wheels
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Drifting
Joined: Apr 2007
Posts: 1,760
Likes: 4
From: Broward County Florida
The one thing I do know about gears is that they HAVE to match the power you're putting out. I can't imagine a 1000hp drag car would ever find traction with 4.11's installed. 
Would have to launch in 6th.
