A4 vs. A6 drivetrain loss...
Thread Starter
Race Director
Joined: Dec 2006
Posts: 12,367
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From: Fort Worth, Texas
A4 vs. A6 drivetrain loss...
does anyone know the parasitic loss difference between the two? Dyno #'s seem to be 10-15hp less for the a6(which I thought the internals were beefier, but not sure of the actual torque rating), or could it be due to the a6 not having a 1:1 ratio gearing?
Safety Car
Joined: Sep 2006
Posts: 3,922
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From: Cheektowaga NY
St. Jude Donor '08
The A6`s will always dyno lower than a A4 because the A6`s don`t have a 1 to1, its a 1 to 1.15.
Hope this helps.
Team Owner
Joined: Feb 2001
Posts: 27,253
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From: Short Hills, NJ
That's got to be the main reason for the overall lower average rear wheel output numbers from the 6L80 versus the 4L65 but I do also believe that the beefier/heavier nature of the A6 trans might eat up a couple more horsepower as well. 
