Remember that with the AOD, the loss is highly dependent on your converter too. I've got a relatively loose converter that's slipping away about 35hp when its unlocked. I made 290RWHP with it unlocked and 325RWHP with it locked. The locked RWHP is only a few HP less than what I made with the T5 last year. With my T5, I found that if I subtracted 17% from the Desktop Dyno results, they matched almost identical to the chassis dyno results up through about 6000rpm. The good thing about the AOD/converter is the torque multiplication. I made over 400ft-lbs when we flashed the converter compared to 340ft-lbs with is locked and 352ft-lbs with the T5. In the end, I don't think the pure losses in the AOD are really that much more than the T5, probably around the 20% level compared to 17% for the T5.
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Jeff Chambers
T/S #3
11.462 Seconds/117.43 MPH
Chambers Racing Team