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Broken AW71, second in 6 months.... 700

posted by  someone claiming to be philip bradley on  Tue Dec 24 14:20 CST 2002 [RELATED]

I have read the formulas many times, and have them somewhere, but do not know them off the top of my head. You have two numbers to work with, so get both formulas - the trap speed to wheel hp and the wheel hp to crank hp. I think you will find the formulas pretty accurate as you have two references to use. Very roughly, crank hp on an automatic will be wheel hp plus 20%. Your 177 whp figure would be about 212 crank hp. That is what I would have guessed based on my recollection of how crank hp on an automatic relates to trap speed, also. I know of one person who ran a 90 mph trap speed at 11 or 12 psi in a stock 88 or 89 745T with AW71. He should be 20 hp down on you, which could be attributable to hot weather where you are or less ideal tuning on your part.

Anyway, at your power levels, the stock trans should be fine. If you are doing a lot of power braking or dropping the trans into gear from park or neutral, you are destroying your trans. The former cause can be addressed; the latter cannot.

Philip






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