Quote:
Originally Posted by toohighpsi
We hurt the stock torque converter lockup clutch from the second gear launches during Power Tour and not paying attention to the fact that it was set to lockup at 27mph. Had I noticed this in the cal and raised it it probably would have been fine, but since we had to pull the trans we decided to go with a more robust solution.
The A8 has a couple issues in a car at higher power levels;
First it requires a significant amount of torque management during shifts to keep it alive, when you're making 5 shift changes during a pass with each shift change requiring ~0.25 sec of reduced power this becomes an impact to the performance of the vehicle. With torque management turned off the trans will be lucky to make 2-3 passes before failure. The TH400 will not require any power reduction during shifts.
Also, first gear is too low at higher power levels, while this is the reason why A8 cars perform so well in a stock / slightly modified condition, it makes traction difficult with small tires with higher power.
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Makes sense....thanks for the explanation. I assumed the 8l90 was everybit as strong as a 4l80 but I guess not. How much power do you think a 8l90 can take with no TM?