Quote:
Originally Posted by Matt TuneTime
about 20% on a 6spd and 24% on an auto [ 6l80e has a higher power requirement to turn then a 4l60e ]
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Maybe on a mustang dyno those %'s will hold up, but not on a Dynojet. For reference, look at all the SAE Certified engines and see what they dyno at the wheels. You will see that the typical set up loses ~12% for a manual, ~15% for the auto on a dynojet.
To be losing 20+% at the wheels, you must be running a 9" rear end + an inefficient transmission, such as a C6 or maybe even a TH400.