Panteras tend to have about 20% power losses due to the drive train, 20% of 500 flywheel bhp would be 100 bhp, so chassis dyno figures near 400 are about right on the money!
Front engine rear drive cars loose even more, about 25%.
Engines also test worse on the chassis dyno due to the exhaust system, air filter (if its installed) and real world things like that, that's why I like chassis dynos, they are real world, engine dynos don't tell the whole story.
George
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