Chassis Dyno #'s-vs- Track #'s

I'm very curious about my chassis dyno #'s. I'm having an awfull hard time believing them. I had my 418 dynoed on an engine dyno, and once in the car on the chassis dyno, #'s in sig. My track times however tell a different story. Going by weight to mph the car had to be making somewhere between 510-525 rwhp Wich is where it should have been. If the #'s were real on the chassis dyno, I lost 22% from the engine dyno with a 5spd I had a messed up run with missing 2nd and having the wrong rpm chip in the msd wich caused a rev-limiter hit in 1st,2nd,3rd,and 4th gear and the car still ran 119.1mph so I know that the 126.66 was not a fluke. Dont know, what do you guys think???????????????????????????????
Mike.

Michael Yount said:

. The sob is quick - are you happy with the way it's running/driving? If so, don't worry about the times/numbers, and enjoy racing the car.

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Not sobbing, SUPER happy with times, just curious. Who wouldnt be happy with 126.66mph
mike.

90Notch said:

"I lost 22% from the engine dyno with a 5spd"

Did you use same headers, exhaust and same accessories on engine dyno? Seems most don't then when they install the restrictions on and hit the dynojet they're surprised at the losses.

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I dont think I lost that much, dyno#'s dont match track #'s. Michael Yount made some good points as always.
mike.