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Originally Posted by Adam
Maybe I'm giving the dyno guys too much credit here, but I would think they would warm up the engine before doing a pull to redline? Also, I would trust a real dyno way before the good old "butt dyno." So many people swear certain "upgrades" makes their car faster due to placebo effect, when in reality it's not any quicker and sometimes even be slower. While not perfect, a dyno is much more objective than we are and discrepancies are often due to user error more than the dyno itself.
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I don't tend to give dynos too much credit.
They generally do one or two runs and that's it.
They can completely skew results if the operator is not well versed on his machine.
Also with a dyno, you're not really putting a "real" load on the engine, as the car is stationary (on rollers) and the load depends on the dyno's program or operator input.
With an accelerometer you get real load on the engine, as the car has to accelerate it's own mass and cut through the air (drag). It's much harder to foul up results from an accelerometer, especially when you average out 10 runs.
Happy Boxstering,
Pedro