Quote:
Originally Posted by XwChriswX
You do it in 5th gear because of the 1:1 ratio. That's the one that will give you direct engine power.
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That is true, but you'll get the same info with less stress on the motor in 4th. 5th gear has less grunt than 4th, so the motor is doing more of the work. On dynojets, 5th gear dynos read about 1% higher than 4th, but otherwise, it will work fine.
On an untuned 7AT, it will hit the limiter in 5th, so they have to dyno in 4th.