Quote:
Originally Posted by 1slow370
6MT at 1500rpm in 4th = 319.66 wheel rpm
7AT at 1500rpm in 4th = 316.45 wheel rpm
370z purist, your thinking about final drives and multiplying the numbers all wrong, the final drive is the differential gearing so it's after the driveshaft.
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Okay, my math was ***-backwards too..
If we divide not mulitply to get those values, then...
AT @1500 in 5th = 446.83
MT @ 1500 in 5th = 406.28
But... the same conclusion holds -- in 4th, both transmissions have about the same mechanical advantage, but if we dyno the MT in 5th and the AT in 4th it will be an apples-oranges comparison due to a greater mechanical advantage for the MT.
So then do you agree everyone should just dyno in 4th?
That seems to be the most commonly selected gear anyway... I see very few runs done in 5th, but when I do, those always show higher (i.e., outlier) torque values as I had noted above.
EDIT: Actually, the 1% better wheel RPM due to gearing for the MT over the AT in 4th corroborates with the occasional evidence I see of about 1% more peak torque for the MT over the AT too... hmm.