The Effect of Dynoing in Different Gears

Jordo! · 02-22-2011, 04:22 PM

Quote:

Originally Posted by azn370z

You want to dyno in 5th gear for the 6 speed and 7 speed. But the 7 speed will hit the speed limiter unless it's been removed with a flash. So most are done in 4th.

What gear will limit your top speed to about 125 MPH? I see about the same torque and speed values for the 7AT and 6MT when this is the top speed.

BTW, the gearing ratios for the two trans are:

Gear M/T A/T
1st 3.794 4.924
2nd 2.324 3.194
3rd 1.624 2.043
4th 1.271 1.412
5th 1.000 1.000
6th 0.794 0.862
7th - 0.771

Quote:

Originally Posted by 370Z Purist

I was under the impression that you want to do dyno runs in the gear that is closest to 1:1 ...

Yes, but apaprently you can't in an untuned 7AT and people seem to randomly dyno in 4th or 5th on the 6MT... hence the problem.

However, when top speeds are approximately equal, so are measured torque values between the two transmissions.

Wonder how the final gear factors into this too...

They are: MT = 3.692 AT = 3.357

Hmmm. Now I want to dyno in 5th and see what happens (I'm tuned).

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