Dynoing 6 speed

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Nov 23, 2008 | 03:24 PM

rb68rr

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3rd Gear

Joined: Nov 2008

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Dynoing 6 speed

What gear should you be in on the dyno? Would the numbers be different in 3rd vs 4th?

Nov 23, 2008 | 03:54 PM

Patches

Team Owner

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From: Lake Elsinore, CA

4th on a 6-speed C5 (3rd on an A4). That is your 1:1 gear. Other gears will affect the readings +/- due to ratios above or below that. On a dyno, only torque and speed can be measured so power must be calculated from the torque and speed figures.

Nov 23, 2008 | 04:27 PM

FourG63 97GST

Melting Slicks

Joined: Mar 2006

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From: South Florida FL

so only dyno numbers is affected?
I do third because I street tune

Nov 23, 2008 | 05:24 PM

dixonk

Burning Brakes

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From: Kansas City Missouri

St. Jude Donor '09

Well if the dyno is not loaded you can't do a street tune anyhow.

Nov 23, 2008 | 05:25 PM

azZ06Mike

Melting Slicks

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From: Peoria Arizona

St. Jude Donor '11

4th!

Nov 23, 2008 | 05:50 PM

rb68rr

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3rd Gear

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I also heard that by changing the rear end gear ratio to, let's say, 4.10 would lower the hp and torque numbers on a dyno. Is this true? Thanks, R.B.

Nov 23, 2008 | 11:05 PM

rb68rr

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3rd Gear

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ttt

Nov 23, 2008 | 11:25 PM

Riley P

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From: Saskatoon

I am not 100% on this but I believe 4.10's would affect the outcome. This is because the 4.10 gears have different power loss properties than lower gears, such as more tooth contact and added friction. I do not think this is a huge difference, but could account for something. The rear end ratio should be accounted for anyway when doing a pull. If I am totally wrong on this info, please let me know.