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Old 06-04-2001, 11:50 AM   #24
sponaugle
Scooby Specialist
 
Member#: 4498
Join Date: Feb 2001
Chapter/Region: NWIC
Location: Portland, Oregon
Vehicle:
WRX H6-3.0 Turbo
www.surgelinetuning.com

Post

In another post series about this, someone mentioned that they thought most runs at other dynos are done in 4th gear. As far as I have seen, most are done in 3rd. While 4th is closer to 1:1, I'm not really sure how much that matters. There is still a final drive ratio, so it is not like the wheels are 1:1 to the engine.

If you look at www.jacksonracing.com their dyno graphs are obviously done in 3rd gear (as by the 89 RPM/MPH)

When we were doing the calibration to determine driveline loss, the car was taken up to 85 MPH and then coasted down. Since a run in 3rd caps at about 95, I would think this calibration would be most accurate for a 3rd gear run. I would guess there are losses that are not linear with speed (some perhaps at speed^2, etc).

Anyways, I'm planning on heading back up soon with some more mods, and I'll do 3rd gear runs this time.

Who was the MS guy in the white WRX? I always seems to forget names!


[This message has been edited by sponaugle (edited June 04, 2001).]
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