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Old 06-22-2005, 09:04 PM   #1
Scooby Newbie
Member#: 3385
Join Date: Dec 2000
Location: Golden, CO
2002 WRX

Default Comparing dyno results: 50F vs. 90 F day

Twice I have dynoed my car on the same AWD Dynojet. Once when it was 50 degrees F and again recently at 90 degrees. Both at 5280 elev. Does the SAE correction for T, P and humidity (1.22 in the first case and 1.27 in the other) make the hp and tq numbers from the two days comparable? What sort of % error should one expect between different days and dramatically different atmospheric conditions? Even with the correction, would the turbo spool be different (laggier) at 90 degrees than at 50 degrees?

Just trying to figure out if the 6-8 ft lb drop and slightly slower spool is due to atmospherics or the underdrive pulley I replaced with stock recently (tired of p0340 CELs).



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