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Old 08-10-2009, 09:26 PM   #9
[ion] C2
636 whp
 
Join Date: Aug 2006
Location: AZ
Posts: 11,876
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Quote:
Originally Posted by AleroB888 View Post
Ion, I’m not running as much power as your car, but probably have more area under the torque curve.
Ah yes that makes sense.
Quote:
Originally Posted by AleroB888 View Post
I do not make any adjustments in the PCM for the difference in diameter. The speedometer read 106-107 trap speed, when it was actually 101.
You should, it seems to throw things off with the VSS pulses wrong. When I ran with my drag radials which were quite a bit shorter in diameter than my normal wheels, the car didn't seem to perform as it should, considering a lot of things are dependent on VSS like the shift times.
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