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dyno results - tyre effects

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Old 08-11-2011, 04:48 PM
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speed rII
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Originally Posted by Ubermensch
The difference in diameter between a worn tire and a new tire is ~12% (25.3" vs 25.0"). That yields a smaller moment arm at the contact patch of the tire and a reduced torque value of ~12%. This could easily account for your difference in measured torque values.

-Shawn
I think that your math is off, and the correct % is 1,2...
Old 08-12-2011, 11:21 AM
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Ubermensch
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You are 100% correct. This is what happens when you do math too quickly during your lunch break
Old 08-12-2011, 12:29 PM
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OZ951
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Originally Posted by washington dc porsche
I noticed no one mentioned how tightness of straps affect the dyno results.
That is correct. When the dyno operator first noticed my lower than expected result he got straight into checking things like tyre pressure and strap tightness etc.


The ECU re-map has been done - dyno results here -> http://www.oz951.com/public/emmy.htm...%202011%20Dyno its the same link just a tad further down the page.



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