Calculating HP from Air Mass

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08-23-2012, 04:16 AM

#11

primetime

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I'll log mine this weekend when Imolamonster and I hit the strip... Unfortunately, the DA will be 3K+... Hopefully, can run 11.8-11.9 in that high of a DA... Will see...

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08-23-2012, 03:03 PM

#12

4SIDUA

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Here is the 2010 S4 Stock dyno results done by APR: (330.67 AWHP and 336.09 AWTQ)
http://www.quattroworld.com/blog/apr...stock-2010-s4/

Last edited by 4SIDUA; 08-23-2012 at 03:06 PM.

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08-24-2012, 06:27 PM

#13

Hal_TT::CBP

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Well of course there is but is it 5%? 10%? 12%? What variables?

Quote:

Originally Posted by igo300

With 180 dyno runs on a B5 and 200 Zeitronix runs I think my real world results have convinced me there is some credibility in the relationship of air flow to hp.

NA or Turbo? Barometric pressure? Elevation? Hub dyno or roller? What tire compound? Peak measurement or specific RPM? Repeatable on different cars? See my point?

You'd be hard pressed to say the the B5 chassis with (pick your engine, my specialty is the 2.7tt) would be directly comparable to a B8 powerplant with all its different characteristics. I'm not disagreeing I'm just saying its damn near impossible to compare MAF readings to what two cars are making HP-wise. I could pick up 10-15gps on my Stg3 B5S4 with a filter change yet there was no measurable performance difference between the runs, probably due to all the other variables difficult to isolate when trying to measure performance gains/losses.