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post #17 of (permalink) Old 09-22-2012
tehMoose's Avatar
Joined: Nov 2010
Location: Austin
Posts: 210
Originally Posted by Intense View Post
SAE corrects to 60*F, 29.92 Hg, 0% humidity. That's why many usually get that SAE so numbers can be compared and corrects all rwhp to the same atmospheric conditions. The most important factors are the first two as far as affecting rwhp/acceleration with humidity a distant 3rd. Given that, if you can run in a lower temp and higher atmospheric pressure...power will increase and a better ET and mph is possible.

Density Altitude factors in all these atmospheric conditions and can be used to correct all timeslips to Sea Level, 29.92 Hg, 0% humidity.

This is without checking, but I think my memory is correct on the numbers.

The older SAE J607 standard is 60F, 29.92in-Hg, and 0% humidity. Which is now being used in the STD correction formula on most dynos.

The newer SAE J1349 standard of correction use 77F, 0% humidity 29.23 in-Hg.

The J1349 is the currently accepted correction for SAE standard.

2011 GT Prem - 400a, Brembo Pkg, 3.55s, 6spd
OLD 405rwhp/381rwtq - 12.71 @ 113.13mph, 2.099 60' on stock tires (DA corrected 12.3 @ 116mph)
Mods: Boss 302 bottom end, JPC Stage 1 heads, Boss 302 Manifold/Oil Cooler/Front Fascia/Rear Diffuser, Mishimoto Radiator, Spec Clutch/Flywheel, Airaid CAI, JBA Long Tubes, Pypes Super System, Eibach Pro-Kit, UMI LCA/Relo Brackets/Panhard Bar, GT500 wheels/Nitto NT555 (255/45 F, 285/40 R), Barton Shifter/Bracket, SGII /w blendmount, V1
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