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Author Topic: The ambient correction factors.  (Read 20041 times)
woo
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« on: September 17, 2012, 01:57:53 PM »

I read that there actually quite a few different standards for the dyno correction for atmospheric conditions.

Can I assume that this program corrects data to "the newer SAE J1349 standard of 77F (25C) day with 0% humidity and a barometric pressure of 29.234 in-Hg (99 KPa). "

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The most common are the SAE standards. The older J607 standard considers that the engine was run on a 60F day with 0% humidity and a barometric pressure of 29.92 in-Hg or the newer SAE J1349 standard of 77F (25C) day with 0% humidity and a barometric pressure of 29.234 in-Hg (99 KPa). Also the ECE standard is the same as the SAE J1349, but does not use mechanical efficiency in the calculations. The DIN standard which corrects to 68F (20 C) day with 0% humidity and a barometric pressure of 29.92 in-Hg (101.3 KPa) and the JIS standard corrects 77F (25 C) day with 0% humidity and a barometric pressure of 29.234 in-Hg (99 KPa), but uses different correction curves than the others (as a substitution for using mechanical efficiency factors). Further, we have the J1995 corrects 77F (25 C) day with 0% humidity and a barometric pressure of 29.53 in-Hg (100 KPa).


http://www.land-and-sea.com/dyno-tech-talk/corrected-horsepower.htm
« Last Edit: September 17, 2012, 03:25:14 PM by woo » Logged
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« Reply #1 on: September 17, 2012, 03:32:50 PM »

Yes, it is based on the J1349 standard and your numbers are correct.

Mike

I read that there actually quite a few different standards for the dyno correction for atmospheric conditions.

Can I assume that this program corrects data to "the newer SAE J1349 standard of 77F (25C) day with 0% humidity and a barometric pressure of 29.234 in-Hg (99 KPa). "

Quote
The most common are the SAE standards. The older J607 standard considers that the engine was run on a 60F day with 0% humidity and a barometric pressure of 29.92 in-Hg or the newer SAE J1349 standard of 77F (25C) day with 0% humidity and a barometric pressure of 29.234 in-Hg (99 KPa). Also the ECE standard is the same as the SAE J1349, but does not use mechanical efficiency in the calculations. The DIN standard which corrects to 68F (20 C) day with 0% humidity and a barometric pressure of 29.92 in-Hg (101.3 KPa) and the JIS standard corrects 77F (25 C) day with 0% humidity and a barometric pressure of 29.234 in-Hg (99 KPa), but uses different correction curves than the others (as a substitution for using mechanical efficiency factors). Further, we have the J1995 corrects 77F (25 C) day with 0% humidity and a barometric pressure of 29.53 in-Hg (100 KPa).


http://www.land-and-sea.com/dyno-tech-talk/corrected-horsepower.htm

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woo
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« Reply #2 on: September 17, 2012, 04:05:32 PM »

Thanks.  Smiley
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