Took the 08 Ls3 Vette to the dyno after the headers install
07-26-2008, 01:04 PM
#21
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Ive never seen STD numbers lower than SAE but they can be close.
SAE:
"SAE (Society of Automotive Engineers), USA. Power is corrected to reference conditions of 29.23 InHg (99 kPa) of dry air and 77 F (25°C). This SAE standard requires a correction for friction torque.
STD:
STD is Another power correction standard determined by the SAE. Power is corrected to reference conditions of 29.92 InHg (103.3 kPa) of dry air and 60 F (15.5°C). Because the reference conditions include higher pressure and cooler air than the SAE standard, these corrected power numbers will always be about 4 % higher than the SAE power numbers. Friction torque is handled in the same way as in the SAE standard."
"SAE (Society of Automotive Engineers), USA. Power is corrected to reference conditions of 29.23 InHg (99 kPa) of dry air and 77 F (25°C). This SAE standard requires a correction for friction torque.
STD:
STD is Another power correction standard determined by the SAE. Power is corrected to reference conditions of 29.92 InHg (103.3 kPa) of dry air and 60 F (15.5°C). Because the reference conditions include higher pressure and cooler air than the SAE standard, these corrected power numbers will always be about 4 % higher than the SAE power numbers. Friction torque is handled in the same way as in the SAE standard."
Last edited by PatKrager; 07-26-2008 at 01:07 PM.
07-26-2008, 05:52 PM
#22
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Not in my case, the STD numbers were higher than my SAE numbers, both cold and hot weather. I always have the dyno operator plug it in just to see. Here are the correction factors:
SAE j1349 correction:
29.23 in/hg.
77 degree temp
0 percent humidity
Standard correction (STD):
29.92 in/hg.
68 degree temp
0 percent humidity
Shouldn't the STD always be about 3% higher if this is what it corrects to?
SAE j1349 correction:
29.23 in/hg.
77 degree temp
0 percent humidity
Standard correction (STD):
29.92 in/hg.
68 degree temp
0 percent humidity
Shouldn't the STD always be about 3% higher if this is what it corrects to?
Here is a great explanation of the SAE standards
http://www.land-and-sea.com/dyno-tec...horsepower.htm
07-26-2008, 06:15 PM
#23
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The older J607 standard considers that the engine was run on a 60°F day with 0% humidity and a barometric pressure of 29.92 in-Hg or the newer SAE J1349 standard of 77°F (25°C) day with 0% humidity and a barometric pressure of 29.234 in-Hg (99 KPa).
07-26-2008, 06:34 PM
#24
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Hm. I always thought STD was applying no correction factor at all, but using the temp, pressure, humidity, etc that existed in the dyno shop. Learn something new every day 
07-27-2008, 04:32 PM
#25
Drifting
Sounds like alot for an A6 car.
Mine has AR headers, K&N, ported TB and with a tune, I'm making 390 to the wheels and I think the tq is about 377.
This was not a Dynojet however.
Mine has AR headers, K&N, ported TB and with a tune, I'm making 390 to the wheels and I think the tq is about 377.
This was not a Dynojet however.
07-27-2008, 05:51 PM
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07-27-2008, 06:38 PM
#27
Drifting
^^^^ 12-15 @ the tire porting hte stock TB & intake?
07-27-2008, 07:37 PM
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07-27-2008, 08:41 PM
#30
Drifting
07-27-2008, 08:46 PM
#31
Team Owner
nice
07-27-2008, 09:42 PM
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07-27-2008, 10:01 PM
#35
Drifting
07-27-2008, 10:15 PM
#36
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07-27-2008, 10:19 PM
#37
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07-27-2008, 10:23 PM
#38
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07-27-2008, 10:30 PM
#39
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07-27-2008, 10:49 PM
#40
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