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Just like the title says. When you dyno your car there is 3 printouts what is the difference of the 3? My STD dyno is the highest of them all, but I go off my lowest SAE numbers?
Nobody has ever explained this to me? Are the STD numbers what your car actually made that day in the actual conditions?
96 Formula WS6#555 MODS=little of this a little of that
I borrowed this a cobalt forum, it explains it pretty good. SAE is the standard.
There are few standards used in the dyno world for gathering HP and TQ numbers, UNCORRECTED, SAE and STD. Uncorrected is NEVER accepted in the world of dynoing and tuning as it does not factor in any weather conditions etc. Now here is where the big debate comes...is between SAE and STD. SAE (Society of Automotive Engineers) is the MOST ACCURATE AND WIDELY ACCEPTED FORM OF MEASUREMENT when it comes to the world of dynoing. Here is some more info I have gathered between the two.....
A lot of people have been asking about SAE .vs STD Dyno numbers so I thought this would help. Most people know that showing STD numbers read higher but not many know why. SAE represents more realistic standard conditions, STD artificially boosts numbers.
Identifying Your Correction Factor:
If you look at a dynojet graph in the upper right corner, you will see where it says the correction method being used. The options are SAE, STD, Uncorrected and a few not needed for discussion. You will also notice a smooth factor (up to 5) which dyno operators use to make the power curves and any other data displayed, such as AFR, seem more accurate and smooth. You will also see AFR graphs scaled DOWN to hide flaws in the curve.
A Mustang Dyno ONLY uses SAE Corrections. Smoothing can also be controlled as well as scale for the Graphical Outputs.
Most of the stated horsepower numbers are “Corrected” values. The correction standards were developed to discount the observed horsepower readings taken at different locations and weather conditions. It is obvious that an engine builder in Colorado could not produce as much horsepower as a shop at sea level. There is just less oxygen for the engine to burn at the higher altitude. What are less obvious are the other weather condition effects on the engine. So in order to compensate for this all advertised horsepower is “corrected” to several different industry standards.
"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 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."
Here is some quick math (using assumptions and round numbers):
Michigan Snowmobiler 1969 Firebird: email@example.com 1/8 1.70 60 ft. 11.7@116[/color] EPS cam 234/246 .602.606 114+3, 6.0 LQ4, L92 heads milled 10.5:1, Ported L76 intake, ported 90mm Holley TB, 100mm MAF, FIC Custom injectors, Hooker LT, PYPES dual exhaust with an X pipe, 4L65e with all of the good parts inside, FTI 4000 RPM Stall, 12 bolt with 3.73 gears. HP Tuner tuned by me
My SAE and STD numbers are almost exactly 2.6 difference.
As they should be if the calibrations are correct. People want to argue about weather in different areas affecting SAE to STD but its fixed data so it doesn't matter what the outside temps are because its going to correct to the set conditions regardless.
I agree with Blu on the +2.6xxx thats almost mine to the TEE!!! 538sae and 552std... sucks I didnt ask for the uncorrected cause most dont pay attention to it for some reason. Normally I do cause i like to see what power the car made in those conditions and no corrections just what it reads.
__________________ 2009 C6ZR1 Cyber Grey-Stock on DRfirstname.lastname@example.org- 1.52 60ft
2008 C6Z06 Atomic Orange-STOCK on DR's-11.09@126mph email@example.com w/1.501 60ft Bolt ons ONLY, Thanks to Monster clutches!!!!
2000 Red FRC H/C/I Chrome Z06's 444rwhp/385rwtq - Best ET. firstname.lastname@example.org-SOLD
98 Cayenne Red Z28 M6 -SOLD
Best et. showroom stock:12.88et @ 110MPH - Best et. Cam,100wet,ETstreet, 11.27@125MPH