well i am pretty pleased Mr z and i took my car to a new dyno hear in lafayette La at hoyts shop my car did 344 hp before the tune and 381hp 395trq corrected and sae was 370 hp and 378 trq there printer was not working so i can not post it today but mr z is going to go back tomorrow with a pen drive and post it for me

can any one explain to me the diference in corrected and sae thanks

 

Any mods? What year car? Type of dyno?

 

05 a4 yes cai tune and no muffler i cut them off and welded 3 in tubing in place it sounds awsome and the dyno was a dyna jet i dont know any thing else about it

 

great numbers

 

I posted this in the Z06 section:

http://www.woodcarbs.com/hpcalc.pdf[/url]
http://www.land-and-sea.com/dyno-tec...horsepower.htm

One link says 4% difference between STD and SAE. I ran the calculations using the correction formula from the other link to convert from STD to SAE conditions and came up with 4.5% (close to the first link's 4%). It should be noted that STD is also an "SAE" correction factor (J607) and the above two links are talking about engine dynos, not chassis dynos. What's referred to as SAE horsepower actually goes through a convoluted calculation where the engine is motored to determine friction HP or a 15% factor is used. Chassis dynos just use the correction factors related to weather conditions, not the whole SAE tests obviously. For a comparison, I made a chart below:

Weather.......Temperature....Humidity... .Barometric Pressure
STD/SAE J607..60°F.................0%........29. 92 in-Hg
SAE J1349.......77°F (25°C).......0%........29.234 in-Hg (99 KPa)
ECE................77°F (25°C).......0%........29.234 in-Hg (99 KPa) (European test)
Same as the SAE J1349, but does not use mechanical efficiency in the calculations.
DIN................68°F (20° C).....0%.........29.92 in-Hg (101.3 KPa) (German test)
JIS................77°F (25° C)......0%.........29.234 in-Hg (99 KPa) (Japanese test)
Uses different correction curves than the others as a substitution for using mechanical efficiency factors.
SAE J1995......77°F (25° C)......0%.........29.53 in-Hg (100 KPa) (This is the gross HP test used before 1972.)

The new SAE J2723 rating (referred to as certified HP) that the C6Z06 and many new cars are rated under uses the same test procedure as J1349 above but requires independent witnesses and all engines submitted for testing have to be within +/-1% of its' rated HP and all production engines have to be within +/-2% of its' rated HP.

Correcting to lower temperatures and higher barometric pressures will yield higher "corrected" HP making it easy to see why STD gives the highest and SAE the lowest. Also explains why the same car here (SAE J1349) is rated higher in Europe (DIN). The C6Z06 is 505 HP (SAE) here and 512 HP (DIN) in Europe because of the different correction factors...many incorrectly thought the European version got more HP.

I'm assuming your "corrected" HP is STD. In that case, your SAE numbers should be 364 HP and 378 LB-FT...that makes sense because your "corrected" hp/torque numbers have a difference of 14 also. There's no way 381/395 corrects to 370/378 because you have to use the same correction factor on both numbers.

 

Wow...you made 370rwhp in an auto with intake, no mufflers, and a tune....that's incredible

 

thanks i thought it was pretty good my self

 

Did you ever dyno stock for a comparison?

 

this is so much higher than other a6's. I don't think the cai even shows up in the dyno. Most stk a6's dyno 330 to 340 tops. With cai headers and a tune you'll see 360 to 370.

Ted

 

not completly stock cai with no tune was 344hp

 

His is an A4...do the A4s show higher on the dyno because they have a true 1:1 gear?

 

OK, Dylan got a little confused with all the numbers I was looking at on the dyno. Here is graph of corrected and uncorrected numbers. Remember He only has Vararam and Gutted Mufflers on the car. These numbers were not bad for a C6 A4 IMHO.

 

Smoothing on 3 adds 2-3hp.

 

You guys just don't give up. Can't come by and say, "Hey, nice numbers." I wend and checked it on the program. It was less than 1 hp....359.33 anything else.

 

Nice numbers for sure! How about with smooth=0

 

361.85 with 0 smoothing

 

Thanks Shawn hopefully the next time we dyno the car will have
500+rwhp
i think you are wright i will get the heads allready ported and let you port the intake
ps let me know when you decide what cam specs i should run