After looking at some dyno silps I noticed some maxima's with the same year model, transmission, and mods had different hp readings up to 10 hp in difference. Is this do to the accuracy of different dyno's or is this a result having either a fed spec or cali spec?(I thought i remember someone saying that the cali spec was a bit more restrictive due to the admission standards).

 

has to do with a variety of different conditions. Temp, humitity play a significant part. The actual dyno's are quite accurate

 

I knew the temps played a role, but i didn't know it is significant enough to give a difference of 10hp

 

There's about a zillion different variables.

- general maintenenace stuff (plugs changed, etc)
- Air filter dirty/clean
- Tire pressures consistent
- Alignment
- Type of tire
- Larger/heavier rims vs smaller/lighter ones
- Engine heat soaked or not
- different combinations of mods
- fuel quality and/or fuel formulation
- the actual dyno (there are different types of dynos)
- SAE, STD or NO correction being used on the dyno (should be using SAE)



What's important are the before and after dynos on each car. That's the true test of how a modification responds. Don't read too much into Car A with mods vs Car B with the same mods because it's a given that it's a different car, but also different dynos, probably a few things different here and there, and the dynos are different also. There's just too many variables.

 

Here is a GREAT thread on SAE vs STD correction factors...from a Zo6 board.

http://www.z06registry.com/forums/sh...threadid=40259

 

that's some good information. I'm a total newbie to interpreting dyno charts and this helps me out a little bit. Perhaps you can make this a sticky or maybe add some more info on how to interpret these charts!