Quote:
Originally Posted by P's_Z
I have so much to learn 
On the other hand, i will read up some more on your suggestions guys 
One of the things i was afraid of was what synolimit mentioned, and its a dyno shop trying to make me "happy" with higher numbers. But just like i was telling jordo and synolimit was saying, im happy with how the car feels, so thats whats important, and not the hp/tq my cas has. Ill have to try my luck on another dyno like a dynojet to see what kind of results i get. I always opted for a mustang dyno for this same reason, and that was thinking that i would get a real number and not a higher unrealistic number or result. Guess i didnt do a lot of research, but again, i have a lot to learn.
PS i love this forum and the helpful people here  thanks!!! |
It really comes down to measurement variance; dynojets have less in the way of specific calibration options to enter, so you tend to see less variance between different units -- that's really the only reason I like it so much, but it's an important reason because it minimizes uncertainty in interpreting the effects of various mods.
The only real "fudge factors" on a dynojet are the correction factor used (I tend to view SAE as a "lower bound" and STD an "upper bound"), the weather data used by the dynojet software to calculate the correction, and, finally, the actual weather, including air pressure (and BTW, no correction factor can perfectly compensate for this).
As to the car itself, oil temps, fuel trims, knock sensor response, gear used for the run, air temps, and coolant temps, and good old fashioned wheel slip all create some measurement variance.
That said, if one tries to keep oil and air temps consistent, uses the same gear for each run, is aware of how quickly the ECU can approach target fueling (usually about 3 runs to redline, or so it seems), and makes sure the tires aren't slipping, you will still see remarkable consistency in dynojet readings across units.
That sort of sounds like a lot to keep in mind when measuring things (and it is), but so long as you do keep these ideas in mind, interpretation becomes far easier and clearer.
I have ton's of dynos posted that show differences in gear, effects of weather, etc floating around on here (especially the so-called "Proven Power Dyno Thread") as well as in my picture gallery.