Quote Originally Posted by Lankhoss
Couple of things I'll throw in here. P:W ratio is the best thing to look at to accurately guess which vehicle is going to be faster from a roll, and is almost always the determining factor. However, there are a LOT of variables. You have gearing, aerodynamics, powerband, and dyno discrepancy to look at. 2 things that most people usually overlook are what a car's powerband is, and that a dyno number from shop A does not equal a dyno number from shop B. If you peak at 210hp, but only make that hp for 200 RPM's, and drop away from it very quickly.....that car may be slower than a car that can make 200hp for 600 - 700RPM's. Also, dyno's are all over the place. Even with correction, different days can give different numbers. If one car got completely cooled down and had a huge fan on it, that may make 10 or 15 more than a car that was still hot and didn't have as much cool air blowing on it. There are also no 2 dyno's that read the same. My car has been dyno'd at just over 500rwhp from the shop I got my work done at. However, I have taken it to a few dyno days and I literally have NEVER seen my car make 500 in person. Highest I've seen was an uncorrected 488 with a shop temp of 50 degrees (would have been lower if it was corrected). But when I'm on the street, people claim my car MUST be making more than 500.

Point being....the only accurate dyno, is the street dyno. That's the only way to settle this!
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