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Originally Posted by sperry
In reality, I would say anything +/-20hp on a dyno is pretty much similar enough to write off as "the same". On the track the faster car between Matt and Dean will be based on the driver, not the dyno'd hp. Trying to figure out vf39 vs. vf43 based on the data in this thread is a waste of time. According to the data and the margin of error involved, the turbos are equivalent. Same goes with all the rest of the differences between Dean and Matt's cars.
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I think you and I are agreeing here, but I came at it in a different way.
With statistical analysis you could detect small changes or differences, but the sampling size would be large - maybe like dyno'ing both cars 10 or 20 times.
The best practical measure of "real-world" horsepower at the wheels is to run the car on the dragstrip several times and watch the trap speed (not the ET). Trap speed is a good indicator of HP because the gearing, tires, and a relatively competent driver have little to do with it, but power does. Here again though, it takes a sample size of maybe 10-20 runs to see small changes.