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Old 11-25-2012, 01:03 AM   #537
Scooby Guru
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
2002 WRX - 750WHP
9.5s @ 150mph


I need to catch up on reviewing these videos...

But for tonight, I just have a little comparison. Nothing scientific, but it might help people gauge what time they should expect if they have Virtual Dyno numbers. I did some runs at 20psi (flat), 24psi peak (tapering to 22psi), and 27psi peak (tapering to 24psi) and then plotted the results in Virtual Dyno:

I took speedo videos for these runs and the 50-100mph times were as follows:

20psi (400WHP Dynojet): 5.4 seconds
24psi (440WHP Dynojet): 4.9 seconds
27psi (480WHP Dynojet): 4.4 seconds

All of the runs were done twice (once in each direction) and the results were identical (peak numbers within 2WHP in Virtual Dyno and 50-100mph times within 0.05 seconds in the videos), so I think the results are pretty solid.

Of course this is just my car, with my powerband, and the runs were done all in 3rd gear. There will be different results once you add in one (or two) shifts, as well as many other factors. So take it with a grain of salt, but I'm just glad to see the VD numbers do seem to go up inline with the 50-100mph times going down.
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