At UpRev getting the 370 Tuned

semtex

Temps are part of it, but airflow is also a big (if not bigger) issue. When you have your hood open, the filter elements are free to draw in as much air as they want. But when you actually drive, you drive with the hood closed (hopefully), and with the hood closed, the air is much more restrictive (and hotter). Let me put it this way, the inlets for the G3 intake sit in front of the radiator behind the bumper cover. A test was performed (by RCZ I think) comparing dyno numbers with the bumper cover on vs off. Not surprisingly, the numbers were better with the cover off. So we have the same principle at play here. Air flow is going to be more restrictive with the bumper cover on than it will be off. So dyno numbers with the bumper cover removed are going to be somewhat elevated -- "invalid," if you want, because we drive with our bumper covers on, not off.

Regarding the car in motion and how that affects airflow, yes airflow will be better with the car in motion. That's why dyno shops typically aim huge fans in front of the car during dyno runs -- to simulate driving conditions as much as possible.

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"There are no small accidents on this circuit." -- Ayrton Senna
316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.