Quote:
Originally Posted by Idaho2018GTPremium
I don't trust the dyno results because they are done with the hood up. That allows the open element to suck air from all around the top of the open box, a much larger area, whereas, with the hood down as when the car is driving around, there's a lot more restriction and air can only come from the inlet through the grille. That is the same for the factory closed box - it's taking air in from the inlet through the grille, without the benefit of the open box/hood up scenario. That's why I think these "CAIs" might show gains on a dyno, but when the hood is down, I bet most of the gains are negated.
I'd have to see a closed hood dyno to consider this a fair comparison. That, or a couple of back to back 60-130 runs in the same conditions to really compare performance gains. Do 3 runs stock and 3 runs w/ the rotofab and average the times for a fair comparison.
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Not to argue your point about the hood open, because it's just one test, but RPM did a little dyno test on this and found no real difference if I recall. I'm not suggesting this single dyno is absolute, but it was a RF. At any rate...
The car will take time to learn. Logging air/fuel trims would indicate changes in the respective systems, and likely show if the car is actually processing more air. However - I bet the TM kicks in because it seems like these cars like closing the throttle around peak torque STOCK, so just adding the potential of more flow without better tuning, makes for an improved blower whine more than realizing much power potential of the CAI. If you watch and read enough dyno runs, you might come to a similar conclusion, if you haven't already. I can tell you TM and torque tuning is real and makes a difference. And it's complex, and why you pay good money for a good tuner.