Not flowing enough air...

Well I understand enough to know what you mean here, but surely this would only be a problem at low revs, not in the midrange around 3500-4000rpm? At that speed shouldn't the air in the intake manifold should have enough inertia to avoid reversion?



PS - And in reference to earlier comments about changing the VTEC engagement point and its impact on performance figures... It only follows that if your VTEC kicks in earlier then you are going to get access to that greater power earlier and for longer, meaning that your car is going to get faster. Maybe not that dramatically, but it will get faster.