Quote:
Originally Posted by Warrtalon
Hmm, that's contrary to what tuners say, but it's more likely that I misinterpreted the explanation or that I am just not remembering it properly. Whatever it is called, there is an event around 6k that causes us to need to fatten it up just a little. I've also witnessed how 10 straight Evos all spit out a puff of black smoke right at 6k, but it wasn't evident in the hp/tq curves, nor the AFR or boost curves. Whatever it is that causes that is what I'm referring. I had been told it was peak cylinder pressure, but maybe it's something else.
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It probably is the RPM range where intake valve and exhaust valve overlap causes some kind of resonance in the intake manifold affecting the tune... I bet you it is the RPM with the highest
exhaust manifold pressure, and the tuners add fuel for cooling purposes to compensate for reversion which may cause high temperatures in the cylinders.
This is just speculation, but does it sound like what you may have heard from the tunner?
Keith
