Quote:
Originally Posted by mr220v
You could potentially use the money you'd save on a 6speed, and put it towards a power fc. Put the engagement point down around 4500rpms where it should be.
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Whoa!!! Doug, 4500 is wayyy too low to set the change-over. You wouldnt want to run it that low unless your running forced-induction. And its not just as simple as dropping the highcam engagement, you also have to coinside the variable valve timing too. Its not a simple feat. Some power has been made by dropping to 57 or 58k, come to think of it... I think someone has effectively done a 5500 change-over (w/ VVT-i changes too).
IIRC it was about a 20-25 whp improvement and they netted an additional 12-16ish. Dont hold that as fact, but I believe it was somewhere in this neighborhood.
The only reason you would ever want to make the change-over that low is to open the valves earlier for better breathing when you've added the forced induction and making a smoother, more linear hp curve.