zip tie them open, go drive. youll be like, WTF whered did my tq go.

The idea behind runner lengths is wave rebound theory, that when the intake valves open, a pressure wave is sent backwards up the runner to the plenum where it bounces back and ultimately combines with the incoming air charge causing a sort of supercharge effect as it increases in incoming pressure.  This happens when the piston is at it's critical point, midway down in the stroke, and the effect is harmonic in nature, so you typically have one 1st harmonic rpm where the frequency of the valves opening and shutting, and the resulting pressure wave/rebound happens at the point where it will return to the cylinder at this exact moment.  Longer runners cater towards this harmonic happening lower in the rpm band, while shorter runners cause the harmonic to happen higher in the rpm range.  It is extremely repeatable if you are ever in the position where you can see custom manifolds tested on a dyno.  The idea behind your butterflies is that you have the best of both worlds.  If you take them away, then you will lose that low rpm gain as you will no longer have the air charge solely traveling down the longer runners.  People here remove them because of the potential for the screws holding the butterflies on being sucked into the engine, but I don't really see much point in doing it otherwise.

Last edited by 16g-95gsx (2008-10-21 19:29:46)

ok so the butterflies open up at high rpm's right? so can thir be a way to acctually make the butterflies open up a bit sooner to get that extra air in the motor when its accually needed and have them colesed at low rpm's at once????????????????

For about $50 you can make your secondaries open whenever you want:

http://myspecv.com/f/t166367-how-to-set … sheet.html

I'll be doing this within the next week once I buy a decent soldering iron.