Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum - View Single Post - Journey to hit 430+whp with a T28...Lets find out.

codyace · 04-07-2010, 04:06 PM

On the OEM manifolds we source right off the top of the manifold, venting cylinders 1 and 4 only. Never had an issue, and even never even a heat difference when checking with a thermo gun.

Sure it sounds wrong, and it may be for a professional race car, but you gotta thing, it's almost 'venting' in both aspects...as when that gate opens you're not loosing any boost ya know? I can see what you mean by allowing lets say 1-4 to breath freely as it's venting, but when the other two cylinders aren't fighting the backpressure from the other two, wouldn't they flow also the same?

04-07-2010, 04:06 PM	#131
codyace Post Whore! Join Date: Dec 2004 Location: Poconos, PA Age: 39 Posts: 8,030 Trader Rating: (58)	On the OEM manifolds we source right off the top of the manifold, venting cylinders 1 and 4 only. Never had an issue, and even never even a heat difference when checking with a thermo gun. Sure it sounds wrong, and it may be for a professional race car, but you gotta thing, it's almost 'venting' in both aspects...as when that gate opens you're not loosing any boost ya know? I can see what you mean by allowing lets say 1-4 to breath freely as it's venting, but when the other two cylinders aren't fighting the backpressure from the other two, wouldn't they flow also the same? __________________ *Want Air Conditioning in your SR20 Swapped car? Check out www.sr20acbrackets.com for more information! Quest Alternator Conversions for SR20!* Check my Group Buy! Tired of lousy internal gates? Go external wastegate with one of my manifolds, Check out my group buy