Ok ppl I think my friend is talking out of his *** again but who knows maybe hes right. He says only on GSR and H22's when vtec kicks in there is a second air bypass valve that lets more air in. But on most swapped h22 and gsr they vacuum it and screw one of them and you lose low-end torque or high end hp depending if they vacuumed it or not. So he said his friend with a delsol with an h22 his was vacuumed so he bought a bypass thing for it but you gotta plug something in the computer and supposedly there is an empty spot for it? This bypass piece cost him 50$. Can anyone understand any of this cuz I'm confused. Supposedly its located on the intake manifold, I have no idea if this makes any sense to you guys but i'm stumped as hell.


Modified by EM2Civic at 5:07 AM 10/4/2004

 

im not sure about the h22 but the gsr has the butterfly plate/valve(whatever you want to call it) in the intake manifold. search for 'butterfly'

 

The secondary runners are also called IAB for intake air bypass. The long runners of the intake manifold are good for lower rpms. The secondary (short) runners are closed with little butterflys (look like throttle plates). At higher rpms those secondaries open up to let air thru the shorter runners.

If you're not using an ECU that knows how to control the IAB butterflys, then you either lock them open or lock them closed.

 

So it should be open if you have the right ecu? Are there any gains to this? I heard of ppl removing them but only when they are boosted. N/A any gains?

 

If you're NA you'll want them working. At lower rpm you make more power with them closed. Higher rpm you make more power with them open. That's how Honda chooses the rpm point where they're supposed to open.

 

that's correct JimBlake

 

check pm

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">The secondary runners are also called IAB for intake air bypass. The long runners of the intake manifold are good for lower rpms. The secondary (short) runners are closed with little butterflys (look like throttle plates). At higher rpms those secondaries open up to let air thru the shorter runners.

If you're not using an ECU that knows how to control the IAB butterflys, then you either lock them open or lock them closed.
</TD></TR></TABLE>


well said Jim