locoboi757

kinda dumb but just wondering, if there is a benefit from the secdondary butterfly or is it better to disable it or leave it open some how?

Enigma

I think it helps with low-end torque.. talk to hart-n-sol.. he knows his honda ish

sil80er

it is a popular mod for rx7's being that it is free. the reason i did it is because my secondary butterflys are opened and closed by a vacuum. when you hit the throttle you still need to wait for the vacuum pressure to open the secondaries all the way so by removing them you get better throttle response.

locoboi757

im just wondering if i keep it closed during high revs or open, which one will give me the greater benefit til the manifold is replaced

swtch7

you want it open for high revs, and closed for low. The reason is because with them close at low end, it makes the air take a longer route through the intake manifold providing more torque. Now what sil80er was saying may be true aswell. but having them open at high rpms decreases the length the air needs to travel providing more HP.

mischiefse7en

You don't want them open all the time. Thats not good. People have dyno tested it before and shown power loss. Check honda-tech for secondary butterflies, or IAB, and see.

EEK

get rid of the secondary butterfly..why do you need two stages of vtec

S dot Camp

I would have to agree with the two above posts. You don't want the secondary runners open at all times. Your low end will suffer, specially if the motor is close to stock form. It's not worth the trouble in my opinion.

mischiefse7en

If you don't want the IABs, just get a Skunk2 IM. Thats about your only choice. And mine are open all the time because i have a p28 ecu, its a dog below about 5800rpm.

SCOOBY STEVE

skunk2 mani