I know there's many talk about what will happen if you keep the butterfly open and so on. you lose power at the low end, but relatively the same on top. Since I have a spare manifold lying around.. i was thinking about applying the concept of ITB to it.

If I keep my primary unaltered. I wont lose low end.

but what if I can open the butterflies to the atmosphere. To do this, you'll have to cut the back piece in half and weld a plate to seal off the chamber for the primary. The secondary instead of breathing the same air that is coming from the stock TB, it will be getting air from another source, each flap with it's own openning and maybe a filter that sits under the manifold somewhere. Therefore, in theory, when secondaries open, it's like having ITB. will this screw up the sensors? I don't see any holes for sensors pass the butterflies so I don't know if that would be a problem.

I came up with this because I have always loved ITB, but it's just too loud and idles funny. not great for street use. but if this works, I wouldn't mind having an extremely loud car if i can keep it subtle during low rpm driving such as a commute.

thanks... flame away!

 

anyone?

 

If you're trying to use the secondaries themselves as ITBs, I don't think it will work. I don't believe that they have that kind of control. They're either open, or closed, and not linked to the throttle.

 

i just think that the all open or closed nature of the secondary isn't the real problem to this whole idea. I think that what will be a problem is when you are off the throttle, the secondary butterfly might still be open if the rpms are above 5750rpm, which means the engine will see a massive amount of air going in when it's not supposed to?