S2 ultra street Mani, IACV bypass on TB help
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S2 ultra street Mani, IACV bypass on TB help
So I found my vacuum leak since I put on the new head and S2 Ultra intake, its the bypass for the IACV on the throttle body. The opening on the manifold is 74mm and I'm using a GSR tb Maxbore opened up to 64mm. Well, the inlet on the IM is large enough the gasket won't seal and allowing vacuum to pass by. I looked at a spare Omni 68mm I have for a friends build and it still has that bypass, but not sure if it will be wide enough to seal rather. Any thoughts on an affordable 68mm tb I can get that will work?
#2
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Re: S2 ultra street Mani, IACV bypass on TB help
So I found my vacuum leak since I put on the new head and S2 Ultra intake, its the bypass for the IACV on the throttle body. The opening on the manifold is 74mm and I'm using a GSR tb Maxbore opened up to 64mm. Well, the inlet on the IM is large enough the gasket won't seal and allowing vacuum to pass by. I looked at a spare Omni 68mm I have for a friends build and it still has that bypass, but not sure if it will be wide enough to seal rather. Any thoughts on an affordable 68mm tb I can get that will work?
Last edited by wunfstgsr; 12-18-2014 at 03:39 PM.
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Re: S2 ultra street Mani, IACV bypass on TB help
#4
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Re: S2 ultra street Mani, IACV bypass on TB help
I would highly sugest the Pro seies manifold for your aplication with a nice port and polish i bet you would benifit more from that manifold, The ultra street manifold is more beter suited for a higher comp with biger cams and a better flowing or ported head. Not to say you couldnt use it its your probally not going to ever use its full potential if your not going to even match the throtle inlet.
#5
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Re: S2 ultra street Mani, IACV bypass on TB help
So I found my vacuum leak since I put on the new head and S2 Ultra intake, its the bypass for the IACV on the throttle body. The opening on the manifold is 74mm and I'm using a GSR tb Maxbore opened up to 64mm. Well, the inlet on the IM is large enough the gasket won't seal and allowing vacuum to pass by. I looked at a spare Omni 68mm I have for a friends build and it still has that bypass, but not sure if it will be wide enough to seal rather. Any thoughts on an affordable 68mm tb I can get that will work?
So I used adapterplate and I can port it what size ever I want.
Unfinished but ready.
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Re: S2 ultra street Mani, IACV bypass on TB help
That's awesome. It crossed my mind to do that but I don't have access (or skill set) to tools to make a plate.
#7
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Re: S2 ultra street Mani, IACV bypass on TB help
Material measurements for base are 4"x4" and approximate 0.4" thick (it's not flex so much). Then draw outlines on it by using tb-gasket and the rest is just a drilling and filing.
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Re: S2 ultra street Mani, IACV bypass on TB help
I just ordered a larger throttle body. Probably overkill, but it was on the list later anywho. I'd still like to make an adapter plate and see what kind of differences the 64mm to 70mm does on a dyno when I finally make it to one.
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