2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

s4 na intake to s4 turbo manifold swap

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Old May 12, 2007 | 09:19 PM
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86fc3sred
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From: Boylston Ma
s4 na intake to s4 turbo manifold swap

I was wondering if you can swap a s4 n/a lower and upper intake manifold with a s4 turbo manifold?
Thanks Alan
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Old May 12, 2007 | 10:23 PM
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No. The turbo is 4 port and the NA is 6 port. I think you can enlarge the ports on the turbo manifold or something but it doesn't work well at all.
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Old May 13, 2007 | 12:31 AM
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why would you want to put a N/A intake on a turbo car?

But as the person above said.. the turbo is 4 port.. the N/A is 6 port. with the N/A manifold.
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Old May 13, 2007 | 12:35 AM
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Even if you messed with it enough, the turbo would not clear.
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Old May 13, 2007 | 10:02 AM
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Yes, if you port match the lower intake.
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Old May 13, 2007 | 10:15 AM
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Like the fellow abover said, you have to rework the turbo manifold to match the ports on the n/a engine.

You can take the metal gasket of the n/a and lay it on top of the turbo manifold to get an idea of how much metal on the turbo manifold will have to be removed to match the n/a ports.

And another thing is once you lay the n/a gasket on the turbo manifold, you'll realize you need to FILL IN some void areas on the turbo manifold. I used melted/molten metal to fill them in. Others use??? JBWELD or something similar. I was too chicken to use JBWELD.

Using a turbo manifold means there will be no fit problems with the turbo.

No one is really interested, but you could keep the ACV functional by popping out what looks like a round freeze plug on the intermediate housing and then shape the round hole on the intermediate housing to mate with the RECTANGULAR hole on the turbo manifold. That's the hole just below the two oval inlet holes on the intermediate housing.
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