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Forced Induction Forum
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Old 07-26-2013, 10:05 AM   #1
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Stock S54 Intake Plenum for Boost

I've searched and searched, both Google and other forums, but can not find any definitive answers as to specifically where a failure occurs on the stock S54 intake plenum due to over pressurization. Is it a catastrophic type failure such that the whole plenum basically blows a hole in it, or is it more like splitting at the production seams?

Any ideas on the best approach at reinforcing failure prone areas to handle between 14-16 psi boost?

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Old 07-26-2013, 11:14 AM   #2
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In m opinion I Would just buy one designed to handle boost. Why risk it? With the amount of time and money to make the stock one stronger, I'm sure you can buy one designed to handle the pressure.
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Old 07-26-2013, 02:30 PM   #3
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I don't even think it will handle 6-8psi safely.
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Old 07-26-2013, 03:32 PM   #4
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We ran 9psi with a stock one and it failed. We then modified and reinforced one and it held together. The next issue is keeping it clamped on at that boost level.
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Old 07-26-2013, 03:48 PM   #5
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1. The stock plenum wasn't designed for any vacuum or boost.
2. Do a rough calculation of how many square inches there are on just the top surface of the plenum. Multiply that number by just 10 psi; the product will be how many pounds of force on that surface.
3. Realize you're putting an absurd amount of stress on some plastic that wasn't designed for anything other than separating some filtered air from unfiltered air.

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Old 07-26-2013, 04:09 PM   #6
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It will leak.

It wont have a proper blow off valve installation.

Just buy an intake manifold.
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