Stock plastic upper intake manifold boost limitations?

Originally Posted by bullitt5897 20psi is where you start to see issues. I have seen them crack as low as 21psi . Once your over 20psi it's not of matter

		Nissan 370Z Forum > Nissan 370Z Tech Area > Engine & Drivetrain > Forced Induction
Stock plastic upper intake manifold boost limitations?

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03-14-2017, 10:23 AM

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Chuck33079

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Quote:

Originally Posted by bullitt5897

20psi is where you start to see issues. I have seen them crack as low as 21psi. Once your over 20psi it's not of matter of if but rather when it will crack. The highest I would run a stock manifold is 25psi and even then it's playing with fire.

That low, huh? I guess my definition of "low boost" is miles away from some people.

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