2018/GT350 intake manifold max boost?

[Falkazor94]

Title. Cant find a reliable answer.

Id heard people saying not to go over 15pounds on the 2018/gt350 stock manifold and even lower boost on a ported one. I don't think that is correct but I cant find any data anywhere to disprove it ether.

What have you all heard?

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[andrewtac]

@beefcake i think has been 25+ on a ported 350. Ive been 19ish on a stock 18 and plan on 25+ on a 350.

 

[80FoxCoupe]

I've been 25+ on a ported 2018. No issues. I have seen some LS manifolds blow open on much lower boost pressures, but keep in mind those manifolds are 20yrs old and heat cycled a million times. I'm sure the epoxy and polymer gets brittle over time.

Imagine a polymer manifold exploding under boost, rails and injectors become dislodged, fuel everywhere.... Not to say that is common with coyotes but it's possible. That's why I went aluminum.

 

[andrewtac]

It is in my future upgrade plans for sure.

 

[Falkazor94]

I've been 25+ on a ported 2018. No issues. I have seen some LS manifolds blow open on much lower boost pressures, but keep in mind those manifolds are 20yrs old and heat cycled a million times. I'm sure the epoxy and polymer gets brittle over time.

Imagine a polymer manifold exploding under boost, rails and injectors become dislodged, fuel everywhere.... Not to say that is common with coyotes but it's possible. That's why I went aluminum.

That thing looks awesome. What manifold is that?

 

[80FoxCoupe]

That thing looks awesome. What manifold is that?

It started life as a Edelbrock Victor. Top cut off, ported, new lid etc

 

[Unas2k5]

I’m making about 21 psi on a gen 3 manifold no issues

 

[Proshop]

I've been 25+ on a ported 2018. No issues. I have seen some LS manifolds blow open on much lower boost pressures, but keep in mind those manifolds are 20yrs old and heat cycled a million times. I'm sure the epoxy and polymer gets brittle over time.

Imagine a polymer manifold exploding under boost, rails and injectors become dislodged, fuel everywhere.... Not to say that is common with coyotes but it's possible. That's why I went aluminum.

I’m with you I’ve put a good amount of boost through my factory one but will be upgrading for peace of mind!

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