RB25 Manifold Gasket issue

[ADM33T]

Hi all,

Looking for some feedback before I head down the expensive road of ripping off my exhaust manifold.

So I upgraded the std snail to a hypergear ATR43SS2 with relevant supporting mods, so far I have managed 16psi out of it, hit a brick wall due to slipping clutch on dyno and some other small issues, so a majority of the issues are all fixed bar one that is really driving me nuts as I want it sorted before it goes back on to crank it up.

So I'm having issues with the gaskets that sit between the spacer and the manifold, so far have gone through three different type of gaskets that all just keep blowing out, one lasted about a week with relatively easy driving, one two days then the other about two weeks.

I've been told numerous fixes / could be caused to the issue.

The last resort is rip it off and check the surface of the manifold then if all fine to have it welded, I'm a little reluctant to pull it off as I know il be up for re-tapping the bolts etc etc.

Wondering if anyone has any feedback.

[Borci88]

Your manifold is probably warped 

[ADM33T]

Had it for about 7 months running standard... but yes I've been told that also.

[R_34]

Manifold or spacer warped yes.

[ADM33T]

New spacer on the way [emoji106]

[V28VX37]

Random observation but the manifold spacer supplied with my ATR43SS3 is noticeably thicker than yours:

Maybe check with @hypergear which one it's meant to be, and/or if the thickness matters at all?

[ADM33T]

Ummm from memory it had to be a minimum 10mm spacer so I went with that option.

Yeah might pay to ask them I guess.

[Griffin]

I never run a gasket between turbo or spacer and never have problems.

[89CAL]

Thickness wont matter at all. Its the sealing quality of the surface that will make the difference. Pull it off and have a look at the witness marks left behind to see if that shows anything

[ADM33T]

Due to pull it out soon, might try the "no gasket" and see how it goes.
Will see how it all looks along with a new spacer as well

[89CAL]

I would say if you are blowing gaskets, you arent going to fix it by removing the gaskets

[Borci88]

It'd cost you like $50 bucks to have the manifold and the spacer plate decked to be sure they were straight, cheap insurance.

[ADM33T]

Hey Borci88

A contact of mine mentioned that today.
It's just doing my head in for something that should be so simple.
But I guess when we start modifying it should be expected.

[GTSBoy]

5 hours ago, ADM33T said:

It's just doing my head in for something that should be so simple.
But I guess when we start modifying it should be expected.

It's not really that you've modified anything.  It's not as though you're running monster exhaust manifold pressure.  But if you try to slap a slab of steel between 2 other surfaces and don't ensure that all 4 faces are straight and true (and collectively parallel!) then you're spinning the roulette wheel.

[ADM33T]

It's not really that you've modified anything.  It's not as though you're running monster exhaust manifold pressure.  But if you try to slap a slab of steel between 2 other surfaces and don't ensure that all 4 faces are straight and true (and collectively parallel!) then you're spinning the roulette wheel.

The other issue I guess is that il have to keep approx $400 aside for when I snap a bolt to get off, everyone I have spoken to has said that the bolts will def snap.