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Greddy Plenum Loud Howl?

skeg_man

By skeg_man,
in Engines & Forced Induction

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skeg_man Enthusiast

skeg_man

Posted
Posted

Hi all,

Recently did the greddy front plenum change on a R33 gtst and I seem to have come across a problem. When the car gets up to around 7-8 psi of boost (upgraded turbo) there is a loud howl from the intake plenum...

Ive done a vacuum leak test with a compressor and cant seem to fund any leaks???

Is this sound caused from a higher rate of air flow due to being a front facing plenum or something more to it?

The car doesnt idle funny or anything. Seems to build boost fine. Altho I havent been going above the 8 psi at all.

Any info would be great.

Cheers

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https://www.sau.com.au/forums/topic/371980-greddy-plenum-loud-howl/
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GTSBoy Grand Master

GTSBoy

Posted
Posted (edited)

I'm guessing you have a boost leak rather than a vacuum leak. Same thing of course, except in this case it's something that's opening up when it gets pressure inside it. Not necessarily the gasket faces or anything, could just be a hose clamp. Need to get it on a dyno perhaps so you can see it / hear it leaking under load.

--edit -- beaten to it.

Edited by GTSBoy
skeg_man Enthusiast

skeg_man

Posted
  • Author
Posted

Oh ok. No real way of checking for the boost leak at home?

Im fearing having to take the plenum off. Lol. Was a pain in the arse to get it on. If it has to be done tho. Better off doing it sooner then later i guess.

Cheers guys

TiTAN Grand Master

TiTAN

Posted
Posted

friends landcruiser had the same problem, drove fine idled fine but whistled on boost, turned out one of the gaskets on the intake manifold wasnt sealing quite right under boost.

pull them all off and go over them with some hylomar then put it back together.

skeg_man Enthusiast

skeg_man

Posted
  • Author
Posted

Yeh, I've gone over the whole system. Double hose clamped some connections too.

Really don't want to remove it again. Like I said before, pain in the spank.gif!

I'm just kinda confused. I thought if you put pressure in the plenum you could find the leak like that?

Adriano Grand Master

Adriano

Posted
Posted (edited)

From what i have seen, all the Freddy manifolds needed machining to get the flange flat, however if you were able to get the piping up to 10 psi, it should have shown up. Try spraying some carby cleaner around the gaskets when it idling to see if there are any leaks, the idle will go up or down.

Edited by Adriano

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