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lilcrash

By lilcrash,
in Engines & Forced Induction

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GTScotT Grand Master

GTScotT

Posted
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Can you confirm a couple of things...

When you pressure test the system, u remove the afm and put in ur test fitting. That means ur intake pipe is in the pressure system, yet has non pressure areas being compressed. Ie your bov pipe and presumably the breather hoses that go from the ex rocker to the intake pipe, yes?

To rule that out please do the test on the system post turbo instead of pre, and make sure ur motor is on TDC. Then work ur way thru to see where its leaking, work forwards... So from there go to ur cooler entry, cooler exit, crossover pipe, throttle body. Work forward until u track how far the leak is into the system.

Ur breather shouldn't need ur finger put over the gromit, that means ur pressurizing ur sump... Obviously from the ex rocker breather via the intake. Otherwise ur PVC is ficked too. Test this before anything else.. Then test the guys infinite boost (blocked actuator) theory and see if it can actually make that boost up high when it cant possibly bleed it off.. If it can do it then u know the issue is boost control (actuator/wastegate arrangement).

Report back and well all help from there.

lilcrash Veteran

lilcrash

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Posted

Yes that's how I've always done it, it did blow my intake pipe off once, took 2 hours to get it all back on and ready to test again. My bov does have a tiny little leak on the outlet side between the bov and the pipe adapter, not a problem during running. I no longer have the pipe that goes to the intake pipe from the tappet cover, that's the pipe I put my finger in. You can see it in the photos.

lilcrash Veteran

lilcrash

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it will make over 20psi at 6500rpm, hard to hold it steady there without going stupidly fast. so i crept up to 6500rpm at between 15 and 20 psi then i put my foot down a bit quicker to see if it would make 25. not sure if this is a deffinative answer but makes me feel better. so new actuator and new tune and my car should be fine, hopefully the heat soak issue will be resolved with the tune. thanks everyone.

pipster11 Grand Master

pipster11

Posted
Posted

whats running to your p/s pump if your using that as a boost source?

is the p/s side blocked off?

did you use new hose for your boost to wastegate feed? one of the factory lines has restrictors in it

DVS JEZ Grand Master

DVS JEZ

Posted
Posted

DVS can you pm me a prIce on a retune please.

Thought i did buddy, ill send u another one.

Let me know how u go with the new actuator, more preload, and put the boost source for the actuator in the cooler pipe just out of the turbo.

SargeRX8 Grand Master

SargeRX8

Posted
Posted

it will make over 20psi at 6500rpm, hard to hold it steady there without going stupidly fast. so i crept up to 6500rpm at between 15 and 20 psi then i put my foot down a bit quicker to see if it would make 25. not sure if this is a deffinative answer but makes me feel better. so new actuator and new tune and my car should be fine, hopefully the heat soak issue will be resolved with the tune. thanks everyone.

How long ago in that HG thread did I say it was the actuator lol.

This IS a definitive answer. Your car made more boost at points it never could when you eliminated the actuator from the equation. Done and done. Get that new bitch on her and enjoy.

lilcrash Veteran

lilcrash

Posted
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Sarge. I did believe you but I didn't have a safe way to test it, that's where my wife comes in handy.

There isn't any boost feed going to the ps pump, I used new vacuum line to the turbo.

Yer I deleted it by accident and couldn't remember what you said.

lilcrash Veteran

lilcrash

Posted
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Posted (edited)

That's the vacuum valve on a neo rb25. That's what I took the line off, il trace the other line and see if it's causing a leak.

Edited by lilcrash
MBS206 Grand Master

MBS206

Posted
Posted

I thought the Hypergear turbos had a nipple on the outlet of the turbo already for that purpose...

If not, do as Jez has said and put a brand new nipple on the intercooler pipe, nice and close to the turbo.

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