Over Boost

Ok I got my intake manifold off there is oil everywhere. So its hard for me to tell what’s what. Which hose should I be looking at as the cause of my leak? Also which hoses will the venturi delete replace or delete? And what’s that broken piece in the last pic? I’m almost 100% sure I didn’t break it, so I have been driving with it broken for some time.

lart951

That's your cycling valve and that's your vacuum leak also.

Maciek

I don't know where you're oil is coming from.

The broken piece in the second picture is the cycling valve. The end pieces are brittle and break often. I have a used but working one for sale for $50 shipped. Let me know.

The venturi delete deletes the metal pipe with the three rubber hoses running off it and simplifies the hoses down there.

What did you take the manifold off for?

special tool

because I have driven and looked at his car, and I told him to.

Maciek

ST,

I figured if you had oil everywhere and a broken CV you'd want it off, but I didn't know if the purpose was to do a venturi delete or if it was to find a vacuum leak or the oil leak.

Thanks for clarifying!

special tool

He wanted to do all those things.

Over Boost

It was for all three of those reason.

Over Boost

Since I have to replace the cycling valve is there something I can upgrade it with or no?

Maciek

Manual boost controller (or EBC) can replace the CV. I had boost spikes running an MBC in singleport with the stock wastegate, none with a dual port.

Over Boost

I would rather go with a EBC. Any suggestions?

Porschefile

Check that your air oil separator (AOS) hose is tight. My 951 was exactly like that but far worse. The 90 degree AOS hose that attached to that metal pipe wasn't even tightened down to the AOS(stupid PO!), and it was slowly but consistantly pumping oil all over the underside of the manifold. It got bad enough that my harness started to short in several spots under the manifold where it was old, brittle, and drenched in oil. Needless to say, now my harness is super protected by multiple layers of shrinkrap, loom, and a thick high-temp resistant hose used as extra large loom.

MBC's can work perfectly fine, though you have to watch out because some can be poor quality. Generally, EBC's tend to be much more consistant and good EBC's will perform better than an MBC, plus many of them have some nice features like warning modes, built in boost/vacuum gauge, etc. If you can afford an EBC, I'd go for it. Blitz makes about the highest quality EBC's IMO, and Greddy's are pretty decent as well. The HKS EVC series EBC's (they have EVC 1 through 5) tend to be a bit finicky and overpriced for what they are. I'd save the money, avoid HKS, and buy a Greddy or Blitz unit. The Apexi avc-r is a good one too, though for the money you'd be better off with a Blitz SBC-ID. I can go into more detail on individual EBC's if you'd like.

As far as MBC's, I'd try to buy a reputable brand one such as a Turbo XS mbc, or the typical "black ****" type that many retailers sell.

TRACKIN951

Since you have no other form of boost control with that part broken off, were you overboosting at all???
Dustin
PS. i also have an extra CV

Over Boost

Is that the hose that comes out the side of the AOS near the top and angles down?

Please do

Over Boost

Only once. However I did baby the car most of the time because it would smoke pretty bad out of the engine bay if I dipped into boost.

JLockton

I have a new valve if you need one cheap