Alright...so what is wrong do ya spose?

555BCTurbo · Post by **555BCTurbo** » Wed May 07, 2008 4:03 am

So...my SS has been having boosting issues for quite a while now. I thought maybe the turbo was bad, but I disassembled it and found it to be in great shape. The symptoms are that the turbo will only make wastegate boost, even with the boost controller closed completely.

So far I have replaced:

Uppipe
AWIC
AWIC inlet pipe
Turbo (tried a TD04, did the same thing)
Vacuum hoses
Removed/Resealed Intake Manifold
Changed silicone between AWIC and throttle body

None of these things helped. I am out of ideas...

PhyrraM · Post by **PhyrraM** » Wed May 07, 2008 4:57 am

Plugged exhaust?

Did you try with nothing connected to the wastegate actuator? Maybe you boost controller is passing even when 'closed'?

555BCTurbo · Post by **555BCTurbo** » Wed May 07, 2008 6:10 am

Yeah...tried the wastegate thing a while ago...no worky

And I just built the exhaust a few weeks ago...and it had the problem beforehand...

PhyrraM · Post by **PhyrraM** » Wed May 07, 2008 6:14 am

If your can't get more boost and your sure the intake and exhaust are free flowing, I can only suspect the turbo itself.

The bypass valve leaking?
The engine itself dieing and can't push the turbo anymore?
Triple check for intake and exhaust leaks?

Out of ideas, I guess.

555BCTurbo · Post by **555BCTurbo** » Wed May 07, 2008 6:16 am

I changed the bypass valve to a Bosch one...so I have pretty well ruled that out...

As far as intake restrictions, I don't think there are any.

I haven't cleaned my K & N for a while...but that wouldn't yield these kinda results methinks

BXSS · Post by **BXSS** » Wed May 07, 2008 5:54 pm

I'd say a boost leak.

But

This past weekend a friend of mine had a similar problem with a turbo'd KA24 in a 1977 Datsun B210.
He swappped turbos & WGs but still had the problem, then he swapped boost gauges as the turbo could be heard spooling.
Turns out the boost gauge would register Vac but would not register boost.

Imprezive · Post by **Imprezive** » Wed May 07, 2008 8:44 pm

what boost control are you running? What boost should you be expecting? What turbo are you using?

What is your watsegate boost? 5psi or 9psi?

555BCTurbo · Post by **555BCTurbo** » Wed May 07, 2008 9:45 pm

Homemade bleeder boost controller...VF8 turbo, looking for 17ish...wastegate boost is ~7 psi

Arctic Assassian · Post by **Arctic Assassian** » Tue May 13, 2008 5:49 am

It hasn't been said yet, and I've seen it at least twice... Have you checked inside the intake tract for a rag, or some restriction like that?

555BCTurbo · Post by **555BCTurbo** » Tue May 13, 2008 6:20 am

Arctic Assassian wrote:It hasn't been said yet, and I've seen it at least twice... Have you checked inside the intake tract for a rag, or some restriction like that?

Yeah...I did

Update: the VF8 shit its pants the other day...so that could have been the issue?!

Fkyx · Post by **Fkyx** » Tue May 13, 2008 2:43 pm

Hopefully that's the issue, and it isn't something else that killed your VF8.

AWD_addict · Post by **AWD_addict** » Thu May 15, 2008 10:40 pm

Maybe the bearings were going out in the VF8.
Try a turbo without poopy pants and report back.

555BCTurbo · Post by **555BCTurbo** » Thu May 15, 2008 11:29 pm

AWD_addict wrote:Maybe the bearings were going out in the VF8.
Try a turbo without poopy pants and report back.

Non-poopypants turbo arrived today

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Alright...so what is wrong do ya spose?

Alright...so what is wrong do ya spose?