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Alright...so what is wrong do ya spose?
Posted: Wed May 07, 2008 4:03 am
by 555BCTurbo
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...
Posted: Wed May 07, 2008 4:57 am
by PhyrraM
Plugged exhaust?
Did you try with nothing connected to the wastegate actuator? Maybe you boost controller is passing even when 'closed'?
Posted: Wed May 07, 2008 6:10 am
by 555BCTurbo
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...
Posted: Wed May 07, 2008 6:14 am
by PhyrraM
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.
Posted: Wed May 07, 2008 6:16 am
by 555BCTurbo
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
Posted: Wed May 07, 2008 5:54 pm
by BXSS
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.
Posted: Wed May 07, 2008 8:44 pm
by Imprezive
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?
Posted: Wed May 07, 2008 9:45 pm
by 555BCTurbo
Homemade bleeder boost controller...VF8 turbo, looking for 17ish...wastegate boost is ~7 psi
Posted: Tue May 13, 2008 5:49 am
by Arctic Assassian
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?
Posted: Tue May 13, 2008 6:20 am
by 555BCTurbo
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?!
Posted: Tue May 13, 2008 2:43 pm
by Fkyx
Hopefully that's the issue, and it isn't something else that killed your VF8.
Posted: Thu May 15, 2008 10:40 pm
by AWD_addict
Maybe the bearings were going out in the VF8.
Try a turbo without poopy pants and report back.
Posted: Thu May 15, 2008 11:29 pm
by 555BCTurbo
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
