0 PSI of boost....PLEASE READ

Boosted4 · Sep 10, 2003

Ok, first off. Relative mods I Run are FP GREEn, Tial Hybrid External Dump, greddy type S bov, and S-AFC and hallman MBC
I went to the Doctor, and car was boosting fine, when i got in car leaving, my car wouldnt boost, and hasnt since then. I am getting 0 psi. I dont hear any boost leaks, I figure one big enough to cuase me to produce 0 boost would be pretty loud. I do not here my wastegate dumping any exhaust, which is also loud. Nor do I here my turbo spooling. I pulled off intake, and turbo has no shaft play, and it spins freely. I checked Karman readings via S-AFC, and thats registering, so its not that my MAS is broken. I cant figure out what this could be. I will double check for a huge boost leak today, but im sure i would still here my turbo spooling, and exhaust dumping. IS it possible MBC is stuck? or broken? Somebdy reccomeneded i check bov, but if it was my bov, i would still here turbo spooling and exhaust dumping right? Any info would really help Thanks

Stephen · Sep 10, 2003

Wow, that is wierd... even if the mbc got stuck you would boost, or not boost and hear the wastegate...

Boosted4 · Sep 10, 2003

anybody else? im dying here

noreaga0221 · Sep 10, 2003

start the car with the intake off and watch to make sure the compressor wheel is spinning. it sounds almost like you lost your turbine wheel

:dunno:

also is the car def. alot slower?

tsitalon92 · Sep 10, 2003

In his first post he said he can spin the wheel freely... so it must still be there...

Boosted4 · Sep 10, 2003

well while im checking for boost leak, i mays well satrt it and see if turbine wheel is spinning....should it spin at all at idle?

Mo-Bo0st · Sep 10, 2003

Compressor side may be there, but if the exhaust side was "missing" it wouldnt be spining.

However if that were the case I think the cause would have been an event he definately would have noticed.

Boosted4 · Sep 10, 2003

yeah i think that would have made a big noise or something, but its entirely possible, guess when all else fails, i take the exhaust manifold off.

noreaga0221 · Sep 10, 2003

Mo-Bo0st said:
Compressor side may be there, but if the exhaust side was "missing" it wouldnt be spining.

However if that were the case I think the cause would have been an event he definately would have noticed.

yea he def. would have noticied it but i was stumped and couldnt think of anything to trouble shoot with. i was saying if the turbine wheel lost its blades and they went out with the exhaust then it compressor wheel should still spin. If it doesnt spin with the car running then ya found you're problem. thats one nasty manufacturing defect though if that happened.

JaS4811 · Sep 10, 2003

Replied to your post on nyccdsm.

Any scuff marks on the compressor housing?

Did you check for your boost leak yet?

Is your boost gauge even moving? Has the reading changed since it stopped boosting?

If the turbo does spin freely check your external. Maybe it's staying slightly open?

Hope it's something stupid and not the turbo.

John

jprescott · Sep 10, 2003

Is it possible for your wastegate to be stuck open?

Boosted4 · Sep 10, 2003

alright problem solved......well it jsut got upgraded to a bigger problem...haha.
I go down to my shop today(father owns repair shop and hates turbos) and
1) take off intake, turbo spins freely.
2) start car look at turbo....spun half way around and stopped....
3) get it to "break free" by hand, start it and repeated step 2
4) cold side of turbo is hitting compressor f*&k me!
5) put car back together drive away
6) turbo is spooling...and faster and smoother than EVER! LIKE NEW!
7) Car still doggy, turbo wont go past 10psi
8) I determined, that my turbo was slowly going bad, and i didnt realize it. I noticed car was slower, but thought tuning was an issue. I will call Forced Performance about rebuilding my FPgreen, or maybe trade in for a FP3065
-Thanks for the insight guys

0 PSI of boost....PLEASE READ

Our Vendors

Top Contributors this Month

Recommended Communities