Question about Turbo

[Moonpie.Express]

Is it possible for Turbo's to bind (stop spinning) during acceleration?

Here is what I am seeing:
-speed is varied when this happens (usally 5th or 6th gear)
-I do have a boost gauge and Cobb SRI (I can hear things now)
-the boost comes up (you know the feeling) then stops ( you feel that too)and drops to around 10 inches of vacuum. No matter how much you push the throttle, nothing changes.
- a gear change or coming off the throttle sometimes returns car operation to normal.

Just wondering about the possibility. TIA

 

[Sacrilicious]

wait...so does the tach say? unless i'm missing something, this does not sound like normal behavior.

 

[mazpro]

so while you are accelerating @ WOT, there is no boost?

 

[WTF MATE]

bad gas maybe? Computer might be retarding boost sensing a knock. (strictly hypothetical) For your question, yes that's possible but it doesn't sound like thats happening. Having your turbo bind while spinning at around 30k rpms would in most cases cause it not to ever spin again.

 

[redrocketz]

possibly a bad BPV opening after so much boost.

 

[2.0t03speed]

pull your intake off and check the wheel for shaft play and scoring thats going to be your easiest way to see if the turbo was the culprit. also i think if it just stopped spinning you would hear a loud screeching noise as it came to a stop.

 

[Moonpie.Express]

Thanks guy's!!!

wait...so does the tach say? unless i'm missing something, this does not sound like normal behavior.

Tach operates normally.

so while you are accelerating @ WOT, there is no boost?


it has happened, but not knowing what it would do, I only did the WOT once!

bad gas maybe? Computer might be retarding boost sensing a knock. (strictly hypothetical) For your question, yes that's possible but it doesn't sound like thats happening. Having your turbo bind while spinning at around 30k rpms would in most cases cause it not to ever spin again.


I stick with one gas (Shell) yet that does not mean bad gas does not happen (fart jokes here). And I agree, something spinning that fast and binding, would not do it for long. I am just not assuming anything on my first turbo ride.

possibly a bad BPV opening after so much boost.

Not really hitting that much boost (<10 psi). And when the stock BPV opens, you hear it with a Cobb SRI

pull your intake off and check the wheel for shaft play and scoring thats going to be your easiest way to see if the turbo was the culprit.

Will do, as soon as this stupid global warming ends (winter). Warmer days are almost here.

Thanks again!!!

 

[redrocketz]

/\/\ Exactly you are hitting more boost and it is being bled off through a bad factory BPV they can and do leak even at only 10psi... something to look into. There is a reason people buy aftermarket valves other than fancy noise makers.

 

[Moonpie.Express]

redrocketz....is there anyway to verify leaking boost from BPV?

 

[2.0t03speed]

only think i would think of to do in a situation like that is take your bpv off and fill up an air compressor with 15 psi and then run a vac line from the end of the compressor to the bpv and see what it does when you give it some air. if it opens and air comes out there is your problem.

 

[Sacrilicious]

what i meant by the tach question is what RPM does this problem happen at? is there even a specific RPM? your first order of business is to determine if the turbo is spinning at all. do you still hear the turbo whine when you lose boost? if so, then you probably have a leak somewhere (could be BPV, loose hose, etc.). if NOT, then you may have a much more annoying problem, since turbos that don't even spin up when they're supposed to could be suffering from any number of problems...half of which don't even include the turbo itself (ex: wastegate stuck).

 

[Moonpie.Express]

only think i would think of to do in a situation like that is take your bpv off and fill up an air compressor with 15 psi and then run a vac line from the end of the compressor to the bpv and see what it does when you give it some air. if it opens and air comes out there is your problem.

I can do that.

Sacrilicious - I have never paid attention to the RPM during those times. It usually occurs in the worst possible moment (passing, stomping on it to let my ticket magnet pass). Also, I do believe I till hear air being sucked in thru the intake. It very well might be the BPV.



I want to thank everyone again.

 

[2.0t03speed]

np =)