Turbo still doesnt boost.

[GsxEcutioner]

well I just replaced my actuator because the last one didnt even open at 15psi or anything. well I just put it on, and I get 4 psi and a LOUD screeching noise when boost hits. I hope its not whine of death. can it be anything else?
-shane

 

[Calan]

If the actuator isn't extending at all, you'll over-boost, assuming it is binding or keeping the flapper shut.

Disconnect the actuator arm from the turbo and make sure the flapper moves freely.
Does the actuator arm move if you put air pressure directly to it (bypassing the BCS or MBC) with it disconnected from the flapper? You'll need to apply enough air pressure to overcome the return spring...usually 9 to 14psi (I think...someone feel free to correct that range there

Is the noise an increasing whine as boost comes on (normal), or does it sound like metal on metal (not normal and a bad thing)? Any oil in the IC pipes, or blue smoke?

Pull the intake and check the turbo for shaft play.

 

[GsxEcutioner]

If the actuator isn't extending at all, you'll over-boost, assuming it is binding or keeping the flapper shut.

Disconnect the actuator arm from the turbo and make sure the flapper moves freely.
Does the actuator arm move if you put air pressure directly to it (bypassing the BCS or MBC) with it disconnected from the flapper? You'll need to apply enough air pressure to overcome the return spring...usually 9 to 14psi (I think...someone feel free to correct that range there

Is the noise an increasing whine as boost comes on (normal), or does it sound like metal on metal (not normal and a bad thing)? Any oil in the IC pipes, or blue smoke?

Pull the intake and check the turbo for shaft play.

the flapper does open and close freely. I just replaced the actuator today, the symptoms were before. but now it seems that the noise stopped because i crushed the top of the bov.......i need a new bov now, i think it was leaking thats why.
-shane

 

[Calan]

Well... I'm not quite making the connection between the screeching noise and a BOV, but do a boost leak test first then

 

[rush2252]

If you were running the 1g uncrushed it will piss air and have a high pitched noise as it begins to open and leak pressure. The only other thing I could think of would be shaft play causing the turbine to be eating into the aluminum compressor housing but thats not an everyday occurance.

Craig your correct on the 9-14psi range


Good Luck
Kolby

 

[GsxEcutioner]

Well... I'm not quite making the connection between the screeching noise and a BOV, but do a boost leak test first then

well the round top of the bov was dented in, and i reved up and you can hear it screech. I rounded the the top so its flatter and even and the noise stopped, but still not more than 4 psi, but the screeching noise is completely gone.
-shane

 

[rush2252]

If you've ruled out boost leak and still having issues check my post in this thread. Look at the pic I posted. Thats what I found after having very similar issues. Craig saw this piece first hand. Its now a paper weight on my work bench.

http://www.dsmtuners.com/forums/problem-diagnosis/336022-boost-problem.html

Kolby

 

[GsxEcutioner]

i know i have a few cracks,

 

[rush2252]

There are cracks in the hotside around the flapper like the pic? Well id say problem solved. Or at least you know what the issue is. If that flapper doesnt seal your losing boost its hard to calculate how much. Judging by cars performance it was only running 2psi with the ball bearing MBS cranked all the way down on that hotside in the pic.


Good Luck
Kolby

 

[GsxEcutioner]

the turbo was running fine on the previous car 0_o........

 

[GsxEcutioner]

I retract my previous statement, I replaced the BOV, still same noise, I have no idea why crushing the top of the BOV seemed to stop the noise though? 0_o.........

 

[Calan]

As I mentioned, I was having a hard time connecting a screeching noise (which I take to mean a metallic type noise) with the BOV. Maybe a high-pitched air produced sound like Kolby mentioned, but not a mechanical screech.

The BLT checked out ok? Have you tested the boost controller and WGA separately?

Is the flapper opening cracked and leaking really bad as in Kolby's pic, or does it seem to be sealing ok?

Can you be more specific on the sound, or maybe think of something that it sounds like?

 

[GsxEcutioner]

As I mentioned, I was having a hard time connecting a screeching noise (which I take to mean a metallic type noise) with the BOV. Maybe a high-pitched air produced sound like Kolby mentioned, but not a mechanical screech.

The BLT checked out ok? Have you tested the boost controller and WGA separately?

Is the flapper opening cracked and leaking really bad as in Kolby's pic, or does it seem to be sealing ok?

Can you be more specific on the sound, or maybe think of something that it sounds like?

its boosting 4 psi, the screeching stops once everything is warmed up and i drive for a bit 0_o, boost controller his a hallman pro which I RTV'd the two ends so it would seal, the BOV has a gasket and is RTV'd as well. WGA is fine, Its the same outcome from running no mbc by connecting the wastegate to the j pipe nipple. Boost leak is good. ITs a high pitched only when the turbo spools, no Spool or no attempt of spooling=No noise, Noise goes away when warm but still doesnt boost. -__-, It sounds like something whistling really high pitched.......
-shane

 

[T9S1i]

where are you at in DC? i might be able to meet up with you to give you a hand in diagnosing the problem.

Hit me up with a PM, i know ive got an extra WGA and BOV and some other parts laying around if we need to swap stuff out to see what the problem is.

 

[Dsmj89]

Sounds like the turbo is gone. Could also be that the wheel is hitting against the compressor housing.

 

[rush2252]

If the MBC isnt making a difference then boost leak somewheres. I have a leak at the moment and it will hold steady @ 14psi regardless of how far down I crank the MBC it also smells as if Im venting which im not.


Keep lookin!
Kolby

 

[Boosted98gsx]

Check for shaft play, and check your injector seals.

 

[GsxEcutioner]

If the MBC isnt making a difference then boost leak somewheres. I have a leak at the moment and it will hold steady @ 14psi regardless of how far down I crank the MBC it also smells as if Im venting which im not.


Keep lookin!
Kolby

Mine smells like burning oil, sometimes it smells like fuel, I have no idea, I checked for all boost leaks. =/.........Frustrated man
-shane

Check for shaft play, and check your injector seals.

No Shaft Play in and out, slight side to side but its like a normal side to side, Injector seals ?????? Why?
-shane

 

[Boosted98gsx]

Injector seals can crack when they become brittle, due to engine cycle heat, and leak boost. Normally when they leak, they will "scream" like a blow off valve but constantly.

 

[GsxEcutioner]

Injector seals can crack when they become brittle, due to engine cycle heat, and leak boost. Normally when they leak, they will "scream" like a blow off valve but constantly.

it only screams on boost, and the sound is coming from around the turbo area.............. but your saying injector seals can be a boost leak?????

 

[Boosted98gsx]

dude, DO A FREAKIN BOOST LEAK TEST! holy shit.

 

[GsxEcutioner]

damn......ok I have to make a tester tmrw, i will get back to this tomorrow. thanks
-shane

 

[rush2252]

+1 on injector seals. Mine were hard like plastic after the TSI sat for several years. They leaked vacuum at idle and boost under load. The car ran like shit. I didnt have an aftermarket boost gauge at the time but im sure if I did I would have seen minimal boost.

If your intake and IC piping arent leaking when you perform the test and the flapper is seating well then it could be the turbo. Even being worn out it should still boost more than what your getting.

Whenever you do your BLT throw at least 20psi @ it and see what you come up with. Soapy water solution helps as well.


Good Luck
Kolby

 

[GsxEcutioner]

Same Sound, I changed the turbo, same sound, I did Boost leak test, leaked through the j pipe, so I resealed it, and its fixed, I was leaking through the throttle body elbow gasket, fixed, still the same sound, still no boost 0_o...................

 

[Boosted98gsx]

have you checked for things in your intercooler piping? things, like paper towels that would obstruct airflow?