Only 5lbs of boost (not eco mode)

[JayID98]

Hey guys, posting here is my lasr resort but i cant figure it out. So I've taken my FiST to 2 mechanics, both did a compression and smoke test, reflashed to stock from stage 2 tune, uninstalled the AP entirely and reinstalled, nothing. I also made sure I didn't set to eco through the steering wheel or valet mode. I can't figure it out. The only other thing I can think of is the wastegate actuator but the last mechanic told me he adjusted it. Figured I get some advice before spending $$$ at a tuner that's 3 hrs away. Car had the stock turbo replaced, upgraded intercooler, turbosmart bov (I installed recently), engine mounts, and stage 2 93 octane tune. Also mapped a data log through datazap if anyone needs it. Much appreciated.

 

[dhminer]

Did you confirm the boost control solenoid is functioning properly? Also smoke tests are relatively worthless on boosted cars. It could be a boost leak.

 

[Dialcaliper]

Sounds like something bad with the wastegate actuator - 5psi is roughly the base spring pressure.

Is the car throwing any codes?

Possible failures
- bad boost control solenoid
- electrical connection to BCS
- loose or broken vacuum line to wastegate actuator
- damaged diaphragm inside wastegate actuator.

 

[JayID98]

Did you confirm the boost control solenoid is functioning properly? Also smoke tests are relatively worthless on boosted cars. It could be a boost leak.

I have not ill test it when I get home, do you know what the ohm spec should be?

 

[JayID98]

Sounds like something bad with the wastegate actuator - 5psi is roughly the base spring pressure.

Is the car throwing any codes?

Possible failures
- bad boost control solenoid
- electrical connection to BCS
- loose or broken vacuum line to wastegate actuator
- damaged diaphragm inside wastegate actuator.

No codes whatsoever (other than the oil life maintenance light just coming on yesterday lol). Considering even me trying everything with the AP, I figured it has to be something mechanical. I should have a voltmeter laying around somewhere, ill test the solenoid and actuator when I get home. Do you know the factory ohm spec for the ST solenoid?

 

[haste]

"posting here is my last resort"....lololololoolllolll.

want to make so many comments, but trying to keep it "correct'. i don't think i'll post anything....;

 

[WannabeST]

It sounds like you have a boost leak, the smoke wont show you where the leak is but the smoke is probably under 1 PSI and the compression test will be mostly for internal issues. I would take off your intake filter, cap it off with a boost leak tester and pressure the system by 5 psi at a time and you'll hear where the boost leak is and then you can determine if it's a loose fitting, cracked intercooler, broken coupler, etc.
Here's a link to a random tester I found online:
https://powerdrivendiesel.com/produ...utm_medium=cpc&utm_term=572065&v=7516fd43adaa

 

[JayID98]

It sounds like you have a boost leak, the smoke wont show you where the leak is but the smoke is probably under 1 PSI and the compression test will be mostly for internal issues. I would take off your intake filter, cap it off with a boost leak tester and pressure the system by 5 psi at a time and you'll hear where the boost leak is and then you can determine if it's a loose fitting, cracked intercooler, broken coupler, etc.
Here's a link to a random tester I found online:
https://powerdrivendiesel.com/produ...utm_medium=cpc&utm_term=572065&v=7516fd43adaa

I might as well try that but I had already taken it to 2 mechanics to do a compressions test, which is why I haven't tried that yet. I just checked my wastegate actuator yesterday, increased about 2 mm and gained .7 lbs. I'm thinking maybe my boost solenoid is out of wack/ consistently opening my wastegate. Any other possibilities are appreciated

 

[MariuszSTB]

Hello mate! Did you solve this? What was the issue?