Car will not boost past 9 psi...

[GSTurbo1]

Ok so I have been working on this 1g trying to make a fast dsm. I cannot get it to boost past 9 psi to save my life, this is my third boosted car so I def have some knowledge. I have a turbosmart dual stage controller hooked up and working properly. So far I have replaced the throttle body with a rebuilt throttle body, tried a new external wastegate, vacuum tested the lines, pulled the BOV and looked to see if it had a leaking diaphragm (1g crushed bov), checked the turbo for play turned out to be perfect, fixed all exhaust leaks before the turbo.

I even pulled the vacuum line off the wastegate, should make uncontrollable psi. It only made 9psi ? I'm going to boost leak test as soon as i get a compressor, I have done it once and have so far replaced the leaks.

The only thing I could think of would be a boost leak, a severe one to overcome the big 16g. Or the flex pipe has collapsed. I'm going to try to boost leak test, and disconnect the down pipe to see if it makes a diff.

My tuning system is a safc with 550s and corrected.

The car runs pretty well, i'm just ready to up the boost to 14 or 15.

 

[Chipper308]

Ok so I have been working on this 1g trying to make a fast dsm. I cannot get it to boost past 9 psi to save my life, this is my third boosted car so I def have some knowledge. I have a turbosmart dual stage controller hooked up and working properly. So far I have replaced the throttle body with a rebuilt throttle body, tried a new external wastegate, vacuum tested the lines, pulled the BOV and looked to see if it had a leaking diaphragm (1g crushed bov), checked the turbo for play turned out to be perfect, fixed all exhaust leaks before the turbo.

I even pulled the vacuum line off the wastegate, should make uncontrollable psi. It only made 9psi ? I'm going to boost leak test as soon as i get a compressor, I have done it once and have so far replaced the leaks.

The only thing I could think of would be a boost leak, a severe one to overcome the big 16g. Or the flex pipe has collapsed. I'm going to try to boost leak test, and disconnect the down pipe to see if it makes a diff.

My tuning system is a safc with 550s and corrected.

The car runs pretty well, i'm just ready to up the boost to 14 or 15.

sounds like a boost leak, that pressure has got to be going some where.

 

[GSTurbo1]

Ok, i'm going to try an blt as soon as I get a chance. Its driving me crazy

 

[Chipper308]

Unless your gauge is junk...might be another possibility

 

[GSTurbo1]

its an autometer boost gauge and I physically know the boost is not going up. Should be able to tell a difference.

Ok guys took my blow off valve off and cleaned the grime off of it. Then put the blow off valve back on with some copper sealant. Went for a drive and about blew my engine, I hit 25psi without even trying. So I backed the boost controller down and this 16g starts to shred once it gets into the mid teens. Overall something must have been wrong with the BOV. The car seems like it has a lot more power also.