Very annoying issue going on here. And I searched a few times, but the results were not helpful when I applied them to my car.

Car has no boost leak, was tested about 4 times and every time came back clean.

Stock turbo IX with only a MBC,filter, exhaust and tune.

The MBC is only plugged off right now because when plugged in will make about 22 psi and drop as far as 11 psi at times. Making 250whp on the dyno.

With the WG unplugged, it will peak and hold 24/25 and make 370 on the same dyno. You would think with it unplugged, it would build as much boost as possible making over 30+psi on even a spike, but nope.
I dont think my turbo is crapping the bed, because it HOLDS the boost that it makes just fine. Is it my WG actuator rod? bent maybe, or not opening properly?


thanks in advance!

 

Do you know if the wg, or hotside was ever pulled out or removed? Maybe the mbc is the culprit? Do you have a friend who has a mbc as well? Try to narrow it down. Good luck.

 

Well shouldnt the car boost to almost 35 or 40 psi if the WG is unplugged? it only hits 24 the way it sits. I am about 100% positive that the hotside was never pulled off, or hotside.

 

What are you measuring boost with?

 

A Stewart Warner Gauge. Always proved to be accurate before, and seems quite responsive. I guess maybe i am fearing the car is totally over boosting, but the gauge is only reading that? is that maybe what you were going to imply next?

 

[quote=Silverfox9;7351570}.....The MBC is plugged...because when plugged in.....With the WG unplugged, it will peak....You would think with it unplugged....Is it my WG actuator rod? bent maybe, or not opening properly?[/quote]The plugging and unplugging of the WG as well as the MBC has me a bit unsure as to what exactly you are refering.

Either with the MBC disconnected but with the vaccuum lies "plugged". Or, leaving the MBC plugged in but turned all the way out to the lowest attainable boost setting. Run a length of vacuum hose from the compressor housing discharge nipple to the nipple on the WGA cannister.

Now, increase boost incrementally by rotating the "turnbuckle" on the threaded end of the actuator rod inward(clockwise) which will effectively shorten the overall length of the rod thus increasing boost. At least, that`s the way that it is supposed to work.

Start out by rotating the turnbuckle in by two full 360* turns. Reinstall it onto the WGA`s pivot arm and take it for a test drive. Keep your eye on your boost gauge. Eventually, turn by turn, you should work up to about 17# of spring pressure. Then reconnect your MBC and dial the boost up to your peak boost level with the MBC.

 

Thanks for chiming in! I am at work right now, but my next available time slot i will try each thing you mention....

Will let you know.