Boost drop off issues

[Nougie]

Set up- BPU 7mgte
Issues- Boost will not hold or exceed 5psi
Possible Culprits- Wastegate/boost leak, ?

The Cool Story- Installed the new DM IC Kit.
-day one held boost just fine(10psi with Hallman MBC)
-day two, i ate a driveway(my car is pretty low) and broke the lower ic pipe t-bolt clamp. It still clamped the coupler with just enough force to still drive the car fine out of boost.
-day three comes and im in for the clamp replacemet! Done, i turn boost all the way off to wastegate spring pressure only, test drive comes and i see ZERO boost at WOT? hmmm. Go time again!, come to find, coupler to turbo clamp was loose, Done!, test drive #2, i get 3psi at WOT?! Go time again but this time throwing some shims on the wastegate for testing purposes and i see 5psi dropping off ~3psi.

A boost controller technically, bypasses the wastegates spring pressure correct? so meaning since i have a MBC, i can just set my boost levels where i desire without any drop off issues?

And here i stand making this thread. Im thinking its the wastgate spring/stuck open or a boost leak that im too mentally incapable to find? Any ideas or thoughts here? thanks in advance!

 

[AbsoluteSpeed]

Are you using the stock or aftermarket boost gauge?
This could be an issue with the wastegate but I would sooner be looking at the intercooler piping because of your little incident with the driveway. Try pressure testing it and see if you can hear any leaks.

 

[IndigoMKII]

Ate a driveway, do a boost leak test and make sure you didn't bump anything else off. Sounds like a boost leak cause stock system should get 6.7 psi.

If you've got full exhaust it'll go to 9-11 psi.

 

[91whitepack]

hmm. Sounds like what mine did when the turbo started leaking at the manifold. Everytime ive had a boost leak the car went rich and smoked. Sometimes hit fuel cut if it was a bad enough leak.