[L28ET leaking boost, sometimes..]

Which is the pop off valve?

[L28ET leaking boost, sometimes..]

Often times when I roll hard onto the throttle in first, second, and sometimes third I will hear a BOV-like sound of pressure releasing from the motor and a momentary loss of boost. This whole thing happens in an instant and then the boost will seem to build fine. What could be causing this?

 

A hunch tells me the problem is in this general area What a mess.

 

 

Also, how much of that is emissions stuff that I can eliminate?

 

edit- Oh and only mod to the turbo system is a boost controller.

[280zx just keeps boosting - Help]

It looks like thats my problem, thanks 240.

 

Any way to remedy this? Do I need to replace/rebuild my turbo or go external?

[280zx just keeps boosting - Help]

I cant get my new 83 turbo's boost under control. If I dont take my foot off of the throttle it'll approach 14psi. I have checked and/or replaced every vac line I could find but nothing has changed. I am using a boost controller that was installed in the car when I baught it. If I were to bypass the boost controller should it boost to the stock 6-7 psi? Because thats not happening either.

I'm going to keep looking for vac leaks, but is there any place where I should look or where this problem commonly occurs?