Look, I am not trying to be a pr**k, but I just want to make sure that you understand the concept of preload. Once you understand, then you'll realize that it is not possible to have "a lot" of preload and, at the same time, only be boosting 11 PSI.

Normally, if you are boosting only 11 PSI peak , then your wastegate's preload level could not possibly be at anything above 11PSI either. You would, in fact, be at zero preload since the stock 16G turbos have a base WG pressure of 11 PSI.

So, when you say that you have a lot of preload but a peak boost level of only 11 PSI you are stating an impossibility given a properly functioning flapper valve and a properly connected WGA.

Let's say for example that you order a turbo from Forced Performance and specify that you want the WG preloaded to 18 PSI. They will pressure test it on the bench and set the actuator rod length so that the flapper valve opens and limits boost to 18 PSI.

Once you install said preloaded turbo onto your car there is no way that you'll be able to set peak boost at any level under 18 PSI, no matter how much you try to adjust it with your boost controller. The actuator's internal spring will keep the flapper valve on its seat until 18 PSI.

So, you can't have a "lot of preload" and at the same time only be reaching 11 PSI peak boost. Your peak boost level, cannot be adjusted lower than the preload level. It would mean that 11 PSI on the diaphragm side is somehow overcoming a higher pressure on the spring side of the actuator. I just dont see it happening.

 

I get what your saying sparky. dont worry i aint gonna take nothin to heart. Im just grateful your helpin me out. It is very appreciated so thank you very much.

Now back to the problem. My only problem is that i can get that dam heat shield off the wastegate portion of the turbo. I need to find a lift. I did manage to spray it with pb blaster just in case it was rusted up stiff on the outside then i pryed it to see if there was any movement and there was. Im gonna try and see if i can find a lift to get at the waste gate other wise i might just buy a new 9 turbo.

Im not sure what else it could be now.

And Thanks again Sparky. Great Man. +1

 

Emperor: Don't go out and spend your hard earned $. I think that your problem may have something to do with your EBC programming or its connections.

Borrow a proven MBC from a buddy, install it properly and see if it helps with your problem. Also, try the test that I suggested: First adjust the actuator rod length to where the eyelet just freely slides on and off the pivot peg. Then, incrementally shorten the actuator rod by rotating the turnbuckle. This should raise the spring pressure(preload).

 

got to a buddy's house and got the chance to adjust the actuator rod. I rotated it 3 full turns which also brought it to the end of its adjustment. Tried it out and still only getting 12 psi. After that i decided to try and pull the wastegate line and i did get max boost this time. It was somewhere right around 1.8-2.0 bars. I didnt have the laptop this time.

I guess I need to find a mbc. Not to many people in my area may just have to buy one.

 

I think your right in that its in my boost controller. I may just buy a gm solenoid. by chance do you know what they max out at for psi ?