Boost Peaking

[Sleeper87]

Ok, i have an 3"downpipe, the big walboro fuel pump wit hotwire kit, atr 3"testpipe wit dump *cutout* and a full 2.5" Hooker catback exhaust, Adj Wastegate actuator, Boost guage, Air/Fuel Mix guage *dont work 2 well for some reason*,Thrasher stock Injector Chip, TTA Fuel Pressure Reg, Fully rebuilt motor bye a GM dealership. My question is whenever i get on my car it swings to like 20+psi even know i have the wastegate screwed almost all the way in. Im not to sure im gettin why this is happening, how do i control the amount of boost, i dont and i know i should be swinging that high its hittin like 23-25psi on 93octane, i hear no knock, i dont have any scantools for i am thinking of gettin rid of my car. the motor has 6k on it. Anyone know why after a certain PSI it just seems to just not accell anymore? Why is my boost cranking up there and how can i stop it or do i need to stop it, i do although after hitting that much of PSI the car kinda studders after i let off almost like its pulling timing or something. Thanks
Sleeper87

 

[Weazel]

Oh, sleeper, you're KILLING me man!! 23-25 PSI on pump gas! Seriously, let me come down your way, or we'll meet up somewhere, and I'll hook my DirectScan up and we'll see what's wrong with your beast.
I didn't quite understand how you were describing the wastegate. Seems to me that "screwing in" would be making the overall length of the rod shorter, and that increases the tension on the wastegate puck itself. That'll raise your boost bigtime. Is the rod hard to "click" back on the anchor below the turbo shroud? Like do you have to pull hard on the wastegate rod to get it back there?
It's not accelerating after a certain PSI because I'm sure the engine is retarding the timing like crazy, which is gonna kill your power regardless of how much boost you're running. Because you can't really hear knock doesn't mean its not happening.
Seriously, if you wanna meet up somewhere, I'd be up for hooking up the scantool. Take it easy.

 

[blackbuick87]

The reason you are going slow is because pieces of the bearings and crank are making you lose traction!

Do not step on the gas anymore or you wont have anything to sell