Boost still disappers, help!

[turbowrenchhead]

I have been dealing with this issue since last year. I get up to 12 to 14 pds of boost and the gauge drops and i loose power untill I let off and reapply the throttle. It will stay steady at half throttle or so then when I put the throttle the rest of the way down it instantly disappers. Last year I wired the wastegate puck shut and it didn't disapper so this told me that i must be sticking inside the hole in exhaust housing.
So last week I had an external wastegate put on. I have steady boost with no controler on it but it only runs 8 pds of boost. As soon as I put my grainger valve on it same thing. I tried my air regulator in place of it and same thing. Then I plugged the outlet off the compressor housing and ran the controler to the map sensor line and I also replace the small lines with 7/32's vacuum line. Same thing. I cranked down my BOV and no change. Right now I took off my BOV and put a plate in place of it. I did this last year with the BOV and had no change. Now I'm grasping for ideas as to what could possibly cause this strange problem.

 

[WFO]

I'm guessing you put in a deltagate on the x-over?

Whatever it is,it's working cuz it'll hold the stock spring pressure(8 psi).I think your problem is in the plumbing,and the wastegate's just doing what you tell it to do.

Did you plumb it up like this:

http://www.gnttype.org/techarea/images/wstgate.gif

Cuz I know that works,that's what I used with my deltagate.

 

[turbowrenchhead]

That is exaclty how it is plumbed.
I tried a different chip and 87 with the chip. No change. I am going to test the i/c tomorrow and maybe change my i/c hoses.

 

[turbowrenchhead]

UPDATE!

Finally figurered out the problem. I put a 3" piece of pipe about 8" long inside of my stock air intake about 12" away from the turbo. The intake when it got good and warm would get plyable enough to suffercate the turbo. It only took a year to figure it out. But I did it and no one else. I talke to Red Armstong, PT&E, John Craig. John from John's performance and I think there were a few others. Not one person was even close to what the problem was. So it works how it is suppose to work!

 

[WFO]

Was it like PVC type pipe?So the plastic would get soft and collapse?

 

[turbowrenchhead]

Its sorta flexable plastic. Where it sits on top of the tall valve cover breather it is already kinda flatend. When the car was cold the boost wouldn't disappear it had to warm up first. So when it go warm and the turbo started sucking it sucked it enough that it would suffercate the turbo. Its still the stock intake boot. I would like to run a 4" intake with a LS6 maf and trans. But that I don't have $ for right now.

 

[Lee Thompson]

pat

"But I did it and no one else"
Pat yourself on the back.