Solved my boost problem!
With my setup 100hp (ATS) injectors, Drag/Custom Comp, PDR hx40, and ats Manifold.
For about the last 6 months I have noticed a drop in boost pressure that has kept getting worse.
Originally I was hitting 39-38 psi with my PDR 40/16.
Lately I checked my turbo (when I installed my O ringed head).
It was in excellent shape and spun like it was still new and had no play.
Also mid throttle boost was long to come up and somewhat sluggish.
I also checked my boost gauge line, it was fine.
I check all my intercooler boots, all looked good, plus I went ahead and tightened them up a bit.

So I figure what the hell, I install a restrictive wastegate elbow that I had laying around.
I did, and the results are great!!
The mid throttle responsiveness is back, I can easily hit 24 psi now with my Edge box OFF.
Before I was lucky to hit 20 psi.

On a WOT throttle run over 100mph I was able to hit 40psi and maintain it, before it was 31psi.
On a run in WOT with OD cancelled I hit 43psi, this turbo really sings now!!

I know over 40 is dangerous, so this weekend if I dyno I might just have to put the open elbow back on.

So is the wastegate actuator worn out??

--Justin

 

What kinda elbow did you have before and why did it start losing boost at all?

 

I had the stock free-flowing elbow that PDR supplies with their HX40 turbo.
Piers sets his wastegates to open at 38-40 psi.
What I think is that the wastegate actuator began to wear out, and was opening prematurely.

The elbow I have installed now is the brass unit that Edge and other fueling box manufacturers supply with their fueling boxes to delay the opening of the stock set/factory wastegate.

--Justin

 

My problem is different. My boost numbers are getting higher. I still have the HX 35 and usually it hits 36 psi with no problems. Lately,
it has been hitting 42 to 44psi. What would cause this??????????????

 

I installed the Edge Brass fitting in my PDR 40 to and I hit about 40.5 LBS in second 3rd and 4th ;D