Solving Boost Creep.....

[inmyshadow]

Alright. With my shadow back up and running, I'm still suffering massive boost creep.

My turbo setup is this. A TU super60 turbo with large wastegate can, 63 A/R housing, TU 3in swingvalve and full 3in exhaust. I have a 3in exhaust cutout as well.

Boost control is a HKS EVC EZ, along with direct vacuum line to wastegate. When the car was down, I also ported the wastegate hole abit. Just not anywhere near the diameter of the TU's puck. I openned it up and smoothed the transtions around the hole.

Either with the boost controller turned off or direct vacuum line to manifold, the symptoms are the same. Low RPMs, I get 9lbs of boost at WOT. My boost creeps up fast as I cross 4000 RPM to redline. Boost shoots to 14lbs of boost by redline.

What can I do in the short time to help lesson the boost creep. In the long term, I still have to install the new block. At that time, I'll probably port the wastegate hole more.

My thread about porting the wastegate hole.
http://www.turbo-mopar.com/forums/showthread.php?t=28930

[iTurbo]

How tight was the wastegate rod going on? Maybe too much preload?

[Tony Hanna]

How tight was the wastegate rod going on? Maybe too much preload?
http://www.turbo-mopar.com/forums/showpost.php?p=364432&postcount=25

I ported the hole earlier. Its pretty hard to make the hole bigger with a .63 A/R housing. Porting the hole leads into alot solid material.

So I opened the hole as much as possible, which doesn't seem like much. Then I blended the hole where I couldn't remove much material. Hopefully it is all enough.

I also shimmed the wastegate when I put the topend back together. I just need to get some allen bolts so I can bolt down the swingvalve.

later

I think Jeremy is on the right track thinking about the tension on the rod. Pulling those shims back out would be the first thing I would try.