hey bro, we had the same problem up top too.... went from 22psi to 18psi at the topend....from 6.5-8.5K..... power toped at 420whp and stayed steadied and dropped......a/f kept on screwing around too... had to tune akwardly from low boost to high boost settings and then back to low boost settings...this sucked. Found out it was our wastegate spring!!! another thing is we had problems with the Turbo XS MBC... Changed both and boost is consitent now at 28psi!!!! doesn't move a hair!!!

also check for a leak in pipe!!!

 

I was using those cheap rubber couplers from home depot and found out the hard way. So I replaced them with some Mack couplers that I got at the diesal junk yard (can't complain, they let me have 'em for free!). All the rubber couplers that was on my car either had little rips under the clamps or were expand very badly due to the heat. Car pulls much stronger on the butt dyno now.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by j-robsDA &raquo;</TD></TR><TR><TD CLASS="quote">First off, dont go to John Haley. I have heard nothing but bad things about them. And dont go to propulshun. Try Elite Autosports in Minneapolis. They tuned my car. And shane at elite knows his ****. call them.</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ochsy03 &raquo;</TD></TR><TR><TD CLASS="quote">yea shane at elite autosports tuned my car to...they did a really good job</TD></TR></TABLE>

same here. i will only take my car to get tuned at elite. shane has always been the one that tunes my car.