Last couple time I took "Tiffany" out the boost pattern was weird. It boost fine at first ..pulls to the redline, Let off throttle shift gears floor it and It only seems to get 4 psi, I can raise boost controller and it will boost higher on the first run but same issue only higher boost on the first run.
Im thinking blowoff valve or waste gate.

Its a REW ,microtech , tuned by steve Kan t3 35r turbo , turbosmart e boost controller, syncronic Blow off valve, tial wastegate. I have an extra HKS blow off valve that is probably the easist thing to try first.

Any Ideas

 

If Tiffany is the name of the girl in your avatar then let me take her for a ride too! Sorry that was not constructive but she is smoking!