Add a 3-5 lb spring.

 

Just gonna throw a couple cents into the fire here cause I was dealing with boost creep for months on end with my wife's GSR. I tried multiple wastegates, spring combinations, cam timing, tune alterations, vacuum routing, ultimatley ended up blaming a 'supposed' FullRace ramhorn and sprung for a brand new BRMS unit along with a brand new Precision 44mm WG... same problem!! It wasn't untill I finally had a full exahust installed on the car (was open DP) that the boost controller will finally lock a target boost number and won't creep in the slightest.

Take it for what you will..

 

Do you mean you had a short exhaust and installed a full one with dump tube routed into the exhaust? Or do you mean you still have open dump to atmosphere coupled with a full exhaust now??

 

Problem solved No more boost creep
It hits always same pressure. 12.2Psi for 11.8 springs

 

I mean I had no exahust, open DP just after the oil pan, WG is still open dump, but for whatever reason, the WG could not bleed enough energy to prevent loss of pressure control above ~7k rpm.

 

the extra gate solved the problem?

 

Yes the 2nd Tial 44mm solved my problem.
No more boost creep.
II run always same pressure. 12.2Psi for 11.8 Tial springs