hellppp!! boost creep?!

[lilfetus2k5]

i upgraded the turbo to a gt28rs and the wastegate that was on there was running 12-16 psi so i bought a 12psi hks actuator and in first gear it holds 12psi no problems, then 2nd gear it gets to 12 and creeps up to about 15, 3rd gear samething. 4th it creeps to about 16 and i havent done 5th cause i get frustrated by then.so i put on a 8psi wastegate and the same thing, first gear 8psi perfectly, then 2nd gear it holds 8 then creeps to about 10-11, 3rd gear creeps to 13-14.. idk what to do?! and it runs damn lean on the dyno in 3rd and 4th gear.. im not sure the exact numbers off the top of my head but its dangerous lol. i have stock injectors but a 255 fuel pump.. what do i need to do to lock down my boost?!no matter what wastegate i try (ive tried 4 now) i have boost creep.is the turbo just out flowing the wastegate? i thought that at first that was it but 6,8,12 psi wastegates is the same story.someone help!! ive looked around and cant find exactly my same problem on here so sorry if there is and i missed it.

i was thinkin about buying a stock t25 and putting that back on there since i dont have mine any more... any suggestions

[!Zar!]

Where is your vacuum source for the boost gauge, and is anything else connected to it?

[lilfetus2k5]

my boost gauge is straight to the throttle body. my wastegate signal is right now on a nipple on the hot pipe, ive tried teeing it from the bov too and same situation.. im so stumped!

[lilfetus2k5]

SO I BOUGHT A BRAND NEW STOCK T25 AND PUT IT ON CAUSE I FIGURED STOCK WASTEGATE, STOCK TURBO STOCK FUEL AND EVERYTHING I SHOULD BE RUNNING JUST FINE.. BUT NO! SAME DAMN THING. ANYWHERE FROM 10-14 PSI. I RAN ALLLLLL NEW VACCUM LINES EVERYWHERE AND TRIED 2 DIFFERNT BOOST GAUGES AND IM IN THE EXACT SAME BOAT AS I WAS WITH THE T28... WHAT THE HELLLLL DO I DO NEXT?! ANYTHING HELPS GUYS! THANKS

[WI_240sx]

internal wastegate's always tend to have boost creep. they just have trouble keeping up with the speed the turbine has.. make sure that your actuator for the wastegate is hooked up to its own vacuum source, dont T off of another vacuum source. most people fix this problem with external wastegates, cuz they are much larger than internal, so they have no problem keeping up with the turbine, however, size ratio from turbine size to wastegate size is important. remember that boost creep doesnt only creep up in a positive, but can also lower boost output as well as higher rpm is reached.

if you are willing to spend the money for a new manifold with external wastegate flange and purchasing a new turbo with external waste gate, than that is the rout you should go..