Ok, I have a serious boost creep problem... I have tryed 3 different wastegates with 8psi springs (a 35mm, 40mm, & now Tial 38mm) I have a direct line from the charge from compressor housing to the wastegate. My car always does 1bar(14.7psi) or more. I mean wtf. This is really becouming a problem for me. any insite to wtf could it be.. heres a pic of my setup.. Built B18C1, T3/T04 .63/.50 a/r 57 trim, SSAC manifold, 2.5in down pipe, currently Tial 38mm gate.

 

either the wastegate doesn'T open (seized piston or leaky connection of the hose)
or the dump tube is too restrictive.

Oh, you did not plug anything on the top port of the wastegate did you?

 

how about....

your boost gauge is probably hooked up to your manifold, your wg line is on the compressor

the intercooler on that car is massive, so the air gets more dense, and can make more boost.

So make sure there's nothing plugging the top of the wastegate port, re-route the WG line to the intake manifold and get back to us

 

boost guage is perfect.. It did this with my old setup, smaller 28x6.5x2.5in intercooler so that not the problem, Ive tryed 3 different wastegates & thats not the problem, all vacuum lines are ran right & Ive tryed running WG line to manifold & it dont help. & top of wategate is left open. When I had a shitty restrictive turbo muffler it didnt creep, but with new Greddy EVO or run just down pipe it aways creep to 1 bar. Im stumped

 

your having a problem boosting 1 bar on a fully built motor? get a boost controller and turn it up

 

Im running 450cc injectors.. my tune doesnt allow for big boost yet

 

i think youll be ok with 1 bar on those injectors....its your call though...if you dont wanna tune for the bigger boost on those injectors look at what blaast said....pretty sure he's right on.

 

You probably have had 1 bar springs in the wastegates.

 

Please tell me it's not an autometer boost guage :P My old A-M guage used to show 18psi on my stock 14b with stock internal gate that ran 8psi

 

Nah thier not.. THe wastegate on my car right now was on my brother setup & was no doubt a 8psi spring, same with the other wastegates. colors match to 8psi, so def not that

& the boost guage is an 60mm Greddy Electronic warning guage, & its not that either cuz I tryed my old greddy mechanical boost guage & it read the same... Ive tryed everything I could think of.