Trying to dial in MBC, getting huge spikes

[idkiliketurbos]

As the title states, I am trying to dial in my MBC and i've been getting HUGE spikes. It's an SRP MBC and i'm looking to get around 12 or 13 psi steady on it. The turbo is a 14b. I have one hose to the wastegate nipple, and the other one right on the J-pipe nipple so my connection should be fine. I started out at a low 7 psi and gave it a turn, got me to 10, gave it another turn, 15..let off throttle. Turned it back a little bit... 12-17ish then quickly let off the gas. Turned back down to start over. Steady at about 8 psi then BAM all the way up to 16 psi. I can't get it and it is spiking like crazy. Do you guys have any ideas on how to fix this or what is causing it. Thanks.

 

[Friend-O]

Sounds like a faulty MBC due to bad ball or spring or could just be a simple case of boost creep, it all depends on when it spikes. you can try running your mbc off a air conpressor and some vac hose rigged up to check its opening pressure. Ususally theyre hard pressed to be bad so it may be boost creep.

 

[idkiliketurbos]

I'm guessing its just boost creep because I have a 3 inch turbo back exhaust as well.

 

[Aproductions]

you should try a 2.5-3" downpipe. or port your WG or go external WG