CyCloNe!

What is the psi if you clamp of the wastegate vac line?

I installed a MBC and I was unable to get any boost above 2... I then decided to clamp off my rebuilt 15psi wastegate and now I'm seeing 5-6psi in first, 8-9psi in second... haven't tried third yet.

Darwantae951

If the wastegate has no boost signal, it should default to the spring pressure.

CyCloNe!

ok, so does that mean since my wastegate has a 15psi rated spring that I should see 15psi max in the higher gears? since I did it the car boost great, nice smooth clim into boost..

Darwantae951

If you have a 15psi spring, then it should boost to 15psi if there is no boost signal. 15psi seems to be a pretty high pressure for the spring. Most usually do an 8-10lb spring as more of a failsafe.

CyCloNe!

Ya, the wastegate was done by Teamcrossworks... paid around 200 for it and man it is worth it. I haven't seen 15psi yet but I'm in the city so I'm lucky to see 3rd gear.. But it really does pull a lot better than my old factory one, boost builds up a little quicker it feels and if I punch it pulls nice and smooth.

I think my mbc is bad cause if I can boost then I know the wastegate is doing fine and the turbo is working. I checked 5 times about how I installed the MBC and it was correct so, I guess for now I'll just keep the wastegate plugged and watch my lvls.

Darwantae951

What MBC did you choose?

CyCloNe!

it was a turbonetics brand... i found out my wastegate has a 7lb spring and is built to hold 15psi... so I shouldn't have the drop off from 15psi to 12-13psi in near redline.