GT Series Turbo Questions.

[JimmyMac]

Well I've been running a GT2871R for about a month and a half now. Mainly with a mbc and sometimes ebc. So vacuum line hook up was pretty simple. Cap off the factory boost solenoid and intake vacuum port. And run the lines from the wastegate actuator and compressor or boost source nipple to the ebc/mbc.

So my question is; How do you hook up a GT series turbo to the factory boost solenoid? The GT28 comes with only 1 nipple on the wastegate actuator. And no nipples on the compressor housing. But they do supply a nipple to pop into the intercooler hose coming off the compressor outlet.

The factory turbo has 2 nipples on the actuator. 1 for the hose going to the compressor nipple. And 1 for the hose going to the factory boost solenoid.

My current setup for the factory boost solenoid is this; Run a line from the wastegate actuator to the compressor side nipple. But "tee" off the line in the middle and run it to the factory boost solenoid. Yes, the other side of the boost solenoid goes to the intake nipple. My problem is I can't seem to reach desired boost. I'm about 6psi short. I didn't have this problem running a ebc/mbc.

I sold my XEDE which I should of kept. But I was just offered a good deal on a Standback. (XEDE is easier to tune, but has less features than the SB.) So I went for the deal. Installed. Everything checks okay. Voltages are in check. But I just can't hit my boost marks. I set it to say 15psi. I only hit 11.4psi. I set it to 17psi. I only hit 11.4 may 12psi. I set it to 20psi. I still only hit 11's or 12's. I'm not using a DH to read my boost pressure. I'm reading it off the vacuum line from the bpv.

So where should I start? Is it because I do not have a "pill" in the compressor nipple? Maybe the hole is too big? Should I run the line to the vacuum off the bvp instead of the compressor side? How is everyone else running their GT30's with the factory boost solenoid? I may just stick the mbc back on till I figure this out. Sucks to be down 6-8psi!!! haha. Thanks for any help...