Is it my actuator or boost controller

[moses]

I recently did a turbo swap to a gt2871r and everything went good. The problem ive been having is that the greddy profec spec II boost controller (that worked fine with my other turbo) is boosting over 20psi no matter what the settings.
So what i did was turn off the boost controller and see what happened. It still overboosted +19 psi. Then I took the boost controller completely off and hooked up a hose from the actuator to the hotpipe. It now boosts to 15psi and stays. I was told there were 2 springs in the gt2871r turbos, 9 and 15psi, so that means it is running stock, right?
Slider2828 thinks it is the length of the actuator that is messing it up and I think my boost controller took a shit. I just want a couple of more opinions before i try to buy a new boost controller or start messin with the actuator.
Also I dont see any rips in the lines to the actuator but i will change them out anyways.

[Sileighty_85]

Some one had a similar problem with theirs they englarged the W/G hole a bit and it solved their problem

[moses]

I dont think that will do anything for me. my actuator works fine by itself.
I replaced the lines and it did nothing. Can I basically say that the boost controller is bad?

[BiG MiKE86]

could be - those solenoids are kinda fragile - did you have it mounted secure with the rubber washers or w.e.? Did you not change the settings on ur boost cont. after the turbo swaps? Is the boost cont set up correctly? Post ur Settings for Lo/Hi Boost

Stupid Question - but are you sure the lines from the solenoid to turbo/hotpipe are correct? Could the line to the boost cont. unit itself be kinked? torn? does it read proper vac. @ idle?

[moses]

I got it figured out. Im a god damn dee tha deee. I was plugin in the wrong numbers. I got the numbers from a guy with a actuator at 9 psi and mine is at 15 psi. not good:duh: and i didnt know turning it off would make it not work (i thought it would go to stock)
So I zeroed it out and it hits 16 now. just to let you guys know
low, set-0% , gain 13%, set gain 0 boost at 16
high, set-34%, gain 20%, set gain 27 boost at 19
19 is safe right. what the highest on 93 octane i can go?
Thanks guys

[steve shadows]

Have you tried turning up the GAIN settings really high with the BC? Usually this fixes that issue.

[MudRacer]

I got it figured out. Im a damn dee tha deee. I was plugin in the wrong numbers. I got the numbers from a guy with a actuator at 9 psi and mine is at 15 psi. not good:duh:

There you go.

[slider2828]

I got it figured out. Im a god damn dee tha deee. I was plugin in the wrong numbers. I got the numbers from a guy with a actuator at 9 psi and mine is at 15 psi. not good:duh: and i didnt know turning it off would make it not work (i thought it would go to stock)
So I zeroed it out and it hits 16 now. just to let you guys know
low, set-0% , gain 13%, set gain 0 boost at 16
high, set-34%, gain 20%, set gain 27 boost at 19
19 is safe right. what the highest on 93 octane i can go?
Thanks guys

You sure that isjn't set boost, not set gain? I dunno I have a E01, but its close. whatever... make sure you just watch for boost spikes, as per set gain at 0 on low, can you increase that? That may reduce turbo lag a little...

[moses]

I can increase it but I dont mind the lag to much. Its my dd so i want to try and save a little gas. Thanks a lot for all your help though.
Is 19 psi ok, its 20 that is bad if you dont have race fuel, right?

[fliprayzin240sx]

Some one had a similar problem with theirs they englarged the W/G hole a bit and it solved their problem

You might look into this, GT2871Rs are notorious to boost spikes. Not because of the actuator or anything, but some engines produce more exhaust pressure than others. The smaller hole sometimes isnt big enough. Look at the size of the hole vs the size of the flapper, the hole is tiny. Mill it out close to as big as the the flapper to alleviate boost spikes.

I got it figured out. Im a god damn dee tha deee. I was plugin in the wrong numbers. I got the numbers from a guy with a actuator at 9 psi and mine is at 15 psi. not good:duh: and i didnt know turning it off would make it not work (i thought it would go to stock)
So I zeroed it out and it hits 16 now. just to let you guys know
low, set-0% , gain 13%, set gain 0 boost at 16
high, set-34%, gain 20%, set gain 27 boost at 19
19 is safe right. what the highest on 93 octane i can go?
Thanks guys

Umm, what are you tuned for? Would suck to push the engine to 19-20 psi when its not tuned for it.

Have you tried turning up the GAIN settings really high with the BC? Usually this fixes that issue.

I thought turning the gain up would cause the valve to stay shut longer and hold higher pressure steve?

I can increase it but I dont mind the lag to much. Its my dd so i want to try and save a little gas. Thanks a lot for all your help though.
Is 19 psi ok, its 20 that is bad if you dont have race fuel, right?

Again, comes down to how its tuned...might wanna double check on that before you blow the engine...

[moses]

I have a JWT tune for 740cc injectors, 300zx mafs, and 93 octane. Im sure I could get there with no problems. I just heard of some shops not tuning it at either 20 or 19psi because its not safe. Not sure why, but I think I will stay at 18.5 psi just to be safe.
I would like for someone to explain it to me and thanks for the advice about the small whole