Not holding boost after fitting FMIC

[YOYO]

Hey all, have a small problem here after fitting my new FMIC kit (Blitz LM) to my 180sx. Everything bolted up nice and well and all hose clamps are secure. Took it for a spin immediately afterwards, and noticed that after hitting the set boost of 1bar (14psi) it immediately tapers off to 0.7bar (10psi).

Any ideas on what it could be? I'm using a profec A at the moment, and I suspect it could be a simple case of the solenoid simply not holding boost. But I'm still open to suggestions on any other things I might have missed. We checked all hose clamps and blocked off both the plumb-back point of the stock BOV, and the vacuum lead to the stock BOV.

BTW, 10psi is the lowest I was running before, due to mods, so maybe it has something to do with that??? No idea......

[Silver_r33]

What turbo are you running? T25g? When does the boost start to taper off, immediately, or just as you rev it higher? Try disconnecting the EBC and see how boost goes then. If it still tapers off, it could be the stock turbo running out of puff, or a boost leak.

[YOYO]

Yep, I'm running a stock T25g. As soon as the EBC reaches set boost, the wastegate immediately opens and I'm left with 10psi for the rest of the rev range. Whereabouts should I look for a boost leak? I suspect that's not the cause because the engine can get up to 1bar fine, but after that it drops quickly to 10psi.

[TTT]

reset your boost controller.

you know how you reset it and it makes you go through the boost settings again..

if you want the instruction's, I have the manual in PDF format I can email you.

[BHDave]

As gtst said, The profec A is a fuzzy logic controller that supposedly learns to hold boost settings.

Reset and set it learning again

[YOYO]

Thanks for the offer GTST, but I've already downloaded the manual. I'll get around to resetting the settings shortly. Do I have to make the profec relearn every time I disconnect the power?

Oh yeah, even tho I have the instructions, I have absolutely no idea how to get it into automatic learning mode (the instructions are rather vague) ... any help appreciated!

[YOYO]

Got around to relearning the profec A last night, after I figured out how to get into P1 and P2 learning modes. Unfortunately the boost still tapers off at higher revs. On the good side, it isn't an immediate drop anymore, but rather a more gradual drop. I'm still open to any suggestions!