HELP: PowerFC boost controller Install

[zinkrb250]

What's up fellas,

I'm in the midst of installing the PowerFC boost controller and I'm having trouble. Pictured below is the Apexi boost solenoid... the plug I'm holding is the problem... I don't know where it goes!! The black and pink wire plug from the solenoid connects to the red and brown plug... I'm holding the other end of the red and brown extension... I JUST NEED TO KNOW WHERE THE HELL IT PLUGS TO?????

[Sydneykid]

All the wiring harness plugs (for the MAP sensor and the solenoid) on the Boost Control Kit (BCK) go back to the Power FC itself.

[zinkrb250]

All the wiring harness plugs (for the MAP sensor and the solenoid) on the Boost Control Kit (BCK) go back to the Power FC itself.

That was my initial thought too... but upon further inspection of the PowerFC... there's only outlets for the engine harness, the hand controller, and the sensor that T's into the FPR vacuum line.

[Sydneykid]

That was my initial thought too... but upon further inspection of the PowerFC... there's only outlets for the engine harness, the hand controller, and the sensor that T's into the FPR vacuum line.

What model Power FC is this?

[zinkrb250]

What model Power FC is this?

RB25DET

PowerFC

Ver 5.10

FC Commander3

Ver 5.01

Serial #: PFCECR33010-1212

Does the apexi boost solenoid require power to function? If so... then this must be the plug that supplies power.... and if in fact this is the plug that supplies power... where would it get it's power source from? Maybe I'll have to splice these wires from the solenoid into a power source?

[zinkrb250]

This is a diagram of how to hook up the AVCR... but the solenoid and the pressure sensor are relatively the same as the boost controller for the PFC....... the AVCR comes w/ a harness that hooks up the the pressure sensor and the solenoid, runs through the firewall and splits to the AVCR and then to the ECU.... at the ECU you have to splice in power, rpm, blah blah blah.... so i'm starting to think that since I can't find a place for that plug.... I'll have to splice it into a power source and ground.... any thoughts?????

[RB power]

hi doesnt the white plug, plug into the factory boost soleniod plug?

[zinkrb250]

hi doesnt the white plug, plug into the factory boost soleniod plug?

Probably... but there's just one problem... I never had a factory boost solenoid... I have no clue where the plug for the factory solenoid is either (not sure if it's even on my harness anymore.... i had mckinney motorsports splice my s14 and rb25 harness together)

Does anyone see if there would be problem if i were to splice these wires into a power source and a ground?

[zinkrb250]

Probably... but there's just one problem... I never had a factory boost solenoid... I have no clue where the plug for the factory solenoid is either (not sure if it's even on my harness anymore.... i had mckinney motorsports splice my s14 and rb25 harness together)

Does anyone see if there would be problem if i were to splice these wires into a power source and a ground?

I just talked to Apexi-usa and a tuner shop here in the states... apexi told me that white plug was supposed to connect to (not sure on this) either the factory boost box.... or the plug that goes to the factory boost box which is all routed through the EFI harness back to the ecu...

The tuner shop told me...

wiring this to a power source and a ground, although would give it power, wouldn't not work because the ecu (powerFC) needs to adjust the voltage under boost (something along those lines).... so i'm going to have to splice the two wires from the apexi solenoid into the EFI harness.... I'm waiting to call my tuner back later today... he's supposed to be looking over the wiring schematics and walking me through which pin to splice into.....

Any of this sound all right??????

[Sydneykid]

On an R33GTST RB25DET the standard boost control solenoid wiring is included in the same harness as the AFM wiring. Have a look around that wiring harness and you should find it. If not, then you will have to connect (run a new wire) the earth back to the ECU pin, the positive goes to a switched (with ignition) power source.

[zinkrb250]

On an R33GTST RB25DET the standard boost control solenoid wiring is included in the same  harness as the AFM wiring.  Have a look around that wiring harness and you should find it.  If not, then you will have to connect (run a new wire) the earth back to the ECU pin, the positive goes to a switched (with ignition) power source.

Thanks for your help so far SK.... downloaded this wiring diagram of the rb25 (r33)

the red line traces from the boost solenoid to pin 25 on the efi harness. (light green wire) I had a look at my harness and not to my surprise... that very wire was clipped....

So now that i know what needs to be done i have a few questions....

The Apexi solenoid has 2 wires... red and black... which would you think to be the ground and which would you think to be positive?

Next, would you suggested any power source in particular that is switched with the ignition? Maybe my flex-a-lite fans which are wired to turn on whenever i turn my key to the "on" position.

[lucky_cefiro]

most typically, red is positive and black is negitive, gorund in this case.

[Sydneykid]

I don't think it matters which way the solenoid is wired, but I would go for black to the ECU and red to the + power source. You could use the 12 volts switched, positive that supplies the AFM, it's close by where you will mostly likely mount the boost control solenoid. It doesn't draw much current, so it shouln't be a problem.