Wiring In Boost Solenoid For Link G4 Plugin On Rb25

[robbo_rb180]

I am about to wire in a solenoid for my rb25, the factory wiring has been removed/shortened/missing.

I have found the factory output wire on the ecu connector but need +12V Ign.

Am I able to use either pin 49/59 as they are switched from eccs relay for the +12V or am I better of running a wire from the Ignition?

[GTSBoy]

Why not look at the original wiring diagram?

[WMDC35]

As above, wire the mac valve to the original solenoid wiring

[robbo_rb180]

Why not look at the original wiring diagram?

As above, wire the mac valve to the original solenoid wiring

got the diagrams and looked over them that's not the issue

who ever did the engine conversion originally, removed half the pins from the engine loom.

I've got the wire on the ecu for the solenoid now I just need +12V. just wanted to keep it neat by using a +12v from ecu

[GTSBoy]

But that's the point. Find out, from the original wiring diagrams, where the factory sourced their 12V from, and do the same as that. They won't have done whatever they did for a bad reason. They would have done it for a good reason. If you source it from the ECU you might introduce some nasty noise into the ECU (from the valve square waving on and off) or you might draw more current than it can handle on that line or any number of other foreseeable (or not foreseeable) possible bad things.

Follow the factory's lead, avoid those possible problems.

[robbo_rb180]

too easy, found a fused IGN +12V not far from ecu.

[B-rice]

Just another question does the MAC solenoid have an outputing voltage or its and inputing voltage. Im asking this because if i sourced the 12V IGN source from the factory solenoid. Where does the second wire go analog/ digital input or ???

[GTSBoy]

The solenoid doesn't care how it is switched. You could either give it permanent 12V on one side and switch it on the earth side, or give it permanent earth on one side and switch 12V onto it from the other.

BUUUUUT...... What really matters is how the ECU wants to switch it. And from what your first post says (assuming you're correct), the ECU will switch the earth side of the solenoid to earth. So the second wire from the MAC valve just connects to the boost control pin on the ECU.

[B-rice]

ok i wasnt understanding how it was completing the circuit without the ground. So its connected by 12v then the second wire goes to the ecu boost controll pin. How is the ECU controlling the solenoid, is it applying varied voltage to the solenoid.

[89CAL]

Pulse Width Modulation

Switches on and off rapidly or less rapidly depending on conditions

[B-rice]

lasty is there anyway that it was be wired on the Auxillary loom?

[89CAL]

Why can't you use the stock wiring for the stock boost solenoid?

From what I can see you cant wire it to the expansion connector.

[GTSBoy]

1st post said the stock wiring had been pulled.

[B-rice]

nah this is a different case i have stock wiring. Went to a local meet and was told the same to use stock wiring where the old one was located so thats good if said more than once. Just didnt want to start another thread. Not sure if using thw stock will support the boost by gear functions but for now im happy will just wire it on the stock solenoid

[ARTZ]

yep wire to stock. Easy

[GTSBoy]

Sorry. Didn't realise was a new person. Just flicking through too quickly.

[89CAL]

Why wouldnt it support boost by gear function? Its just an ECU output. Duty cycle will depend on whatever the ECU wants to do