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R33 dual stage boost how do you bypass

craz0

By craz0,
in Engines & Forced Induction

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strutto Grand Master

strutto

Posted
Posted

You haven't stated if you want the single stage to be the high or low boost setting...

If you feed the standard boost solenoid a constant 12V, it will constantly run high boost...

If you remove the standard boost solenoid and its associated plumbing, it will constantly run low boost...

strutto Grand Master

strutto

Posted
Posted

Hmm... I think a better way of describing it would be to say, a constant 12V whilst the ignition is on...

The solenoid has 2 wires and is located near the factory airbox... I can't exactly remember because mine is long gone but it will work in one of two ways...

1. One wire connected to ground at all times and the other wire supplied with 12V when the ECU tells it to... (> 5000rpm)

2. One wire constantly supplied with 12V and the other wire grounded when the ECU tells it to...

In the case of 1, you will need to find a 12V ignition source and feed it to the appropriate wire on the solenoid... I can't reccomend any particular source, but something from the fuse box should do...

In the case of 2, the simplest way would be to constantly ground the appropriate wire by attaching it to the car body...

Either way, the idea is to get an ignition switched 12V source to one of the wires, and a constant ground to the other...

paulr33 Grand Master

paulr33

Posted
Posted

if you have an apexi rsm you could set its rev output at like 2500 rpm and run the 12v wire (the rpm output wire) to your factory boost solenoid so when the rsm reads over 2500rpm it flicks on the output relay which is 12v, which should in theory open your solenid (if wiered properly). you would then have to run the other wire to constant ground.

does this sound correct? would this work? the output wire is 12v, 200ma

paulr33 Grand Master

paulr33

Posted
Posted

sorry, ive just re-read the manual. the rsm rev output signal is a switching ground.

so you would need to feed the solenoid 12v from somewhere and give it the rsm rev output wire and set its rev0 value to like 2500 or something small so its always open and gives you 7psi. or you could just hotwire (run 12v from somewhere else) to be always on even at 0rpm

paulr33 Grand Master

paulr33

Posted
Posted

yeah thats it's intended purpose. the factory boost solenoid has two wires, white and black.

do you know which one is which? im guessing one is to ecu to do the grounding @ 5000+ and the other is to 12v constant

strutto Grand Master

strutto

Posted
Posted
The solenoid has 2 wires and is located near the factory airbox... I can't exactly remember because mine is long gone but it will work in one of two ways...

Nope still can't remember...

I would assume that black is ground and white is hot...

Guest INASNT

Guest INASNT

Posted
Posted

Instead of ***ing around with earths and 12v wires, and since u want to run high boost which is around 8psi y dont u just get yourself a cheap bleed valve and and leave it still at 8psi. Then u can simply disconnect the hoses and plug from the stock boost solenoid and be done with it!

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