R33 dual stage boost how do you bypass

[craz0]

How do you bypass the standard R33 dual stage boost to make it single stage?

I have done a search but all I seemed to come up with was to install a bleeder.

[strutto]

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...

[craz0]

I wanted to run High boost, so what is the best way to run a constant 12v to the solenoid?

Thanks for your reply:)

[strutto]

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]

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]

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

[strutto]

Im not sure how much current the solenoid draws but I would imagine it would be over 200ma so you would want the switching to be done with a relay...

I have my RSM rev output activating a shift light BTW...

[paulr33]

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]

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...

[craz0]

Thanks guys:)

[Guest INASNT]

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!