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HOWTO: RB25DET High Boost mode with standard solenoid

paulr33

By paulr33,
in Tutorials / DIY / FAQ

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guricha Collaborator

guricha

Posted
Posted (edited)

thanks for this mode:) its working i jast change graunding place :laugh: now in second gear shows -8 PSI:) thanks again

Edited by guricha
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paulr33
paulr33

HOWTO: RB25DET High Boost mode with standard solenoid Intended Audience: Stock RB25DET owners Technical Level: Very Easy Duration: 5 minutes Effort: Easy Result: Fairly Good !!!Caution/Ach

Sciby
Sciby

Reset the computer by disconnecting the battery, put the brake pedal few times (to ensure there's no residual charge), then reconnect the battery. Good idea to take it for a good drive now, so it rema

Sklyn
Sklyn

Karu it doesn't matter because you won't use the solenoid at all once you install a boost controller. And with stock ecu and turbo do NOT run over 12 psi, naybe even 10 depending on your car.

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R33LIN Collaborator

R33LIN

Posted
Posted (edited)

hey all,

the idea of the switch is a good idea to control when you want highboost or when u want two stage boost.

ANYONE got pics of their switch, or installation of the switch that they could post up.

assuming you cut the black wire and ground it, without using a switch.

just a quick question?

is this mod reversible? like if u want the two stage boost again without using a switch. further down the track could u reattach/solder the black wire through its original path again? or is stuffed once cut?

hopefully someone can help?

Cheers :laugh:

Edited by R33LIN
XRAIDER Enthusiast

XRAIDER

Posted
Posted
hey all,

the idea of the switch is a good idea to control when you want highboost or when u want two stage boost.

ANYONE got pics of their switch, or installation of the switch that they could post up.

assuming you cut the black wire and ground it, without using a switch.

just a quick question?

is this mod reversible? like if u want the two stage boost again without using a switch. further down the track could u reattach/solder the black wire through its original path again? or is stuffed once cut?

hopefully someone can help?

Cheers :laugh:

I would imagine that you could solder the wire again, I just bought a 4 buck switch from supercheap, and mounted it in the dash I drilled a hole in the removable pushout panel thing, its just a simple on off switch,

I cbf running the wire through the firewall so i ran it next to the loom that follows the strut and continues to the wiper motor, then into the gaurd and the door, i know crap way of doing it but it works, BTW heres a pic or two! :)

post-33491-1170834217.jpg

post-33491-1170834277.jpg

  • 2 weeks later...
so_tred Proficient

so_tred

Posted
Posted (edited)

Just did this on my R34 this afternoon, it works..it's now hitting 8psi at about 2,500rpm.

Will be hooking up a switch next weekend to switch between high boost & low/hi boost.

Also, in the pic it looks like the black wire to the plug is still connected but it's not - it's just tucked back into the black surround.

Question:When I put on a full turbo back 3 inch exhaust this will be rendered unnecessary, correct?

post-26304-1171789765.jpg

Edited by so_tred
Nismo_God Veteran

Nismo_God

Posted
Posted

Hi all. Is there anyone from sydney who has done this mod that wouldnt mind helpingme out. i live in the liverpool area and dont feel confident enough to start cutting wires. let me know.....there will be an ice cold six pack in it.

dezz Grand Master

dezz

Posted
Posted
Question:When I put on a full turbo back 3 inch exhaust this will be rendered unnecessary, correct?

No. The only time it will be unnecessary is when you have some form of boost controller that will be bypassing the stock solenoid.

DRD-00F Grand Master

DRD-00F

Posted
Posted
Hi all. Is there anyone from sydney who has done this mod that wouldnt mind helpingme out. i live in the liverpool area and dont feel confident enough to start cutting wires. let me know.....there will be an ice cold six pack in it.

drive to Turramurra and ill do it for you :(

Im outta switches though...

MotoMan Rising Star

MotoMan

Posted
Posted
Hi all. Is there anyone from sydney who has done this mod that wouldnt mind helpingme out. i live in the liverpool area and dont feel confident enough to start cutting wires. let me know.....there will be an ice cold six pack in it.

Seriously man... its the most simple job ever...

I just shoved a cotter pin down the back of the plug.. and grounded it to the airbox.. I can remove the mod within seconds and no cutting wires at all

so_tred Proficient

so_tred

Posted
Posted
No. The only time it will be unnecessary is when you have some form of boost controller that will be bypassing the stock solenoid.

I thought if the boost solenoid was left standard and I added a full exhaust which usually will up the boost by 2psi then the solenoid would be made obsolete?

so_tred Proficient

so_tred

Posted
Posted
no, instead of being 5psi/7psi (on an R33, not sure if its the same boost on R34's?) it will then be 7psi/9psi

I hoped it would be like that :P

So it's been tried & proven to be that way?

MotoMan Rising Star

MotoMan

Posted
Posted

As far as im aware.. my exhaust is only catback.. However im running around 9.5 PSI... Blitz Turbo timer tell me 0.71 kg/cm2 (which equals 9.5psi) and just installed a boost gauge.. it also reads just under 10 psi

Is that possible with only catback?

Before the mod it was 7/9psi

adamR33 Apprentice

adamR33

Posted
Posted

hey i did this on my 33gtst and its poping and crap well by the way its a S1 4 speed auto , 600x300x75 intercooler and a 3.5inch stainless from cat back and i did this thing by cut the black wire and the black wire onto the car body and the black wire from the computer taped to block it . now took it up the street and it will get to 5 psi then it will just back fire and pop and jump or what ever eles .. then i put it all back to normal then it was fine . i wanted to do this thing , but can anyone tell me how to solve this problem . or anyone from lismore or ballina . cheers, adam

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