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HOWTO: RB25DET High Boost mode with standard solenoid

paulr33

By paulr33,
in Tutorials / DIY / FAQ

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MotoMan Rising Star

MotoMan

Posted
Posted
Hi can anyone tell me if this mod works on the R32, Ive a 1990 GTS-t with the RB20det and an auto box running 10-11psi on full boost (according to aftermarket gauge) with full 3.5inch exhaust from the turbo including downpipe and de-cat and a pod filter. Sounds like a great mod but dont want to fry anything also is the solanoid in the same place on the R32. Thanx :banana:

R32 doesnt have dual stage boost... this is for RB25DET only :)

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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.

Posted Images

evesdropping Collaborator

evesdropping

Posted
Posted
it will be so much easier if someone displays a finishing job for those who arent to sure?

dude, there are pics all through this thread. There really isn't all that much to it. Just cut the wire shown in the pics and connect a ground to it. If it doesn't work just solder the wire you cut, back together. easy

DRD-00F Grand Master

DRD-00F

Posted
Posted

whats all this junk about burning out the ECU cause of a constant earth?

I have had this installed, and on, for about 6 months now... I have not noticed anything wrong with the ecu at all...

not to mention its a box that relays hundreds upon hundreds of 12V requests on an hourly basis...

1 12v being on all the time would have little to no effect on it at all...

LatinR33 Experienced

LatinR33

Posted
Posted

If my vac line runs straight from the cooler return pipe to the actuator will this do anything at all like bypass the solenoid and run off the max boost setting of the actuator?? Just dont want to do this and burn out the solonoid by having it open all the time.

innocente Newbie

innocente

Posted
Posted

I've just found out that on the R34, the solenoid opens as soon as your boost exceeds 0 psi. The solenoid is in place for when the ECU goes into "safe mode", it closes the solenoid so that the boost does not exceed 5psi. Sort of like a safetyy feature rather then a 2 stage. So there should be no improvement whatsoever on R34s for this mod. Unsure about the R33s though.

evesdropping Collaborator

evesdropping

Posted
Posted
I've just found out that on the R34, the solenoid opens as soon as your boost exceeds 0 psi. The solenoid is in place for when the ECU goes into "safe mode", it closes the solenoid so that the boost does not exceed 5psi. Sort of like a safetyy feature rather then a 2 stage. So there should be no improvement whatsoever on R34s for this mod. Unsure about the R33s though.

Definitely works on r33

drf33t Contributor

drf33t

Posted
Posted

Did this mod this morning works! i just cut the black wire as close as i could to the plug, attached a lug and bolted it straight onto the chassis. No soldering, no wire extensions. easy as. reccomended for all stock 33's :)

Richie33 Contributor

Richie33

Posted
Posted (edited)
Hi can anyone tell me if this mod works on the R32, Ive a 1990 GTS-t with the RB20det and an auto box running 10-11psi on full boost (according to aftermarket gauge) with full 3.5inch exhaust from the turbo including downpipe and de-cat and a pod filter. Sounds like a great mod but dont want to fry anything also is the solanoid in the same place on the R32. Thanx :)

The R32 doesn't have a dual boost setup... it allows full boost right through the rev range.

Edit: for some reason I thought I was on the last page, but I was on the second last page. (Can you delete posts?)

Edited by Richie33
so_tred Proficient

so_tred

Posted
Posted
I've just found out that on the R34, the solenoid opens as soon as your boost exceeds 0 psi. The solenoid is in place for when the ECU goes into "safe mode", it closes the solenoid so that the boost does not exceed 5psi. Sort of like a safetyy feature rather then a 2 stage. So there should be no improvement whatsoever on R34s for this mod. Unsure about the R33s though.

That's incorrect..R34's are the same as R33's - "dual" stage.

Plenty of people here have done it and can vouch for it working, myself included. I even have a toggle switch hooked up so there is no doubt that it works.

Standard = Boosts @ 4-5psi til around 4000rpm then jumps to 7-8psi..with the switch flicked it's boosting @ 7-8psi from around 2500rpm.

drf33t Contributor

drf33t

Posted
Posted
I've just found out that on the R34, the solenoid opens as soon as your boost exceeds 0 psi. The solenoid is in place for when the ECU goes into "safe mode", it closes the solenoid so that the boost does not exceed 5psi. Sort of like a safetyy feature rather then a 2 stage. So there should be no improvement whatsoever on R34s for this mod. Unsure about the R33s though.

just do it mate, you'll see! :thumbsup:

  • 4 weeks later...
innocente Newbie

innocente

Posted
Posted

I have done it. With a toggle switch with a light in-built. I have wired the setup in such a way that the light will light up when the solenoid is open. Switch on = light on = solenoid on (can hear the click). Switch off = light off but lights turn on when solenoid opens and solenoid opens the moment your pressure exceeds 0psi (have been monitoring it for more than a month now).

just do it mate, you'll see! :D
  • 2 weeks later...
nzm033 Proficient

nzm033

Posted
Posted (edited)

finally did it...boost comes on abit earlier, around 3000 to 3500rpm make full boost ( not excatly sure when it makes full boost, just tested qucikly)

i feel more low down torque in 1st and 2nd gear

does this sound right?

Edited by skyline17
webng Experienced

webng

Posted
Posted (edited)

I'm thinking of getting one of those Turbotech boost controllers, do I still need to do this mod? Was hoping for constant 9-10psi.

edit: ok, the answer would be no i don't. Anyone with experience with this boost controller? Is it a "legal" mod cops/insurance) Or should I just stick with the solenoid mod considering I'm not going to mod the turbo anytime soon.

Edited by webng
evesdropping Collaborator

evesdropping

Posted
Posted
how do i install a switch?

Get a switch that is 'single polarity dual throw' i.e.

on

off

on

There will be three positions on the back to connect the wires to.

The midddle is where you connect the wire to the solenoid.

The top and bottom positions are used for a wire to ground and the wire connected to the ecu (the other end of the solenoid wire that you cut.)

It doesn't matter which of these two go at either end.

I wired mine

ground

solenoid

ECU

this means that when the switch is pushed foward, the boost is controlled by the ECU,

when it is pushed back, the solenoid is grounded i.e. full boost always,

and when it is in the middle, it will always be low boost.

There is more about this earlier in the thread I think.

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