HOWTO: RB25DET High Boost mode with standard solenoid

[Kennedy]

10 should be fine. Most guys hit R&R around (13-15) on average. Mines on 10 now and its fine. (Also have a/m fuel pump and fuel pressure regulator though) It would be safe to upgrade your pump if you wanna run 10Psi.

[Ultimategtr]

hmm im goin go to mod mine tonight R3325t

im going to wire up a 2 way switch in cabin. Ill post pics if you guys want... flick for hi or low boost.

[Ronin33]

[im going to wire up a 2 way switch in cabin. Ill post pics if you guys want... flick for hi or low boost.]

Gday Ulitimate,

Postin picks of the two way switch would be great!!

look forward to it.

[Kennedy]

Three way switch you mean...

2 for wire going from ECU to the actuator. One for the ground.

[Ultimategtr]

i dont get the 3 way switch.. ?

heres how i see it.. instead of just joinin a wire from the black one to a ground(not choppin the wire off).. y not have a switch in the ground so you can control it.. ie.. when switch is in on position, it is grounded, thus the hi boost is always on... and when switch is in off position, the ecu thinks as if nothings happened and carries on with the 2 stage boost..

is the above not correct?

[Ronin33]

eveing Ray,

Thats my job for tomorrow!!!

I had an idea thats what you meant but good get confirmation!

Cheers

[Ultimategtr]

Ronin are you goin to try that switch method?

anyone else? the switch has to work! i dont c y u need the 3 way switch :S

cheers

[frx026]

I think this is the info you are looking for..

There is another way to do this with exactly the same results. The only difference being that it is not visable inside the engine bay, or if wanting to use a switch can be done from inside the cabin. ( no running wires through the firewall)

Items required

wire ( different colors prefered)

Spade conectors

12 v 30amp changeover relay

on/off switch

Tools required

- wire cutters

- wire crimpers

Time taken about 30 min

This involves cutting wores directly from the ecu located in the passenger kickpanle. if you are not able to, or are not sure of which wire to cut, DONT do this!

1 - Remove passenger kickpanel

2 - on ECU locate plug second from bottom ( while it is still mounted in car)

3 - locate light green wire coming from this plug.

4 - cut wire

5 - install relay

Wiring for relay is:

30 - to green wire car side

87a - to green wire ECU side

87 - to pin 86 on this relay

85 - accessory 12v

86 - switch

6 - install switch

Wiring for on/off switch

pin 1 - to pin 86 of relay

pin 2 - earth

7 - reassemble car

8 - test drive

When the switch is in th ON position you will have high boost mode all the time, when the switch is off, it will run as a standard car ( hi/low boost mode)

Notes:

- Test car was a R33 series 2 - check wiring colors on other models before proceding

- Make sure all electrical connections are insulated

- make sure that all wiring is secured and cannot be damaged by normal operation of the car

[Ultimategtr]

yer i read that... BUT wouldnt just a switch be the easier way? i mean hook onto the black wire.. run it through the firewall and screw it somewhere near the kickpanel under teh steering wheel?

[Kennedy]

yer i read that... BUT wouldnt just a switch be the easier way? i mean hook onto the black wire.. run it through the firewall and screw it somewhere near the kickpanel under teh steering wheel?

Could work..let us know. My setup was very similar but used a 3 way which was mounted in the cabin.

Here is the switch i used from DS.

Fits perfetly into the removable slot behind the windscreen wiper.

[BAMR33]

What you can do is grab one of your airbox bolts (if airbox is removed) and earth the wire to the existing holes, thats what I did anyway and works fine. This is a great DIY mod, wish there were more that worked this well.

[Ronin33]

Morning Ray,

Wow this topic has taken off hasnt it!!!

Yep i had plans to but a 13 month old whirlwing hit the fridge.

Hopefully i will get to try it this weekend.

If not im just going to ground the black wire.

Cheers

[Sambo33gtst]

I just did this mod (it was the black wire) and i could tell straight away, feels so much stronger down low. This is in a series 1

Funny thing is, i was at work and we had a sparky doing our securty system, he did pretty much all of it for me...and when i got back from a strap, he said he'd done it for 2 other 33's hahaha !

[NYTSKY]

Can someone please post some pics and a step by step as i found the first example a bit hard to understand.

Am i suppose to just cut the black wire and ground it? Where is the solinoid anyway?

Im very new to skylines so all input is appreciated.

CHEERS

[dezz]

thats exactly what you do

the stock solenoid is behind the airbox

[NYTSKY]

Thanks mate.Do i ground the cut wire attatched to the solinoid or the one that runs away from it?

[dezz]

when u cut the black wire, you ground the half thats running into the solenoid

[NYTSKY]

Thanks dezz.Alot clearer.

[NYTSKY]

Just went down and had a look.And im still stumped.Not use to turboed engines so i dont know what im looking at.Any chance of pics anyone?

CHEERS

[dezz]

there's pics in this thread...look through the pages and you'll see pics of it done on a few peoples cars, grounded to different spots etc