HOWTO: RB25DET High Boost mode with standard solenoid

[Gts25Tom]

I cant wait to try this mod but one burning question bothers me. Why Why WHY did nissan make the r33 with dual stage boost to begin with? They've ruined the low RPM power and for what? Fuel economy? Yeah right. Better turbo/internal reliability? Possibly, but the engine is clearly capable of handling 7-8psi no problems. Does anyone know of any other factory cars with dual-stage boost?

[dezz]

probably for the longjevity (spelling?) of the turbo etc...contrary to popular beleif, GTS-T's aren't race cars from the factory...sure they aren't slow, but they're not GTR's

[huddy]

Hi there

i have a stagea RS4 with rb25 NEO in it.

I have cut the black wire,

taped over the side of the ecu,

and extended and earthed the side coming from the solenoid.

I have earthed it on the strut tower bolt (front strut bolt), above the strut bar and below the bolt thingo.

IS THIS CORRECT?

AND IS THIS A RELIABLE EARTH?

pic ->

thanks

-Matt

[paulr33]

that looks fine from what i can see

it should be obvious if it works

the only reason i think of dual stage

is to give the user more of a turbocharged experience

that is, self made lag or less response, then better response/top end

[Topkart R33]

that looks fine from what i can see

it should be obvious if it works

the only reason i think of dual stage

is to give the user more of a turbocharged experience

that is, self made lag or less response, then better response/top end

I would have thought it is there for safety issue....boost not so agressive down low so it drives smoother in the wet???? JMHO

[Kennedy]

its just the crazy japs and their sometimes pointless hi-tech technology

[Gts25Tom]

Worked like a charm. I did it yesterday and the car feels a lot more responsive. I highly recommend doing this if your running stock boost.

[bradstaR33]

hi all,

I wired this mod up this morning, works well. I wired it to an {on/on} switch inside my car. This allows me to flick the switch one way which puts it to standard where the ECU grounds the solenoid at 4500rpm, and when i flick the switch the other way it grounds the solenoid straight away so it opens and i have full boost as soon as i put my foot down,

Thanks for the mod,,,,!!

[Kinks]

^^ I have recently done exactly the same thing. Pickup is improved, stronger midrange. It's not a HUGE difference but it does feel better.

Would much prefer to be running 14.7psi all the time though

[DevilsHatred]

hi all,

I wired this mod up this morning, works well. I wired it to an {on/on} switch inside my car. This allows me to flick the switch one way which puts it to standard where the ECU grounds the solenoid at 4500rpm, and when i flick the switch the other way it grounds the solenoid straight away so it opens and i have full boost as soon as i put my foot down,

Thanks for the mod,,,,!!

yeah im going to do the same thing on my Stagea once i get it home jsut bought it waiting for the 4 brand new tyres and RWC then pick it up for some thrashing

cheers to the original poster. and whoever thought of this idea.. i just hope it works as good as everyone elses

[GtsTs2UK]

This mod was great, just wanted to join and say it worked a treat, though shes sat outside due to a bananad manifold....... lol...

Great performance for 5 mins work!!! Very easy to do...

Thanks and Merry Christmas all!!!

Edited December 21, 2006 by GtsTs2UK

[LightAssassin]

Did this out of boredom even though my boost controller goes in when the boost gauge goes in.

I believe the dual stage is there for safety reasons, not all Japanese owners would be race car drivers and people came in my car would shit themselves at 5 psi. Also, went for a run to test it all out, went off in first and where I usually just planted it and grabbed traction instead it just gave some wheel spin. Boost comes on around 2750... so I can see why 5 psi is there till 4500rpm as it has less of a "BOOST JUST KICKED IN Y0" and more of a "fast... ohh my 4500rpm... FASTER".

cheers for the simple mod, improve the mid range by far for some quick shits and giggles.

[Darkboy]

After reading right through this topic...I've noticed too many people listing different figures regarding the PSI pressures/readings for the stupid stock boost gauge.

Well here are the 'correct' numbers.

mmHg x100

------------------------------------------------------------------

- 7 = (PSI) 0 = (Bar) 0.0000000

1/4 = (PSI) 3.383936519 = (Bar) 0.2333142

0 = (PSI) 6.767873037 = (Bar) 0.4666284

3/4 = (PSI) 10.15180956 = (Bar) 0.6999426

+ 7 = (PSI) 13.53574607 = (Bar) 0.9332568

Well I decided to try this small mod last night...and I'm quite surprised actually how different...and better the car feels.

Great Stuff!!

Edited January 4, 2007 by Darkboy

[guricha]

should i swich off battery before cutting black wire?? please help

[paulr33]

no need to disconnect the battery, its fine to do.

just make sure the car isnt running to be safe

[guricha]

I try this mode few hours ago but absolutely no changes it still working till 4500-5000 on 5PSI and than 7-8 PSI, what i done wrong??please help.... and when gauge should show on second gear or third??? or it dipends on RPM????

[XRAIDER]

Ok after being confused with mmhg , and psi readings i decided to , and found this converter,

http://not2fast.wryday.com/turbo/boost_converter.shtml

I am not sure how accurate this is but give it a go and see what you can make of it!

[Kinks]

Well here are the 'correct' numbers.

I don't agree with all your figures.. the dial sits at 0 with ignition on and engine not running, so it can't be producing 6psi of boost

mmHg x100 (relative)

------------------------------------------------------------------

- 7 = (PSI) -13.5 = (Bar) -0.92

1/4 = (PSI) -6.8 = (Bar) -0.47

0 = (PSI) 0 = (Bar) 0

3/4 = (PSI) 6.8 = (Bar) 0.47

+ 7 = (PSI) 13.5 = (Bar) 0.92

[XRAIDER]

I don't agree with all your figures.. the dial sits at 0 with ignition on and engine not running, so it can't be producing 6psi of boost

mmHg x100 (relative)

------------------------------------------------------------------

- 7 = (PSI) -13.5 = (Bar) -0.92

1/4 = (PSI) -6.8 = (Bar) -0.47

0 = (PSI) 0 = (Bar) 0

3/4 = (PSI) 6.8 = (Bar) 0.47

+ 7 = (PSI) 13.5 = (Bar) 0.92

Yea thats the figure I got with that link, but i wasn't to sure if it was correct, anyway i'm about to do this mod will let you know if i can get it to work! :sorcerer:

Edit: Wow I just finished doing this with a switch, man it works well, much more low down power over all im happy with it, i like the idea of using the switch so when it rains back to 5.

Cheers

Edited February 4, 2007 by XRAIDER

[Kinks]

After doing the mod and spending the first week doing nothing but fiddle with my toggle, I left it in "standard" mode until the other night.. nice cool dry weather flipped the switch and I was grinning like a little kid after a few seconds.

worth keeping in reserve for special occasions sometimes, otherwise you risk spoiling yourself every day