Rb25det Upgrades

[r33_crusier]

EY guys, was looking at soem things to do witht he stimulus money! yay, Looking at sourcing some GTR injectors, a GTR fuel pump, and a GTR Plenum. All these should work on the rb25? Any one got any info on this before i go do it. Any1 got any lying around they wann get rid of:D, Im 99% sure the injectors and the fuel pump would be fine, not sure about the plenum though. If anyone knows anything let me know

Cheers guys

Adam

[RubyRS4]

What other mods are you doing to support this upgrade?

Bigger turbo? Intercooler? Exhaust?

There are gains to be had with other mods done first.

[Damo_R34]

street, grip or drift? If its gonna be a streeter, forget the gtr plenum. And as Ruby said, list your current mods and people here can help you determine whats next.

[gtrkiet]

with stimulus money 900 bucks can get you,

555cc injectors - 500

bosch 040 fuel pump - 200

if you dont have this already, split dump/front pipe - 200

[r33_crusier]

What other mods are you doing to support this upgrade?

Bigger turbo? Intercooler? Exhaust?

There are gains to be had with other mods done first.

was going to do cooler n exaust and all the other stuff done at once then get it tuned.

[r33_crusier]

street, grip or drift? If its gonna be a streeter, forget the gtr plenum. And as Ruby said, list your current mods and people here can help you determine whats next.

ok so far i have done....... nothing lol!

got a boost controller, jst a manual one, running 10psi

my exhaust is going on very soon when i find some time to put it on, its a full turbo back 3" exaust with a split dump and a high flow metal cat & high flow muffler to keep it quiet.

then the cooler was going to be next, jst thought with the gtr plenum it would be easier to fit the piping then i dont have to go over the top of the engine.

then was going to do the fuel pump, and injectors.

I wasnt going to worry about a power fc, prob get a e-manage of get a r32 ecu and get it re mapped

The plenum was just a thought. Some one suggested it and i thought id ask.

Edited April 27, 2009 by r33_crusier

[Damo_R34]

why not use the money on spring/shock combo or coilovers and a good set of tyres?

[r33_crusier]

why not use the money on spring/shock combo or coilovers and a good set of tyres?

lol forgot about my coil overs. Got a set already, fully adjustable damper & height. I think there section spec rmia. Apparently there gud but i dunno they came with the car when i got them. And already got some 18" work emotion xt9 i think rims.

[Damo_R34]

sway bars? camber arms? decent tread?

[r33_crusier]

sway bars? camber arms? decent tread?

yea was looking at some sway bars, last night, they all do the same thing really dont they? wats and approx price i should look at paying for them? Well i think i got soem decent tread on the tyres, nothing spesh, but dont realli wanna spend $1000 on jst tyres. The ones on there grip pretty well already.

[RubyRS4]

ok so far i have done....... nothing lol!

... then the cooler was going to be next, jst thought with the gtr plenum it would be easier to fit the piping then i dont have to go over the top of the engine.

If you go a Cooling Pro stealth fmic kit, then you won't need the gtr plenum. The Cooling Pro kit uses the stock piping in the engine bay. Just seems a waste for a gtr plenum and injectors if your engine/turbo is pretty much stock.

Edited April 27, 2009 by RubyRS4

[Krishy]

EY guys, was looking at soem things to do witht he stimulus money! yay, Looking at sourcing some GTR injectors, a GTR fuel pump, and a GTR Plenum. All these should work on the rb25? Any one got any info on this before i go do it. Any1 got any lying around they wann get rid of:D, Im 99% sure the injectors and the fuel pump would be fine, not sure about the plenum though. If anyone knows anything let me know

Cheers guys

Adam

As far as i was aware RB26 injectors are top feed and RB25 injectors are side feed....so thats a no no to that plan Adam...but you can definately fit a GTR fuel pump...ummm i wont change the plenum as it flows well for above 300+rwkw so why bother changing what doesnt need to be changed....get your cooler, exhaust, give it a good servicing with irridium plugs regapped, and then you can crank it up to 12 psi....and you will definately feel the difference then....

good luck with it mate

[DamageInc]

gtr plenum on a gtst is a kent of a job to do and gtr injectors wont fit , and they are only 444cc , your better off buying some nismo 555cc or 750cc and an aftermarket fuel rail ,

after having a gtr motor and now having a 25det im gonna keep the stock plenum , most of the time youll find that stock parts are good for decent power as krishy said

[Krishy]

gtr plenum on a gtst is a kent of a job to do and gtr injectors wont fit , and they are only 444cc , your better off buying some nismo 555cc or 750cc and an aftermarket fuel rail ,

after having a gtr motor and now having a 25det im gonna keep the stock plenum , most of the time youll find that stock parts are good for decent power as krishy said

if your after upgrading your injectors i would say keep your standard fuel rail as that flow's just as good....i know as i am still using my stock fuel rail and its no problems so far...its the injectors that will be causing the issue not the fuel rail....my stocko injectors made 196rwkw on 13psi....so they have a decent flow....and it wasnt even leaning out at that stage

[pkblade]

Yeah if your staying side feed no need for aftermarket fuel rail

....a full turbo back 3" exaust with a split dump and a high flow metal cat & high flow muffler to keep it quiet.

with most aftermarket exhaust systems will need more than one muffler to keep the dB's legal

then was going to do the fuel pump, and injectors.

I wasnt going to worry about a power fc, prob get a e-manage of get a r32 ecu and get it re mapped

an aftermarket computer or remap will be required to control the injectors and keep the A:F ratio in check.

[RubyRS4]

with most aftermarket exhaust systems will need more than one muffler to keep the dB's legal

+1

I run a 3" system with hi flow cat, berklee box resonator and 5zigen muffler and its a nice quiet note, tested with a meter at 90dba. Had the car in the workshop 3 times until I was happy with it.

Edited April 27, 2009 by RubyRS4

[nos man]

so a rb26 plenum would fit on a rb25? i didn't know that i always thought because rb26 plenums have seperate throttle bodies you need an adpter which costs alot to run it or something! not sure and gtr injectors are top fed not side fed and you're better off going with a aftermarket fuel pump if it's only gonna cost you a few more pennies!

[Krishy]

so a rb26 plenum would fit on a rb25? i didn't know that i always thought because rb26 plenums have seperate throttle bodies you need an adpter which costs alot to run it or something! not sure and gtr injectors are top fed not side fed and you're better off going with a aftermarket fuel pump if it's only gonna cost you a few more pennies!

GTR fuel pumps flow well till about 300 rwkw anyway so decent upgrade without the $$$

[shy_s6]

put your exhaust and cooler on. dont bother with inectors or plenum (if you got the plenum it would need to be modified then also custom piping for the cooler, most cooler kits are to suit the standard style plenum) injectors are plenty for what your chasing and you can always buy a fuel pressure regulator n run more pressure increasing the output of injectors

go grab a bosch 040 or gtr pump, new K&N element filter for your airbox, some new spark plugs gapped down to .7 (iridium are ok but a waste of money better going the cheap copper plugs and changing them every service) then call jeff from 'the speed lab' and get her booked in for a remap tune her at 13psi this should give you enough poke to keep you happy for a while

Edited April 27, 2009 by shy_s6

[nigelswazi]

so a rb26 plenum would fit on a rb25? i didn't know that i always thought because rb26 plenums have seperate throttle bodies you need an adpter which costs alot to run it or something! not sure and gtr injectors are top fed not side fed and you're better off going with a aftermarket fuel pump if it's only gonna cost you a few more pennies!

The RB26 Plenum only fits a RB25 with an adaptor plate which can be very expensive to buy/make and really not worth it. JMS are selling a whole kit complete with the GTR plenum for almost $2k! Its not really worth doing as the problem with running the adaptor plate apart from space is the atomisation of the fuel as the GTR plenum positioned the injectors for optimal location to get perfect atomisation into the cylinder. By using an adaptor plate you are spacing the GTR plenum away from the head which in turn positions the injectors further back. A friend of mine did this mod and ended up selling all the bits because he wasn't happy with the results for all the cash he outlayed and had better results from a Greddy Plenum for a RB25 with a bigger throttle body.

As everyone else has stated do the smaller mods first based on a cost vs benefit. There are plenty of cheap mods that make a decent difference as everyone has pointed out. For a grand I would buy + fit cat back exhaust, fmic/larger side mount, rear swaybar, bleed valve, half decent front brake pads like Ferodo Formula $125 Trade makes your car feel faster as you can confidently brake later. If your fuel pumps stuff swap that for the brake pads.

You wont need bigger injectors if you are running stock turbo

You wont need to upgrade plenum unless you are running way more power than stock plus its one more thing to change if you get defected so why bother

Edited April 28, 2009 by nigelswazi