Injectors +)

[butch]

what injectors would you use ?? has anyone converted gtr injectors or can point me in the right direction . not looking at spending 1300 on sard injectors . cheers !

[R31Nismoid]

for what setup?

[butch]

rb30 bottom end 25 det top end . runnin kkr 560 greddy plenum and 90 mm tb ?? compression ration 9: 1 :1

[R31Nismoid]

S15 injectors are 440. a KRR 560 will be lucky to max those IMO.

[butch]

i've decided to go gtr injectors n fuel rail . whats the difference between the injectors flow wise gtr vs gtst .And the Fuel rail ?? HelP!

[N1GTR]

You'll see 440hp from both. Watch the duty cycle.

[Craved]

arent the 33 gtst injectors 370cc versus 440 for GTR ?

[butch]

thanks fellas so whats the go with the fuel rails ?

[R31Nismoid]

You do realise there is more than just the fuel rail that needs changing yes?

They are different impedance...

[Adriano]

Does the rb25 manifold have the mounting lugs for the rb26 rail?

[D_Stirls]

It'll have to be a custom rail and you will have to wire in the dropping resistor for the injectors if you use anything GTR as they are low impedance.

[Sydneykid]

I was faced with the same problem on the R33GTST when I had the 450 bhp target on pump 98, the rediculous cost of straight swap injectors made me search for another answer. The best solutiion I could come up with was a GReddy copy inlet manifold, a set of GTR top feed injectors and a GTR fuel rail with a Nismo adjustable fuel pressure regulator to push the injectors the fraction more necessary (440 to 450 bhp). Since I already had a set of standard GTR injectors and a fuel rail, the only cost was $400 for the manifold and FPR plus making up a resistor pack was no big deal for me.

That's not actually what the car has, due to the availability of E85 I decided the GTR injectors weren't going to be big enough, so I used 550 cc injectors (13B turbo) which are high impedance so I didn't need to use the resistor pack. Waste not want not, I used the resistor pack on the R32GTST with its 1000 cc Rochester injectors as they are low impedance.

Cheers

Gary

[R32 Driver]

On the topic of Injectors

How are those 1000cc Rochester and 855 Bosch injectors you see on ebay for cheap?

my understanding is they need a 14mm fuel rail and connectors? (on GTR so same low impendance)

they seem alot cheaper then sard/greddy/hks etc

[R31Nismoid]

Ye thats beccause as you said, they dont bolt in.

probably also need new injector plugs and so on, which end of the day cost vs effort vs time... the jap direct replacement stuff probably comes close, certainly wins in the speed stakes which on workshop rates can save you money

[Tangles]

I just bought 8x S15 Injectors for $500del. ebay; jps_trading_ltd

grab 4 off ebay for yourself and pm me for the 2 I dont need.

[bozodos]

So really you're better off changing to a GREDDY type intake mani, and GT-R rail + injectors rather than just using drop in replacements for the RB25DET pricewise? I'm finding that the stock ones seem to be hitting awfully close to full cycle sometimes (had a light come up on the display once to indicate max duty when setting up EBC with continued 18psi runs), and are now looking at replacing the injectors rather than be dodgy and use a FPR.

[Stargate]

Just to clarify, the RB26 and RB25 fuel rails all bolt up to the GReddy RB25 intake manifold. The difference is the injectors / FPR. I need to clarify as im doing a 25/30 using a greddy manifold and just need to open up my options for fuel rail, injectors and fpr.

Many thanks.

Edited June 10, 2009 by Stargate

[R32 Driver]

Yes the stock rb25 fuel rail will bolt onto the rb25 Greddy manifold

aftermarket rb26 fuel rails also bolt up to the greddy manifold

im sure the stock one does too, but changing from hi impendence injectors to low you need the 26 resistor pack?

aftermarket rails also come in different sizes

most common being 10.5 and 11mm

Edited June 12, 2009 by R32 Driver

[CEF11E]

I am in the process of testing 13 different types of JECS injectors (dont ask me where i got them from) i work in the automotive industry. these are all side feed and are the right impeadence for r32 and r33 gtst ecu's

they bolt right into the rail of an rb25 and even fit the plugs. once finished I should have availability of 440, 600 and 790cc injectors based on a fuel pressure of 42psi.

the problem with this is I have had to BUILD my own flow testing bench and calibrate it against another machine. this is due to most commercial machines do not have toe ability to test 6 800cc side feed injectors. I went a bit overboard and buit a bit of a monster and in the end spent more than a commercial machine costs building it but it is one hell of a machine.

once this is all done I am hoping to have sets of injectors available for less than $400 perhaps even $300 if i can get all the parts needed for the right price. I was sick of paying stupid amounts for aftermarket products that are O.E. hopefully I will be able to recoup some of the cost by selling a few sets.

I still need to do a bit more testing before i am happy to sell them to people but so far I have a factory idle with bolt in 790cc injectors and excellent atomisation. they will flow enough for 450rwkw safely. that should be enough for almost anyone.

[bubba]

I am in the process of testing 13 different types of JECS injectors (dont ask me where i got them from) i work in the automotive industry. these are all side feed and are the right impeadence for r32 and r33 gtst ecu's

they bolt right into the rail of an rb25 and even fit the plugs. once finished I should have availability of 440, 600 and 790cc injectors based on a fuel pressure of 42psi.

the problem with this is I have had to BUILD my own flow testing bench and calibrate it against another machine. this is due to most commercial machines do not have toe ability to test 6 800cc side feed injectors. I went a bit overboard and buit a bit of a monster and in the end spent more than a commercial machine costs building it but it is one hell of a machine.

once this is all done I am hoping to have sets of injectors available for less than $400 perhaps even $300 if i can get all the parts needed for the right price. I was sick of paying stupid amounts for aftermarket products that are O.E. hopefully I will be able to recoup some of the cost by selling a few sets.

I still need to do a bit more testing before i am happy to sell them to people but so far I have a factory idle with bolt in 790cc injectors and excellent atomisation. they will flow enough for 450rwkw safely. that should be enough for almost anyone.

any chance of something that would fit Neo rails?