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Injector Question

cmoney

By cmoney,
in Engines & Forced Induction

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cmoney Proficient

cmoney

Posted
Posted

Hi guys & girls

Silly question, as im 99% sure i already know the answer....i just wanna be 100% sure before i get some injectors.

The GTR injectors are a direct replacement for RB20 injectors correct?? Im only looking at possibly an R33 S2 or Z32 turbo as a direct replacement & only 14psi or so for high boost, so a mild upgrade. GTR injectors should be ample for this, its just a bit of an added safety thing as i think the stockers i have arent quite the items they used to be. I know RB25 injectors are side feed, so basically i just wanna double check if the RB20 & RB26 top feed injectors are basically identical?? (apart from size & flow obviously)

Cheers

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Rekin Grand Master

Rekin

Posted
Posted

GTR injectors are direct replacement for RB20.

The only difference is you will need to wire in a resistor pack for the gtr injectors.

r33 turbo on a rb20 with tune should get you around 180-200kw atw.

The standard rb20 injectors max out at around 210kw atw.

So you could get away without getting gtr injectors but you will be sitting close to the limit..

Physical differences for GTR injectors are they have a yellow plastic top whereas the rb20 ones are red.

Also the connector for the power has a different notch (you will just need to file a bit of the connector on your loom for it to fit. It will make sense once you start connecting them up.

cmoney Proficient

cmoney

Posted
  • Author
Posted

Cheers for the informative reply.

Only question, the resistor pack you mention....is that an item that comes standard on a gtr that i could pick up from the jap wreckers or something??

The rest is about what i thought the differences were....thanks again.

Douse Collaborator

Douse

Posted
Posted

Resistor pack was a pain to get. I ended up getting one directly from Nissan, cause the wreckers were charging about as much (if they even knew what you were talking about)

Can't remember exactly but I THINK it was about $200 or something.....maybe less....

I will get a pic of it tonight if you like and post it up. Was fun wiring it up :P

http://www.skylinesaustralia.com/forums/Gt...det-t62674.html

barnoon Experienced

barnoon

Posted
Posted
Cheers for the informative reply.

Only question, the resistor pack you mention....is that an item that comes standard on a gtr that i could pick up from the jap wreckers or something??

The rest is about what i thought the differences were....thanks again.

Hey Chris,

yep the resistor pack does come standard on the GTR.

You can get it from here for $210 http://justjap.com/store/product.php?produ...at=0&page=1

I have one in my car from memory CRD charged me around $100 - $150 to wire it in.

Cjmartz2k Proficient

Cjmartz2k

Posted
Posted

I don't know if you guys have Turbo VG30det'd Gloria's down there or not, but they have the resistor packs in them as well. I you can find one in the junk yard, you can clip the harness after the plug so you still have it be detatchable if you ever needed. Sounds silly, but I shine mine up every once in a while and I wish I would have got the connecting clip along with everything.

wannaslide Contributor

wannaslide

Posted
Posted

hey sorry but why your on the topic of resister pack just wanna know i have a set of sard 534cc injectors and was told that i need a resister pack for them can i use the gtr one or do i need a special one if so on the gtr one does it matter what model gtr i get them from and if i need special ones where can i get them from thanks

MBS206 Grand Master

MBS206

Posted
Posted
If you just change the injectors they will tune them selfs down in flow with the stock ecu. its better to up the fuel by pump as well

Ah no, the stock ecu will keep injecting for the same amount of time, making the car run stupidly rich...

Hence the OP would also be looking at an aftermarket ECU.

STATUS Grand Master

STATUS

Posted
Posted (edited)

you need the GTR plugs also, did a set today the rb20 plugs dont fit the gtr injectors (RB20 has offset pin whereas the GTR has central and internal locating pins). Fitting GTR resistor is a piece of piss to fit. If your lazy fit 6 x 10watt (6.8ohm) resistors inline to each injector.

post-34927-1233223981_thumb.jpg

post-34927-1233224037_thumb.jpg

Edited by URAS
Rekin Grand Master

Rekin

Posted
Posted
you need the GTR plugs also, did a set today the rb20 plugs dont fit the gtr injectors (RB20 has offset pin whereas the GTR has central and internal locating pins). Fitting GTR resistor is a piece of piss to fit. If your lazy fit 6 x 10watt (6.8ohm) resistors inline to each injector.

When Abu fit them on his r32, all he did was shave off the conflicting notch and it all fit perfectly.

Let us know how much you charge to install+wire in resistor pack.

cheers

cmoney Proficient

cmoney

Posted
  • Author
Posted

Cheers for the replies guys. I was tossing up whether to just buy some new replacement items for the RB20 which now sounds like a safer bet. The gtr injectors would have been 2nd hand anyway, so might as well just do it properly from the start.

The fuel pump is already a 500hp unit, as the stock pump turned out to be in bad shape when i got the car fixed & tuned a while back, so no need to worry about that.

STATUS Grand Master

STATUS

Posted
Posted
When Abu fit them on his r32, all he did was shave off the conflicting notch and it all fit perfectly.

Let us know how much you charge to install+wire in resistor pack.

cheers

you have to take both notches off (takes longer than replacing plugs), and cause you need to cut the plugs off anyway i rather replace them. As for cost i dont usually do it.

The cost to buy GTR resistor + GTR injectors + fit is dearer. If you do the whole job DIY it is feasible, if not your best bet is to buy aftermarket

bubba Grand Master

bubba

Posted
Posted

Further to the aftermarket thing, if you are buying brand new then get some with the right impedence. I got my Denso 550s from Powerflow Injection I think they're called, they're over east and I just went through the catalogue, found the appropriate injectors (size, style, impedence) and they supplied them along with the appropriate plugs.

Oh, and this was the stupidest comment I've ever heard..

If you just change the injectors they will tune them selfs down in flow with the stock ecu. its better to up the fuel by pump as well
Rekin Grand Master

Rekin

Posted
Posted
Cheers for the replies guys. I was tossing up whether to just buy some new replacement items for the RB20 which now sounds like a safer bet. The gtr injectors would have been 2nd hand anyway, so might as well just do it properly from the start.

The fuel pump is already a 500hp unit, as the stock pump turned out to be in bad shape when i got the car fixed & tuned a while back, so no need to worry about that.

dude gtr injectors for the rb20 is the best option. Dont waste silly amount of money on aftermarket injectors.

You just get the injectors cleaned and they will be good as new (cost about $200 for 6 injectors to be cleaned and new orings etc)

you have to take both notches off (takes longer than replacing plugs), and cause you need to cut the plugs off anyway i rather replace them. As for cost i dont usually do it.

The cost to buy GTR resistor + GTR injectors + fit is dearer. If you do the whole job DIY it is feasible, if not your best bet is to buy aftermarket

hmm thanks for the info.

So the gtr injector plugs are on the gtr loom im assuming? Got a set of cleaned gtr injectors + gtr resistor pack sitting next to me. No motivation to them in haha

Let us know if you will be interested installing them, looking around for quotes atm.

Where did you find the plugs and how much do they roughly cost?

Thanks

Guest 40th-edition

Guest 40th-edition

Posted
Posted
Ah no, the stock ecu will keep injecting for the same amount of time, making the car run stupidly rich...

Hence the OP would also be looking at an aftermarket ECU.

NO, it will tune down using your O2 sensor as a guide and the ecu will tune down till its fuel air ratio is 14.7:1 again

Adriano Grand Master

Adriano

Posted
Posted

^^^^Yeah good luck with that. No hope, you are fitting injectors that are a lot bigger, there is no self learning on th estock ecu. In closed loop it will try to lean it out, but nowhere near enough to get to 14.7:1. O2 feedback is only a trim, of 5% or so.

bubba Grand Master

bubba

Posted
Posted
NO, it will tune down using your O2 sensor as a guide and the ecu will tune down till its fuel air ratio is 14.7:1 again

Erno. The O2 sensor is only utilised for closed loop operation at idle and light cruise.

Bigger injectors absolutely require a retune.

well he has the pump and if you fit inject 2 then may as well get the powe fc to tune it right so you dont do damage to engine or use to much fuel

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