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What Injectors Are You Using On Your Rb20det

allthewaytotheskyline
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bubba Grand Master

bubba

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I was aiming a bit higher than 200rwkw..

Am running Denso 550cc's, came with matching plugs that needed soldering to the loom and also needed a couple of copper washers to chock the injectors up so they didn't pop out of the manifold.

Wheezy Mentor

Wheezy

Posted
Posted
I was aiming a bit higher than 200rwkw..

Am running Denso 550cc's, came with matching plugs that needed soldering to the loom and also needed a couple of copper washers to chock the injectors up so they didn't pop out of the manifold.

Ive got the same injectors.

Question Bubba: why did you use the washers? Theres no where for the injectors to go, unless you change your fuel rail????

bubba Grand Master

bubba

Posted
Posted
Ive got the same injectors.

Question Bubba: why did you use the washers? Theres no where for the injectors to go, unless you change your fuel rail????

My tuner said it's a common problem with the older Denso made injectors (SARD etc), used ~2mm of copper washers around the neck of the injector (I think the rail end but i'll check when it's not nearly 40deg outside :/). Basically the injectors kept popping out of the manifold slightly when it came on boost (ergo leaking fuel), the washers just take up the slack and hold the injectors tight into the manifold. I guess this means they're a couple of mm too short..

Wheezy Mentor

Wheezy

Posted
Posted
My tuner said it's a common problem with the older Denso made injectors (SARD etc), used ~2mm of copper washers around the neck of the injector (I think the rail end but i'll check when it's not nearly 40deg outside :P). Basically the injectors kept popping out of the manifold slightly when it came on boost (ergo leaking fuel), the washers just take up the slack and hold the injectors tight into the manifold. I guess this means they're a couple of mm too short..

Cheers bloke. Ill keep an eye out on them and put some washers in if need be. What material did you use, just copper washers?

limpus Mentor

limpus

Posted
Posted

Common upgrade would be GTR 440cc injectors...the will fit with abit of trimming on the connector and you will need a resistor pack from a GTR too...they would support numbers around the 250-270kw range comfotably...maybe abit more...

bubba Grand Master

bubba

Posted
Posted

Wheezy: just copper washers from the box of assorted copper washers :cool:

limpus: I didn't want to screw around with resistors or ballast pack so bought brand now high impedance items.

alltheway: yes you DEFINATELY need a tune if changing injectors. I'm running my RB30 with 550cc injectors and z32 afm on a remapped rb20 ecu.

AD4M Proficient

AD4M

Posted
Posted
Common upgrade would be GTR 440cc injectors...the will fit with abit of trimming on the connector and you will need a resistor pack from a GTR too...they would support numbers around the 250-270kw range comfotably...maybe abit more...

Ive made just over 300rwkw using 440cc gtr injectors on my 20, they clip straight into the original harness and rail, and as its been said if your using the std 32 computer you'll need to get a resistor pack wired into the injector harness

limpus Mentor

limpus

Posted
Posted (edited)
Ive made just over 300rwkw using 440cc gtr injectors on my 20, they clip straight into the original harness and rail, and as its been said if your using the std 32 computer you'll need to get a resistor pack wired into the injector harness

Nice numbers...i only said 250-270kw as a rough guide but its good to see they can be pushed so far...are you sure they clip straight on though? because i had to trim the keyways off the injector to get the connectors on...i believe many others here have done it too...resistor pack was needed as well....

Edited by limpus
Ceffy_SA Collaborator

Ceffy_SA

Posted
Posted

I would have thought std Rb20 injectors would do the job, im currently making 215RWKW (not that it means a great deal as all dynos are different) but many people have made 200RWKW and over with std injectors without maxing them out

allthewaytotheskyline Mentor

allthewaytotheskyline

Posted
  • Author
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I would have thought std Rb20 injectors would do the job, im currently making 215RWKW (not that it means a great deal as all dynos are different) but many people have made 200RWKW and over with std injectors without maxing them out

are you sure...my dyno guy told me my injectors will max out at bout 170rwkw

AD4M Proficient

AD4M

Posted
Posted
Nice numbers...i only said 250-270kw as a rough guide but its good to see they can be pushed so far...are you sure they clip straight on though? because i had to trim the keyways off the injector to get the connectors on...i believe many others here have done it too...resistor pack was needed as well....

actually i could be wrong about the clips, my car came with them already installed, but trimming the keyway is no biggie :banana:

RaZ_TuRbO Community Regular

RaZ_TuRbO

Posted
Posted

Can anyone confirm you dont need a resistor pack if you have a safc, just by turning the settings into the minus lowers the ohms reading therefore running gtr injectors without resistor pack.

Confirmation?

FOG35 Collaborator

FOG35

Posted
Posted

Pretty sure you still need the resistor pack if you have a safc.

If you are only chasing 200rwkw then i'd stick with the standard injectors and maybe bolt on a nismo fpr.

My Rb20 made 202rwkw with standard injectors on 16psi. But then again dyno's are different.

paulR32gtr Mentor

paulR32gtr

Posted
Posted

raZ1911 - yes a bad thing.

The computer will be firing the injectors at the same pulse width for all the injectors, so two larger injectors are going to let more fuel through in the same amount of time.

If there were such an ECU that could control individual injector pulse width - (MOTEC maybe?) tuning the thing would be a nightmare - you would want to be monitoring Air/Fuel ratios out of each individual cylinder to ensure everything was good.

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