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Injectors + Rail To Use?

adamsrotor

By adamsrotor,
in Engines & Forced Induction

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adamsrotor Enthusiast

adamsrotor

Posted
Posted

hey guys, im currently building my 25/26 and am using a greddy manifold and would like to convert from sidefeed to topfeed. im aiming for around the 500rwhp and will be using a hks rail, i noticed there is a 10.5mm (std) and a 11mm (oversize). is there really much diff and which brands make what size injectors? also there is the injector sizing issue, i was thinking around 700/750cc? i guess this would be enough to cope and wouldnt have to go to 1000cc's? what brands are good stuff? every1 tells me diff stories, i hear the 4 hole nismos are really good, then i know sard make good gear but ive heard dont use sard injectors :) any help on this would be apprectiated. am using a bosch 044 with surge tank and turbosmart fpr 800reg. thanks.

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JimX Grand Master

JimX

Posted
Posted

I am using the Sard 700cc injectors with 2x2530 turbos and they get up to around 80% duty cycle at full throttle and 20 psi boost. I haven't dyno'd the car yet (only road tune) but it'd be well under 500rwhp. I would think that you'd need to go larger for 500rwhp, but I am also running standard AFM's which max out, and I think once that happens the ECU will start dumping in more fuel than it needs just to be safe. So maybe my 80% duty cycle is more than it should be. Also I'm running the standard fuel reg, you can squeeze more fuel out of them with your turbosmart reg but I don't know if it'd be enough.

Speak to your tuner who would have a better idea about sizes and brands and how much extra flow your reg will get you. I have an adjustable Nismo reg but haven't installed it because I don't need it yet. I really like these Sards though, they're smoother than I expected and idle very nicely even when cold (when the ECU is behaving, it stumbles 2-3 times when aircon kicks in but it did that on the factory injectors too, need to re-program the PowerFC's idle soon). I couldn't tell these aren't factory injectors, and bigger injectors are meant to be a bit rough at idle/cruising.

I'm not familiar with the HKS rail, I'm using the factory rail (RB26) for these injectors if that helps at all.

GTRsean Grand Master

GTRsean

Posted
Posted (edited)

700cc sards and stock fuel rail too. It's all in the tune. :/

Fuel pump setup will be a decider too in how much HP.

I was running 470RWHP at 17psi with 2530's and a sard 280L pump.

Injectors still had room left for more (500+).

Edited by GTRsean
WHITER33GTS-T Veteran

WHITER33GTS-T

Posted
Posted

Just go big straight up then when you want more power, as you will, then you have the fuel system ready.

I have 1000cc injectors, twin entry fuel rail, 2 x 044 pumps and a GTR pump filling the surge tank. This fuel system was on my old RB25 that made 399rwkw. It still has plenty for my new setup 25/30

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