Need More Power

[OVADRV]

please stay on topic,i just to want to know can i get more power with bigger injectors ???

Car: R33 gtst 1994

MODS: apexi pfc

nismo fuel reg

slide performance highflow turbo stage 3

hiflo exhaust 3inch-split dump

bosch fuel pump internal

z32 afm

garret wastegate acuator new

15 psi

tuned 230rwkw

[Devils_Advocate21]

Well with bigger injectors say 555 nismos you'll be able to screw the reg back to stock without having high pressure to compensate the stockies you have on there probably an overall better tune which may give you a little more power but pretty much near the peak of highflows, maybe 1 or 2 more psi plus what bosch pump u got??? And you wouldnt have a dyno sheet to post up would you??

Cheers

[OVADRV]

yeah i spose your right pretty much near peak i think the turbo is rated to 260-270 rkw

i will post up the dyno sheet soon.

[OVADRV]

bosch pump 040

Edited January 8, 2008 by OVADRV

[GeeTR]

Injectors don't make power, they supplement it. Use your PFC and check what inj duty your running at that max power. If its close to 100% then that would have stopped the tuner from winding more boost in.

Talk to the tuner who plugged the numbers in.

[mickr33]

Hey OVADRV. I'm running the slide max oversize with the VG30 rear housing and was making 260 at the rear's on stock injectors which were running at around 92-95% duty cycle with a fuel reg. I have replaced the injectors with Nismo 550's mainly so it would be more safe, but at the same time i was hoping for maybe a little more power. It was running 17psi and i told the tunner to go up to 19psi if it pushed out more power. He tried but the little hi-flow just wouldn't do it. I was told it actually went backwards in performance when he bumped it up more. Having said that he meant not to just gain a higher kw reading but the overall power curve. Hope this helps. BTW the duty cycle is now around the 60-65% mark at this power.

Edited January 8, 2008 by mickr33

[eddieeeee-ro]

i got 6 X 440cc injectors for sale, they came from manual s15

these will support 260rwkw @ 80ish% duty.

pm me your interested. they'll drop straight into your rb25.

no need to spend $800 on a set of nismos.

[r33cruiser]

math alert!!!!

e.g.; cc x 6/5 = hp (700cc x 6/5 = 840hp)

\

so nismo 550x6/5= 660hp

[OVADRV]

1. GEETR yes tuner did stop the injector duty at 60-70% because the boost would drop off in higher revs so he tuned it to that.he could not find the problem,i was happy with it anyway and left it at that.i found months later that the intake hose was sucking close causing boost drop excessivly.i fixed that but yet to be tuned. cant wait to get it back on the dyno .

2.mickr33 thanks for the info looks like i might just squeeze just a little bit more once i get it tuned.

[GeeTR]

Keep in mind 80% duty is considered max safe, to prevent a lean out if for what ever reason, the car over boosts.

That said, many ppl run on the edge

Edited January 8, 2008 by GeeTR