Jump to content
SAU Community

Recommended Posts

hey guys just wondering i was thinking of using 6 S15 480cc injectors but not sure where there power limit will be can anyone shed some light for me i dont know much about injector calculating, and i have been told running massive injectors is bad for fuel comsuption etc

Power looking at 250+ hoping for 280 not sure what it will make just dont want to run out of fuel :thumbsup:

Thanks

Link to comment
https://www.sau.com.au/forums/topic/328430-injector-size-for-300kw/
Share on other sites

You can generally get 280kw with GTR injectors (6x 444cc) without sweating (without using an FPR), so I don't see any problem getting 300kw from those 480cc injectors, there is always the option of a FPR down the track to squeeze the extra 15-20w out of those S15 injectors (but generally not recommended as the extra pressure affects the spray pattern)

I thought s15 injectors were really only 440cc, except in an s15, as they run higher rail pressures? What ecu are you using?

They're actually 450cc at standard fuel pressure, 480cc is rated at a different fuel pressure as stated on that graph, cbf finding it.

Well of course you do - it's your car. However factually what you have posted is simply not possible with just 510cc injectors. Something is up.

You are either leaving something out:

Happy dyno or higher than factory fuel pressure configuration. Which one is it?

This is usually around 85% duty (give or take) in the factory fuel pressure.

510cc = 510hp

380kw = 310rwkw (or so)... at 85% duty.

360rwkw @ 100% duty

Given as a number of people have stated 440cc injectors max out ~300-310rwkw

440cc = 440hp.

330kw or 260rwkw @ 85%

300rwkw @ 100% which is exactly the max point for standard fuel pressures as already stated (surprise!)

Disagree all you want, 510cc injectors simply cannot be flowing 400hp @ 45% duty. They can only supply 510hp @ 85%

There is more than enough information/results/posts in the pages of this forum, and all across various injector suppliers to back this up, including the 3 people that already so far disagree and no doubt there will be more if this thread keeps going.

EG: If you would make your claim with 510's @ 45% duty, that would mean not one RB26 owner would ever have needed to upgrade factory injectors for 300-320rwkw.

Fact is every single RB26 owner has had to do so... Proof is in the pudding.

(given your claim would mean 440c injectors flowing 320rwkw without being maxed out, an impossibility @ factory pressures).

  • 2 weeks later...

It's fairly simple. Don't get the size that's just big enough for your power level, because once you are there, you'll want more. Guaranteed.

Go at least 740cc so you can run 50/50 ethanol or E85 (if it ever gets consistent out of the bowser).

If you tune it right there's no harm in running bigger injectors, very little cost difference, and way more headroom for more power down the track.

Do it once, do it right. :P

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • I've heard the Tomei USA head gaskets are decent if you want to o-ring the heads but otherwise not recommended.
    • The 296mm rotors are the R33 turbo brakes. The 310mm rotors are the R34 turbo brakes. The calipers are nearly the same, but not. They're the same caliper but the R34 caliper has longer legs so that it sits out far enough to go over the rotor. The pads are the same for both. When you say, "I bough tsome EBC"....did you just mean pads? Or rotors? 310mm rotors fit under 17" wheels. There may be some wheels without enough clearance though. I can't fit my fingers between the barrel of my wheel and the "corners" of my R34 calipers, but there is plenty of room behind the spokes. This is on Enkei RPF1. You can fit 324mm rotors inside a 17" wheel, but I'd be willing to bet that it would be close to impossible with the Nissan/Sumitomo caliper (using an adapter, of course), because the Sumitomo caliper is fatter than the Brembo caliper that is supposed to go on the 324mm rotors.
    • Hi. Can someone tell me what brakes(and mainly WHERE) can i buy brakes on R34 GTT? I bought some EBC which SHOULD go on my car(i have GT but it has GTT brakes) but it does not fit, Brakes are "too" small(296mm) Are 310mm be good or? I have 17 inch wheel so no "big boys" but for me driving i just need one that fits and i can get here in EU/Czech.
    • Since winter isn't that harsh anymore in Poland, i will definetely drive it 365 days a year 😉. But if the snow hits i will try it for sure and let U know. Only swap i am planning to do is of course R34 GTR front 😍.
    • Hey. Very valuable information about pitwork, I will pay attention when buying any consumable parts 🙏 As for the carpets - I got a handful of information from nengun, from which it appears that indeed the carpets for the driver's side are OEM. They are not able to show me any pictures due to the long chain of different sales entities but after I place the order, as soon as the goods arrive at the nengun warehouse from which they will send the shipment to me they can send me photos and if my purchase differs from OEM I can immediately return it / cancel the purchase. I think I will give it a try 😉. Of course i'll let you know what's what as soon as i get them P.s. I know the topic is not relevant to the thread, but both nengun and amayama have these SICK 😍 trunk room lamps available. Do you know anyone who ordered them? I need to have one in my car
×
×
  • Create New...