Injector Size Question For Rb30Det.

[nicksamaniac]

Just after a size of injectors for my rb30det, I'm aiming for around 300hp?

My turbo only has a 0.63 rear, and it'll be tuned for low end power, I'm after bulk torque more so than outright hp, not sure if it would support much more than that power wise.

(It has a/r50 compressor, it's advertised as a 450hp)

What would everyone suggest as a good size? Not sure what else to post spec wise to help?

[Ben C34]

The spec of the engine has basically no bearing on fuel flow requirements, just pressure, fuel type and power goal.

I assume 98 as it's in a patrol and you want to be able to fill up everywhere.

300hp isn't much, so 550 would do it very easily,but they are typically the old style with not as good spray pattern.

Pm scottynm35 as he can get you xpurts for a great price.

Another option could be decent pump, and bump base pressure up, and do it with stock injectors.

I think stock at stock pressure will do 230kw at, so raise pressure would do 300hp no worries.

[Ben C34]

Actually nick for that power I would definitely use a decent pump and bump up base pressure. Heaps easier.

[zebra]

225kw = 300hp

could just do it on standard injectors and standard pressure

[nicksamaniac]

It is running a new intank pump, as it was a diesel tank with r31 pickup modified to hold a new pump and extended to reach the bottom,

1.5liter surge with some massive Bosch pump externaly.

And using r34 neo injectors and rail modified to fit the rb20 style inlet.

Yeah 95-98 Ron depends how far outa town/Bush I go!

Wanting to run 10 or more psi just didn'. Know if the 370's would do it without goin over 80-90% duty all the time.

[nicksamaniac]

Only running 7-8psi atm, and wanting to get all the mods/bits needed for tuning instead of going back after every upgrade.

if 550's Will do over 300hp then I'll just let my tuner push it a bit more.

But really only after a realistic result, I'm not expecting massive power but would be sweet to get a good result from my back yard build.

[GTSBoy]

Wanting to run 10 or more psi just didn'. Know if the 370's would do it without goin over 80-90% duty all the time.

General rule of thumb. On a 6 cylinder you can make about as many engine HP as you have cc/min on one injector. 370s won't quite reach your target 400 at the fly stock, but they will with a bit more pressure. There's nothing wrong with using 90+% duty cycle for those few seconds of each commute drive where you actually run the engine up to full power.

Once you get past that level of tweaking, rather than buying 550s or something else based on older tech injectors, you're probably better off doing the modern thing and just getting ID1000s or equivalent for not a lot of coin. Old tech or second hand injectors need to be very cheap indeed to justify choosing them over modern Bosch ones. And it doesn't matter that they aremuch too big, because they'll still idle like stock and give good fuel economy.

Edited April 27, 2014 by GTSBoy

[nicksamaniac]

I do have a set of sard/power enterprise 800cc high impedance injectors, the twin spray type, but wasn't too sure on the whole idle quality and fuel usage thing.

It currently uses 18.5l/100!

And would really like to reduce that over anything else. It does run fairly rich all the time now (on wideband)

And I've backed off the load point voltage on the afm abit which has helped.