How Much Boost Will Stock Injecters Handle

[tezflow]

hi guys,

i have a r33 gtst and it has a cooler,pod,turbo back zorst, fuel pump, hiflow turbo and a power fc.... i was just wondering how much boost i can run before the injecters start cutting out...thanks guys.

[Strik3r]

15-16 PSI i would guess.. 220-230rwkw is all they are good for.make sure you keep the injector duty cycle below 90 or you might end up paying for more than just new injectors.

[paulr33]

boost is relevant to turbine compressor

on the stock turbo you can run 78psi on stock injectors and you will be fine, wont run out of flow

[sinistaGTR]

lol dont do that, though it would be hilarious....a better question either would have been....how much boost can i run with 'x' mods, or whats the highest kw the stock injectors can take. your next upgrade is afm and injectors

[Pauly33GTS-t]

I think he meant 7 to 8 my friend but yes 78 psi would be fun to watch.

[paulr33]

no i meant 78psi

i say this because PSI is pointless in comparison for this sort of thing. it means absolutely nothing.

PSI is only relevative to the compressor you are using. if he tried to run 14psi on a GT40 then the stock injectors have no hope.

if he tried 14psi on the stock turbocharger then its fine. so 78psi on the stock turbo is probably fine for stock injectors.

it wont flow any useful air past 12psi anyway so the other 66psi is just extra heat and nothing more.

[Pauly33GTS-t]

so paulr33... im running 10psi on a GT30R on stock injectors. safe?

[paulr33]

so paulr33... im running 10psi on a GT30R on stock injectors. safe?

depends on the compressor model you are using

the compressor map would give you the true answer to this

but a 30R will flow quiet a lot of air even at 10psi

so you might be on the border line, a dyno plot will give you the answer if you cant find the compressor map info or dont care about the map and reading it

[Pauly33GTS-t]

im running a GT3076R with a RB25 turbo's highflowed exhaust side.

84 trim, 0.82 a/r. (i think they the numbers from turbobygarrett.com)

Edited April 23, 2007 by Pauly33GTS-t

[Pauly33GTS-t]

any idea pauly?

[paulr33]

list your full mods please

[InterCooL]

...the correct question is "how much power will stock injectors handle"

jump on some websites of injector makers. they have a calculation applet thing that allows you to put in all your factors and it will rate the injectors for power. rc engineering comes to mind

IF the stock injectors run to 220rwkw as mentioned before, then you can have a t66 turbo on your car, just cap the boost to that power.

[Pauly33GTS-t]

mods are in RED in my siggy pauly.

my gt3076R is a GT30R compressor wheel inside a fully highflowed (max) Rb25 compressor housing.

[paulr33]

get a nismo fuel reg

i would consider changing the pump or hard wire it to 14v (cubes did a howto guide), the wallbro's can be known baddies

what ecu or piggyback are u running? i see no mention of either.

i would suggest stand alone. powerfc is ideal, but pick whatever you like.

either way monitor injector duty and go from there.

stock ecu on those upgrades = bad idea and poor net results

the car will drive like brand new with a complete tune

[sl33py]

My local tuner has a few Skylines running around town with 300rwkw with an upgraded fuel pump, rising rate fuel regulator and stock injectors (new turbos and other supporting mods too)... he says when I go to upgrade, I can get 250-260rwkw on a "really safe" tune with a similar setup, but he said the 300 ones aren't running dangerously or anything. This is a tuner that's had several cars feature in HPI (but I don't know how much credibility that magazine gets on here). Because of threads like this, I've been wary, and asked him several times about upgrading the injectors as part of my upgrade plans, and every time he says it isn't needed for my aims (even when I say money isn't a factor in the decision).

[Pauly33GTS-t]

paul mate, im running on stock ecu and over the last shit it already seems like a new car...

Im getting hissing and clicking from the injectors tho, me thinks the o-rings have gone on them.

I'll be going Emanage ultimate it seems, as soon as I know for certain someone in adelaide tunes them well.

[paulr33]

ask 10 local tuners what ecus they tune

and go from there

dont buy an emanage if there is only 1 local tuner

[mikel]

I would have thought the only real test was an AFR on the dyno?

Any specs on a website will be a guide only.

depending on mods the factory injectors may be fine if they can support a safe AFR at full boost.

Mike

[sinistaGTR]

Ecu is the biggest thing needed........inj also will help, and afm

[mickr33]

260kw on stock injectors with all other supporting mods using slide hi-flow running 17 psi. Also the use of a nismo fuel pressure reg helped.