Is It Safe To Run 92% Duty Cycle On Stock Injectors

[R33GOD]

should i really be buying injectors with this setup?

i only want to run 15-16psi on my turbo with a slide hiflow to keep the engine running a long life but make decent power also.

ive stated my mods before but for pplz who dont know they consist of a fmic, 3in exhaust (trb back), pfc, bigger f/pump,pod filter. is it really worth getting an injector upgrade for say 230rwk and will the stock injectors be safe at say 92% duty cycle?

thanks guys

car is a r33gtst

Edited March 30, 2007 by R33GOD

[Cubes]

Grab an adj fuel pressure reg and bump fuel pressure up a few psi. 92% isn't too bad but watch those cold nights and overrev's. You may see close to 100.

[benl1981]

R33 god have you got a Z32 AFM? If not when does your AFM hit 5.1v? Around 4000rpm ?

Curious as I am about to throw on a highflow ..

Are you just speculating or is that what duty cycle you are seeing?

[R33GOD]

im just speculating at the moment mate. but my tuner will run them on 92 thats why i wanted to know. the stock afm will flow to 230 rwk so ive heard so im not worried about that. im biulding a good quality streeter not a drag car

but still not convinced about the high duty cycle he's going to run

Edited March 30, 2007 by R33GOD

[R31Nismoid]

Personally i would not.

I would push no more than 85%... even that is on the edge. This allows for suffcient headroom.

Call it over precaution, but i certainly would let a built motor let go... or want a motor to let go

[STATUS]

im just speculating at the moment mate. but my tuner will run them on 92 thats why i wanted to know. the stock afm will flow to 230 rwk so ive heard so im not worried about that. im biulding a good quality streeter not a drag car

but still not convinced about the high duty cycle he's going to run

it depends on headroom in the tune, we rans cats car all 2004 at 98% duty cycle with no dramas, it is not all that smart but it is doable. Bigger injectors a better tune will usually yeild better power as you dont need the headroom precautions.

[Robo's]

92% is fine. You will find even in cold weather it won't alter that much, maybe 93% but never near 100%. Ive ran close to 98% and constitantly monitored it. Thats living on the danger side though with one eyed glued on the PFC. I ran a 2535 turbo with a adj. fuel pressure regulator.

[R33GOD]

better to be safe then sorry i guess. only need a maximum of 440cc to get the power i want. deatschwerks are cheap but i might be risking blowin up an engine. my setup is good for a genuine 230 rwk. just confused with all these replys thats all

[sinistaGTR]

dont run 92% thats bad as nismoid said 85 is safe....... get some s15injectors there 280cc bolt straight in no mods required and there cheap

[paulr33]

no need to change

[Risking]

It depends on the tune, Ive been running a set of 555's at 95% for ages and my AFR's are a little on the rich side. I have constant lambda logging so I know its always safe.

One day ill get around to buying bigger injectors and re-tunning it but atm its happy doing what its doing.

When it comes to injector buying time I like to treat each vehicle on its own merit. Id recommend you do the same.

[drf76]

Personally i would not.

I would push no more than 85%... even that is on the edge. This allows for suffcient headroom.

Call it over precaution, but i certainly would let a built motor let go... or want a motor to let go

definitely not a good idea running them at 92% like r31Nismoid said even 85% is pushing, although many people do its not smart, can fry injector drivers, melt wiring etc which ive seen happen, 75% duty cycle is optimum but means u need even bigger injectors, if you plan of giving you car heaps for longer periods of time dont run them a 92%

[R33GOD]

definitely not a good idea running them at 92% like r31Nismoid said even 85% is pushing, although many people do its not smart, can fry injector drivers, melt wiring etc which ive seen happen, 75% duty cycle is optimum but means u need even bigger injectors, if you plan of giving you car heaps for longer periods of time dont run them a 92%

i do have a heavy foot so yea i might just save up n buy some injectors too

[IanB]

GTR injectors ftw.

@ 210 RWKW my injectors never go above 65%

[666DAN]

Just get the deatschwerks, with the trade-in on your stock ones they're a bargain...also with the cost diference just get the 550's in case you change your mind about the power level.

[R33GOD]

Just get the deatschwerks, with the trade-in on your stock ones they're a bargain...also with the cost diference just get the 550's in case you change your mind about the power level.

good point. thanks mate

[Robo's]

Ive been running in the 90% range for the last 2 years, no problems at all.

[noone]

not wanting to hijack your thread but I was told it was also bad to run to big injectors as it can make it harder to tune can anyone confirm this, as the prices seem to be the same in some brands up to 1000cc

[R31Nismoid]

Injector pricing usually only varies by $20-$30 as you go up in size.

So as an exacmple 555cc might be $100, 740cc might be $120

[Adriano]

definitely not a good idea running them at 92% like r31Nismoid said even 85% is pushing, although many people do its not smart, can fry injector drivers, melt wiring etc which ive seen happen, 75% duty cycle is optimum but means u need even bigger injectors, if you plan of giving you car heaps for longer periods of time dont run them a 92%

This would point to other problems not related to injector size or duty cycle.