nitenshinarmor

Presently, with my mods, (heads, c2 cam, ls6 intake, headers, no cats or muffler, elect.water pump and tuned) my car is 412 rwhp na. With these mods, my injectors run at ~92% duty cycle naturally aspirated. In addition, I have a 100 wet shot to go on top of all this. What advantages do I have in changing out to bigger injectors. I know (or I least I think) this shouldn't give me any more hp gains. But what kind of advantages would I gain, if any. In addition, I plan on re-jetting the nitrous to 150 wet shot.

nitenshinarmor

Anybody????????

DrkPhx

iTrader: (15)

If you're at 92% Inj Duty Cycle now, then for sure they will go static (open all the time) with a 100 shot of nitrous because the fuel system cannot provide adequate fuel at WOT resulting in a lean condition and possible engine damage. There are no hp gains when upgrading to a bigger injector, just better control of fuel delivery.

BuBbABFP

iTrader: (3)

+1

nitenshinarmor

I don't really understand what you are saying here. How does a "wet shot" of nitrous have anything to do with the injectors going static? I run a Racetronix fuel pump with the hot wire kit. Are you saying I would go lean with factory 26 lb injectors (412 rwhp na) when I shoot a 100 shot of wet nitrous because my racetronix fuel pump cannot keep up?

stevegrizzle

are you running a fpss? That should be all you need for now, but you know you are going to want more power and you want your injdc to be below 85% at all times, ideally.

xXSilencerXx

iTrader: (4)

Well if you are at 92% that makes sense.

stevegrizzle

no it doesn't, if the pressure is the same at the fuel rail and its a wet kit the car does "know" the difference. unless he's spraying his wet kit thru the maf...now if its a dry kit then the injector have to supply the extra fuel that the maf is telling it to.

ThirdGenLS1

iTrader: (11)

either way he should upgrade his injectors to at least svo 30's. anything over 400 is just to much for stock injectors.

nddragon01

I'm at 400rwhp and still running the stock injectors, with no problems at all. Duty cycle is around 10-12% for normal daily driving. I'll have to get back to you on what it's at when racing down the track (typically I'm looking out the windshield and not at the duty cycle monitor...)

ThirdGenLS1

iTrader: (11)

haha well of course it wouldnt go up very much during normal driving. But anways there are lots of people that do it but doesnt mean you should. Yes somtimes you can get by, but that doesnt mean you should do it. No matter what anyone says you should always upgrade. Theres a lot of so called "professional tuners" that will tell you different. all i can say about them is run away, or my favorite is when they say you can run a 30 lb. injector on a 500 whp engine wont names any names....cough...cough....ryne...cough CMS...cough

ZL1Killa

iTrader: (17)

just grab you some new injectors , whether it be 32#, 37# or even 42#

i have the 42# racetronix and had no problems tuning nor anything else

ThirdGenLS1

iTrader: (11)

yea i would say just go with some 42's they will idle just fine. And you'll have plenty of room if you upgrade or decide to go with a dry shot

stevegrizzle

Yes I have been told that above 85% the injectors just stay open and it isnt really tunable. I would make the investment if I were you. For my application I am only putting down 350's on the motor so the injdc is much lower.....

tim99ws6

iTrader: (31)

That's interesting. I ran 28.8 stockers on a 460rwhp pull. Yes, they were beyond limit, but i still had a clean a/f run. I upgraded to SVO 30's, and they are working just fine. I don't know who the hell CMS is, but i know my setup is...hanging in there...

I will say i am on the look out for 42s, but i dont think im too un-safe to go racing without them. Anyone who says you can't tune a 28.8 setup to make 460, i would be happy to show them my A/f and dyno graph.....if i can find it, haha

ThirdGenLS1

iTrader: (11)

oh i'm not saying it can't be done, obvously it can people have done it. But its like running a large cam with no headers. It will run but not exactlly something you want to do.

nddragon01

Ha ha, I know I know I know...everything will be fine for normal driving, just using it as a base point since it's when I feel safest for looking away. I'll floor it a few times at WOT on the highway over the weekend while travelling for the holiday and see what happens. Though I'm sure if something was wrong with the injectors (needed to be upgraded, not sufficient for my setup, etc.), the guys at Eastside Performance would have told me so when they tuned my car. 12:1 AFR across the entire powerband seems pretty good to me...

BenLaz

iTrader: (6)

it can be done but definetly not safely... i had a nice A/F curve while making 420rwhp on my 26.6's until i did a datalog later on and had a max injector duty cycle of 145%... now with the 42#'s in, max is 62%.

02 BLK WS6

iTrader: (11)

I am running a Racetronix fuel pump with hotwire, FAST 36# inj. and on a 200 DRY shot with 11.0:1 AFR my injectors are 96% DC. It's time for a 100 dry to get the car moving, and a 150 wet in combination on a window switch.

The lab experiment is.......... how much longer will the stock 129,000 mile bottom end last. About the time that the 2nd stage goes on, there will be a set of ported heads added as well.

KENS WS6

just did a pull on my car made460hp 103% cycle Im going to 42s and a new fuel pump.,becucase im going to hit 150 dry shot.hello to 10s.