JCurtin

iTrader: (1)

I'm going to be using a NOS 5177 kit. Whats the max I can spray on the stock injectors? Is it 120? Will buying 42lb injectors allow me to spray more right away? Will I need to upgrade the fuel pump and the injectors at the same time? And what kind of tuning is involved in swapping out the injectors? Lots of questions yes I know, just want to be ready for everything so I can install and have everything off the bat.

white2001s10

iTrader: (4)

You should be able to spray a 400 shot with 42 pounders.
Go to the PCM section for the injector change.
Get comfortable with the tuning first.

383LQ4SS

iTrader: (33)

yes 42lbders are fequently used for dry setups. You may get a lil more room by just going to the 42 lbders but it really should be accompnaied by a intank pump change as well. Those two items will alow you to get in excess of 650rwhp total to the ground. Some have used that combo with a volt blaster for 750+ rwhp.

JCurtin

iTrader: (1)

So with the 42lbs I should have no problems spraying 150 dry? I guess I should have just asked how to spray 150 dry without running lean.

red00z

Will adding the 42lb injectors to a relatively stock LS1 work okay when the car isn't running the nitrous?

NVR_ENUF

iTrader: (13)

Yes,... but you have to get the PCM adjusted for the higher fuel flow rate...

BadAssFast

iTrader: (2)

I'm running 42lb Racetronix Injectors and a Racetronix pump my Fuel Pressure reads 61 psi and doesn't vary by much. My tuner had to take that into consideration. I'd be intouch with a competent tuner for advice befroe you swap them out...good news is with the right tools is takes less than 30 min to do with a little experience.

Robert56

iTrader: (2)

42 Ford svo's will be about 48lb'ers at our pressure, and are the crowd favorite considering dry. Might as well go for it and a pump. If you have hp tuners it really isn't that hard to re scale for larger injectors, and there is step by step directions in tuning section. Svo 42's were my choice, and they are pretty cheap also.
Robert

227Hawk

iTrader: (1)

Red hard supra actually has the 42# numbers on his site. The change is working much better then trying to scale the injectors. The only thing will be the racetronix fuel pressure will be higher then the factory 58#. You can start with his numbers and
wideband from there. The best way is to wideband for A/F i know no body wants to hear that. But much cheaper then a motor.
Hawk

pushinfreight

42lb svo with 255l walbro and a boost a pump here with a constant 60-62 lbs of fuel pressure. This should support 200 dry. I also added larger fuel rail to my setup and will end up with about 200 dry on a 2 stage with the current fuel setup.

Unstang

iTrader: (26)

How about on a full bolt on car, going for 100 rwhp of spray? I don't think the 26.4s can keep up, but I want to be sure.

LoWeLL216

iTrader: (1)

There's an injector spreadsheet in the PCM section or on RedHardSupra's blog site. Just plug in your injector specs and your fuel rail pressure and it calculates the values for you.

LoWeLL216

iTrader: (1)

http://redhardsupra.blogspot.com/

Here you go.

Race Car Driver

I use 42# injectors on my motor. When I spray a 175 shot, which equates to around 500 rwhp in Denver, they only hit a max of 59% duty. You could get by with a bit less injector.

red00z

Is that bad for an injector to not be used to atleast 50% of it's capabilities during normal driving?

Race Car Driver

No, it's not.