Ultimate chip(stk inj)???need more fuel

[GM tech]

I have a Ultimate chip w/stock injectors and I am not getting enough fuel.Pushing up fuel pressure helps on top but runs like crap otherwise.50# static is good for driving around,but runs out of fuel under load.
My question is,can I up injector size to something like a 42# without having problems???

 

[jwaller]

Re: Ultimate chip(stk inj)???need more fuel

go straight to 50's unless you want to do your own custom chip work. everybody has 50# programs. dont know anybody that has 42's.

 

[ty166]

Re: Ultimate chip(stk inj)???need more fuel

i looking to get a ultimate for stock inj. , if your gonna upgrade let me know maybe we can work something out.

 

[Don W.]

Re: Ultimate chip(stk inj)???need more fuel

Always trying to learn so just curious how you know it's "not getting enough fuel."

 

[GM tech]

Re: Ultimate chip(stk inj)???need more fuel

I'd like to sneak them in with the chip I have.
I now it's lean because I ran up fuel pressure and my top end power got better,then I had a friend check it with his A/F ratio meter.
What size are the stock injectors????(30#ish)

 

[MYYellowTY]

Re: Ultimate chip(stk inj)???need more fuel

Im in the same boat.Have a Ultimate and stock injectors(I think 30# or 32#) are not enough.However I dont have the money to switch to a 50# chip upgrade and injectors.So I actually put in 42.5# injectors.I was idling a bit off and the Check Engine light was coming on and giving a code 42 (egr to rich),so I backed the AFPR all the way down as far as possible.
Still got the CE light occasionally.Then I threw a K&N filter on the stock cross over pipe and it hasnt been on since.Wasnt getting enough air I guess.I havent had time to do a DM run yet.Plus Im getting my WB soon so I can try adj it.I would get 38# if anything.So you wont have to back out the reg. and would be able to adjust with it.Mine is running very strong now and idles fine.It is possible, but if you can get 50#s do it.

 

[mandingo]

Re: Ultimate chip(stk inj)???need more fuel

What is the hightest fuel pressure setting you have tried, 50#?
I have my fp at 60#s, runs better under load then when i had it at 50#

 

[dgoodhue]

Re: Ultimate chip(stk inj)???need more fuel

What mods do you have, that your running out of injector?