What I have is a radix with 3.1" pulley on a lq4 with a magnaflow catback. I am wanting to do the 90mm Jtube mod and long tubes, but am not sure if that will push the 42#(assuming thats what the stock radix injectors are) over the limit. Nothing has been installed yet so I don't know what the IDC is with just the radix and catback. I've heard that you don't want to run the injectors past 85% too often correct?

 

Do you have alky? plan on it? 43lbers should be close to 500hp. My 60's run 64%

 

no alky.. for some reason I'm very hesitant, it just scares me, as well as nitrous. Maybe for a weekend truck, but this is my dd...

On a side note I seem to remember a thread about you moding your own J tube for the 90mm TB.. how much of a chore was that? maybe I can find your thread

 

my 44# injectors are at 86-87% at 5psi on a stock LQ4 with a AFR of 11.2 @ 5900 rpms if that gives you an idea.. Im wanting the 65# injectors but dont want to part with the money quite yet..

 

It was Stoichiometric who modded his stock tube.

 

Big Tex also modded his stock tube from what I remembered for the 90MM. With your truck being an 03' you can go quite a ways on the MP112 with the injectors that you have currently. Going with an agressive cam, headers, and the 90mm might get you over 100% though.

 

Yea, I've heard having the return fuel system gives me a bit more life on the injectors.

Ultimatly I want to break into the 13's in full street attire (6000lbs). The three big mods I see asside from nitrois/meth are LT's, cam, and the 90mm TB. I didn't budget enough for all three so I'm trying to see what combo is the most effective... all the while keeping good down low power A pulley change would be easy but I don't wanna heat up the air too much nor do I want to run over 7psi

 

You might want to get away from mail order tune's if that's what westers is doing for you.

 

oh i am.. My goal is to have slowhawk tune it for me in mass. The westers tune was great for a stock truck... it pulled much better, but when the truck becomes custom I think its best to get a tune in person

 

my 42's are at 84 IDC at 9 lbs 11.4 AFR upper rpm. 4.8 liter.