Hey guys I just installed my ZZP 2.7 pulley and was wondering if its safe too run the 42.5 pound injectors from the STG1 kit with 1step colder plugs???? I am getting about 120+ KPA on the boost gauge.... How much are the 60 pound injectors and will they work with the stage 1 GM kit?

 

One of the moderators Denny has a 2.6" pulley with 42# fuel injectors. He is fine. So there you go.

 

But, he's limiting boost with a boost controller.

 

Well I am only hitting just over 120kpa??? Which is how much psi?? Mabe 17psi...How much power is the 42.5 STG1/Stg2 injectors able too handle??? Vs say 60pounders..???

 

If you don't get an answer soon, I will post up Sunday night, and i will let you know what the duty cyle is on the 42.5 with a 2.7....going to do some logging with HPTuners this weekend.....I have a 2.9 on now, and we are seeing between 50-55% duty cycle with the 42.5, that is at WOT....and I believe 80% duty cycle is the safest, so we will see....

 

i hit 120 kpa with a 2.85, i have the 2.7 in my trunk, waiting for hp tuners to arrive at steed so i can swap for the 60 pounders and other goodies

 

Some people say you wont be fine but i say you will, from personaly expierince.

 

I'm at 116% on a 2.8" with a tad richer Stage 2 tune @ 7000rpm fwiw.

 

2.7 you should be able to get away with 42#s, but in the higher RPMs you may run lean. I calculated that the 42# should be good to about 260 HP which would calculate out to a 2.8" pulley (which should give around 255 HP). Going to a 2.7" will put you at about 260 or a little more HP which is the very top end of the injector's ability which could cause a lean condition.

 

You'll be fine, and that is from personal experience. You can read my thread here:

https://www.cobaltss.net/forums/2-0l-lsj-performance-tech-47/billetflow-2-7-42lb-injectors-installed-tuned-28190/

Chris