I think you summed it up

 

has anyone tried bumping our FP up to compensate for injector ratings? I dont have a FP gauge anyone know what we have for FP?
On my sunfire Eco I get 42-43psi idle and it bumps to 56 at WOT....
that would change the injector ratings definitely....
they usually rate the 42lb injectors at 43.5psi....

 

I agree. He did run the Maf-t when he had his 3.0. Now hes down to a 2.6 Hp tuner with the same injectors. I was only using it as an example.

 

I don't get it, on the stage 2 tune, 2.8" pulley, CAI, and exhaust I was running incredibly rich, off the charts rich. Ignore the green run, a/f wasn't hooked up, the blue run was after a custom tune. The red run is the one with the above setup:



The guy tuning my car didn't give me any number in specific, he just told me my injectors where far from taxed when I asked him about them.

 

my tuner says the 42.5 injectors are fine with a 2.85 pulley, hes gonna chec them out when the car goes in for a tune.

 

finally dyno proof. thx for that.

edit: I take that back the run wasn't to 7000rpm ... still looking for dyno proof then

 

how do i get my dynos online like that. i have mine still in the dyno program on my home computer.

I plan on getting dynoed soon with my stage 2 2.9 setup and then stage 2 2.7. without any custom tuning. then I will decide about tuning from there.

 

with what like 7mph less trap speed right ....hehe tell em to run me on the streets...will look like reverse...btw the cobalt ss running my same setup last night went 13.4@108 w/ 2.2xx 60' on stock tires and stock clutch...booyah

 

there should be a print button ?!? but if not open the dyno push print screen open something like paint then paste the picture and save it

 

No..technically anything under 2.9 isnt SAFE...past 100%idc u lose control of fuel injectors and risk damaging them...a 2.6 at 6500rpm with mft is 126%idc...pat and I both had same setup at same time.

114%idc on a 2.8 w/ 42.5lbers at 7000rpm

does it work ya kinda...is it safe...no...but like i said...its your car...just dont cry if/when the injectors fail.

 

ugh....i still cant beleve people dont get what i'm saying 100%.

heres the trick...most of these set ups will totaly max the injecters at7k....if you bump the limiter past that with HPTuners then you most def dont!...

so heres my short version of my rant...

EVEN IF GOD TUNED YOUR CAR YOU DO NOT HAVE ENOUGH FUEL FOR A 2.8/2.7/2.

for the people who clame they do...i'm sorry..thats just not true,...keep an eye on your IDC's...if they go into the 90%'s...guess what!!!! your dont have enough FUEL!!!!!!

an injecter loose's its control ability around the 92% IDC.....

i have a feeling that you think jsut cuz its under 100% your fine....thats not rite!

 

gotcha

 

so with stage 2 and a 2.8 pulley what is the best injector??? and where the best place to find this injectors

thanks

 

someone needs to put up a FULL dyno (ie 7000 rpm pull) with afr and fuel duty cycle ratings. This way we can see where the injectors are maxing out so that we can look at the next step so we can safely mod these things.

 

Well it sounds like 60lb injectors is the way to go with a 2.8" and smaller pulley.
That will be a must because everytime I race I definitely hit 7,000rpm

This freaking sucks. I wanted to slap on a 2.8" pulley before I tuned but now it sounds like that would be pointless. 60lb injectors are expensive. Damn it!

 

can a normal dyno shop note those for me. i am going to rev it up. they do A/f but what about duty cycle?

 

same and with noone showing a full dyno pull we cant see where the issue starts. we would also need to have someone do it that has other mods ie: intake exhaust setup

 

they should be able to show it since they should be able to read what the computer is monitoring but it depends on their software capabilities

 

it's a brand new dyno. so i guess they can.

 

ur afr may be safe now but in winter it def wont be...and over 80% compromises injector durability...why dont u guys believe us its simpe math. Plus ive seen countless logs posted...hell somewhere there are logs from my 2.6@6500 if u search around enough

btw spooner on rl forums saw 112%idc and 13:1 afr at 7000 rpm with gm st2 and a 2.8

Dan

 

ask 06SSg85, i think thats his handle. He was useing 60 lbers with S2 + 2.8 and the injectore duty cycle was 31%, he said he switched back to he's 42.5's which were running higher still under 80 %. But from all the ppl i have talked to about it most said, the 42.5 lbers is the safe edge for stage 2 + 2.8. But obviously a tune would be much better.

 

How is a tune gonna alter the laws of physics...u can only deliver soo much fuel

10lb of **** in a 5lb bucket

put out a fire with a straw...etc

i give up on these people

 

i dont really have time to search which is why I only refresh threads I have been in during the day until I get home. If you know of a dyno image that shows the lean issue please share and post a link so we can view

 

Well my ? is what is the % that a car with just GM Stage 2 no other mods, is at on the 42.5lb injectors? since its a 3" it has to be over 80% doesn't since a 2.8" puts it at about 114% right?

 

because a S2 car with a 2.8 still thinks it has a 3" on it, so fuel will be delievered accordingly, with a tune this can be be resolved. The question is can the injectors deliever enough fuel. You say "no" when I have talked to at least 2 ppl with HPT saying that a 2.8 with 42.5's doesnt max them out. So whos right and whos wrong and whats causes the diffrientation.