half-n-half

iTrader: (7)

hye guys i am getting a cam and nitrous and other things in the next month or so, so i am looking to upgrade injectors for the tune. i figure 30s 0r 36s would be good, but would there be anything wrong with going to a larger one, like a 42 lb injector and then possibly growing into it later with a 2nd dtage dry shot, or a larger displacement motor?

right now i will have a wet shot, and a large cam.

Thanks
Louie

oange ss

iTrader: (50)

yes there is

RedHardSupra

iTrader: (1)

svo 42s (48#@gm pressure) are not big at all. supra's come with 550cc injectors stock (that's like 53#) and idle like a lexus. i've seen cars with 1600cc injectors idle just fine. it's more of a question of configuration than the hardware itself.
get yourself the 42s and you'll be happy and safe to about 500-550rwhp

mdhmi

iTrader: (1)

Idle is only part of it. Generally the smaller the injector the better the spray pattern and drivability, although many of the drivability issues can be addressed with a good tune.

Mark

OlieAV

you can run way too rich, for a start

MIGHTYMOUSE

iTrader: (59)

you obviously dont want to change injectors at all without the capability to calibrate the computer for them.


i would step up so that you won't have to do it again later.

i never had problems getting good idle and part throttle from mototron 60's on a 346ci engine

i currently run 96's in a 366ci engine fine but did have some problems with idle AFR control w/ same engine and 160# injectors

Brody

iTrader: (3)

I had the same question:

*Assuming you have them scaled properly (i have HPTuners)...

Are there ANY disadvantages to larger injectors. I heard someone say drivablity but he didn't follow up as to why. Going AFR H/C and want to be able to throw a 100 shot on it in the future. I'd rather just buy injectors once.

dc96819

If your injectors are to large change the duty cycle,that might work.

RedHardSupra

iTrader: (1)

you don't change duty cycle, duty cycle changes for you, if you change injectors/calibration. it's a derivative of rpms and injector pulse width. PCM section has stickies for it.