Ford Shelby GT500 Forum banner

Looking for a recommendation for bigger injectors

3.5K views 12 replies 5 participants last post by  Catmonkey  
#1 ·
Hey guys I have a 2014 Shelby GT500 with a JLT intake, upper pulley, kennebelle mammoth throttle body and boost a pump, catless Hpipe and corsa extreme axleback. I eventually want to get the 4.7 kennebelle after I get forged internals and cams but for now I want to get bigger injectors to push more power. Any suggestions?
 
#4 ·
I would talk to a tuner about your end state goals. E85 vs 93 vs additives, ect.
There are a few sites that help calculate injector size based on desired HP

With that said, they always say plan for the future so I would go ID1050 at a minimum and really consider ID1300's, especially if going E85
 
#6 ·
The guys at Lund were suggesting ID1300 injectors and going corn fed with the same KB blower and BAP when I was bouncing ideas for my next round of mods with them. They were saying that'll get my '14 to at least 800whp with no concerns.
 
#13 · (Edited)
Don’t believe it. It’s an inferred reading through airflow and has nothing to do with actual atmospheric pressure. Your cams will reduce boost by 3-4 psi over the stock cams.

You can assume that your airflow should be at least as much as an otherwise stock 5.8 with a 2.4" pulley at your reduced boost level, so that's what the factory gauge is seeing. That's also how you're getting away with 1050s. If you spun the blower harder to get to 18 psi with the cams, you'd be in the danger zone. Headers reduce boost pressures too, just not as much. I don't recall if you have them or not. It's easy enough to add a boost gauge to find out where you are.