When do I need to upgrade fuel injectors?
Thread Starter
TECH Enthusiast
Joined: Jan 2004
Posts: 611
Likes: 0
From: Fairfield, CA
When do I need to upgrade fuel injectors? At what point in my build up do I need to worry about maxing out my stock 99 injectors? After changing my intake manifold, I realized they are really easy to change, so now that I am not intimidated by them, will I see a change if I upgrade?
you need to change them when your duty cycle goes above 80%
-some people are fine cam only- some are fine after heads and cam
I was OK with 28# after cam only- I upgraded after 75 dry shot on top of cam only
-some people are fine cam only- some are fine after heads and cam
I was OK with 28# after cam only- I upgraded after 75 dry shot on top of cam only
99s have the crappy injectors cause they are smaller than the rest of the years(26.6 vs 28.8) I heard that the stock injectors are good enough for around 400 hp. if you are only boltons, no cam or nitrous, i doubt its worth upgrading. also, you will HAVE to get a tune after changin injector sizes, although not a full tune. otherwise u will run rich as hell
Thread Starter
TECH Enthusiast
Joined: Jan 2004
Posts: 611
Likes: 0
From: Fairfield, CA
So I am good for now, I have only bolt-ons, no nitrous, no cam. I will change them when I do a cam swap since I will be getting a tune anyway. If I plan on going with a TR 224 114 cam, what size injectors should I run?
I'm not trying ot Hi-jack your thread, it looks like I'm in the same boat you'll be in soon.
I have a 99 Z28 Running a TR224 112 LSA cam, LTs, LS6 intake...full bolt-ons. It put down 381RWHP (460 at the flywheel). Are these 26.6 lb injectors holding us back? What are the 99' injectors good up to?
I have a 99 Z28 Running a TR224 112 LSA cam, LTs, LS6 intake...full bolt-ons. It put down 381RWHP (460 at the flywheel). Are these 26.6 lb injectors holding us back? What are the 99' injectors good up to?
Last edited by thunderdan74; Feb 20, 2006 at 04:12 PM.
I'm running stock injectors with a TR224 cam. My duty cycle is 98%. A friend has an LS2 402 and is at 104% duty cycle. His car is also running pig rich right now. I have no issues either.
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Not according to this
http://www.rceng.com/technical.htm
I put in these numbers top to bottom 460, 8, .50, .80, 58. It tells me I need 31 LB injectors. Am I using the wrong fuel PSI or BFSC?
http://www.rceng.com/technical.htm
I put in these numbers top to bottom 460, 8, .50, .80, 58. It tells me I need 31 LB injectors. Am I using the wrong fuel PSI or BFSC?
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