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Old April 7th, 2015, 01:17 PM   #1
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Injectors and Max Duty Cycle

So I've been adding mods for awhile, and while I'm datalogging I noticed I've never gone above 79% duty cycle with my stock injectors. Do these stock 270cc's max around 80%? I'm guessing I need new injectors, so what are our choices? Any direct drop ins from the 310cc mdx or tl injectors?

As far as engine mods I have j32a3 block, ported j35a8 heads, full bolt ons with port matching even in the 3.7 tb and mani, tuned, and underdrive pulley.
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Old April 7th, 2015, 01:29 PM   #2
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I think you want to run the injectors around 65-85% duty cycle.

I have 3 TL-S 310cc injector that I can sell for cheap if you are interested (35 shipped). You might be able to get away with just dropping them in, but hondata is definitely preferred. I have 310cc on my j30a5 with hondata. Before hondata it was running rich and smelt like gasoline.
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Old April 7th, 2015, 02:31 PM   #3
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Oh I thought the duty cycle measured the % of work an injector is operating at compared to its max capability.
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Old April 7th, 2015, 02:32 PM   #4
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What data can we read to determine if an injector is maxed out? I suppose the car will just start running lean huh....
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Old April 7th, 2015, 03:07 PM   #5
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you have hondata right? Datalog a WOT run and export the data to an excel. My car duty cycle is around 64-67% at 6800. I need to raise the redline still.

open flashpro and load your datalog --> under the flashpro tab click --> export

it comes out as a excel. Look at your WOT run.
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Old April 7th, 2015, 04:57 PM   #6
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310's should be good. I maxed out/leaned my J30 out on stock 270's. I run 410's now ams NA I've only seen 56% duty.

I thought duty was the operating time/opening time of the injector. Example " my injectors opening is this big. To spray this much gas my injectors need to open (duty) for this long. Running 85% duty/of the time is a lot of work for them.
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Old April 7th, 2015, 05:18 PM   #7
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duty cycle is how fast the injector can open. Having it run maxed out, it get stuck and you don't get a nice atomization anymore. You just get a steam. I swapped mine so that I could get better atomization and that helps with the burning of the fuel.

Last edited by thisaznboi88; April 7th, 2015 at 05:48 PM..
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Old April 7th, 2015, 05:36 PM   #8
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I'm just surprised I haven't maxed mine out yet...at least I don't think.
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Old April 8th, 2015, 04:12 AM   #9
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Quote:
Originally Posted by thisaznboi88 View Post
duty cycle is how fast the injector can open. Having it run maxed out, it get stuck and you don't get a nice atomization anymore. You just get a steam. I swapped mine so that I could get better atomization and that helps with the burning of the fuel.
Duty cycle is the amount of "ON" time in every engine cycle. Many injectors once they reach greater than 80% on time will saturate and basically stay on which will throw off the AFR for that cylinder. Injector sizing is important too small and you can not control or even feed enough fuel for a proper combustion cycle, too large of a injector and you will then get too much fuel at idle and low throttle cruise.
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Old April 8th, 2015, 06:22 AM   #10
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Duty cycle is the amount of "ON" time in every engine cycle. Many injectors once they reach greater than 80% on time will saturate and basically stay on which will throw off the AFR for that cylinder. Injector sizing is important too small and you can not control or even feed enough fuel for a proper combustion cycle, too large of a injector and you will then get too much fuel at idle and low throttle cruise.
Ah gotcha thanks. Btw dont you have a supercharged J37? you shold definitely make some acceleration videos for us to revel in
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Old April 9th, 2015, 04:05 AM   #11
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LOL, at least right now my car is sickeningly STOCK. Been waiting 12 weeks for pistons from Weisco and been really busy getting others cars built.
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Old April 13th, 2015, 10:16 PM   #12
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My duty cycle want maxed out.... but I will have to check old logs to confirm
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