Injector Duty Cycle 110%??
This was questioned a few years ago. Here's one easy example I could find:
https://www.evolutionm.net/forums/ec...culations.html
I don't think we ever had a true conclusion on it (or if we did, I don't remember or didn't read the thread) but clearly if the IDC being logged was truly accurate then you'd never be able to richen the AFR of a car in a controlled fashion once it got past the static threshold (which would be before 100%). And we know that you can still richen the AFR of a car into at least the early 100s....
Be interesting to see what the latest news on this is.
Last edited by codgi; Nov 16, 2010 at 09:26 PM.
Eh thanks for the advice guys I plan on picking up some ID1000cc injectors friday from AWD. I just wanted to clarify my issue. So at this point Ide have to go back to my original thinking. I need bigger injectors. I was just noticing the type of power alot of these guys are making and they never mention there using anything bigger then stock injectors and it had me confused. I just thought it was next to impossible for any AWD car with 560cc injectors to be making 350-360whp (Im referring to EVO IX's with bolt ons and cams) with out a FPR.
My friends '05 with a br intake, br delux fmic, forge mbc, evo 9 bov, turbo xs 3" tbe and a walbor was running 96% idc untuned running 20si peak and 19psi red. In the 5500-7200rpm range the car went from around 10.3 to 9.8afr. After the tune the car ran 10.6 to 11.1afr in the same rpm range and the idc fell to around 92-94% according to evoscan with the boost untouched. Now in your situation you're running about a half point leaner afr's and 2-3psi more so I hope you can see what I'm attributing as the most probable factor(lower the boost). Try boosting 19psi, log it and adjust the timing accordingly...unless you want to go the bigger injectors route. With the 3 mods you have you could make 310-320whp(dynojet) on an semi agressive tune at around 20psi. Most of the the difference in the 2-3psi more with your setup is going to be more torque at peak spool and a higher egt. Just my .02 hope it steers you in the right direction.
^^^^^^ Crap like that boggles my mind. My boost is tapering like that towards redline but Im not making that kind of power.
I could still add fuel till around 164% idc, this is where the afr wouldnt change at all. And again this was not on purpose, I was not logging idc as my laptop at the time was extremely slow and I was logging as few things as possible, rpm, load, afr, timing, knock.
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Joined: Sep 2010
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From: Coral Springs FL
Give yourself some room, get 1200's instead.
Eh thanks for the advice guys I plan on picking up some ID1000cc injectors friday from AWD. I just wanted to clarify my issue. So at this point Ide have to go back to my original thinking. I need bigger injectors. I was just noticing the type of power alot of these guys are making and they never mention there using anything bigger then stock injectors and it had me confused. I just thought it was next to impossible for any AWD car with 560cc injectors to be making 350-360whp (Im referring to EVO IX's with bolt ons and cams) with out a FPR.
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mxguy1286
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Jan 18, 2012 06:47 PM
