Inj duty Cycle %
Thread Starter
Joined: Jun 2002
Posts: 2,062
Likes: 1
From: L-Town N.Y.
Inj duty Cycle % I had gotten my car dynoed and tuned about a month ago and when i got hom I was checking the logs and my inj duty % was @ 112-115 at peak. I picked up a set of svo 30# injectors and installed them. I put in the values I got from redhardsupras website and I thought all was fine. I went out and made a couple of passes tonight and I see my duty % is still in 90`s. It is only 25 degees outside . Any ideas?
Last edited by offaxis; Feb 20, 2006 at 08:21 AM.
is this what you have
34.64162706 34.85752419 35.07209232 35.2853557 35.49733784 35.70806157 35.91754903 36.12582173 36.33290055 36.5388058 36.74355721 36.94717396 37.14967471 37.3510776 37.55140031 37.75066003 37.9488735
34.64162706 34.85752419 35.07209232 35.2853557 35.49733784 35.70806157 35.91754903 36.12582173 36.33290055 36.5388058 36.74355721 36.94717396 37.14967471 37.3510776 37.55140031 37.75066003 37.9488735
you're probably runnin rich...i.e. runnin low 12's @WOT will tax the injectors more, if you lean it out some the duty cycle will drop....of course without more info i cant tell you by how much
Hmmmmmmm...along the same lines, it was 50 degrees out here yesterday, and with my stock internaled, bolt-on car, my IDC maxed out at ~88% with the stock 28lb-ers. I'm wondering what kinda injectors I'll really need when it comes heads/cam time for me...SVO 30s don't seem to be the universal answer anymore.
Thread Starter
Joined: Jun 2002
Posts: 2,062
Likes: 1
From: L-Town N.Y.
Originally Posted by Moparnos (The SLP Guy)
is this what you have
34.64162706 34.85752419 35.07209232 35.2853557 35.49733784 35.70806157 35.91754903 36.12582173 36.33290055 36.5388058 36.74355721 36.94717396 37.14967471 37.3510776 37.55140031 37.75066003 37.9488735
34.64162706 34.85752419 35.07209232 35.2853557 35.49733784 35.70806157 35.91754903 36.12582173 36.33290055 36.5388058 36.74355721 36.94717396 37.14967471 37.3510776 37.55140031 37.75066003 37.9488735
Originally Posted by MeentSS02
Hmmmmmmm...along the same lines, it was 50 degrees out here yesterday, and with my stock internaled, bolt-on car, my IDC maxed out at ~88% with the stock 28lb-ers. I'm wondering what kinda injectors I'll really need when it comes heads/cam time for me...SVO 30s don't seem to be the universal answer anymore.
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how did you know they were ok? have you ever measured the pulse width? was your IFR table calculated properly or was it used for 'tuning'? did you verify that AFR was good even at high rpm? injectors can seem 'fine' if you don't mind running at 130% duty cycle or you just don't rev it much. one's dangerous, and the other is just slow.
remember that:
injector duty cycle=injector pulse width*rpm/1200
unless your injectors are calibrated properly and you monitor rpms alongside with pulse width, you will never know the truth. 'pro' tuners will not tell you how high you went on duty cycle, becuase they usually just use IFR to 'tune' your car.
remember that:
injector duty cycle=injector pulse width*rpm/1200
unless your injectors are calibrated properly and you monitor rpms alongside with pulse width, you will never know the truth. 'pro' tuners will not tell you how high you went on duty cycle, becuase they usually just use IFR to 'tune' your car.
Originally Posted by RedHardSupra
how did you know they were ok? have you ever measured the pulse width? was your IFR table calculated properly or was it used for 'tuning'? did you verify that AFR was good even at high rpm? injectors can seem 'fine' if you don't mind running at 130% duty cycle or you just don't rev it much. one's dangerous, and the other is just slow.
remember that:
injector duty cycle=injector pulse width*rpm/1200
unless your injectors are calibrated properly and you monitor rpms alongside with pulse width, you will never know the truth. 'pro' tuners will not tell you how high you went on duty cycle, becuase they usually just use IFR to 'tune' your car.
remember that:
injector duty cycle=injector pulse width*rpm/1200
unless your injectors are calibrated properly and you monitor rpms alongside with pulse width, you will never know the truth. 'pro' tuners will not tell you how high you went on duty cycle, becuase they usually just use IFR to 'tune' your car.
I was definitely surprised when I saw how high mine was on my car, and I haven't even touched the engine
