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Injector duty cycle ?'s

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Old Jan 14, 2003 | 06:01 PM
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Default Injector duty cycle ?'s

What size are the stock(Y2K)injectors and at what RWHP are they at 80% duty cycle? TIA!
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Old Jan 14, 2003 | 06:14 PM
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Default Re: Injector duty cycle ?'s

26.4 lb/hr

Depends on several factors, not the least of which is what RPM you're talking about. Rough guess for an average LS1? About 380 RWHP.
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Old Jan 14, 2003 | 06:35 PM
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Default Re: Injector duty cycle ?'s

Thanx Colonal.....so....if after this next head swap, I see my target RWHP of 42X and am shifting at 6600, I'm big time running out of fuel...yes?

Don't have access to ATAP so, IYHO should I be stepping up to an SVO 30# injector to be safe?

Thanx!
Mike
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Old Jan 14, 2003 | 06:42 PM
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Default Re: Injector duty cycle ?'s

While I'm at it, could someone tell me what the stock fuel pump ratings are? Thanx again!
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Old Jan 14, 2003 | 06:53 PM
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Default Re: Injector duty cycle ?'s

Nah, it'll support 42x RWHP shifting at 6600. It won't be at %80, but it'll do it. People around here do that and more all the time with stock injectors.

Make it ~450 RWHP and I say step up to some SVO 30s (actually 36 lb/hr at LS1 fuel pressure) or better.

However, if you plan to run WOT for extended periods (Silver State Classic type of stuff) then I might look at upgrading at 425 RWHP or so.
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Old Jan 14, 2003 | 06:55 PM
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Default Re: Injector duty cycle ?'s

I don't know the ratings but I know that I completely maxed my '00 out at 470 RWHP.
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Old Jan 14, 2003 | 07:27 PM
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Default Re: Injector duty cycle ?'s

Thanx a bunch! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
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Old Jan 15, 2003 | 09:17 AM
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Default Re: Injector duty cycle ?'s

At 389 RWHP, in an auto, mine were at 90%

This is in a 01 SS.
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Old Jan 15, 2003 | 09:59 AM
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Default Re: Injector duty cycle ?'s

Hmmm......hoping to be in the 440+ range after the X1 w/the new 5.3's <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> but w/the T1, 42x is prolly more realistic <img border="0" title="" alt="[Frown]" src="gr_sad.gif" /> May just nut up and do the SVO 30's. Where are you guys that have upgraded getting them and how much are we looking at?
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Old Jan 15, 2003 | 11:16 AM
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Default Re: Injector duty cycle ?'s

"At 389 RWHP, in an auto, mine were at 90%"

And the strange thing is I'd be willing to bet you could pull 450 RWHP while maintaining correct mixture with those injectors, assuming fuel pressure is maintained. These injector pulse width calculations have always been kinda screwy to me. They just never make sense. <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
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