LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Normal Injector Duty Cyle %s

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Old Jul 11, 2011 | 07:02 PM
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Default Normal Injector Duty Cyle %s

Just wondering whats the best injector duty cycle to know that your injectors are not being maxed out of not keeping up? Just did a full tune on my new setup and seems like something is not keeping up as my cam is supposed to pull to 6100 which is does but then it dies right out like it hits the limiter and pulls back. Im thinking my injectors are maxed out then it gets to that point. Everything in the tune is spot on and runs mint just think this cam should pull and go past 6100ish. Right now my Accel Black Top 30#s are sitting at 86-88% WOT.
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Old Jul 11, 2011 | 07:03 PM
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Most agree that over 80% is not safe.

IDC% is % of time the injector is firing. At 100% they are never closed.
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Old Jul 11, 2011 | 07:29 PM
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Could that be why my they might be maxing right out at my peak and causing it to fall on its face? My a/f is flat lined 12.5 when WOT.
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Old Jul 11, 2011 | 08:35 PM
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If anything that's rich. You could lean it out and probably pick up some power. 80s for idc is not bad, it's just not ideal.

You're injectors flow plenty. Lean out the tune to see if you get any gains.
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Old Jul 12, 2011 | 04:25 AM
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I leaned it out to 12.8 and lost 8rwhp which I thought was weird as it shouldve gained. Oh well it runs damn good for what it is just wanted to ask and find out. Thanks!
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Old Jul 12, 2011 | 07:37 AM
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Any possibility your getting valve float?
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Old Jul 12, 2011 | 09:00 AM
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Originally Posted by Mystery Bird
Any possibility your getting valve float?
Sounds like float to me.
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Old Jul 12, 2011 | 04:54 PM
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Heads were professionally setup before being installed and running a more then safe set of PAC 1518 springs. This is my first h/c build so i know im worrying and making things sound worse then they are.
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