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Will bigger Injectors help performance?

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Old Sep 7, 2009 | 11:20 PM
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From: St. Louis Mo
Default Will bigger Injectors help performance?

I didn t know much about injector duty cycle % when i had my car dynoed-tuned last yr. Currently i have 36-37#hr inj on a 427. If i install my 63# High impedence Semiens injectors, will i have any performance improvement? Or should i just sell my Aftermarket Fuel Rails/63# inj? On a Dynojet It should be really close to 600 at the wheels(it was 539rwhp with 163* IATs(now fixed) and a Slipping clutch(Now fixed and broke-in), and i ve added some more bolt-ons).
Are the smaller injectors @ a higher % duty cycle better than bigger, High Impedence injectors at a lower % Duty cycle? (im aware that it ll need to be tuned for the bigger inj) - Sorry if i left something important out. Im @ the point of either using the injectors/High flow fuel rail or selling them if i don t need them. Thanks!!- Jason
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Old Sep 8, 2009 | 01:17 AM
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From: Leon Iowa
St. Jude Donor '06-'07-'08-'09
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As long as your injectors are not over the 80% duty cycle there is no need to go bigger. You won't gain anything if you are in range. Now if you are over then yes you may gain a little.
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Old Sep 8, 2009 | 04:27 PM
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Originally Posted by mvvette97
As long as your injectors are not over the 80% duty cycle there is no need to go bigger. You won't gain anything if you are in range. Now if you are over then yes you may gain a little.
Thanks! I read about someone running over 100% duty cycle-LOL Ill bet that my injectors are running at least 80%.
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Old Sep 8, 2009 | 05:25 PM
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Those 36-37lbers are really 42-43s at our fuel pressure. You should be fine there -- that's what I'm running in my 427. To be safe, have a buddy log a wot run and check your IDCs.
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