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GENERAL MOTORS SPECIFIC FORUMS
GM Engine & Exhaust Performance
what size injectors?
GM Engine & Exhaust Performance
EFI | GEN I/GEN II/GEN III/GEN IV Engines |Small Block | Big Block |
what size injectors?
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Dec 18, 2006 | 11:54 AM
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WJ MARK
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what size injectors?
What size injectors does the 5.3 have???
With my mods what size should I go up to?
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Dec 18, 2006 | 11:59 AM
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thunder550
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The 5.3 stock has something like 24 or 26 #, can't remember exactly. You should move up to 42# with a bigger in-tank pump or an auxiliary inline pump.
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Dec 18, 2006 | 12:18 PM
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WJ MARK
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I have an inline pump and fmu that came with the kit.
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Dec 18, 2006 | 07:07 PM
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ogkevin13
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walbro 255 lph and some #44 multi. injectors
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Dec 18, 2006 | 07:38 PM
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Nick™
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make sure you retune for the new injectors or you'll run really rich
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Dec 18, 2006 | 10:48 PM
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WJ MARK
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wouldn't the computer retune itself after driving around for a while??? so you guys think around 42-44 lb. injectors??? Thats what I was thinking.
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Dec 19, 2006 | 12:40 AM
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i think you need a tune!!
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Dec 19, 2006 | 05:48 PM
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Mort
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You will definitely need to tune for the bigger injectors.
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Dec 19, 2006 | 09:29 PM
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yeah the computer won't "learn" the injector size. you have to tell it what size they are.
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Dec 21, 2006 | 03:32 AM
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tweeder
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I think that the 5.3 had 19 lb/hr injectors
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