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higher lb fuel injectors

higher lb fuel injectors

Postby 04 silver ext cab [OP] » Feb 15 2020, 7:02am

Sorry if this has been asked before but I could not find any reference to it in the forums, but I am wondering what the lb pressure is for a stock 2004 5.3l motor fuel injector and if higher lb will help with performance or milage, either way up or down.

The engine is stock but someone before me has removed the muffler and it is straight piped from the Y pipe back and still has the cats. non flex fuel truck.

Thank you.
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Re: higher lb fuel injectors

Postby Chevboy0167Chevboy0167 is online! » Feb 15 2020, 9:15am

Don't know the LB numbers but bigger injectors in a stock engine setup will not help. You only need bigger if you are going to turbo or super charge the engine.

They are "air compressors" just like every gasoline engine is. The more air you pull in, the more fuel needed and vice versa. Air filter setup, MAF sensor, air tract tube, throttle body, intake plenum, cam, fuel delivery and head changes to bigger specs would almost all be needed on a naturally aspirated engine to get big performance gains.

Then you have to get all that burnt fuel and air out of engine so a less restricted exhaust will be needed. With all this, millage usually goes down. You never see a 70's built muscle car get 15+ mpg!!!
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Re: higher lb fuel injectors

Postby Chevboy0167Chevboy0167 is online! » Feb 15 2020, 9:25am

My mechanic helped his son do a complete rebuild on an 2005 1500 Silverado with a 5.3L. Body, frame, motor, tranny, transfer case, front/rear diffs. And added lift kit, bigger tires and the whole enchilada!

He put a supercharger on that thing and had to go with bigger injectors, bigger fuel pump in tank with larger fuel pickup and larger fuel lines, custom ECM tuning, custom transmission module tuning, custom stainless exhaust and the list goes on.

The truck is a beast to say the least even at 10-12 psi of boost! But she will never pass a gas station and it wasn't built to! Just a blast to drive!!!! LOL
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Re: higher lb fuel injectors

Postby B52Bombardier1 » Feb 15 2020, 10:29am

I can't say what you have for your 2004 model 5.3 engine but they are 26 pounds of fuel per hour Multek injectors that are stock on my 1999 5.3 engine.

And they operate at 58-60 PSI from my fuel pump.

Rick

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Re: higher lb fuel injectors

Postby silentbravo » Feb 15 2020, 6:09pm

99-06 will be similar or the same injectors. Between 24-28 pounds per hour is all these trucks had, from 4.8L to 6.0L

If you have flex fuel capable, then they go above 30 pph.

No reason to "upgrade" them unless you are doing significant power adder mods.
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Re: higher lb fuel injectors

Postby 04 silver ext cab [OP] » Feb 15 2020, 6:58pm

Thank you for the answers, I was looking at fuel injectors because I need to replace them and was just wondering if going with higher flow would improve things, make them worse or not do anything.
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Re: higher lb fuel injectors

Postby Chevboy0167Chevboy0167 is online! » Feb 15 2020, 10:59pm

Yeah... just go with OEM injectors. Your wallet with thank you!
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