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Injector help!

Injector help!

Postby Serenade Sierra [OP] » Jul 29 2012, 8:02am

Hey guys I was wondering if anyone could tell me what size injectors would get more bang for my buck for my engine.
My trucks got a 4.8l, stock other than CAI. Planning on combining injectors with MSD Coil Packs plus a tune as I need to re-calibrate my speedo from 3.23's to 4.10's anyway.
Was looking at 62# injectors but is that too high for a stock 4.8?
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Re: Injector help!

Postby lzn197 » Jul 29 2012, 2:50pm

Sorry but I am not really understanding why you want to change fuel injectors. The stock units flow plenty of fuel.
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Re: Injector help!

Postby Serenade Sierra [OP] » Jul 29 2012, 6:42pm

Because I wanna flow MORE fuel. I just want to know what's a good size to get that isnt overwhelming my engine.
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Re: Injector help!

Postby starspangled6.0 » Jul 29 2012, 6:49pm

Have you researched the rest of the fuel system? At some point you'll have to upgrade your fuel pump, too.
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Re: Injector help!

Postby Serenade Sierra [OP] » Jul 29 2012, 6:56pm

Why is that? I figured AEM injectors would just have bigger nozzles and flow more fuel coming out of the stock fuel pump.
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Re: Injector help!

Postby starspangled6.0 » Jul 29 2012, 7:10pm

Right, but at some point you need a bigger pump, since the injectors are putting out so much fuel. I believe you can upgrade your injectors to a certain size and still use the rest of the stock fuel system, but other than that, I'm not much help on fuel systems :cry:. You could ask these guys: http://www.fuelairspark.com/
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Re: Injector help!

Postby camfire87 » Jul 29 2012, 7:27pm

Swapping out injectors is usually one of the last things guys will do when beefing up an engine. If you want more fuel flow, you can actually just get the computer tuned to let more flow through your stock injectors, and that will be way cheaper than new injectors. HOWEVER, be aware that more fuel = more heat = more wear, and you can detonate the motor if you get too crazy.

If you're wanting more power out of the engine, and obviously aren't concerned about fuel mileage, then I would say you will get a much better bang for your buck by getting some high performance exhaust (by letting more air flow out it will help your CAI be more effective, and will also let the motor put more fuel through all on its own).

High performance coil packs are a good idea. More spark = better burn = more efficient power production. Either getting a plug and play tuner, or getting the computer tuned is probably one of the best buys that you can get. It will maximize the power you have out the engine just as it sits now. You might be shocked at what a difference that makes.

As far as your question goes about that size injector being too big, no injector size is too big, as long as you have a fuel pump that can keep up to it, and enough airflow (both in AND out) to keep it burning properly.
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Re: Injector help!

Postby Applegarth » Jul 31 2012, 3:45am

If you install larger fuel injectors with a tune, you won't flow more fuel into the engine because the computer will adjust the flow of fuel accordingly. Normal driving, the truck mandates 14.68:1 Air/Fuel ratio, and WOT goes down to about 12.5. 12.5 is the perfect Air/Fuel ratio for power (naturally aspirated engines), any more fuel will reduce the power of the engine. Too much fuel and you run the risk of washing the oil off your cylinder walls, which would lead to premature engine wear.

If you try and trick the engine by installing larger injectors without tuning...your O2 sensors will detect that you're running rich and try to fix it. You will get a Check Engine light because you will be running so rich.

For the size...62 lb/hr injectors are big enough for a supercharged 6.2l Camaro running 10 PSI. That runs about 80% duty cycle, but your stock fuel pump wouldn't be able to keep up.
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Re: Injector help!

Postby camfire87 » Aug 01 2012, 3:12am

^ AND what he said....
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