LS1 Injectors into a 2003 5.3

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Dec 8, 2004 | 02:29 PM

#11

00Z71

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From: ODESSA, TX

8.1 L Injectors are 31 or 32lbs and fit right in, that is what i am running with my charger

Dec 8, 2004 | 05:05 PM

#12

Racetronix

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From: A Racetronix dealer near you...

Quote:

Originally Posted by XLR8NSS

There ain't NO WAY a multec II 43lb(rated at 58psi) injector will support 1000rwhp. At normal fuel pressure(58-59psi) those injectors should be good for 500rwhp maybe just a bit more.

Now you could double the fuel pressure BUT, try to find a pump that can supply fuel at 100+psi and pray that your injectors don't lock up from the high pressure. Pretty much all automobile fuel injectors are not made to operate at pressures like that.

Ain't that the truth.

Dec 11, 2004 | 09:55 PM

#13

GMPartsGuy

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hey thanx for response

Quote:

Originally Posted by gonzo 6.0

wouldnt you already have 24LB. now?

Actually IEM 2003 5.3 injectors vary from 12 to 14 pound sprayers. The Injectors that I have are the stock sprayers from a SS Camaro. By the way never pay SLP too much $$$$$ for their injectors because it's a joke, they are the same OEM factory injectors I have and sell at my store. Here is the GM part number is anyone is intrested #12561462. They cost much less than the SLP fakes.

Dec 11, 2004 | 10:17 PM

#14

BigTex

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From: East of Dallas

Your 2003 5.3 injectors are 24.x pound injectors, unless you have the flex fuel option. If so, then you have over 30# injectors. From the looks of your mods, you don;t have a need for anything larger than the stock injector.

ktmrider - in 1999, the 4.8 and 5.3 had 21 pound injectors. Since then they all came with 24 pounders.

Dec 12, 2004 | 12:58 AM

#15

budhayes3

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From: Hackensack, NJ

Quote:

Originally Posted by BigTex

ktmrider - in 1999, the 4.8 and 5.3 had 21 pound injectors. Since then they all came with 24 pounders.

Yea, I learned that from you guys...then immediately hooked up with a set of 24 pounders from an 02 6.0. I remember the numbers as being 21 lbs in 99, and 24.7 lbs from there on up.

Dec 12, 2004 | 08:09 AM

#16

one03sierra

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From: league city texas

man i wonder if i need to step up to bigger injectors now. especially since i am stepping up to a 175 shot. i am putting in an inline walbro. hmmm. now i wonder if they would help out. i suppose the 8.1's would be enough as well. any suggestions whether i should or not.

Dec 12, 2004 | 05:40 PM

#17

slowprocess

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From: Cleveland Mississippi

I have to step up on my injectors pretty soon. I'm going with some sort of power adder later on next year after I get my suspension setup to my liking.

Dec 13, 2004 | 12:21 AM

#18

Yelo

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From: Geneseo, NY

Quote:

Originally Posted by Yelo

Everyone here does know that the stock injectors will support ~425rwhp right ???......and those Multec II's are SERIOUS OVERKILL unless you are running a BIG turbo, those things will support ~1000rwhp with the right fuel pressure

Um....this is kind of a strange thing to say but, I NEVER TYPED THIS !!!!!!!

Did this post somehow end up under my login name by mistake ????