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Unread 09-01-2008, 08:20 AM   #1
jimc_65
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mustang GT injectors

what year GT inujectors will fit my '89 cherokee 4.0L? Any modifications necessary with fuel rail or anything else?

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Unread 09-01-2008, 09:35 AM   #2
HeepToJeep
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Direct swap, no modifications needed.

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Unread 09-01-2008, 10:44 AM   #3
Dannn
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what is the benefit of changing them? and will all of those fit a 98?
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Unread 09-01-2008, 10:46 AM   #4
eflores
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i have a set of the 318 5.2 dodge injectors....what is the difference in lbs or what ever its called
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Unread 09-01-2008, 11:17 AM   #5
Sublimize23
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I know most stock GT injectors are 19#.
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Unread 09-01-2008, 11:35 AM   #6
Saudade
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Check out Dino's site.

http://www.jeep4.0performance.4mg.com/tech_specs.html

The static flow rate must match unless you're running a stroker. The '98 needs a higher rated FI than the ones above.

As far as the Renix goes, the injectors offer a better spray pattern that can result in a better burn. I noticed an improvement in throttle response on my '88 but can't say I gained any noticeable HP. I got a set of 8 on eBay for about $50.
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Unread 09-01-2008, 12:46 PM   #7
jimc_65
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heep...i plan on installing a cold air intake too. I was going to buy 19lbs. mustang gt injectors. Will they give me significant HP and performance improvement? What injectors do you recommend for the best performance?
is a stock fuel pump ok for high performance gt injectors?

Last edited by jimc_65; 09-01-2008 at 01:32 PM.. Reason: added question
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Unread 09-01-2008, 07:00 PM   #8
HeepToJeep
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Quote:
Originally Posted by jimc_65 View Post
heep...i plan on installing a cold air intake too. I was going to buy 19lbs. mustang gt injectors. Will they give me significant HP and performance improvement? What injectors do you recommend for the best performance? is a stock fuel pump ok for high performance gt injectors?
Your stock injectors run at 18.6lb/hr and only have two holes in the injector discs, the upgrades are 19lb/hr and have four smaller holes in the injector discs. The slightly higher fuel pressure doesn't do nearly as much as the four smaller holes in the discs because they send more of the fuel into the cylinder fully atomized (as a vapor which burns better). Unless your current injectors are shot you aren't going to notice a huge difference but you will be able to tell there's a faster throttle response, smoother running and a little better fuel milage.

Your stock fuel pump will work fine with the 19lb/hr injectors as they aren't dumping a lot more fuel into the engine, they're simply making better use of the fuel it was already getting. Regardless of which brand of injectors or 'donor vehicle' you decide on it's not going to make a difference as they're going to be 19lb/hr and have the four hole discs.....I tried both the yellow top Bosch and gray Ford injectors and was unable to tell any difference at all between them.

When I caught wind of this 'possible upgrade' instead of shelling out big bucks for new injectors on a maybe I went and grabbed some good ones from the boneyard to experiment with....cheap, plentiful, easy to pull and you can tell right away if the injectors are old as the heat and fuel discolors them with age.

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Unread 09-01-2008, 07:09 PM   #9
Toliver09
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Could running 24 lb injectors cause problems in a 92 cherokee? I have a set sitting here that i bought just for the jeep, but have no idea if I will be able to do this without going to a high flow pump
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Unread 09-01-2008, 07:15 PM   #10
XJLI
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Quote:
Originally Posted by Toliver09 View Post
Could running 24 lb injectors cause problems in a 92 cherokee? I have a set sitting here that i bought just for the jeep, but have no idea if I will be able to do this without going to a high flow pump
Quote:
'91-'93, ........33007127, ...Brown, .......39psi, .................21.0lb/hr
24 will be too rich.
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Unread 09-01-2008, 07:17 PM   #11
Toliver09
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Originally Posted by XJLI View Post
24 will be too rich.
what if I ran a bored out tb, high flow intake? I can get my pcm reprogrammed for next to nothing if I had to just to make it work
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Unread 09-01-2008, 07:26 PM   #12
XJLI
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im running a cowl intake, bored tb, apn header, hi flow cat, and hi flow muffler and havent had a problem with running lean. reprogramming the ECU isnt worth it IMHO. look into an adjustable MAP if anything, thats one of the next thing on my list.

http://go.jeep-xj.info/HowtoMAPsensor.htm
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Unread 09-01-2008, 09:20 PM   #13
HeepToJeep
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Quote:
Originally Posted by Toliver09 View Post
what if I ran a bored out tb, high flow intake? I can get my pcm reprogrammed for next to nothing if I had to just to make it work
If you're really interested in tweaking a 4.0 I strongly suggest going to the following page, I've turned the web upside down and have never come across one single source that offered as much GOOD information as Dino offers.

http://www.jeep4.0performance.4mg.com/index.html

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Unread 09-01-2008, 09:36 PM   #14
tangofox007
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Originally Posted by XJLI View Post
24 will be too rich.
Why? Wouldn't an increase in volume be offset by a shorter duty cycle?
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Unread 09-01-2008, 09:49 PM   #15
XJLI
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Quote:
Originally Posted by tangofox007 View Post
Why? Wouldn't an increase in volume be offset by a shorter duty cycle?
wheres the 'you have surpassed my knowledge of motors' smiley?
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