Mustang injectors? - JeepForum.com

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post #1 of 22 Old 01-06-2009, 05:13 PM Thread Starter
jeepnphreak
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Mustang injectors?

OK so I have been reading about instlling mustang injectors in to renix engines...

what are the benifits to doing so? Will I get better MPG, HP or what.


1989 XJ, 5spd, np231 with bjconversion SYE , re3.5, 33x12.5r15 BFgoodrich ATS, D30 F, Dana 44 from 87 with 4.56s, Custom front bumper.

94 yj: stock everything and 4 angry squarrels under the hood.
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post #2 of 22 Old 01-06-2009, 05:15 PM
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Quote:
Originally Posted by jeepnphreak View Post
OK so I have been reading about instlling mustang injectors in to renix engines...

what are the benifits to doing so? Will I get better MPG, HP or what.
There are 4 "holes" instead of 1 on the bottom of the Mustang 5.0 Injector, to better atomize the fuel, therefore, better, more even combustion. You may get smoother response, but not much MPG increase, if any.
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post #3 of 22 Old 01-06-2009, 05:19 PM
wessker96
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Talk to 88XJSport he knows i think its due to an ineffective design of the injectors where the body itself starts to leak then when you go to work on them the others will get damaged and do the same just by pulling them out ( i have done this on 2 87's I know one was leaking replaced that one and the 3 more will start) But the #19 5.0 fuel injector is the same fuel flow but made of something different that doesnt have the known issue as the ones currently in your jeep. So you can fix and or repair without having to replace all the next time you work on them, (remember to change the seals anytime you replace them) Best answer i can give you which seems from past experience right. Wish I would of known this answer the first time this happened but your fuel injectors will leak one day that is a def with the current design. Thanks for 88XJSport for telling me and I see his post lol way to go hes on it hope i summed it up ok.

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post #4 of 22 Old 01-06-2009, 05:25 PM Thread Starter
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Originally Posted by 88XJSport View Post
There are 4 "holes" instead of 1 on the bottom of the Mustang 5.0 Injector, to better atomize the fuel, therefore, better, more even combustion. You may get smoother response, but not much MPG increase, if any.
Sounds reasonabel enough to try it out
tnanks

1989 XJ, 5spd, np231 with bjconversion SYE , re3.5, 33x12.5r15 BFgoodrich ATS, D30 F, Dana 44 from 87 with 4.56s, Custom front bumper.

94 yj: stock everything and 4 angry squarrels under the hood.
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post #5 of 22 Old 01-06-2009, 05:26 PM
tangofox007
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Quote:
Originally Posted by jeepnphreak View Post
OK so I have been reading about instlling mustang injectors in to renix engines...

what are the benifits to doing so? Will I get better MPG, HP or what.
In installed them in my '88 4.0L a couple of years ago. The engine idles much more smoothly, runs better, has more power. MPG, however, was negatively affected; it went down slightly, not up.
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post #6 of 22 Old 01-06-2009, 05:35 PM
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Originally Posted by 88XJSport View Post
There are 4 "holes" instead of 1 on the bottom of the Mustang 5.0 Injector, to better atomize the fuel, therefore, better, more even combustion. You may get smoother response, but not much MPG increase, if any.
OEM Ford injectors don't have these 4 holes, only the single hole right after the needle. A/M injectors I've seen have them, but OE Ford orange top injectors that were in the Fox body Mustangs or the "5.0" were not like that.

-Dustin

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post #7 of 22 Old 01-06-2009, 05:37 PM
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Thanks wessker96

Again...this is all from what Ive read. I personally didn't use 5.0 injectors. I have a problem with putting any "used" mechanical parts, especially engine management parts on my XJ, I bought 6 new 88 Cherokee Injectors for $297. Engine runs much smoother than before, better pickup, and no MPG loss, like I would have if I used 5.0 injectors. If I was up to it, I would have bought NEW 5.0 injectors. But I wasnt about to pay 129 a piece.
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post #8 of 22 Old 01-06-2009, 05:38 PM
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Originally Posted by QuarterHorse View Post
OEM Ford injectors don't have these 4 holes, only the single hole right after the needle. A/M injectors I've seen have them, but OE Ford orange top injectors that were in the Fox body Mustangs or the "5.0" were not like that.
I am writing based on what Ive heard...

You make sense though...because my brand new 88 Cherokee injectors had 4 holes.
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post #9 of 22 Old 01-06-2009, 05:40 PM
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I'm just telling you what I've pulled off of my fair share of Mustangs/Lightnings.

-Dustin

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'92 Mustang Coupe - It's Mustang stock....
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post #10 of 22 Old 01-06-2009, 06:32 PM
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I used 4.6L injectors off a crown vic. They were rebuilt with new screens. For $30 I couldnt go wrong. Deffinitly a lot smoother.

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post #11 of 22 Old 01-06-2009, 06:42 PM
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Yeah when you get into 03 Cobra injectors they get a little different and are a "39.5" injector but closer to a 42.

-Dustin

Jeep-less at the moment
'92 Mustang Coupe - It's Mustang stock....
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post #12 of 22 Old 01-06-2009, 07:11 PM
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Here's a closeup of the orange tops (OK, orange bottoms) I got on ebay from a 5.0. I did not notice any mileage drop after the replacement. It's been a couple of years now that I've been running them.

Of course, the black one is the original.

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post #13 of 22 Old 01-06-2009, 09:11 PM
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Check this out
http://www.jeepforum.com/forum/f11/upgrade-bosch-design-3-injectors-658611/

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post #14 of 22 Old 03-17-2009, 07:19 PM
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You can find the 19# mustang injectors on ebay for pretty cheap. I just got a set of 8 for less than 50 bucks. The inherent benefit for me of the new injectors is that they have a superior design to the RENIX injectors that I was running. My RENIX injectors leaked really bad, so my mileage went up, barely, because all of the fuel i pumped was actually getting from the rail to the combustion chamber and not leaking out.
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post #15 of 22 Old 03-17-2009, 08:00 PM
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I purchased this set of Mustang Injectors. I paid a little more, $139, for the set but thats because I like the remanufactured process and the testing process. Also this is a set of 8, always nice to have a spare or two, especially when injectors are so small and not noticeable in a bag. But this is a 4-hole design on these

I haven't got to install them yet, but seemed like a good deal. When I received them they were packaged very nicely and came with o-rings, even have little plastic "cups" on the ends to protect the o-rings. I am always iffy on buying something so cheap off of ebay, like the $20 deals, so this seemed like a good choice.
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