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Old 11-10-2010, 01:14 PM
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5.0l Wiring Harness

Well it has come to the point in the build to wire the motor,

*The motor came from a 1986 Ford Mustang

I began by attempting to modify the stock wiring harness however for ease (and my sanity) I decided to look into using a swap harness and have come down to two options, one from RJM Injection and the other from Painless.

I was wondering if anyone had any experience with these kits and recommendations. Let me know thanks!

http://rjminjectiontech.com/?p=3

http://www.painlessperformance.com/w...rchField=60510

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Old 11-10-2010, 02:38 PM
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i have rewired my mustang 90 model from bumper to bumper while it was fuel injected and mass air.you going to run mass air? whats this harness going in? im new here so i dont know your project, some people take a mustang harness from pc up to do a 5.0 efi swap in older stangs.if this is the case,i bought my engine harness and computer off a mustang only website. dont ban me here as i havent read the rules yet but for mustang stuff u can get a total factory unabused harness cheap at corral.net
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Old 11-10-2010, 03:28 PM
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oh i didnt look at your links first, on 2nd thought,there is no way in heck id pay 500 bones for a wiring harness.u can get one for around 150 and get all the relays etc with it.
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Old 11-10-2010, 03:42 PM
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Fors racing also has stand alone harness and ecu for the 5.0 and my thoughts run along the line of cheaper is not always better. sometimes the saving in head scratching and frustration is worth the money spent..

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Old 11-10-2010, 03:58 PM
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im not sure what hes converting,your gonna need electric fuel pump and thats not in the front wiring harness.but yeah fast makes a kit too,pretty simple.plug n play.
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Old 11-11-2010, 11:11 AM
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Its going into a 1961 Ford Falcon Wagon, I already have a BBS electric fuel pump, but what I was going for is just the stuff I need to control the motor

I do have my factory harness but I had so many problems trying to get things to work, I thought maybe my time would be better served to just plug everything in...

As for the mass air I'm not quite sure what to do, I've heard both sides of the argument, however I feel that mass air would make things easier when it comes to having modifications done on the motor, where the speed density system would have to be programed (i think)
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Old 11-11-2010, 01:40 PM
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http://mustangsplus.com/tech/efi/index.html

if u are planning to mod it any bigger than a f cam,might aswell go mass air,tuning is alot easier.i have had a vortech v1 on my mustang and a kennebell 1.6 blower as well.and with speed density i dont think it would of ran right at all.this harness right here is mass air ready,will just need to pick up a mass air meter.http://www.fordracingparts.com/parts...tKeyField=9631 on a second thought though i dont know how wild you are going to go as far as power and tuning.if u are gonna do alot of mods with alot of tuning id look into getting a good computer with data logging options.im sure u got pages marked but here is a good site for the swap you are going to be doing.
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Old 11-11-2010, 10:20 PM
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Well my goal is to be in the 400hp range N/A, and maybe in time get crazy with some form of forced induction.

Any suggestions on what computer to get/stay away from, Ill be using the T-5 transmission that came from the 86 mustang, and I think I will go ahead and use a MAF setup...

and thank you for the link,
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Old 11-12-2010, 07:57 AM
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well 400 is a good number,but remember these 302's start spliting the block at 500hp a 351 is good to 750ish,the computer really depends on who u got local to do tuning.as far as a factory computer A9L there the ones for 5.0 mass air 5 speed. with it being na for a while id go with a A9l and get a sct chip burnt for it and u will be good. only thing u need to keep a eye on with forced induction is your a/f ratio.so be prepared to buy like a lm1 wideband. its a piggy back system that will run with your fac pc and u can tune with it and datalog if wanted.
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