speed density vs. mass air?
Junior User
Joined: Jun 2004
Posts: 57
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Not sure either, but I have a 95 with a 351 and it's speed density. I find that the only upgrade that will have a drivability issue would be an aggressive cam and or bigger injectors (maybe a dyno tune and custom chip would fix it). I'm running a powerdyne blower at around 6 psi @ 5000 rpms, Jacobs ignition, was running headers till a couple weeks ago (ball got crushed, leaked bad), K&N filter and no egr stuff. Truck runs great.
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Tuned
Joined: Jul 2003
Posts: 359
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From: ga
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Junior User
Joined: Jun 2004
Posts: 57
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If you need a computer or swap parts, I believe the lightening came with a mass-air 351, not sure which years, or what the differences would be.
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Lead Driver
Joined: Nov 2002
Posts: 9,558
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From: Concord, NC
Most (maybe all) of the MAF 351's are not a desirable swap from an electronics standpoint - in '96 F150's all engines were mass air, but were also OBD-II, which is a headache. If you are just getting mass air, a 5.0 (5.8 if they exist) mass air truck, '94 or '95 would be the best bet. A 302 mass air system will run the larger engine just fine.
Freshman User
Joined: Aug 2004
Posts: 43
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From: St Cloud/Orlando area, FL
Bronco's all were speed density. I believe that lightning was mass air. Ford racing caries a conversion kit that includes computer, harness, etc...When converting, the harness as well as computer needs to be changed due to different injector firing sequences. Good Luck.
Lead Driver
Joined: Nov 2002
Posts: 9,558
Likes: 45
From: Concord, NC
Very few '95 lightnings were mass air - very few and far between. The computer is changed not specifically for injector sequence, but because mass air requres a mass air computer - you can't just plug in a mass air meter and go with the stock computer.
Freshman User
Joined: Aug 2004
Posts: 43
Likes: 0
From: St Cloud/Orlando area, FL
Looks like your mass air conversion was a success by the pics in your albums. What type computer did you use/where did you get it? Also, did you buy the conversion kit harness or modify your existing harness?