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Old 11-03-2003, 18:34   #1 (permalink)
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speed density

i have a '94 Ford F-350 with the 7.5L(460ci)V8. I have heard that it has a speed density type fuel injection. how does this work and what are some positive or negative things about it? also, can it be upgraded at all? thanks for the help.

if it's fun it's probably illegal

my truck hauls like one of those big aussie road train things
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Old 11-03-2003, 19:33   #2 (permalink)
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Re: speed density

Speed density is great realistically a lot simpler than Mass-Air, but terribly inflexible. After you radically change/improve VE of the engine, the speed density system will tellyou to bugger off because the load/fuel mixture tables are chiseled in stone. They are buried in the processor, so when you exceed these parameters the system can no longer effectively compute injector pulsewidth "f/a ratio" and timing. The net result is loss of driveability. In extreme cases, engine failure due to detonation caused by lean mixtures and/or over-advanced timing.

You can burn a chip....if you have access to a chip burner and a dyno with A/F monitoring equipment, but do you want to reburned every time you make another mod or change to your system? Yes you can change the air/fuel/timing parameters in the speed density system, but the inherent inflexibility that is designed in to the system you can not get rid of.

You can do a Mass Air conversion. I know there are kits out there for that, but I do not have info on them for a 7.5L 460ci. I have seen them for other engines throughout the Ford lineup.
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Old 01-09-2004, 07:09   #3 (permalink)
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Re: speed density

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