F250 pcm vs F550 pcm ? - Ford Powerstroke Diesel Forum
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  #1  
Old 02-18-2012, 07:15 PM
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F250 pcm vs F550 pcm ?

Is there any advantage or disadvantage to installing a 2000 F550 manual trans PCM in a 2000 manual trans F250 ?
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Old 02-22-2012, 03:30 AM
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bump..................
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Old 02-22-2012, 01:54 PM
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I cant see how it would make any difference at all. A 550 is essentially the same thing as a 250 other than the suspension and axles.
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Old 02-22-2012, 05:14 PM
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There are 2 different codes a dac3 for the 250 and vxy3 for the 550. My thought would be that the 550 would be tuned for pulling a larger load , like a tow tune. I would be using my DP F5 chip, so I think that would give me the tunes and the PCM would run the essential systems like timing etc.
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Old 02-22-2012, 05:16 PM
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I know in the newer motors the bigger trucks had de-tuned strategies to help protect the motor in the HEAVY load situations. But since you're gonna tune it anyway, that wouldn't matter.
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Old 02-22-2012, 05:22 PM
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If your already tuning it, then a different PCM isn't going to change anything. You'll just have to re-tune your DP to accommodate the new PCM. The 550 PCM, if anything, is de-tuned to last longer under heavier loads. Look at a 2012 Powerstroke. The 450/550's are de-tuned for this same reason.
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Old 02-22-2012, 05:37 PM
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I need a new PCM ,so if i don't get a DAC3, then I'll need to get my DP chip reburned.
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Old 02-22-2012, 07:20 PM
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F550's are not obd2 compliant. and will not pass the emissions in some states if you install it in a 250. and most small shops will not be able to access the info with a standard diagnostic scanner. we run several 550's and 10 plus 350's @ work. our in house mechanics cannot properly diagnose the driveability issues on the 450's or 550's they go to ford. which sucks cus a simple problem takes my truck down for at least a week.
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Old 02-22-2012, 08:14 PM
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Why can't they diagnose? 7.3s aren't OBD compliant either. CAN system.
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