What are the differences between PCM's? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 24 (permalink) Old 10-29-2008, 09:00 PM Thread Starter
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What are the differences between PCM's?

I've seen a few posts talking about upgrading to certain pcm formats, and it seems like the biggest advantage for the newer types is that they allow for more adjustability with transmission parameters.
Care to explain more about what all of the benefits are, or point me to a thread that does? Also, does this only work with superduty trucks or can certain models work with OBS trucks too? I am guessing OBS trucks are much more limited because they have much fewer sensors to read off of.
Thanks,
Carl

Carl Evers
1996 Centurion conversion- Casserly 250cc BD's, Terminator HPOS, ITP Reg. return, ATS A5000 w/ early 99 intercooler, ATS Propane system and stage IV transmission with 5star and billet flexplate, DP Tuned
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post #2 of 24 (permalink) Old 10-29-2008, 09:39 PM
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Re: What are the differences between PCM's?

I can give you compatibility between PCM codes as far as hardware is concerned (DPC-422 etc), but I am unsure if you can use a SD pcm in a OBS without changing some pins around in the connector.... also the E4OD may need some pressure adjustments made in tuning if you want to use a SD pcm in an OBS...

Matt Robinson
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post #3 of 24 (permalink) Old 10-29-2008, 09:43 PM
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Re: What are the differences between PCM's?

What about my 03 7.3 what would happen if I had my chip programmed for PMT1? I know that PMT has better tuning for the trans.

2003 F-250 4x4 7.3 liter PSD EXT. cab SB. Wilson 2000 antenna, Uniden PC78 peaked and tuned with a connex 250 Linear Amp.
MODS: BTS Tranny, DIY Tymar, Hypermax 3.5 DP to 5" back, TW tunes, DI's GT38R BB turbo, autometer boost, pyro, trans, water temp a Scangauge and Firestone rear air bags.
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post #4 of 24 (permalink) Old 10-29-2008, 09:47 PM
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Re: What are the differences between PCM's?

the talk of a PCM swap is for the early 99..they have a smaller turbo, HPOP and injectors..most of us will upgrade the PCM when we up grade the other parts..the DPC-422 PCM will make the truck run better stock and it is more friendly to tune then XLE PCM's found in the early 99..they also have a much better trans shifts

Early 99 7.3 F350 auto,TN T-4 mount with a s467 for air,H-11's stud's SRP 1.1 for oil all supplied by unlimited diesel..beehives, DI push rod's, new alliant 315/200 hybrids,Driven diesel fuel system with a fuel lab 41401. ...tuned by Gearhead..
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post #5 of 24 (permalink) Old 10-29-2008, 09:47 PM
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Re: What are the differences between PCM's?

unfortunately pmt1 on a chip won't run an 02-03 tach, trans temp gauge, AC, or glow plug controller.....

Matt Robinson
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post #6 of 24 (permalink) Old 10-29-2008, 09:58 PM
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Re: What are the differences between PCM's?

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What about my 03 7.3 what would happen if I had my chip programmed for PMT1? I know that PMT has better tuning for the trans.
Quote:
unfortunately pmt1 on a chip won't run an 02-03 tach, trans temp gauge, AC, or glow plug controller.....
Matt is correct. A PMT1 PCM will not work in an 02-03 PSD.

I tried PMT1 shifting in my truck. It was not done with a PCM swap. Instead it was part of the programming on the chip itself. Jody at DP-Tuner "prefers" the PMT1 shifting, and I had him at one time set my tunes up to emulate that type of shifting. Unfortunately, I didn't like it at high altitude, so he took it off.

With your DI chip, I'm not sure what type of shifting David emulates with his tuning. You could call and ask him. I'm sure he can set it up to do whatever you want. So if it's just the shifting aspect you are looking for, then that can be changed with the tuning. You don't have to swap PCM's for that.

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post #7 of 24 (permalink) Old 10-29-2008, 10:08 PM
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Re: What are the differences between PCM's?

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So if it's just the shifting aspect you are looking for, then that can be changed with the tuning. You don't have to swap PCM's for that.
Oofduh...I was way off. Nevermind.

Cody
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post #8 of 24 (permalink) Old 10-29-2008, 10:27 PM
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Re: What are the differences between PCM's?

I know when I had DP tunes on my chip the 80e mode and the 40 mode would shift like PMT1 is said to. It would lock the converter going from 1st into 2nd gear.

2003 F-250 4x4 7.3 liter PSD EXT. cab SB. Wilson 2000 antenna, Uniden PC78 peaked and tuned with a connex 250 Linear Amp.
MODS: BTS Tranny, DIY Tymar, Hypermax 3.5 DP to 5" back, TW tunes, DI's GT38R BB turbo, autometer boost, pyro, trans, water temp a Scangauge and Firestone rear air bags.
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post #9 of 24 (permalink) Old 10-29-2008, 10:42 PM
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Re: What are the differences between PCM's?

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Originally Posted by MILFORD View Post
I know when I had DP tunes on my chip the 80e mode and the 40 mode would shift like PMT1 is said to. It would lock the converter going from 1st into 2nd gear.

I just put in a PMT 1 PCM in my early 99..Jody has my chip..tuning for stage 2's i Told Jody I also have Brian at BTS set up my VB for early tc lock up, ,what you described is just what I'm hoping for..

Early 99 7.3 F350 auto,TN T-4 mount with a s467 for air,H-11's stud's SRP 1.1 for oil all supplied by unlimited diesel..beehives, DI push rod's, new alliant 315/200 hybrids,Driven diesel fuel system with a fuel lab 41401. ...tuned by Gearhead..
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post #10 of 24 (permalink) Old 10-29-2008, 10:57 PM Thread Starter
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Re: What are the differences between PCM's?

So basically it would not be worth trying to adapt a SD PCM into an OBS because the main benefit (shifting strategy and TC lockup) can be achieved with good tuning on any PCM, correct?

Carl Evers
1996 Centurion conversion- Casserly 250cc BD's, Terminator HPOS, ITP Reg. return, ATS A5000 w/ early 99 intercooler, ATS Propane system and stage IV transmission with 5star and billet flexplate, DP Tuned
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