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 Post subject: DIGIPLEX 2S
PostPosted: Tue Apr 03, 2012 8:16 pm 
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Joined: Tue Jan 16, 2007 12:00 am
Posts: 114
Location: UK
model: 906 Paso
year: 1991
Hi All

Bought a new replacement DIGIPLEX 2S as a future spare, but is marked as MED 441A, on my bike unit is marked MED 442A, is there any difference? also where can I get a replacement cable boot, is it a Fiat part? :)

thanks Pete


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 Post subject: Re: DIGIPLEX 2S
PostPosted: Thu Apr 05, 2012 1:29 am 
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paso grand pooh-bah
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Joined: Sat Sep 03, 2005 12:00 am
Posts: 1323
Location: SF Bay Area
model: 750 Sport
year: 1990
I too have bought some as spares with both codes on them. I haven't tried them yet. I believe Guzzi also used them. Some fine day, I plan to swap out each one on my shelf and see if there is any power difference, or if it even runs. I know the one on my bike does not respond to vacuum changes any more, so I have blocked that off. So I am guessing I am missing out on a few degrees of advance at higher RPM.

Some day I will spring for a replacement box, but my Digiplex hasn't died yet.

Cheers,

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1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.


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 Post subject: Re: DIGIPLEX 2S
PostPosted: Thu Apr 05, 2012 7:29 am 
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Joined: Tue Jan 16, 2007 12:00 am
Posts: 114
Location: UK
model: 906 Paso
year: 1991
Got this reply from the dealer....interesting re mention of Guzzi engine?


Hi Peter, same unit different labeling, 442 was labeled for the Ducati and the 441 the Moto Guzzi at the same period
Regards Jim


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 Post subject: Re: DIGIPLEX 2S
PostPosted: Thu Apr 05, 2012 11:47 am 
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Joined: Thu Nov 29, 2007 2:38 am
Posts: 327
Location: UK
model: 907 I.E.
year: 1990
probably the difference relates to the mapping

inside there is an Eprom with the mapping records, but to swap the chips it will be difficult beacuse i recall them being soldered and covered in black resin.


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 Post subject: Re: DIGIPLEX 2S
PostPosted: Sat Apr 07, 2012 10:25 pm 
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paso grand pooh-bah
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Joined: Wed Dec 05, 2007 12:35 am
Posts: 1770
Location: Newzealand
model: 906 Paso
year: 1990
how about an med 439m digiplex 2 , there is one for sale here and if it fits .....

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 Post subject: Re: DIGIPLEX 2S
PostPosted: Mon Apr 09, 2012 9:35 am 
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paso grand pooh-bah
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Joined: Sun Aug 01, 2004 12:00 am
Posts: 1097
Location: siena, italy
model: 750 Paso
year: 1988
A friend of mine showed me differrent mapping for this unit (Fiat, Alfa Romeo, Ferrari, Guzzi, Ducati) and told me that it's easy to remap a new eprom, but it's hard to know wich one you need (8bit or 16 bit)

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 Post subject: Re: DIGIPLEX 2S
PostPosted: Sat Apr 14, 2012 8:18 pm 
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paso grand pooh-bah
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Joined: Sat Sep 03, 2005 12:00 am
Posts: 1323
Location: SF Bay Area
model: 750 Sport
year: 1990
One more question about the Digiplex 2S box.
Does the vacuum tube actually do anything? I would suspect that it advances the timing as it would on other vehicles. But, when I hook up a vacuum pump to it, nothing happens. I started the bike, and tried the vacuum at idle, no response. I tried it again at 2k and 3k. No change.
Could be my box is no longer functioning correctly, or the vacuum line to the intakes is just a ruse by Italian engineers.

Anybody confirm or deny that the vacuum line does anything?

Cheers,

_________________
Duc in the Bay
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.


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 Post subject: Re: DIGIPLEX 2S
PostPosted: Mon Apr 16, 2012 5:45 pm 
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paso grand pooh-bah
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Joined: Sun Aug 01, 2004 12:00 am
Posts: 1097
Location: siena, italy
model: 750 Paso
year: 1988
Actually I don't know how the vacuum works on 441a any differend model has spec mapping

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have a nice ride, Nicola

Black "DUKE" 751582
ex...Red "smooth" 753349 :-(


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 Post subject: Re: DIGIPLEX 2S
PostPosted: Mon Apr 16, 2012 7:14 pm 
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Joined: Sun Aug 30, 2009 3:12 pm
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Location: Italy
model: 750 Paso
year: 1987
http://www.ebay.com/itm/280864823697?it ... 23&vxp=mtr

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 Post subject: Re: DIGIPLEX 2S
PostPosted: Tue Apr 17, 2012 11:13 am 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3232
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
Image



The large black unit with 3 screws and the number 2 stamped on it is the vacuum
control unit for the spark advance. You can verify its function with a pump and timing light and 3 hands :thumbup:

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 Post subject: Re: DIGIPLEX 2S
PostPosted: Wed Apr 18, 2012 6:05 am 
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paso grand pooh-bah
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Joined: Sat Sep 03, 2005 12:00 am
Posts: 1323
Location: SF Bay Area
model: 750 Sport
year: 1990
I guess I'll open up my box and see what's inside. I assume that there is some form of diaphragm. I can't imagine a 20 year old diaphragm working so well anymore. May need to be upgraded.

Cheers,

_________________
Duc in the Bay
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.


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