Volkswagen Digifant Injection

[Kevin Timmerman]

------ =_NextPart_000_01BC3EBB.E6526FE0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

The G60 uses MAP.  The idle and FT limits are wired in parallel, RPM is =
used to determine witch limit is actuated.  Knock sensing and OXS are =
used.  The pot with the temp sensor is used for what VW calls CO =
adjustment, not sure exactly how it all works.  The ISV (idle stabilizer =
valve) is used for boost limiting.  Popular mods put a pressure switch =
in series with the ISV to increase the limit or reroute the pluming for =
no limit.  Putting a pressure switch in series also prohibits the ISV =
from stabilizing the idle.  This can be a problem in cold climates, OK =
for summer use.  Rerouting the plumbing allows normal operation at idle =
and is not a problem at WOT because, unlike a turbo,  the boost is =
primarily limited by the RPM of the G-60 SC.

Running without boost does not require chip changes.  I ran my G-60 for =
a week without boost.  I made some "changes" and blew up some pluming =
between the G-60 and intercooler.  You will loose about 100hp because of =
the low compression.  Very slow, but runs fine.  Why do you want to do =
this??

I have disassembled code in the digifant ECU.  Tables have been =
identified, but I have not had time to comment any of the code. I can =
email this to you if you are interested (185K).  The CPU is a motorola =
68HC11.  Completely different design than the Golf/Jetta digifant (8051 =
???).

A corrado mailing list exist with about 600 members.  Look at =
www.corrado-club.com for more info.


-----Original Message-----
From:	Epjetta at aol.com [SMTP:Epjetta at aol.com]
Sent:	Tuesday, April 01, 1997 1:35 AM
To:	diy_efi at coulomb.eng.ohio-state.edu
Subject:	Volkswagen Digifant Injection=20

This is the first time I have posted to this group and I have a OEM fuel
injection
modification question. The system in question is the VW Digifant as used =
in
the Corrado G60(the factory supercharged version). From what I can =
determine,
it use's a map sensor, and some sort of air tempeture sensor with a
potentiometer ( to adjust a/f ratio) in the boost tube to the throttle =
body.
It also use's two switches to tell the ECU that the throttle is
closed/open/full throttle.
If I'm not mistaken, the ECU also use's the idle control valve to bleed =
off
excess boost pressure at full throttle if it exceeds a certain level. =
The ECU
also controls timing with knock sensor control.=20

Now my question is, can I use this system with out the boost? I know =
I'll
have to reprogram the ECU for non-boost condition's, but is that all? I =
just
subscribed to this group and am not sure how much VW or Bosch experiance
there is floating around in here. If more information is needed, I can
probably obtain it(but not on the web.for some reason there is a lack of =
info
on this system)

Any help would be greatly appreciated.

Marty Atcher
epjetta at aol.com

------ =_NextPart_000_01BC3EBB.E6526FE0
Content-Type: application/ms-tnef
Content-Transfer-Encoding: base64
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------ =_NextPart_000_01BC3EBB.E6526FE0--