Bosch D-Jetronic
James Montebello
jamesm at talarian.com
Wed May 26 17:21:33 GMT 1999
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You might consult with VW and Porsche types. D-Jet was used extensively in
the early '70s on
a number of VW models, and the Porsche 914. There are some 914 web sites
that offer detailed
info on D-Jet, at least as used by the Germans.
Charles Pobst's book on Bosch injection systems also covers D-Jet in detail.
My take on this is that you'd be better off replacing the OEM analog ECU
with a digital version that
you could remap at will.
james montebello
-----Original Message-----
From: owner-diy_efi at esl.eng.ohio-state.edu
[mailto:owner-diy_efi at esl.eng.ohio-state.edu]On Behalf Of James Thomas
Sent: Tuesday, May 25, 1999 6:05 PM
To: DIY_EFI at efi332.eng.ohio-state.edu
Subject: Bosch D-Jetronic
Here is a good one for you guys. I own a Volvo Specialty Service in
California. I am 50 years old and an old SCCA racer (used to race in
E-Production in a '58 Porsche Speedster in the 1970's). I am completing a
new project for SCCA racing, a 1971 Volvo 142 to compete in ITB. Pretty
much got all the tricks down. This car is brand new from the ground up
(every nut, bolt and molecule). Got all the latest trick ideas from my
other Volvo ITB racers that I have been helping for the last few years. I
am planning this one to be a world beater ( if I can still drive ). Here is
the question...I am having a problem finding a schematic of the D-Jetronic
control unit (MPC) so I can adjust the fuel mixture in different ranges. I
don't want to mess with the head temp sensor resistance as it seems to mess
up the injection timing, got to work on the inside. Haven't gotten much from
Bosch. Need some engineering brains who might have some thoughts on
modifying the innards of this unit.
Any thoughts out there?
James Thomas
James Thomas Independent Volvo Service
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<DIV> </DIV>
<DIV><SPAN class=3D738521617-26051999><FONT color=3D#0000ff face=3DArial =
size=3D2>You=20
might consult with VW and Porsche types. D-Jet was used =
extensively in the=20
early '70s on</FONT></SPAN></DIV>
<DIV><SPAN class=3D738521617-26051999><FONT color=3D#0000ff face=3DArial =
size=3D2></FONT></SPAN><SPAN class=3D738521617-26051999><FONT =
color=3D#0000ff=20
face=3DArial size=3D2>a number of VW models, and the Porsche 914. =
There are=20
some 914 web sites that offer detailed </FONT></SPAN></DIV>
<DIV><SPAN class=3D738521617-26051999><FONT color=3D#0000ff face=3DArial =
size=3D2></FONT></SPAN><SPAN class=3D738521617-26051999><FONT =
color=3D#0000ff=20
face=3DArial size=3D2>info on D-Jet, at least as used by the=20
Germans.</FONT></SPAN></DIV>
<DIV><SPAN class=3D738521617-26051999><FONT color=3D#0000ff face=3DArial =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D738521617-26051999><FONT color=3D#0000ff face=3DArial =
size=3D2>Charles Pobst's book on Bosch injection systems also covers =
D-Jet in=20
detail. </FONT></SPAN></DIV>
<DIV><SPAN class=3D738521617-26051999><FONT color=3D#0000ff face=3DArial =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D738521617-26051999><FONT color=3D#0000ff face=3DArial =
size=3D2>My=20
take on this is that you'd be better off replacing the OEM analog ECU =
with a=20
digital version that</FONT></SPAN></DIV>
<DIV><SPAN class=3D738521617-26051999><FONT color=3D#0000ff face=3DArial =
size=3D2>you=20
could remap at will. </FONT></SPAN></DIV>
<DIV><SPAN class=3D738521617-26051999><FONT color=3D#0000ff face=3DArial =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D738521617-26051999><FONT color=3D#0000ff face=3DArial =
size=3D2>james=20
montebello</FONT></SPAN></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #0000ff solid 2px; MARGIN-LEFT: 5px; PADDING-LEFT: =
5px">
<DIV class=3DOutlookMessageHeader><FONT face=3D"Times New Roman"=20
size=3D2>-----Original Message-----<BR><B>From:</B>=20
owner-diy_efi at esl.eng.ohio-state.edu=20
[mailto:owner-diy_efi at esl.eng.ohio-state.edu]<B>On Behalf Of</B> =
James=20
Thomas<BR><B>Sent:</B> Tuesday, May 25, 1999 6:05 PM<BR><B>To:</B>=20
DIY_EFI at efi332.eng.ohio-state.edu<BR><B>Subject:</B> Bosch=20
D-Jetronic<BR><BR></FONT></DIV>
<DIV><FONT face=3D"Comic Sans MS">Here is a good one for you =
guys. I own=20
a Volvo Specialty Service in California. I am 50 years old and =
an old=20
SCCA racer (used to race in E-Production in a '58 Porsche Speedster =
in the=20
1970's). I am completing a new project for SCCA racing, a 1971 =
Volvo=20
142 to compete in ITB. Pretty much got all the tricks =
down. This=20
car is brand new from the ground up (every nut, bolt and =
molecule). =20
Got all the latest trick ideas from my other Volvo ITB racers =
that I=20
have been helping for the last few years. I am planning this =
one to be=20
a world beater ( if I can still drive ). Here is the =
question...I am=20
having a problem finding a schematic of the D-Jetronic control =
unit=20
(MPC) so I can adjust the fuel mixture in different =
ranges. I=20
don't want to mess with the head temp sensor resistance as it =
seems to=20
mess up the injection timing, got to work on the inside. Haven't =
gotten much=20
from Bosch. Need some engineering brains who might have some =
thoughts=20
on modifying the innards of this unit.</FONT></DIV>
<DIV><FONT face=3D"Comic Sans MS">Any thoughts out =
there?</FONT></DIV>
<DIV><FONT face=3D"Comic Sans MS">James Thomas</FONT></DIV>
<DIV><FONT face=3D"Comic Sans MS">James Thomas Independent Volvo=20
Service</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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