Bosch D-Jetronic
James Thomas
jtvol at dcs-chico.com
Wed May 26 23:10:30 GMT 1999
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Thanks for the response. I have been in the business for 34 years and =
am thoroughly familiar with all the Bosch systems. Unfortunately I have =
never been able to get a schematic of the D-Jet control unit and this is =
what I am looking for. The ITB rules do not allow us to substitute =
alternate injection systems but your suggestion of a digital control =
unit is interesting. What information do you have regarding =
retrofitting a digital unit to the K-Jet system?
James
----- Original Message -----=20
From: James Montebello=20
To: diy_efi at efi332.eng.ohio-state.edu=20
Sent: Wednesday, May 26, 1999 10:20 AM
Subject: RE: Bosch D-Jetronic
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=20
info on D-Jet, at least as used by the Germans.
=20
Charles Pobst's book on Bosch injection systems also covers D-Jet in =
detail.=20
=20
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.=20
=20
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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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3D"Comic Sans MS">Thanks for the response. I have =
been in=20
the business for 34 years and am thoroughly familiar with all the Bosch=20
systems. Unfortunately I have never been able to get a schematic =
of the=20
D-Jet control unit and this is what I am looking for. The ITB =
rules do not=20
allow us to substitute alternate injection systems but your suggestion =
of a=20
digital control unit is interesting. What information do you have=20
regarding retrofitting a digital unit to the K-Jet system?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3D"Comic Sans MS">James</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A href=3D"mailto:jamesm at talarian.com" =
title=3Djamesm at talarian.com>James=20
Montebello</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
href=3D"mailto:diy_efi at efi332.eng.ohio-state.edu"=20
=
title=3Ddiy_efi at efi332.eng.ohio-state.edu>diy_efi at efi332.eng.ohio-state.e=
du</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, May 26, 1999 =
10:20=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: Bosch =
D-Jetronic</DIV>
<DIV><BR></DIV>
<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=20
the early '70s on</FONT></SPAN></DIV>
<DIV><SPAN class=3D738521617-26051999><FONT color=3D#0000ff =
face=3DArial=20
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=20
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=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D738521617-26051999><FONT color=3D#0000ff =
face=3DArial=20
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=20
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=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D738521617-26051999><FONT color=3D#0000ff =
face=3DArial=20
size=3D2>james montebello</FONT></SPAN></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #0000ff 2px solid; 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></BLOCKQUOTE></BODY></HTML>
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