Bosch D-Jetronic

[James Thomas]

Thanks for the response.
I really need to get a map of the internals of the ECU.   See what you can
find.
Thanks,
James
----- Original Message -----
From: Stowe, Ted-SEA <StowT at PerkinsCoie.com>
To: <diy_efi at efi332.eng.ohio-state.edu>
Sent: Tuesday, May 25, 1999 10:14 PM
Subject: RE: Bosch D-Jetronic


> I had a d-jet on my 914's , I used to time trail one at sears point. there
> is one outside in my 72 Saab 99.
>
> I eventually built a 8051 replacement, but the original system was quite
> capable, I've heard stories of guys putting roll bars in 914's and
drilling
> into and through the ECU and the car still ran, makes you wonder.
>
> I have never seen a complete schematic, however there was a subset of
d-jet
> ECU's that had a mixture adjustment control on the ECU, also I have found
> that old temp sensors generally didn't work, also the points used in the
> distributor should be checked out. I used to disconnect the inlet temp
> sensor, (not the head temp sensor), this tricked the ECU into running
rich.
> also another trick was to drill out the plug in the external map sensor so
> you could adjust that. a long time ago I vaguely remember seeing some
> schematic details in one of my Porsche club archive books, I'll check and
> see if I still have it. I wish I still had that 914 too.
>
> Ted Stowe
>
>
> -----Original Message-----
> From: James Thomas [mailto:jtvol at dcs-chico.com]
> 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
>