Homebrew EFI box

[Bruce Plecan]

-----Original Message-----
From: Alex Samson <asamson at orausa.com>
To: DIY_EFI at efi332.eng.ohio-state.edu <DIY_EFI at efi332.eng.ohio-state.edu>
Date: Wednesday, August 26, 1998 9:57 PM
Subject: Homebrew EFI box


Hi Alex, glad your here, do tell, yadda yadda yadda.  I really snipped
your post for the following guestions


>I made was based on an 80C31 for the EFI, another 80C31 for the
>distributorless ignition system, and a PIC for the idle stabilizer.

PIC for idle stabilizer, do tell.

 Man this was a wild project for about 6 months! I did a lot of guessing
because we never had access to a Subaru with the same engine. I had 8k bytes
of scratchpad RAM to log sensor readings to help in developing the software
written in assembler. At present, the van has done over 30K
>miles already and I havent made any more changes the last 2 years.  Its
>a daily driver owned by a shop mechanic who simply loves the novelty of
>his engine setup.   Exhaust has the usual stuff and an O2 sensor which
>the box reads for mixture control.  Softwares and look-up tables for the
>80C31's are stored in individual SRAMs with  a small backup battery to
>allow easy upgrade downloading from a laptop. Naturally, a default setup
>is in Eprom.

Where would one find out more about a "SRAM".

>I have started a new project, this time for an old Bosch D-jetronic in a
>73 Mercedes 450SLC.  This one is for myself.

Ahh, 450's, onena my favorite rides.  Makes interstates take on a
new meaning.


 I picked up the box (and connectors) and
>ran it in my bench simulator back home (for which I needed the connector
>for in the first place).

OK, what how why where, on the engine simulator.  Just rpm/vss?,
programmable?.  Just curious how your doing it, I'm still at breadboarding
mine.

>I can go on and on with this subject but I would first like to get
>feedback from the members of the list if my topics are appropriate.
>
>regards to all,
>alex samson
>
Cheers
Bruce