[Diy_efi] Announcement: Honda-oriented ECM/EFI site

[Programmer]

Great info there...did you guys set up a download site with differing engine
calibrations ?

This is good timing, didn't know you guys existed.

Lyndon

----- Original Message -----
From: <daveb at codyscafe.com>
To: <diy-efi at diy-efi.org>
Sent: Friday, July 19, 2002 11:43 AM
Subject: [Diy_efi] Announcement: Honda-oriented ECM/EFI site


> The DIY-EFI list and its archives are an incredible resource.  I wish I
had
> found them earlier.
>
> I am sending this message to spread awareness of a http://pgmfi.crx-
> forum.org, a site that is currently devoted to exploring the hardware and
> software used in honda ECUs.
>
> My eventual goal is through "dirty room" techniques (read: reverse
> engineering) be able to gather enough data on how the core microcontroller
> interfaces with support ICs responsible for ignition timing, fuel injector
> control and sensor monitoring to be able to write a "clean room" open
> source program for most honda engines that is tunable, supports boost and
> external solenoid control (N2O, Vtec) WITHOUT USING ANY HONDA CODE and
most
> of all is open source. :)
>
> I've noticed sporadic discussion of honda-related ECUs and management on
> the list archives, and wanted to try to share what we are doing with a
> broader audience.
>
> The current status of the project is mixed, and can be said to be in its
> infancy overall.
>
> The 84-91 OBD0 ECUs in hondas use 99% intel 8052 compatible micros from
Oki
> semiconductor.  Much progress has been made understanding these, but it
> would be unfair to say anything other than full fuel/spark adjustment of
> stock ECUs is possible now.  Several strategies for implementing larger
> fuel/ign tables for boost have been tried unsuccessfully.  Several
> approaches to datalogging are currently being tested.
>
> The 92-95 OBD1 ECUs and a limited number of 88-91 ECUs use the Oki 66X301
> or 66X207 MCU, which use a proprietary core and have no freely available
> disassembler or assembler tools.  I am currently in process of porting
GAS,
> the GNU assembler, to the platform, using the M68HC11 port of GAS as a
> reference.  Needless to say, without code tools progress has been slow.
> I'm not a good enough programemr to be able to make rapid progress, and no
> one else has really volunteered to help writing ASM/DASMs.
>
> The 96+ OBD2 ECUs continue to use the Oki 66K series, substituting the oki
> 665xx series and becoming increasingly integrated.  There is limited
> discussion of program changes on these computers but most information
> remains unknown.
>
> Hardware-wise, more progress is being made.  Comparison of ECUs from
> various models with varying features (DPFI vs MPFI, heated O2 sensors vs
> non-heated, Vtec activation vs. single cam profile, knock sensor vs knock-
> less, shift light vs shift-light-less, etc.) is starting to provide much
> insight into which parts of the boards are responsible for which secondary
> functions.  It appears that honda/deshinken use a very limited number of
> boards and then leave components off when features are not used.
>
> Additionally, if the forum format appeals to the non-honda related DIY-EFI
> contingent, I would be more than willing to host a www discussion board
for
> more general EFI topics.
>
> Hope to see some of the great minds from this site wander by soon!
> peace
> -Dave
>
>
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> Diy_efi at diy-efi.org
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