Chips in a OBDII PCM?

[1project2many]

The Moates Roadrunner DIY kit is expensive but not out of control.

Black box Vortec instructions to modify for flashing without using OBDII were on gmecm years ago. Steve Ravet did some initial work with this.
http://www.diy-efi.org/gmecm/ecm_info/32bit/dumpflash/

I've been trying to tell people for years that OBDII is a step backward for tuning if you're only using the OBDII connection for programming. You lose all ability for real time emulating and changing the cal takes more time than burning and changing an eprom. The BDM flash is likely to be faster but Steve's instructions, like many from tech guys, make a lot of assumptions about knowledge and skill level of the user.

The ability to pull the chips out and make changes, however, means you will always have a way to modify your calibrations even if software to change through OBDII port is stopped. It's definitely worthwhile to work out a solution. Here's the first part of a hardware solution, a header which allows you to move the flash chip off the board:
http://www.moates.net/roadrunner-diy...on-header.html

Then you might be able to use a ribbon cable to move the connection point away from the board. Looks like at least one person on thirdgen is doing something similar. Luckily a 44 pin ribbon cable is fairly standard in the PC world so short pre-made cables are easy to locate:
http://www.cablesonline.com/44pinlapinri.html


Some good reading:
http://forum.efilive.com/showthread....-install-today
http://forum.efilive.com/showthread....t-installation
From here, there is a nice link to a page with pictures (because we all love pictures)
http://www.florida4x4.com/tech/rr-guts/

Of course, we're not looking to install the Roadrunner, only to install something such as a ZIF socket or ribbon cable. One approach might be to modify a GM memcal and install a ZIF or the proper flash chip on one end while leaving the other end unpopulated. Pin spacing would determine how difficult this is.

There are several tools available which appear to allow programming the PSOP44 44 pin flash device using a standard eprom programmer. They appear to be from China but maybe the cost is worth it:
http://www.dhgate.com/chip-programme...112a84964.html
http://www.oobdii.com/other-obd2-veh...-socket-psop44
Here's one for a Willems programmer:
http://tekdevice.com/chapter2/index....&product_id=55
Here's one that you complete:http://www.sivava.com/B09_Adapter.html

Of course, once you get this done it all begs the question of why can't you use your existing emulator? I'm sure some digging around might find those answers or enough clues to figure it out. Problems with timing, communications speed, and device storage capacity are all possibilities that come to mind. But one step at a time, of course.

HTH