Hacking pre-obd car for fun and horsepower
summary
1987 Honda Civic with no OBD uses an early PGM-FI read-only ROM, so the plan is ECU chipping and swapping in a programmable dump to run E85 conversion maps. Workflows include dumping with a miniPro/GEL-866 programmer, reading serial via FTDI, concatenating split 64k ROM images, and UV-erasing mask ROM (currently ~20% cleared using a UV toy). Progress: maps validated by a tuner and partially flashed but initial flash wrote the wrong half so the engine won’t start yet; awaiting correct flash to finish.
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chapters (8)
- 0:00Project introduction
- 2:21Benefits of E85 fuel
- 4:51OBD and diagnostic systems
- 6:58Reverse engineering firmware
- 10:30ECU chipping process
- 15:43Data mapping challenges
- 21:50Troubleshooting and UV erasing
- 26:01Final discussion and Q&A
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