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  1. OPMACHINE

    RamJet 350 MEFI3

    following up, I found a simple solution for my MEFI 3 ECU. I send my ECU off to OBD Diagnostics - https://obd2allinone.com/ramjettuning.asp they are able to crack the GM Code and recalibrate/program the Stock ECU to lean out the air/fuel mixture and give it a little performance tune. My eyes...
  2. OPMACHINE

    RamJet 350 MEFI3

    Thank you everybody for you input! I would still like to find a MEFI4 ECU and harness, hard to swallow the fact that these were available a few months ago. For now, phase#1 is to remake the 2.5'' SS exhaust with a provision for O2 sensor and catalytic converter. This will be my first exhaust...
  3. OPMACHINE

    RamJet 350 MEFI3

    Looks like the RamJet 350 and 502 have different ECM. I am going to keep looking for a full MEFI4 Conversion kit p/n: 12499116. For now anyways. One on Ebay that is missing the computer. Chevrolet Performance 12499116 -Fuel Injection System WIRING HARNESS | eBay -...
  4. OPMACHINE

    RamJet 350 MEFI3

    From the research that I have done, the RamJet 350 computer cannot be tuned or programmed. the MEFI3 setup is essentially a boat motor with no intake air or co2 sensors, no cats or any smog control. The open loop system runs very rich at idle and will literally make your eyes water. I am...
  5. OPMACHINE

    RamJet 350 MEFI3

    Ladies, I am looking for some advice on ways to reduce the eye watering fumes that are coming form the tailpipe of my RamJet 350 MEFI3. This engine runs off an open loop system and is known to run rich. The later MEFI4 open/closed loop wiring harness addresses this issue to a certain existent...
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