At to Mt conversion ECU issue
04-23-2017, 03:40 PM
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At to Mt conversion ECU issue
Hi all, I bought a new 04 rx8 sport that had been converted to 5spd manual. I'd driven my friends 6spd and that uses half the fuel and still feels so much faster. My top speed is 165kph. I'm bogging out or misfiring at high rpm and smells very rich. I'm obviously new to rotaries but always done a bit of work on my own cars. ANYWAY, I have a manual ecu but the immobiliser won't let me start the car with the Mt ecu, even after I've changed the key. Can anybody please help me out? I have an error code for the communication to trans, another for the forward o2 sensor and one for the removed air pump if that helps
04-23-2017, 04:32 PM
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What information do you have about the actual swap? Based on your post I'm assuming you're running at 4 port motor, with the original ECU?
As far as the MT ECU, mazda will have to reprogram it to your vehicle. Whether or not they'd be willing to do that for an AT->MT conversion, I have no idea. Not to mention if you still have a 4 port motor, it will still probably run like crap, in a lot of the same ways it is currently as it will be tuned to utilize both the secondary injectors and the APV. I imagine you'd need a pretty comprehensive tune afterwards.
Back to your actual issue. You're most likely running pig rich because of the front O2 sensor. If the car can't communicate with it properly then it will dump fuel into the system to stay on the safe side while in closed loop mode. Which is where the car is 90% of the time while cruising. This is the first thing I would attempt to fix. What is the actual code that the car is throwing?
An N/A 6 port will always be a bit more powerful than a 4 port. Fixing the O2 sensor so that you're running with sane AFRs will probably help your power a bit in closed loop, but it should have no bearing whatsoever on open loop mode. Which kicks in when the engine goes above a certain RPM at a certain load.
Edit: Out of curiosity? Where did you find this? There was a 5-speed '04 on craigslist locally around here pretty recently.
As far as the MT ECU, mazda will have to reprogram it to your vehicle. Whether or not they'd be willing to do that for an AT->MT conversion, I have no idea. Not to mention if you still have a 4 port motor, it will still probably run like crap, in a lot of the same ways it is currently as it will be tuned to utilize both the secondary injectors and the APV. I imagine you'd need a pretty comprehensive tune afterwards.
Back to your actual issue. You're most likely running pig rich because of the front O2 sensor. If the car can't communicate with it properly then it will dump fuel into the system to stay on the safe side while in closed loop mode. Which is where the car is 90% of the time while cruising. This is the first thing I would attempt to fix. What is the actual code that the car is throwing?
An N/A 6 port will always be a bit more powerful than a 4 port. Fixing the O2 sensor so that you're running with sane AFRs will probably help your power a bit in closed loop, but it should have no bearing whatsoever on open loop mode. Which kicks in when the engine goes above a certain RPM at a certain load.
Edit: Out of curiosity? Where did you find this? There was a 5-speed '04 on craigslist locally around here pretty recently.