Hello David, i have been following your journey of this remarkable DIY Design and love it!!! My compliments on the idea and understanding of how to trick the ECU! I have a question since i had a similar idea in mind. I’ve got a 2024 MT09 (Europe with 2 O2 Sensors). I want to put a straight pipe exhaust but i know a CEL will appear because the second O2 Sensor will throw up a fault code issue being no catalytic converter hence the same value will be sent from both O2 Sensors without no major difference. Would you propose this as a solution? Im thinking about leaving the primary O2 Sensor connected for proper AFR(o2 before catalytic converter) and remove the second o2 sensor (after catalytic converter) and mimic the values of an exhaust with cat using a microcontroller. I dont have any experience with this but since you’ve experimented a bit asking from your expertise. Would this work? Is it worth it to try or just nevermind about it! Can you help me in understanding in more depth about how to? Thanks in advance for having these videos!
I have previously pondered the situation you're in after someone posted on reddit that they tried installing ebay purchased o2 sensor deletes in place of both sensors and the engine was running very inconsistently as a result. The behaviour indicated how active the o2 sensor feedback loop is in self tuning the fuel maps. Many big name tuners claim it only matters at idle but this individuals experience proved that to be wrong. There are a lot of unknowns regarding what the ECU expects and what will cause the CEL with the gen4. Most of what I worked out came from the error codes in tthe service manual which for the gen3 I was able to download. Something like my design would allow for smaller variations to be programmed similar to what would be present with the stock exhaust but knowing what voltage level and how much variation will mean a lot of experimenting. Because we know that the ECU o2 sensor feed back loop uses the 2nd o2 sensor to tune the fuel map simply deleting it could cause problems. We wouldn't want it to be telling the ECU that everything is normal when in fact it's running lean. That would be bad. If I had to solve it for myself I would probably take the value from the first sensor or even the second sensor if it's still installed and halve the value from it. The value centers around 0.5v so if the sensor was outputting 0.8v I would change it to 0.65v or if it was outputting 0.2v then I would feed it 0.35v
I’m following your o2 sensor delete journey 😄 looking into this for my ‘24 mt09sp. But this goes a lot further then my knowledge will go about chips and programming them unfortunately. Are you gonna sell them? (I’m from the Netherlands)
You can buy them of ebay and aliexpress. I've got the electronics gear to DIY so I did, and I learned quite a bit along the way about what the ECU is looking for from the o2 sensor and the faults that the ECU will throw if it's not seeing what it wants to see.
For me with the gen3 it was mainly to allow me to remove the o2 sensor completely. With the decel fuel cut turned off and my ignition at the time being tuned to induce decel popping I didn't want the o2 sensor to get destroyed by all of the carbon build up. The damn things are expensive to replace if I ever want to put it back to stock. As for the gen 4 it seems that only Europe has the 2 sensor setup at the moment. Australia and the USA still only have the one sensor. The ecu for the gen4 is actively looking for a difference between the first sensor and the second so a delete for the gen4 would need to be carefully crafted and not just throw random values to the ECU. Someone tried the existing commercially available units it and posted on reddit about it. It was very educational.
Hello David, i have been following your journey of this remarkable DIY Design and love it!!! My compliments on the idea and understanding of how to trick the ECU!
I have a question since i had a similar idea in mind.
I’ve got a 2024 MT09 (Europe with 2 O2 Sensors).
I want to put a straight pipe exhaust but i know a CEL will appear because the second O2 Sensor will throw up a fault code issue being no catalytic converter hence the same value will be sent from both O2 Sensors without no major difference. Would you propose this as a solution? Im thinking about leaving the primary O2 Sensor connected for proper AFR(o2 before catalytic converter) and remove the second o2 sensor (after catalytic converter) and mimic the values of an exhaust with cat using a microcontroller. I dont have any experience with this but since you’ve experimented a bit asking from your expertise. Would this work? Is it worth it to try or just nevermind about it! Can you help me in understanding in more depth about how to? Thanks in advance for having these videos!
I have previously pondered the situation you're in after someone posted on reddit that they tried installing ebay purchased o2 sensor deletes in place of both sensors and the engine was running very inconsistently as a result. The behaviour indicated how active the o2 sensor feedback loop is in self tuning the fuel maps. Many big name tuners claim it only matters at idle but this individuals experience proved that to be wrong.
There are a lot of unknowns regarding what the ECU expects and what will cause the CEL with the gen4. Most of what I worked out came from the error codes in tthe service manual which for the gen3 I was able to download.
Something like my design would allow for smaller variations to be programmed similar to what would be present with the stock exhaust but knowing what voltage level and how much variation will mean a lot of experimenting. Because we know that the ECU o2 sensor feed back loop uses the 2nd o2 sensor to tune the fuel map simply deleting it could cause problems.
We wouldn't want it to be telling the ECU that everything is normal when in fact it's running lean. That would be bad.
If I had to solve it for myself I would probably take the value from the first sensor or even the second sensor if it's still installed and halve the value from it. The value centers around 0.5v so if the sensor was outputting 0.8v I would change it to 0.65v or if it was outputting 0.2v then I would feed it 0.35v
I’m following your o2 sensor delete journey 😄 looking into this for my ‘24 mt09sp. But this goes a lot further then my knowledge will go about chips and programming them unfortunately. Are you gonna sell them? (I’m from the Netherlands)
You can buy them of ebay and aliexpress. I've got the electronics gear to DIY so I did, and I learned quite a bit along the way about what the ECU is looking for from the o2 sensor and the faults that the ECU will throw if it's not seeing what it wants to see.
Hi great work.....whats your purpose to spoof the O2 sensors?? To run a gen3 exhaust??
I am going to pick up my MT09 next friday....
For me with the gen3 it was mainly to allow me to remove the o2 sensor completely. With the decel fuel cut turned off and my ignition at the time being tuned to induce decel popping I didn't want the o2 sensor to get destroyed by all of the carbon build up. The damn things are expensive to replace if I ever want to put it back to stock.
As for the gen 4 it seems that only Europe has the 2 sensor setup at the moment. Australia and the USA still only have the one sensor. The ecu for the gen4 is actively looking for a difference between the first sensor and the second so a delete for the gen4 would need to be carefully crafted and not just throw random values to the ECU. Someone tried the existing commercially available units it and posted on reddit about it. It was very educational.