Dreamdemon
Well-Known Member
Different maps do not help, the problem is that the ECU runs closed loop in a certain rpm range that means it adjusts the fueling depending on the O2 sensor reading. While that works well with the O2 sensor plugged into the ECU it creates problems when you block the O2 sensor because you want to use the PCV and do not want that the ECU changes the fueling to compensate for the PCV adjustments. At high temperatures it works without flaws but fails at low temperatures. Somehow the ECU adds to much fuel when it is cold and that seems to be adjusted by the closed loop operation.
Autotune would be a possibility but that would mean that the pcv had to correct the fueling very much and autotune would have to run in closed mode all the time. I am still not sure how to set up autotune so it does what I want the description on the DJ website is not very helpful and thus I did not buy it.
In addition I realized that the bike is not running so well anymore (since adding the PCV) when at high altitude (8000 feet and more). This might be related to air pressure compensation of the ECU. I am not sure how to adapt the auto tune to use the air intake pressure and compensate for the altitude. Well in principle one could make a fueling cube depending on intake pressure, outside pressure and temperature but the PCV only allows a 2d map.
Again it should not be difficult to add another dimension but I am not sure that Dynojet will do this. Anyway it is a bit frustrating that there is no easy way to have an always nice tune just taking the PCV and autotune. It would help if Dynojet would describe in more detail the possible wiring and programming features on their website. Most information you have to find yourself but some (W-Beast and SoCalRider) did this and found their way to use it. I just have not enough time to try it myself, too busy riding .
Autotune would be a possibility but that would mean that the pcv had to correct the fueling very much and autotune would have to run in closed mode all the time. I am still not sure how to set up autotune so it does what I want the description on the DJ website is not very helpful and thus I did not buy it.
In addition I realized that the bike is not running so well anymore (since adding the PCV) when at high altitude (8000 feet and more). This might be related to air pressure compensation of the ECU. I am not sure how to adapt the auto tune to use the air intake pressure and compensate for the altitude. Well in principle one could make a fueling cube depending on intake pressure, outside pressure and temperature but the PCV only allows a 2d map.
Again it should not be difficult to add another dimension but I am not sure that Dynojet will do this. Anyway it is a bit frustrating that there is no easy way to have an always nice tune just taking the PCV and autotune. It would help if Dynojet would describe in more detail the possible wiring and programming features on their website. Most information you have to find yourself but some (W-Beast and SoCalRider) did this and found their way to use it. I just have not enough time to try it myself, too busy riding .