roger 04 rt
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Part 4 of 4
R1200GSA Fully Adapted Demonstration Ride
On his way home from HelnBack, after about 20-30 hours of riding, Terry logged his AFRs for several hours. Below is about 1 1/2 minutes of one of the segments so you can see the degree to which the BMSK has adapted the AFRs of his two cylinders to be equal. They are nearly carbon copies of one another. I continue to be amazed by how well the BMSK manages the motorcycle.
While the chart pretty much speaks for itself, here are some notes:
--The tall peaks are Overrun Fuel Cutoff during deceleration. Note how well and how quickly the BMSK gets the engine back to its target AFR--13.65:1 in Terry's case using the LC-1s.
--The acceleration AFR dips which varied prior to adaptation in the post 2 of this series are very uniform. Even during acclereation, the AFRs track. The richest mixtures are about 11.8:1 (richer than a stock bike because of Adaptation to his 13.65 Closed Loop target).
--About the leanest the BMSK puts the mixture is about 15:1 during normal deceleration (in other words, not Overrun Cutoff). This would approach 16:1 on a stock bike as its target Closed Loop would be leaner. Also keep in mind that nowhere in the hours of logs Terry sent was there a leaner than target fueling during cruise or acceleration. If during Dyno runs, you see grossly lean AFRs recorded it is most likely due to the Dyno's Wideband AFR gauge in the tailpipe.
So that's it, probably too much detail but I hope that we all know more about how the BMW ECUs work. A big thank you from me to Terry for accumulating this data. Nice work!
RB
R1200GSA Fully Adapted Demonstration Ride
On his way home from HelnBack, after about 20-30 hours of riding, Terry logged his AFRs for several hours. Below is about 1 1/2 minutes of one of the segments so you can see the degree to which the BMSK has adapted the AFRs of his two cylinders to be equal. They are nearly carbon copies of one another. I continue to be amazed by how well the BMSK manages the motorcycle.
While the chart pretty much speaks for itself, here are some notes:
--The tall peaks are Overrun Fuel Cutoff during deceleration. Note how well and how quickly the BMSK gets the engine back to its target AFR--13.65:1 in Terry's case using the LC-1s.
--The acceleration AFR dips which varied prior to adaptation in the post 2 of this series are very uniform. Even during acclereation, the AFRs track. The richest mixtures are about 11.8:1 (richer than a stock bike because of Adaptation to his 13.65 Closed Loop target).
--About the leanest the BMSK puts the mixture is about 15:1 during normal deceleration (in other words, not Overrun Cutoff). This would approach 16:1 on a stock bike as its target Closed Loop would be leaner. Also keep in mind that nowhere in the hours of logs Terry sent was there a leaner than target fueling during cruise or acceleration. If during Dyno runs, you see grossly lean AFRs recorded it is most likely due to the Dyno's Wideband AFR gauge in the tailpipe.
So that's it, probably too much detail but I hope that we all know more about how the BMW ECUs work. A big thank you from me to Terry for accumulating this data. Nice work!
RB