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Yes, you can run a hybrid speed density mode and you can use MAF on the lower or upper end of the scale. Most often you would tune a hybrid speed density as you describe, using MAF for the lower end and SD for the high end, usually because you are maxing out the MAF sensor.
You can use any combination or any one of MAF, MAP, and RPM to define the switch to SD from MAF. An example would be to use MAF all the way up to close to max MAFv, then switch over to SD from there. You can define the exact breakpoint in the software.
I don't have any example maps, but as long as your MAF and VE maps are dialed in tight, the switchover from MAF to SD is very smooth, seamless I'd say. You can spend a little time at the switchover point to really make it smooth. Fueling would continue just as if it were still running on MAF if tuned correctly.
- Bob
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