Vanos - BMW's variable intake / exhaust timing system.
My engine uses Single vanos, which only advances the intake cam.
From here: http://www.bmwworld.com/technology/vanos.htm
Just off idle, the DME energizes a solenoid which allows oil pressure to move that cup gear to advance the cam 12.5 degrees at midrange, and then at about 5000 rpm, it allows it to come back to the original position.
To impliment in VEMS, we need to have an RPM based off-on-off.
From my understanding, currently the firmware can only handle an off-on situation.
Dual vanos changes both of the exhaust and intake cam timing, and is variable throughout the range (not on/off like single vanos). This would require a much more complex PWM system to control.
I would like to look into firmware changes to handle the single vanos configuration (either myself or with some guidance)