Ref; 1999 R1100S
As you know there is some great info on how to properly sync TB's from guys like Bob Lentini and others. All of the info I've been able to find just tells you to open the air bypass screws a number of turns (somewhere between 1 to 3 turns is what I've seen) and start from there. But, and here's where I might be completely off base, my other ride is a 1988 Ducati Paso 750 and it is equipped with a Weber DCNF 44 (2 barrel carb). Getting a carb that's designed for a car on a bike is a real trick but that's not my point. Aside from the air/fuel mixture screws there are two air bypass screws, one for each barrel. The idea on the carb is to only adjust one so that the airflow equals the other barrel. Thus my question for the TB's on the R1100S.
I've been thinking about better low end throttle response. Has anyone ever started the sync process (assuming the TPS is properly set) by completely closing the air bypass screws, properly setting the idle RPM's / sync on both TB's by adjusting the throttle cables at the butterflies and then using the air bypass screws for fine adjustments?
If I understand the fuel injection system properly, it will automatically compensate for mixture. Doesn't opening the air bypass screws a substantial amount create an enhanced possibility for an overly lean mixture? It would seem to me if you wanted a more accurate injection mixture then you wouldn't want to introduce extraneous airflow. Especially that far downstream where the only sensor that can compensate for it is in the catalytic?