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There is a slug of parameters that must be satisfied for the bike to go into closed loop mode. Two that I know for sure are:
Throttle position.
Head Temperature. (Too cold or too hot will prevent closed loop.)
I am sure there are other factors too.
When it isn't in closed loop mode the AFR is the result of the map. So, it is incorrect to say that when not in closed loop the bike will run significantly richer because some portions of the map may be nearly as lean as closed loop (close to 14.7:1).
Anyway, I realize that the 14.7:1 area is too lean for most people's liking, but regardless of what you do with A/C and exhaust, closed loop operation will result in an AFR of 14.7:1. Adding a voltage splitter will do nothing for the times the bike is in open loop mode. This is the area that your fuel maps will be too lean (as a result of adding the A/C and exhaust) and the bike cannot compensate for this condition.
If all you are doing is A/C and exhaust, I would recommend the download from the dealer.
Last edited by langner91 : 02-22-2008 at 08:06 PM.
Reason: Tried to make a little more sense for HDMD88's benefit.
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