I just installed the Fat Duc O2 manipulator on my 2008 GT1000 last night. It has a Euro ECU and standard exhaust, a stock bike for Singapore. I felt like I was riding a different bike to work today. Here in Singapore stop and go driving is a way of life during the daily commute. I have really been suffering with the chattering and chugging of my GT1000 in low speed manuvering. The transformation brought about by the Fat Duc is truly amazing. Even more amazing when you consider it costs only US$80 and a mechanical idiot like me could install it in about two minutes.
Under 2000 RPM running in 1st, 2nd and 3rd is almost smooth and regular. Also on the freeway I could never cruise in 6th below 4000 RPM(120 km/hr) or below 3500 RPM in 5th (90 km/hr) without feeling like I was chugging the engine to death. Now I actually have a smooth power band from 2800 RPM up in 5th and 3500 RPM up in 6th.
All I did was install the Fat Duc with the default setting between 13.5 and 13.2 air to fuel ratio and I got these results. My question is: can I improve my results by further tuning of the ratio? How will I know if I have made it too rich? I guess if I make it too lean I will go back to the perfomance I had before I installed it. But is there somewhere between the default setting and no enrichemnt that is better? I have seen many threads on the Fat Duc but I have not been able to find one that gives a tuning procedure for mechanically challenged guys like me.