Joined: Jan 2011
I Ride: 2000 ZX7/9R, 2010 CBR1000RR, 2005 KX250F
DING DING DING
I actually got in an argument with some guy on the ZX7R Facebook page over that thing. I left the group shortly after because I realized most of the guys on there already know so much more than me I have nothing to offer the group. </sarcasm>
The flo commander does exactly what I wanted it to do, exactly as well as It was advertised to do it. It doesn't claim to add any special element to the main circuit.
What it does do is let you fine tune the main jet mixture with the turn of a single knob on the outside of the carbs. The less air that comes in the main air jet, the richer the mixture from the main circuit is. Its the same as adding a larger main fuel jet.(disregard any minor fuel atomization differences). Dynojet used to send plugs in their jet kits to restrict or block off the main air jet so that you wouldn't have to run 230 mains on a tuned zx9. The thing is that most people claim its just "snake oil" because they don't understand how it could be beneficial to other people.
I swapped this motor, and with my relatively unique airbox, filter, carb setup, big bore etc.. I was having a really hard time finding which direction I needed to go on the main jet and by how much. It sounds easy when you read about tuning carbs, but sometimes lean feels rich, rich feels lean, and lean feels like timing issues, and it's all just a mess.
I got the FC to help me tune the carbs from basically scratch, and as soon as I got it on the bike, in an hour or so I knew within 2 or 3 jet sizes where I needed to be without changing any main jets. Thats me tuning on a backroad though.
There are plenty of reasons most people wouldn't ever need one. And honestly they're the majority. Most people install a jet kit on a mostly stock bike and the kit gives them instructions on how to do it and what jets to put in. There is no reason for those people to run a FC on their main circuit.
Other people do the kind of engine work I did and then they bring it to a dyno and use an AFR gauge to tell them how far off it is, and it doesn't take long for a dyno operator get the right jets in. (Turbo might disagree. lol) There isn't really a reason for those people to run a FC on their main circuit either unless they are fine tuning so much they are trying to move between jet sizes.