the last time I looked into it the two motorcycle manufacturers that have a fully closed loop fuel injection system are Harley Davidson (Dephi system) and BMW. The new Venture has a limited closed loop, and maybe the FJR1300 - they will slowly adjust a little bit based on the O2 sensor reading, but it does not store the change - next time you start the bike up it goes back to the factory default.
This is a real plus for HD bikes - you can put after market exhaust on the bike and it will tune itself to the new airflow after a few tanks of gas. Im nearly certain that none of the other Vstar bikes have any closed loop feedback going on.
This is a big thing for people that modify their bikes - you can get a module that will reprogram the fuel/air map in your ECM, and let you play with the settings (no need to be messing with your injectors), or you can send your ECM to places like "Ivan's", tell him what intake pod and exhaust you have on the bike, and he will re-flash the fuel map to increase the amount of fuel the injectors fire into the cylinders.
You are right about the amount of air that can get into a stock Vstar bike. The engineers at Yamaha setup the air and fuel system to get the targeted HP and torque curves they wanted for the model. My VS650 and Royal Star 1300 are both stock, the 650 is 40hp, the Royal Star is 74HP (engine output). There are a lot of us out here that ride our bikes stock, and like them just as they came from the factory.
If you want to modify your 950 you can get more than 50HP out of it, easily. The air intake seems to be the single biggest improvement, then the exhaust, then you start looking at cams and a bore kit. For each of those you would need to get the "power commander" module to allow you to change the amount of fuel injected, or send your ECM to one of the mod shops for a one-time map change.
I did not catch that is a car tire - a lot of people get frustrated spending $200 to have a motorcycle tire put on their bike, and replacing it every 10 to 15k miles. I get that, If you like the way it rides I dont have any problem with that.
Motorcycles are in theory suppose to be less expensive to operate, so anyone trying to get the cost per mile down is doing it with the right vehicle.
If you are going to run the bike with no air filter, pull the plugs out in about 200 miles and google what a rich, normal and lean burning spark plug should look like. If the plug looks like its being consumed (the lean plug photos) the same thing is happening to your valves and the crown of your pistons. If thats happening then get the power commander or whatever module lets you adjust your fuel injection ratios and correct it. It will be way cheaper than burnt valves or pistons.
Last edited by KCW; 10-04-2018 at 06:18 PM.