Scott, I really enjoy everything you post, research, and verify concerning our FI bikes. you are becoming a very important asset to the Roadie FI community. We have not really had anybody that could really answer the questions and why with the FI roadies. So with that...Thank You!
I currently have my 08FI torn down doing the "Yamaha full Stage III Speedstar upgrade" so for the other readers. Full stage III = Pipes, BAK
, 45mm Thottle Body, New Intake Manifold, HC
Pistons, Speedstar Valve Springs, and Speedstar Cams... With that, it it is basically what a warrior would do to go stage III, the difference is the warrior goes to stage IV with high flow injectors and a new ECU.
Yamaha never produced a ECU to take the FI Roadies to stage IV, so my question is? Will the roadie's stock ECU handle the high flow injectors? The larger throttle body and manifold will definately provide adequate air. but the question that puzzles me... the limits of the stock ECU. As far as I know, I am probably the only FI guy taking the roadie to Stage III on this forum or RSR
Thanks for your opinions and advice.
I also own an 08 and and got a good deal on a set of 3" big straights so i put them on along with a K&N BAK.The pipes i got where they welded the bungs for the o2 sensors the wire was pinched tight against one of the mounts.So i eliminated the sensors and installed a power commander III usb.Went through and downloaded it to my bike and pipes and have not had any problems as of yet.I put about 5000 miles on it since, my plugs look normal.I have noticed better performance,but my fuel mileage is still about 30 mpg depending on how i ride.I am going to put it on a dyno this summer just so i can see what my numbers are.
You can put it on a dyno and remap and remap and remap but you'll never be able to emulate what the O2 sensors do at a steady cruise. I mean, they're returning a new voltage signal to the computer 8 times a second and the computer is adjusting the injector timing according to the signals it receives.
If there's any way you can get the O2's back, maybe relocate the bung or something, you'll notice a big difference in fuel mileage. 30 mpg during normal running on a FI bike means there's something wrong.