Tomorrow might be the day

O2 sensor on a motorcycle????????? Most bikes use an "open loop" EFI system, which means they use a "map" for their injection. Bikes calculate injection based on this map, no O2 sensor involved. Cars have the O2 sensor and don't have a "map", but rather work off the O2 sensor to determine proper injection.

I've never heard of a bike with a closed loop system. But, then, I don't know a lot about EFI. This is just how I understand it. I've never worked on an EFI bike that had an O2 sensor.

Goose, all Dyna EFI's are closed loop now and most exhaust manufacturers are installing bungs including the true duals.
The Honda VTX1800 has always been closed loop from what I remember.

Given a choice between an open loop mapped EFI and a true closed loop with a good sensor i.e. 5 wire type I would take the closed loop every time.

Technology wise the open loop we are now using is about like a mid 80's throttle body system. Be nice to at least get into the mid 90's

Interesting. Wonder when the sport bike stuff will go closed loop? Maybe there might be a bit of an advantage to the open loop where big mods are concerned, using the PC to map it? Just wondering.

The superbike teams can afford whatever they wanna run, though, I reckon. Heck, they just started running EFI less than a decade ago. EFI on sport bikes is about a decade old. Most had carbs in the 90s. Now, even econo bikes like the SV650 have EFI, the SV starting in '03. All the sport bike stuff is open loop, though, to my knowledge. I need to pay attention to this. Might be going close loop on some of the newer bikes. A bunch of the Yamahas are new design this year. The FZ1 has been revamped quite a bit. The new thing is the underbelly exhaust can, sorta like Buell has. It could contain an O2 sensor in one of those cans and not mess up styling cause you'd never see it. Hmmmmm.