Some of you have no doubt followed Roger's threads on the device he has developed to cure the overly lean fuel programming of oilheads, hexheads, 650/800 twins, etc (and its being developed for more models). The devices are sold by Beemer Boneyard and you can read their comments on the item page on their site.
Today I installed one of Roger AF-XiED devices on the SO's R1100S, an 04 model that she uses as a touring and play bike and which I have farkled to make it more suitable for her touring use with comfort, lighting, now performance, and other items.
If you do any routine service on an oilhead, this is a silly simply install. Just pull the panels, lift the gas tank to the rear and plug it in, the connect 1 ground wire to a battery terminal- pretty hard to get any easier. For the major connections, one locates the oxygen sensor connector under the fuel tank, opens it up, and plug 1 end of Rogers device cable into each end of the plug, then just put it back on the bike. No hacking into factory wiring needed- this is pure plug and play. Gets positive power from the installed oxygen sensor cable hookup and has a negative wire that can go on a battery post- that's it. AFR can be adjusted through a reasonable range with a single screw if one wishes to experiment.
I expect the adaptive features of the Motronic will take a tank or two to fully adapt to the device which I installed with its default setting. Nonethless, I went for about a 50 mile test run after the install for an initial impression and the SO and I are planning a riding day tomorrow so she can comment on her impression- I am telling her none of mine and will wait to hear what she says.
I have ridden and serviced this R1100S for several years so am familiar with its factory behavior, now modified. Probably the best way I can summarize the effect of the AF-XiED is to say that it has widened and smoothed the bikes powerband so that it has become pretty similar to the K1200RS that it sits next to in the garage, the latter with a Rhine West chip to enrich fueling and a slip on, the result of which is the most pleasing wide and linear power band of any BMW I've ridden. Not that the R1100S can match the K brick for total power or torque, but qualitatively, with the AF-XiED in place one is no longer conscious of the R bike's former much narrower powerband which kept telling the rider to stay in a narrow rpm range. Now runs to redline are smooth and encouraged. The bike will pull cleanly all the way in 6th from as low as I've checked it which was 1600 rpm- try that with stock programming. Basically, it pulls clean and fast in any gear from any sane rpm, not something the stock bike will do. My brief test run today took the bike to about 110 (we live in a rural area) and I could identify no negative fueling issues.
If I had a dyno I'm sure it would show both the more linear power curve and a bit more power up top.
I'll have more comments after we get more miles on the bike but one thing I can tell you- its not going to come out- works way too well to debate. At a fraction of the cost of installing other devices like the Power Commander with only a fraction of the work. Planning to put one on my hexhead when I get time.
As you might deduce from my board name, I am no stranger to highly modified fuel injected motors, having owned a variety of such including a turbo'ed Lexus SC300 I use as a street car that makes about 400 rwhp and my former track only RX-7 that made 510 rwhp with its turbo. All of that requires extensive electronics changes- in the old days one had to develop ones own fuel maps from scratch and that took a bunch of dyno time. It was a combo of effort and cost that kept me from addressing the lean programming of the bike sooner- this device cures both issues.
The Af-XiED requires only very modest effort to correct the fundamental overly lean fuel mix of BMW bikes and greatly improves ride-ability. Highly recommended..(more to come also)