| Author | Message | ||
     Xb9 |
Is there a drastic difference in the RPM range that the Buell DDFI system runs in closed loop on an X1 vs an XB9R? Powercommander manual infers that the X1 is in closed loop at "cruise" RPM and is constantly adjusting for altitude, and the XB Manual says that the DDFI enters closed loop only above 5000RPM with O2 sensor at operating temperature. They also refer to a "box" in the lower RPM/load range of their map that should not be adjusted with the power commander, and this is the area in witch I need to adjust. Maybe Aaron can give me some help with this, as I know he has some experience with this unit on an XB. Thanks in advance for any input. | ||
| Bud |
Xb, I had a good talk about this subject, with some German guy’s, who races Xb’s & build turbo on xb’s. They had the turbo over here in holland @ dynojet.nl for a tune-up, They found out that a powercommander has no sense on a xb as the ecm is very good self learning and they hade no need for a high performance O2 sensor. ( it seems that the only time the ecm uses the open loop is during idle & WOT ) Sure you can fine tune it with a PC3 , but the ECM is very good on regulating and it will adjust it value’s back to the needed settings. And with the race ecm they could not use the powercommander at all, because it’s unable to set a good af value ( it was going way to rich ) And if it goes out off his parameters a check engine light will come on. Btw, they run the turbo with a stock ecm and nothing else ( they had a PC3 in but at the moment it’s unplugged ) Powercommander self is not going to develop any further for the xb, one off the reasons is that the bike don’t need one. Just sharing some thought, Gr, B | ||
| Sparky |
I'd be interested in seeing how their turbo is mounted & other mods necessary to make it work, especially that it apparently does not need additional fuel programming. The XB engine, frame & inlet breathing configuration seems ideal for a turbo application. | ||
| Xb9 |
The reason I am looking at the powercommander, I have a Latus muffler and drilled airbox cover. The bike runs rich (when hot) from 2500RPM to 4000 RPM with either the Race or Stock ECM. The AF value seems perfect from 4500RPM on up, which makes sense because it is running in closed loop above 5000RPM and adjusting based on the O2 sensor. The problem here is the shape of the AF map, which you can't change within the ECM. The ECM take the O2 sensor reading above 5K RPM(closed loop), and compensates by raising or lowering the complete map, but it is not capable of changing the shape of the map. I'm hoping I can lean out just the bottom end and maybe a little on the midrange with the power commander, in effect changing the shape of the map. | ||
| Misato |
anyone got maps to download for the PCIII on an XB? |
