Buell xb12scg after Dyno problems.
Hello. Im looking foor knowledge to help with my Buell. It is a xb12scg 2008 with a HP RS408 muffler and a K&N airfilter. A week ago it was on a Dyno adn it was set up as follows; TPS reset was done. After that the tuner added two dynojet lamdas into the headers. And after that the setting up began. We got a nice 92HP/107Nm.
The problem is that yesterday as I started it after riding 15 minutes with it, it sounded like this when cold https://www.youtube.com/watch?v=xkh1Ttms7jU (not my video, but almost exactly the same symptoms). What might be the cause of this?
Afterwards dynoing, I found this info;
"On a Dyno
Probably the best way to get the fuel maps right, as long as the dyno operator is good and knows a few basic facts about the Buell ECM.
Always check or reset the TPS before setting up the Buell on a dyno. If this is not done and the TPS is out, then all maps setup on the dyno will be out by the same amount when the TPS is next reset. This can easily be done by the owner before going to the dyno shop. Don't waste your money asking the dyno operator to do this!
Reset the AFV to 100. This is also essential and should be done immediately on arrival at the dyno shop. If the AFV is above 100 when you start tuning, it will be adding fuel above the closed loop area.
Disconnect the O2 sensor! That's right, disconnect it before tuning on the dyno. If you leave it connected when setting up the ECM in the closed loop area, the ECM will adjust the AFV value and screw up the tuning! Remember to reconnect it when you have finished. The Buell ECM must be tuned for 14.7:1 Air/Fuel mixture in the closed loop area. Tuning for anything else will cause the ECM to set the AFV to correct it. End result will be incorrect maps outside of closed loop and potential risk of engine damage!
If the dyno operator can measure front and rear cylinder mixtures independantly, then go for the best he can do. If not, make sure both cylinders get the same changes or you could run front spot on, and the rear lean!
Always check the AFV value after tuning, it should be at 100 as the O2 sensor has been disconnected. Test ride the bike, ensuring you do some closed loop riding, then check the AFV again it should be between 90 and 110.
CARE: It is known for a Buell to be setup perfectly on the dyno with the O2 sensor connected, but then to go off when used for a few hours. This is almost always because the O2 sensor was left connected, the bike goes through closed loop riding and adjusts the AFV. "
Was the dynoing for nothing, now that we did not do exactly like this on the dyno shop..?
