| Author | Message | ||
     Pontlee77 |
Up on Checking trough ecm-spy the info about the engine i noticed that the AFV was showing 120. The bike runs fine is a 2002 X1 with k&n air filter and a D&D full system exhaust. If it's over 100 what does it mean the mixture is lean or rich? Should i do an afv reset? All advices well recieved. Thanks | ||
| Phelan |
If it's a cold day at sea level, that's pretty normal. AFV is adaptive fuel value. It's a multiplication factor for the fuel tables. It adapts to weather conditions according to the AFR from the 02 sensors. Cold days have more dense air than hot days, and sea level air is more dense than high altitude air. These factors affect the AFR, because the fuel used is a fixed amount according to the tables. The AFV changes the tables to try and best attempt the target AFR tables (not visible in ECM Spy, except maybe in ECM Spy Mono). Hope this makes sense and helps. | ||
| Pontlee77 |
Today is +30c did a 30 mile short ride from 200 to 700 altitude, but havent checked the Afv for quite some time. | ||
| Akbuell |
As Phelan said, the engine control unit modifies the entire fuel map rich or lean depending on conditions. Richer for cold, dry air, leaner for hot air or high altitude. In your case, an AFV of 120 is richer than the 100 base line. A low(er) restriction air filter, along with a low(er) restriction exhaust, means you engine is flowing more air than stock, so needs a richer mixture. Short answer, if it runs fine, there is no problem, especially if your plugs look good. 120, in this case, can be considered 'normal'. Hope this helps, Dave | ||
| Pontlee77 |
Thanks for the replies, i will keep an eye on it. | ||
| Kalali |
Technically, AFV of 120 means that the base mixture is slightly lean in the local closed loop area of the fuel map and the ECM is adding 20% more fuel across the map to compensate for this condition. I would follow the recommendations provided earlier and would not be too concerned. |
