| Author | Message | ||
     Vagelis46 |
These are my questions : 1. How long it takes for the stock ECM to calibrate itself when you run it bellow 4000rpm for the closed loop operation, if for example you install a K&N air filter ? Is it something like 10sec or 10min? 2. Will the closed loop theoretically compensate 100% for a K&N + removed snorkel+airbox holes? Or will it try to adapt to the mods, but will not reach the full potential? 3. Will the closed loop go as far as adapting to a aftermarket exhaust+intake modification? 4. Can the stock ECM be reprogramed with new maps? I know that for some bikes this can be done e.g. TRIUMPH. What about BUELL ? Or since there is this closed loop no re-mapping is necessary and the system can compensate for all the changes ? | ||
| Al_lighton |
1) on a fully warmed up bike, 2-3 minutes in steady state operation, light load, between 2-4K RPM will reset it. The very specific algorithms and operational range isn't known exactly. But 2-4K RPM for an XB12 and 2-5K RPM for an XB9 seems to work from my experience. The key is steady state. Moving the throttle around, or going up or down a big hill, will kick it out of AFV learn mode. 2) Intake changes like that are pretty linear (i.e, fueling change percentages tend to stay about the same across all RPMs), so the compensation is pretty darned good. 3) Exhausts have strong frequency dependent response due to acoustic resonance properties in the exhaust system, and the impact that has on intake fill. Adaptation is dependent upon how close the torque curve shape follows the torque curve shape on the Stock or race exhaust. 4) Yes, Directlink can reprogram the internal map. Do a search here on badweb on the term, there is plenty written here. Done right, it can yield fabulous results. Done without a wideband sensor and/or a dyno, and the chance of success is low. Tuning a Buell is trickier than most due to AFV interaction, very specific procedures must be followed. I cover those in the tuning guide I wrote that I include with it when we sell DirectLink Al (Message edited by al_lighton on October 02, 2006) |
