Dyno Tuning
Q. I would like to change my exhuast and my new bike has Oxygen Sensors, does it still need to be Dyno Tuned?
Q. What does the phrase Dyno Tuned mean?
Q. What is a Dyno?
A. A Dyno or Dynamometer is a machine that is used as a tool to measure horsepower and torque output.
A. A Dyno Tune happens when a technician uses the Dynamometer to simulate various driving conditions while monitoring the air/fuel ratio. When there is an improper air/fuel ratio the technician will make adjustments to the fuel curve for the optimum ratio resulting in a more effecient running engine.
A. Yes, the O2 sensors on new vehicles (cars included) are a narrow band sensor, and when you change your exhaust, the new airflow characteristics cause the O2 sensors to fall out of their intended range and be ineffective.
Q. Why does the dealer say that dyno tuning is not necessary?
A. Usually the dealer that does not have tuning experience with a dyno will tell you that the process is not neccessary because they don't understand the science behind a tuning session.
When a bike is put on the Dyno, a probe is put into the exhaust pipe and the emissions are recorded in a graph format. It is up to the technician to "remap" the bikes Electronic Control Module (ECM) to the correct air/fuel ratio.
Process...