Originally Posted by 2010 WRX Limited
EGT alone are not enough to sustain the reaction. Ask any good Subaru tuner- when you are in closed loop cycle the air to fuel ratio constantly fluctuates in order to keep the catalytic converter operating. Go out and log your car, you will see it.
I thought most fluctuation was due to lag from the O2 sensor measurement to the ECU adjusting fuel/timing, but I'm not a tuner, and Subarus are rather new to me.
Well it's been a slice, but I have my post count up enough so I can formally introduce myself elsewhere. Then I'll need a few more so I can see web addresses and the like...
Have fun with this. (Was this just over someone calling you an ass in the AirCare thread?)