The ECU calculates fuel requirements once per engine cycle, so at 6000rpm it's technically changing the fuelling rate 100 times per second. It's the O2 sensor's reaction time that affects how quickly the closed loop cycle operates. The faster the the O2 sensor's output changes, the faster it'll cycle. 4-5 times per second is about normal in my experience, but more modern sensors are probably better.

 

Hmmm, 100 hertz signal rate sounds kinda fishy...Let's assume a 3K cruise rpm; now, the CAS turns at half crank speed, correct? So 1500 rpm (25/sec) CAS input signals, all other fuel delivery related sensors (AFM, TPS, boost sensor, thermisters, etc..) are a straight DC voltage, no reference frequencies can be obtained from them, they have to be algorithmically mapped by the ECU before the results & fuel delivery outputs can be oscillated (or, switched to ground, if you prefer)...Now, at 3K, my primaries are doing something around a 22% duty cycle, which means no signal can be "delivered" (or changed) approx. 80% of the time. If we were to assume that the CAS signals "run the show", and that the injector pulsewidth can only actually be changed (compared to the previous pulse) when the coil is energized, we're looking at 25/.22, or 5.5 times per second (double this for 6K rpm, of course). Which, by the way, is almost exactly what the O2 sensor is showing me at 3K...

 

Wow...I...ummm...my brain is about to explode.

-Joe

 

sooo.... that means theres a lot goin on... right got that... lol