driving along on the highway. Thought I had my VE tables pretty close, so I locked BLM's at 128 and was doing some data logging.

For a given RPM and MAP value, my INT values are all over the place. Range from 90 to 140 in the same RPM/Map cell.

Seems like INT is not reacting fast enough to the O2 sensor and overshoots.

What's up??

 

How far from the exhaust ports is the O2 sensor now compared to stock? If further then need to slow down the PID loop.

RBob.

 

It's closer than stock.

Takes about 5-10 seconds to swing from hi to low

MIke

 

Just closing the loop here...

I moved the O2 sensor about 6" down the exhaust pipe. I think it was too close to exhaust valve #8 - about 3" away from it.

INT and BLM now holds much closer, but BLM's are running 119 to 121, where they were close to 128 most of the time before.

I gues this is one more pirece of data that says the O2 sensor is not 100% reliable. I suspect it was overheating.

Mike