Here's the bad news... My PC Laptop took a crap in the heat so I have not been able to run data logs so far today... But, before it crapped-out, I had set the secondary bank voltage at 2mv on both 2/1 & 2/2...

After I spent 30 minutes trying to get my freakin' #$%$%&%*%&%^& laptop working... I gave up on the data logging, but kept playing with the GIZMO even though I was unable to see the output voltage or timing / fueling data... But I had marked all the pots last night to the corresponding voltages...

Knowing that the secondaries were at appx. 2mv, I cut the signal wires on both primaries and let the GIZMO take over... I had the 1/1 &1/2 pots set at appx. 8mv when the wires were cut... The engine was at idle in closed loop operation at appx. 750 rpm... It took about 5 seconds before the engine started sputtering, not bad, but a notable change that almost seemed to be a misfire, and rough idle...

By the time I got back into the cockpit, it was idling very rough with the tachometer bouncing +/- 100 rpm... Then I noticed a CEL and was pissed that my laptop had crashed and could not check the DTC...

Since I was already knee deep into this process, I started adjusting channel 1 & 2 (primary sensors 1/1 & 1/2) to see what happened... I slowly reduced the voltages to about the 6mv mark and the engine started idling nice and smooth and the tach leveled off...

I then decided to give it some throttle and brought the RPM's up to 2k and held my foot very steady to maintain that RPM... The engine felt a bit out of sort, not a misfire, nor running rough, but something felt / sounded different... I held my RPM's perfectly at 2k and then reduced the voltage slowly on 1/1 & 1/2 and the RPM's slowly raised till I hit the 5mv mark on the pots and then flattened out at 2,300... When I reduced the voltage more, the RPM's dropped back down to 2k... And conversely when I increased the voltage the RPM's dropped as well... This told me that I could find a "sweet spot" in voltage output for the 2k RPM range...

I then took it up to 4k RPM and held it steady... then I adjusted the 1/1 & 1/2 channel downward till I found the "sweet spot", about the 4mv mark... As I reduced the voltage from 6mv, the RPM's increased to about 4,500 until the 4mv mark and then as I reduced the voltage more, the RPM's started to decrease back to 4k...

So MAD SCIENTIST WOODY... Even though I was unable to log the data to verify the results, I can tell you that your little GIZMO does something to alter the performance of the engine by over-riding the voltage output of the 02 sensors...


My PC Laptop has come back to life now that it has been sitting in the air conditioned house for an hour... So, I'm back to testing in a few minutes (and a few beers) Hopefully I can capture some data this time and see what this voltage adjustment is doing with the AFR / TIMING...