Join Date: Jul 2006
Location: Valrico Florida
Regarding the VOM as a monitor on a narroew band O2 sensor; it can be done. I experimented with this years ago on a fuel injected 914. I discovered the maximum power was acheived @ .945 to .985 volts. I had a real-time adjustment in the car. I could set the O2 @ .500 (stoich) and the power was noticably reduced but great milage for the long haul. If I increased the mixture to above .985 the power would again drop off due to over-rich condition. The maximum output voltage of a narrow band 02 is 1.000 volt by design, my Fluke 77 would register 1.006. That's reasonably close. I don't know how the output voltage relates to A/F ratio but I couldn't argue with the seat-of-the-pants real-time test results. Also, be sure the circuit loading is minimal on your test meter. I believe it's at least 100K per volt on the Fluke. An inexpensive meter will not work.
'77 930 turbo Garretson I/C 1 BAR spring, (2) '82 Triumph Bonneville Royal Wedding Edition
Past rides: '74 914 1.9 liter twin plugged track car, '83 928S, '87 924S, '75 911S w '78 ROW 3.0, '72 911T, '70 911T and various other insignificant domestic examples. Happiness is a grey tailpipe! Turbo lag......it's worth the wait!