Theres a few import guys modifying existing a/f gauges to read volts off the 02 sensor instead of showing a lean/rich condition. Check out www.gadgetseller.com/gauges to see what I mean if you want.

My question is, what is the advantage of knowing the voltage that your 02 sensor is putting out? Is there something I'm missing here? Should the 02 sensor be at a certain voltage...which would make constant analysis necessary?

Confused on this subject.


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91 Formula
305 TPI 5speed
1LE/G92/WS6
Custom cold air intake w/K&N, SLP airfoil, ported plenum, TB coolant bypass,Crane AFPR (47psi),94 octane,Crane Extruded Alum. 1.6 full roller rockers, Timing set from 4*BTDC to 10*BTDC,MSD6AL, Holley 9mm Annihilator Laser shot 50 wires, Ac Delco cap,rotor and plugs, Bosch O2sensor, SLP 1 5/8 headers,SLP catback,3:73s,JET 195* fan switch, Macewen white face gauges, Intellitronix Digital Gauges

Street legal with stock throttle body, runners,intake manifold,cam, and heads.

 

Well I'll be damned, the guy on that website has a good point. What he's done is narrow down the band that the air/fuel gauge works on. (All a/f gauges are voltmeters.)

He's showing how "out of the box", those meters show from 0 to 1.00 volts. After his change, the meters show from 0.77 to 0.96 volts. This way the gauge shows him 0.26 volts, at 0.02 volts/led. Out of the box, the gauges show 0.050 volts/led. He can now get greater accuracy.

I guess the Q left is "where do our sensors operate the most"?

And maybe, why doesn't he have a model with a switch for "normal accuracy vs. fine accuracy"?


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
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[This message has been edited by TomP (edited December 19, 2000).]

 

He's making a more precise A/F meter, not a more accurate one. Greater precision is nice, but I don't think it makes the A/F gauge any more accurate as a tuning tool. There's no easy way to simply convert the O2 sensor voltage into an A/F ratio without knowing a host of other variables. At best it still only tells you if you're grossly rich or lean.

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1984 Camaro Z28 Astral Silver w/ 2 1/2" cowl induction hood
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Exhaust: Terminator headers, Custom 3" TIG welded stainless exhaust, Twister muffler
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Drivetrain: 2.73:1 limited-slip Dana 44 w/ disc brakes
Tires: Front P225/50VR15 Rear P265/50VR15 Eagles

 

Eh, well, that's what I meant to say (precise). It's been a few years since Physics 1, I forget about that precision vs accuracy difference sometimes


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
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