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#11 Re: a/f guage and sensor install, ideas/help wanted
Posted on: 2010/1/30 12:59
Im runnig straight lpg, no petrol so can run a bit leaner. stioch for lpg is 15.5ish not 14.5ish

so as long as it shows and indication towards those kind of readings, im in a happy place.
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#12 Re: a/f guage and sensor install, ideas/help wanted
elemental_funk Posted on: 2010/1/31 7:10
Its almost a waste of time and money, even if you already own a sensor. I have spent dumb money on these before. Only the very expensive wideband guages really work, and would only really be there for looks, anyone can hear a ping or feel a flat spot. As for the other type, outside of absolute stoich it becomes an exponential reading (impossibly innacurate), and they just move up and down like pretty lights.
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#13 Re: a/f guage and sensor install, ideas/help wanted
Mildman Posted on: 2010/2/1 0:57
Quote:

Rezlo wrote:
Quote:
A 'narrow band' or std 02 sensor is good enough to pass Euro IV emissions, should be good enough for a AFR gauge on the dash of the datto.

Except that Euro emissions complient cars almost always run at stoich during normal drive cycle, and use the sensor to activate short and long term trims to keep it at stoich besides for WOT

The datto is at stoich almost never which means all the gauge will show is rich or lean and never give actual info that can be used to set up any form of tuning or mapping.

Quote:
Haven't seen a wideband (at least not Bosch) that can be reliably run without a control unit, as all widebands I've heard about require specific heating routines and need to be able to constantly vary current/voltage with changes in AFR (that's how they get a wide band signal) - they are essentially a 'narrow band' with some extra computer smarts attached.

Narrow band = non linear 0-1V
Wide band = Linear 0-5V

95% of wideband kits now use a gauge with all the hardware in the gauge and are small and compact such as AEM.

I run a PLX in my Datsun when I make jetting changes, I think maybe 5% of the time it actualy sits on stoich, never the less I think a $300au wideband is cheaper than rebuilding a motor, thus I use what works when making changes or trouble shooting


True you can get kits that include sensor, control unit (required for wideband operation), and gauage - also there are some "wideband" sensors out there that will also send an emulated 0-1V back to the ECU (linear rather than exponential crazyness) and a 0-5V to your accurate gauage or dataloggger.

I still think my statement about all wideband sensors also have a little computer box to create the wideband signal stands, but gauges are also available to plug into these control boxes. The actual materials inside a "wideband" 02 sensor don't differ from a narrow band much - it's the computer smarts that create the wideband signal (at least in Bosch land)

To plug into one of those Jaycar kits - they are set up for a 0-1V signal from a narrow band sensor and would be an 'indication' only sensor, a reality check if you like with a light for lean and a light for rich....
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