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Re: a/f guage and sensor install, ideas/help wanted |
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No life (a.k.a. DattoMaster)  
Joined:
2003/9/2 6:01
From SE Melbourne
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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....
Posted on: 2010/2/1 0:57
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Mildman, Datsunless
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Re: a/f guage and sensor install, ideas/help wanted |
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Home away from home  
Joined:
2008/8/29 3:06
From Sydney NSW
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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.
Posted on: 2010/1/31 7:10
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Re: a/f guage and sensor install, ideas/help wanted |
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Guest_
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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.
Posted on: 2010/1/30 12:59
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Re: a/f guage and sensor install, ideas/help wanted |
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Home away from home 
Joined:
2007/9/8 14:27
From South Africa
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Just an FYI, My bone stock A12 never once went leaner than 14.2, I tried to play with the jetting a tiny bit which resulted in slightly better AFR's but the car ran like rubbish, seems as they like to run slightly on the richer side of things. Anyone else notice with when using a wideband on a stock A-series?
Posted on: 2010/1/30 6:18
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_________________
'75 1200 B110 - 154hp Race prep A14
'97 Silvia - 600hp SR20 time attack
'07 Hilux - Tow car
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Re: a/f guage and sensor install, ideas/help wanted |
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Moderator  
Joined:
2001/5/3 7:04
From 48 North
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Contentmaster
Usermaster
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Yes, to control emissions they just read if it passes the stoich line. Normal sensors don't actually tell you an accurate A/F ratio. Wideband sensors are guaranteed for that.
That being said, it seems normal sensors can give you an indication of A/F ratio, while not very accurate, is good enough for testing or rich/lean indication.
Posted on: 2010/1/29 21:17
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Re: a/f guage and sensor install, ideas/help wanted |
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Home away from home Joined:
2007/9/8 14:27
From South Africa
Group:
Registered Users
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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
Posted on: 2010/1/29 20:03
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'75 1200 B110 - 154hp Race prep A14
'97 Silvia - 600hp SR20 time attack
'07 Hilux - Tow car
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Re: a/f guage and sensor install, ideas/help wanted |
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Just can't stay away  
Joined:
2007/4/20 11:46
From Invercargill, new zealand
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Ive got a 4-wire nippon denso wide band sensor on the a15e ive built. Havnt run it yet though so cant give any other information. I dont have a gauge but the computer will let me know whats happening when its connected to the laptop
Posted on: 2010/1/29 18:58
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Re: a/f guage and sensor install, ideas/help wanted |
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No life (a.k.a. DattoMaster) 
Joined:
2003/3/2 6:16
From Melbourne AUS
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Registered Users
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be sure to install the o2 sensor as close as possible to the ex manifold but without exceeding the maximum operation temp of the sensor.
Posted on: 2010/1/29 13:23
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1973 B110 A12
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Re: a/f guage and sensor install, ideas/help wanted |
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No life (a.k.a. DattoMaster) Joined:
2003/9/2 6:01
From SE Melbourne
Group:
Registered Users
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Cool, I hear you get a good deal on them anyway...
Posted on: 2010/1/29 13:18
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Mildman, Datsunless
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Re: a/f guage and sensor install, ideas/help wanted |
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Guest_
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should be fine with lpg, saw some of the bosh 4 wires go 160,000kms before replacing
Posted on: 2010/1/29 10:34
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