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| Author: | Simon Crook [ January 13th, 2010, 11:47 am ] |
| Post subject: | Air Fuel Ratio Gauge |
Here's one for the technical minded - whilst having yet another tidy up in the garage yesterday, I found this in a box: I assume (which is always a worry) its some sort of Air Fuel Ratio Gauge (whatever that does) there is no makers name anywhere on the gauge, so I can't really do much more research, the little research I have find is it needs a 'narrow-band 02 sensor' (if this is correct!) The gauge has 3 wires coming off the gauge (red,blue,black) going to a plug. 1, What do I need to make it work 2, Where does the sensor go 3, And really what does it really do |
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| Author: | toomany2cvs [ January 13th, 2010, 12:02 pm ] |
| Post subject: | Re: Air Fuel Ratio Gauge |
Simon Crook wrote: the little research I have find is it needs a 'narrow-band 02 sensor' (if this is correct!) That's a surprise - I'd have expected it'd want a wideband. Quote: 1, What do I need to make it work At a guess... Earth (black?), live (red?) and lambda (blue?) signal. If you put +12v across black and red, it might fire into life, but won't give you a sensible reading without the lambda signal being present. There's two basic lambda technologies - Zirconia (common), which ranges from 0.1 to 0.9v, and Titanium (rare), which ranges from 0 to 5.0v. Feed a low voltage (near-flat AA battery?) into the blue wire and earth, and see what happens. Lambda sensors come in a variety of wiring, too - 1, 2, 3 or 4 wire. 1-wire has a signal wire and earths through the exhaust. 2-wire has an earth wire 3-wire adds a live for the heater (they don't work properly until they're hot) 4-wire adds a separate earth for the heater. http://www.lambdasensor.com/main/mcolours1.htm Quote: 2, Where does the sensor go In the exhaust, as close to the head as possible. Ideally, on a 2cv, you'd want a pair of AFR meters, one for each side. Quote: 3, And really what does it really do It tells you whether your engine is running rich or lean, and how much. This is why a narrowband sensor surprises me - a narrowband sensor only works around a fairly small distance from stochiometry - 14.7:1 air:fuel. That's where you want the mixture to be for a cat to work effectively, but not for either maximum power or maximum economy. A wideband sensor will give a sensible reading over a much wider range of air:fuel. Why do you want it? To help you get the fuelling right. Typically, you'd add one if you were putting on injection - Megasquirt or similar - and trying to set the fuelling map up. With carb, it'll help you get the jetting right. |
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| Author: | Simon Crook [ January 13th, 2010, 1:16 pm ] |
| Post subject: | Re: Air Fuel Ratio Gauge |
Hi Toomany blimey sounds a bit complicated! with the narrowband sensor its only what I found so you are more than probably right about the wide band. if I am reading it right, i need to put a 12v + across both the black and red wire to see if it lights up, or do I earth the black then + the red as for what I need it for, the jetting on the race car is always a problem, so every little helps, it just where I place it it would have to go where the two pipes go into the 2-1 can I get and use a secondhand sensor from the breakers |
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| Author: | toomany2cvs [ January 13th, 2010, 1:27 pm ] |
| Post subject: | Re: Air Fuel Ratio Gauge |
Simon Crook wrote: if I am reading it right, i need to put a 12v + across both the black and red wire to see if it lights up, or do I earth the black then + the red I'd expect black to be earth, red +12v. Quote: as for what I need it for, the jetting on the race car is always a problem, so every little helps, it just where I place it it would have to go where the two pipes go into the 2-1 How far back in the system is that? Quote: can I get and use a secondhand sensor from the breakers Lambas are (OK, medium-to-long-term) consumables, and usually a right bugger to remove, since they screw straight into the exhaust downpipe normally... They're cheap anough, anyway, if all you need is a narrowband. http://www.lambdasensor.com/main/muniversal.htm <£30 for a generic... Widebands are much, much more specialist bits of kit. http://www.lambdasensor.com/main/mwide.htm (I've not dealt with that site for lambdas, but I think they're the outfit I used to recon the Saab's injectors last year - in which case, I was very impressed with their service.) |
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| Author: | Simon Crook [ January 13th, 2010, 7:45 pm ] |
| Post subject: | Re: Air Fuel Ratio Gauge |
Hi Toomany connected the red to the + and black to earth, 3 off the little lights flickered then one light stayed on, the length of the exhaust pipes to the red cross (see picture) is 120 cms (both the same) I will contact Lamdasensor.com tomorrow and see what they say cheers |
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| Author: | grifftravel [ January 13th, 2010, 8:34 pm ] |
| Post subject: | Re: Air Fuel Ratio Gauge |
Nice exhaust pipes, where did you get those? |
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| Author: | Simon Crook [ January 14th, 2010, 12:03 am ] |
| Post subject: | Re: Air Fuel Ratio Gauge |
Hi Grifftravel its a Simpson race complete system - www.simpsonraceexhausts.com |
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| Author: | toomany2cvs [ January 14th, 2010, 9:34 am ] |
| Post subject: | Re: Air Fuel Ratio Gauge |
Simon Crook wrote: connected the red to the + and black to earth, 3 off the little lights flickered then one light stayed on Sounds like that's powered up, then... Tried feeding the blue wire ~1v and seeing what it says? Quote: the length of the exhaust pipes to the red cross (see picture) is 120 cms (both the same) I'd hazard a guess that that's a bit far back. |
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