Author Topic: Air Fuel Ratio Meter  (Read 486 times)

Online Kiwi_Roy

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Air Fuel Ratio Meter
« on: January 23, 2019, 12:18:51 AM »
I have this narrow band meter, i used to have it installed in the crossover of my VII Sport.

My friend wants to borrow it to help tune his Kawasaki, we are thinking it might work if we stuff it up the exhaust one at a time so I extended the sensor with a couple of feet of 1/2" conduit leaving a leak path so the cell gets fresh exhaust.
I thought I would try it out on my Honda CRV but i got no response it just stayed at 24.6%
Now the Honda has a Catalytic converter could that be the reason?
The cell seems to get up to temperature but the exhaust is quite cool I only let the car idle for about 10 minutes.

Does anyone have a sensor that works up the tailpipe?

Any thoughts?

Thanks
Roy
72 Eldorado
07 Griso 1100
17 V7iii Special

Moto Guzzi - making electricians out of riders since 1921

Online beetle

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Re: Air Fuel Ratio Meter
« Reply #1 on: January 23, 2019, 01:59:51 AM »
Don't you mean wideband meter? You want somethng like this:





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Offline pat80flh

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Re: Air Fuel Ratio Meter
« Reply #2 on: January 23, 2019, 04:52:32 AM »
I'm not sure if it will work stuffed up the tailpipe but definitely not if it is post=catalyst.  On automotive sysytems the post catalyst sensor is only there to measure the efficency of the converter. Pre- converter sensors will swing up and down as the computer varies the fuel input, post-catalyst sensors remain fairly steady, if the downstream sensor varies like the preconverter it means the catalyst is used up.

   So on your honda experiment, seeing steady voltage downstream of the cat. is probably normal. I guess you could try setting your rig up on a bike without a converter and see how it responds.
   
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Online Kiwi_Roy

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Re: Air Fuel Ratio Meter
« Reply #3 on: January 23, 2019, 04:57:05 AM »
Don't you mean wideband meter? You want somethng like this:

Probably - yes I can make something like that, thanks Mark
It obviously operates in the end of tailpipe then.

 
72 Eldorado
07 Griso 1100
17 V7iii Special

Moto Guzzi - making electricians out of riders since 1921

Online Bulldog9

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Re: Air Fuel Ratio Meter
« Reply #4 on: January 23, 2019, 01:51:08 PM »
As others have mentioned, it should be upstream from the Cat, but you also need a solid ground for the sensor, and it should be oriented properly in the exhaust 'stream'
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Online Kiwi_Roy

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Re: Air Fuel Ratio Meter
« Reply #5 on: January 23, 2019, 02:56:58 PM »
  So on your honda experiment, seeing steady voltage downstream of the cat. is probably normal. I guess you could try setting your rig up on a bike without a converter and see how it responds.
   
Yes I plan on doing that, the tenants don't appreciate me running my bikes in the underground garage after 10PM for some reason.
I will report back
72 Eldorado
07 Griso 1100
17 V7iii Special

Moto Guzzi - making electricians out of riders since 1921

Online Kiwi_Roy

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Re: Air Fuel Ratio Meter
« Reply #6 on: January 23, 2019, 09:59:45 PM »
I stuffed it up the pipes on my 72 Eldo, it reads at least but I never had time to let it get properly hot. Saw it down to 15% at one stage.
I will pass it over to Ross he can figure out how to use it.
« Last Edit: January 23, 2019, 10:00:39 PM by Kiwi_Roy »
72 Eldorado
07 Griso 1100
17 V7iii Special

Moto Guzzi - making electricians out of riders since 1921

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