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General Category => General Discussion => Topic started by: Kiwi_Roy on January 23, 2019, 12:18:51 AM

Title: Air Fuel Ratio Meter
Post by: Kiwi_Roy 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

Title: Re: Air Fuel Ratio Meter
Post by: beetle on January 23, 2019, 01:59:51 AM

Don't you mean wideband meter? You want somethng like this:


(https://i34.servimg.com/u/f34/18/91/78/64/36cb4610.jpg)

Title: Re: Air Fuel Ratio Meter
Post by: pat80flh 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.
   

Title: Re: Air Fuel Ratio Meter
Post by: Kiwi_Roy on January 23, 2019, 04:57:05 AM

Quote from: beetle on January 23, 2019, 01:59:51 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.

 

Title: Re: Air Fuel Ratio Meter
Post by: Bulldog9 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'

Title: Re: Air Fuel Ratio Meter
Post by: Kiwi_Roy on January 23, 2019, 02:56:58 PM

Quote from: pat80flh on January 23, 2019, 04:52:32 AM

  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

Title: Re: Air Fuel Ratio Meter
Post by: Kiwi_Roy 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.