O2 sensor Q
I set up an O2 sensor in a bung on my exhaust. When I first fired it up all readings were in the mid 12's and I was happy. Then after maybe 1.5 min all the readings went up to mid 14's. I am sure the car did not change that quickly. Is it possible that the leaded gas messed up the sensor that fast, or something else messed w/ the sensor? Any ideas?
Mark
1990 Van Diemen, the Racing Machine, CM AutoX, 2016 Frontier
You can try to make a street car into an autocrosser or you can do a lot less work and make a race car into a great autocrosser
O2 sensors need to get hot before they work right I think.
Also if you can just get the lambda reading instead of converting to A/F ratio it will be more useful
It takes an O2 sensor CONTROLLER to manage the heater in the sensor. Several companies make them, but you can't just 'stick' a sensor in the exhaust bung and have it work.. for long. If you don't have a controller, that's your problem. If you DO have one, you need to contact the vendor.Originally Posted by mikey
Second item in above post ... "more useful"... WHY? the Lamda and A/F are directly related by simple math, aren't they? What makes lambda more useful?
Steve, FV80
Racing since '73 - FV since '77
I got a Magnum AFR gauge(and a Bosch sensor). The paperwork shows gauge connected directly to the sensor. Plugs show rich mix.
Mark
1990 Van Diemen, the Racing Machine, CM AutoX, 2016 Frontier
You can try to make a street car into an autocrosser or you can do a lot less work and make a race car into a great autocrosser
Did you get the wide band unit or the narrow band one?
Actually, I don't see a WB option. The only info is for a narrowband unit. It's intended ONLY for street cars and won't actually give you any useful info for racing ..at least I don't think it will.
Steve, FV80
Racing since '73 - FV since '77
Lambda /AFR
Yes the wide band sensor is the one to have. Lambda is the preferred readout in almost all tuning as Lambda is "one" no matter what fuel you use.
Lambda is preferred because the stoichiometric AFR varies by fuel type. Lambda=1 at stoichiometric for all fuel types but 14.7:1 afr does not always equal stoichiometric for every fuel type.
I tune my PFM to 0.89-0.92 lambda at WOT full load.
There's a lot of articles online if you want to look at understanding the chemistry more.
Cheers
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