Wideband
Wideband
Does anyone know of a wideband A/F gauge for under $200?
Also, if i turn the boost down and want to get good milage for a long trip, I lean the mixture a little, what is typically a safe high limit of A/F, and also for going fast and I richen the mixture, what is typically a safe low limit of A/F?
Also, if i turn the boost down and want to get good milage for a long trip, I lean the mixture a little, what is typically a safe high limit of A/F, and also for going fast and I richen the mixture, what is typically a safe low limit of A/F?
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Joined: May 2005
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From: Canada
Perfect A/F under no load is 14.7. That is the number that represents all of the fuel being burned completely. Going fast is not the problem, higher load is. At max load, you should be down to around 12. Some people go as low as 11.4. With a proper tune, all of this is handled for you. There should be no need to change the mixture to go on the highway. If you don't boost, your A/F will stay in the high MPH area.
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Not sure about cheap widebands... but A/F is pretty important, so you want an accurate one.
Like above, 14.7 is stoichiometric. I think what you may be thinking of is some high fuel efficiency cars run a higher A/F ratio at idle, since the engine really isn't needing to do much work. For cruise I still wouldn't want to lean the mixture out too much. Fuel is what will keep the internal temps in the combustion chamber down.
For going fast... generally the lower the A/F ratio, the safer... but too much fuel and you can wash the cylinder walls (taking the oil off) or foul your spark plugs quickly (carbon biuld up). I wouldn't much over 11.5 for a stock engine, and would prefer about 11.0-11.3 at WOT redline.
Like above, 14.7 is stoichiometric. I think what you may be thinking of is some high fuel efficiency cars run a higher A/F ratio at idle, since the engine really isn't needing to do much work. For cruise I still wouldn't want to lean the mixture out too much. Fuel is what will keep the internal temps in the combustion chamber down.
For going fast... generally the lower the A/F ratio, the safer... but too much fuel and you can wash the cylinder walls (taking the oil off) or foul your spark plugs quickly (carbon biuld up). I wouldn't much over 11.5 for a stock engine, and would prefer about 11.0-11.3 at WOT redline.
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Joined: Oct 2005
Posts: 2,381
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From: NY
/\+1.. I like mine around 11.3-11.5 at full boost and in the winter season. In the summer days then I have mine to compensate around 11.0 -11.2 especially when it is hot. A/F and timing is also depend on what gas you are using so Cali guys may run a little conservative than NE guys were 93 octane is widely available.
I have my zeitronix wideband w/bosch, boost and egt sensors I will be selling soon. Everything for ~$400 including the mount for your defrost vent just to the left of your dash.
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