Third O2 to measure AFR?
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Third O2 to measure AFR? Would an O2 sensor after the Y give an accurate reading of AFR? I ask because my friend has an AFR gauge, and I'm sure I can find some O2 sensor for fairly cheap that outputs that signal. I figure if a third O2 after the Y would give me an accurate reading, it would help me with tuning my car better. Instead of having to buy an ALDL cable for $65-80 :\
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Would an O2 sensor after the Y give an accurate reading of AFR? I ask because my friend has an AFR gauge, and I'm sure I can find some O2 sensor for fairly cheap that outputs that signal. I figure if a third O2 after the Y would give me an accurate reading, it would help me with tuning my car better. Instead of having to buy an ALDL cable for $65-80 :\
Sounds like you thoroughly researched this solution?
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To be useful for tuning you will need many 'accurate' readings. Things like RPM, IAT, Engine Temp, Map, etc...
So IF this guage were to provide an accurate measurment of AFR that data would need to be collected with the other engine data parameters to be useful for engine tuning.
So IF this guage were to provide an accurate measurment of AFR that data would need to be collected with the other engine data parameters to be useful for engine tuning.
Last edited by BattleShip; Jun 9, 2008 at 08:06 AM.
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Battle, my scanner gives live readings for all those things you mentioned. And it's not hard to either have a friend drive while I look at it, or I drive while he looks at it.
a wideband 02 sensor is as cheap as a narrowband 02. I believe most bosch wideband 02s are like $50-60 each. However the additional hardware and software needed to read that wideband is where the additional cost comes from
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Verdad Gallardo I thought there was a link on here to a fairly cheap wideband AFR setup for like $150 or so? I can't remember the name of it though. I mainly use rpm in the wideband kit my friend has. I datalog at the same time for the MAP and other values.
I've been told as long as the tune is fairly close (in terms of both sides having the BLMS nearest to each other as possible, and it running good) that only one was needed and it didn't matter if it was downstream of both banks, or just on one bank's side.
