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Ever heard of an O2 Clamp?
Ok... I'm in need of a little electronic device. This thing takes the O2 signal before it enters the ECU, and then sends an output to the ECU. What it does is this: under 0psi (vacuum and atmospheric pressure) it sends the O2 signal to the ECU without doing anything to it. But once under boost, the device sends an adjustable voltage which would represent an ideal fuel mixture (around 0.47v) to the ECU, which prevents the ECU pulling out fuel that has been added with a fuel computer such as an EManage. This unit would probably have a connection for a vacuum hose carrying manifold pressure, and a few electrical connections.
Does anyone know of any companies that produce something like this? I know Flyin' Miata has something available, but I don't feel like paying the $100usd they are asking for such a simple device. Thanks for the help. |
can't say I have seen any local.....
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Why not just run it in open loop?
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If you were tuned right, wouldent your 02s show an ideal fuel mixture, regardless of boost/power output? I mean if you were stoich at WOT would the 02 not still see ~.47v? (or whatever voltage is specific to your ECU?)
Im just saying that if the 02s are that out, you could probably take that as an off-tune issue and not just handicap the 02 sensor that is telling you, you are off-tune. Does that make sense?
Originally Posted by B6T
Ok... I'm in need of a little electronic device. This thing takes the O2 signal before it enters the ECU, and then sends an output to the ECU. What it does is this: under 0psi (vacuum and atmospheric pressure) it sends the O2 signal to the ECU without doing anything to it. But once under boost, the device sends an adjustable voltage which would represent an ideal fuel mixture (around 0.47v) to the ECU, which prevents the ECU pulling out fuel that has been added with a fuel computer such as an EManage. This unit would probably have a connection for a vacuum hose carrying manifold pressure, and a few electrical connections.
Does anyone know of any companies that produce something like this? I know Flyin' Miata has something available, but I don't feel like paying the $100usd they are asking for such a simple device. Thanks for the help. |
Originally Posted by Fast Eddie
If you were tuned right, wouldent your 02s show an ideal fuel mixture, regardless of boost/power output? I mean if you were stoich at WOT would the 02 not still see ~.47v? (or whatever voltage is specific to your ECU?)
Im just saying that if the 02s are that out, you could probably take that as an off-tune issue and not just handicap the 02 sensor that is telling you, you are off-tune. Does that make sense? At WOT with a forced induction car, you want the AF ratio to be richer then a normally aspirated car. It's an easy way to prevent detonation, which occurs much easier in a turbocharged car. Since I'm running a richer AF ratio, the O2 sensor will read this and try to correct it because it doesn't correspond with the ideal NA air fuel ratio that it is tuned for. |
Ahhh, you are a forced induction NA. That makes sense.
Still you can probably push it to the limit of its correction and then go further. My ECU will correct +-40 points. so i lean out my low trim to 140 and then if i go leaner, the ecu cant self-correct any further. Dont know how timing would react to that on an NA ECU though.... |
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