14.7 readin and O2 clamp - Miata Turbo Forum -Boost cars, acquire cats.

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Old 10-20-2008, 11:10 AM   #1
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Default 14.7 readin and O2 clamp

I found this on some thread and had a few questions...

What is the O2 clamp? Is it just the O2 sensor?

Can anyone explain...

[Your ECU will always try to keep your Air/Fuel ratio at 14.7 when in a closed loop. Typically anytime below 3.5-4k or when traveling up steep inclines the ECU will be in a closed loop. This causes a hesitation or stumble when travel back and forth between vacuum and boost. The reason being the ECU wants to see 14.7 while your APFR is dumping in excess fuel at the same time. An easy (a few wires) and safe (no lean tip-in when entering boost) solution is an o2 clamp. Typically they use a pressure switch that is connected into a vacuum line. When the switch sees a certain amount of boost (usually .5psi), they trigger the o2 clamp to trick the ECU into thinking that no extra fuel is being added. This will ensure that all your added fuel will be there when demanded upon and you will get rid of the stumble. ]
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Old 10-20-2008, 11:18 AM   #2
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