Quote:
Originally Posted by Tom Vaught
The EGTs do a fine job. I agree the O2s accuracy depends of the model/ manufacturer used.
There are two basic O2 sensors out there: The Bosch Sensor and the NTK sensor.
The Bosch sensor gives a "general" air/fuel ratio.
The NTK sensor reads ACCURATELY from a 6-1 ACTUAL a/f ratio to several numbers higher than stoich (14.7-1) air/fuel ratios.
Maybe not important for drag strip usage but on a Bonneville 5 mile run very important, or a road race vehicle if EFI.
Or a true street vehicle.
Not sure what a SF bench uses.
Tom V.
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Your information and observations lines up with what I observe in stock passenger applications. The Bosch sensors tend to be a little lazy and the NTK's very fast switching when watching or graphing with a lab scope or scan tool. When making car repairs I try my best to use NTK replacement O2 sensors vs Bosch. The Bosch sensors work but switch rich to lean slow enough to set false catalytic efficiency codes on some cars. On the dyno, I will work with whatever we have. I will still have BSFC, an air hat and other data.
So if you are trying to tune your STREET Bathtub intake and carb set-up, I would always use a NTK sensor system.