Quote:
Originally Posted by Kroggers
Because the signal from the pre-cat o2 sensors is used by the dme to adjust the air / fuel mixture. At the moment my car is running in open loop, which is not giving the best ratios at best, and will make the car run lean at worst.
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Yes the DME uses the signal from the O2 sensor to adjust air/fuel mixture.
But it does that to regulate the temperature of the catalytic converters.
O2 sensors and fuel trims are about catalytic converter performance.
Not engine performance or power.
If this is a race car I assume you removed the Catalytic converters.
If you did remove the catalytic converters then your O2 sensors are serving no purpose.
Open loop fuel maps will work just as well or possibly better for power.
14.7-1 is the best ratio for lower emissions.
Not the best ratio for power.
Narrow band O2 sensors as used in these car are not very accurate at anything but 14.7-1
Also they don't even measure outside of about 1% away from 14.7-1