Quote:
Originally Posted by Dyno
Not wanting to hijack the thread, but has anyone compared the A/F ratio with the O2 sensor off a header tube compared to the sensor in the collector? If the collector sensor reads and corrects to 13.0, is the header tube reading 12.5 or 13.5 for example?
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I did this with an EFI car I was driving within the last year. We always tuned the collector to 13.0:1, and I realized the primary tubes were all around 12.5:1. However, the sensor used by the Holley is an NTK, and the sensors for the RacePak are Bosch sensors, so results may be different if the sensors are of the same mfg. Generally it seems that whichever tube is most directly in line with the sensor in the collector, that will have the most influence on the reading.