Quote:
Originally Posted by sperry
Am I going to need the front and rear stock O2 sensors? Or does it just use the second one for checking for cat efficiency?
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The front one is the main one it uses for closed loop. I have read that the rear one does some minor trimming too ( along with cat. eff.), but the front one is the one to log. Also log the fuel learning #1 & #2 along with MAF voltage. In closed loop you want the learning to be near zero and you tweak the MAF table to get there. To tune the lower end of the MAF table (what you need to pass smog) I usually log idle and a few progressive part-throttle runs staying in closed loop (less than 5psi boost or so). Then I put the logs in Excel and make some graphs of total learning versus MAF voltage. Focus on trends and ignore noise. Call me if you want to discuss or need help.
*** Stay out of open loop until the Hydra is back on.