I have searched the forum without luck. Either the information is not out there or I do not know what to search for... Is there an explanation of what tables do what in the Nissan ECU? I am playing with tuner pro rt, and I see primary and secondary fuel maps (both with knock maps); what is the secondary map for? When is it used? I would just like to see some sort of explanation for the parameters and how they work if it's out there. Thanks!

What you seek is here and there on our forums -- but you will find some excellent information also in the Nistune documentation available here:

http://www.nistune.com/