Hi,
I read a lot of discussion but I have not yet understood some things.
I purchased a used XT660Z with a PowerCommander V.
I bought O2 Optimizer from OFF-THE-ROAD:

http://www.off-the-road.de/en/O2-Optimizer-XT660.html

Now, I do not know if I have to remap the PCV to set at 0 values in the stock closed loop area (from 2500 to 7000 rpm and from 2 to 40% throttle).
Can anyone guide me step by step installation of O2 Optimizer?

Thank you!!

PS sorry for my english

plug n play. nothing to it.

As above. Just plug it in.

When the injection system is running in the closed loop and the ECU is taking on board information from the O2 sensor (whether stock or with an Optimizer) whatever is in those cells in the PCV will be overridden. Those cells in the PCV map only come into play when the injection ECU mapping is in open loop and, when in the open loop, whatever the PCV fuel trims were before the Optimizer was fitted will apply just the same thereafter.

All the Optimizer does is preset the closed loop fuelling to around the 13.6:1 mark by intercepting and altering the O2 sensors signal to the ECU (without it the preset A/F ratio is a very weak 14.7:1). Having a closed loop of 13.6:1 will more closely match what the PCV is tune to run in the open loop (usually 13.2-13.6:1) so you don't get any ugly flat spots, surging or nasty big steps in the transition between closed and open loop.

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Thank you Pleiades, now I think I have a pretty good idea.