Hi friends. I have just completed assembling my quad -
Reptile 500 quadvoptrr frame
Kk2.1 board
Sunny Sky 2212 980 kv motors
2200 mah battery

Can anyone please suggest the best PI settinga that any one has tried?

Hi Rusty,
Every quad is different and required the gain tuning of its own. Copying other's gains will not serve the purpose. Take out the quad to some ground and try tuning the gains. The adv. of KK2.1 board is you can change the gains on the spot. No need for any computer connection. Go through the internet you will find hundreds of documents and videos of how to tune gains for KK boards. Try to understand what are the effects of different gains.
Here are few from KK2.0. I guess 2.1 is similar:



http://www.rcproreviews.com/kk2-0-flight-controller-setup-and-settings/
http://www.hobbyking.com/hobbyking/store/uploads/914113709X883063X42.pdf
http://oddcopter.com/kk2-0-configurations-with-pi-settings/?postid=66
Here's some good info from RC India forum:
http://www.rcindia.org/multirotors/tuning-my-new-kk2-quadcopter/
Hope this helps.