ive got the dual one which is spec R? i dunno anyways ive set my ration to 45% and gain to 12%. and limited boost to 11 psi, just do a kpa conversion on google, i think its like 0.75 or something like that. I used a website that guides you in setting it up but i cant find it now.
the jist is you have 4 settings right so you road tune your car in incraments so you start of with say 10 gain and set up your ratios to 30, 35, 40, 45 in the 4 presets. when you road test you just compare the diff between the 4 settings. going too high will overboost and you will hit R&R
the gain theoretically determins how fast the turbo spools up. i personally found going a higher gain for me say 15 did make it spool faster but for some reason it wasnt delivering it to the wheels so i settled for 12.
hope that helps ya. remember this is all from memory so to cover my ass do it at your own risk...lol