I have also 1000 cc 2007 Belta...
I didn't get which turn u r talking about. Actually we did a lot of experiments on the slopes, even made the car to halt at the steepest slopes while climbing and then again pressed the pedal. The car climbed without going back whereas the manuals go back some distance and then move up even on 1[SUP]st[/SUP] gear. We used S on all slopes, B just for experiment purposes bcoz car climbed every slope in S easily on Pirsohawa, no need for B coz it is for very steep slopes and the car speed also becomes very slow. If at all car halts on S then switch over to B.
(Note : We also experienced that if u change from D to S during a steep climb the car becomes very slow, but if u start ur climb in S then the Car will climb faster comparatively)
Secondly I didn't go to motorway since I bought my Belta. But the fastest I touched is only 120 km/hr till now.
Recommended maximum speed is the maximum speed mentioned on the dial :).. Moreover it’s the road condition or the Traffic police who will decide the maximum speed. For me it’s the speed in which you are confident enough to control ur car effectively or the Car seems to be in control.