The Carlin driver took his third win of the season and a double pole position in what he called “the perfect Saturday.”
Voisin said: “It’s been the perfect Saturday, double pole and the race win, I couldn’t really ask for more.
“It was a tricky race, I got a really good start which was very helpful but then I built a little bit of a gap midway through the race and then the Safety Car came out which wasn’t ideal.
“The Safety Car restart was slightly unusual. Then my tyres started to slightly come off so that’s why Tom (Lebbon) started to catch towards the end but I just managed to hang on.”
Voisin also explained the strange nature of the restart during Race 1: “The lights (on the Safety Car) went out later than what they said they would do in the drivers briefing.
“So it kind of caught me off guard I wasn’t expecting it which is why at first we were all with the Safety Car and then towards hairpin 1 it was when I started backing it up.
“Usually I’d do it a lot earlier than that.”
The 20-year-old explained that his great start provided the foundations to claim second place.
Browning said: “It all came from a mega start, the Safety Car restart and the start we’re both pretty good.
“Just got a brilliant launch off the line, I thought I got a little bit sandwiched going into T1 which will be a bit of a spectacle for the tv camera.
“It was little bit risky here and there but glad it worked out.”
Granfors collected fifth place in Race 1 losing valuable points to his championship rival Browning but he still looks forward to Sunday’s races, particularly as the Swedish driver is starting ahead of Browning on the grid.
The Fortec Motorsport driver said after Race 1: “I look forward to tomorrow with the two races starting ahead of him this time, I obviously started a bit further back in this race.
“I think tomorrow we’ve got nothing to lose really, we came into this weekend with P2 (in the championship) P2 is the worst case scenario as well and I think it’s around 25 points between us now.
“So, I’m just going to have to make a full send in the last two races now.”