Hmm, some potential issues already....
"Single-seater powerhouse Fortec Motorsport is to lobby for a weight break for the Dallara F312 chassis in next year's British Formula 3 Championship.
The current-generation cars will compete alongside older-spec 2008-11 cars in British F3's top class, but Fortec claims that the newer cars are at a significant disadvantage."
http://www.autosport.com/news/report.php/id/110639
Autosport had some comparisons..
Circuit Best 2008-11 time Best 2012-13 time Old/new
Snetterton 1m39.147s (Nasr) 1m41.170s (Harvey) -2.023s
Spa 2m14.101s (Turvey) 2m15.157s (Serralles) -1.056s
Silverstone 1m53.044s (Magnussen) 1m53.680s (Lynn) -0.636s
Brands Hatch 1m17.151s (Ricciardo) 1m17.048s (Harvey) +0.103s
Donington Park 1m23.012s (Nasr) 1m22.590s (Harvey) +0.422s