1 second faster at Top Gear Track
3 seconds faster at 13 mile Nurburgring
1.4 seconds slower at Hockenheim short track
2.5 seconds slower at Vairano Handling Track
1 second slower at Oschersleben
1.5 seconds faster at Zolder
Then it appears to handle better in the wet
To me it seems like a slight advantage to the Ford GT.
In GT5 the Time Trials suggest the Ferrari F430 is on average 2 seconds slower at most tracks in GT5P.
However, these Time Trials used incorrect Ford GT weight. The real Ford GT weighs 70kgs more then the one in the game. I estimate 70kgs to be worth around 1 second, or slightly more.
That means in GT5P, the Ford GT, with proper weight, is around 1 second faster per lap then the Ferrari F430, which seems about right, almost perfect.
However, there is two problems
1. Some have raised concerns that the Ferrari F430's real tires are equal to N3 tires while the Ford GT has S1 tires.
2. Even at 1521 kgs, the stock Ford GT has 18 more pp then the stock Ferrari F430. Is 18pp worth just 1 second? 18pp = 210kgs.
I still haven't gotten around to doing testing, but once I do it will be thorough.