Originally Posted by swamp2
Go ahead and keep on dreaming.
1 second: sure (however that is in the "noise floor"), 5 seconds: I'd place an enormous wager against it, 9 seconds: keep dreaming and deluding yourself.
It's not dreaming swamp, it's keeping an open mind.
You believe it's not possible to improve a lap time by that much, fair enough and you might be right but I do know that small changes can effect how a car feels and it's that what can make all the difference. In fact the difference between Michelin PS2 and Goodyear F1 tyres on a GTI can make 0.4s on a 58 second lap, the actual grip improvement is possibly nil but the way the car feels and behaves is much nicer with the Goodyear's and you feel more confident to press that bit harder in the knowledge that the car is more predictable on the limit.
Maybe these changes are doing exactly that, making the car more predictable at the limit and thus improving the lap time in the process. It's not always the case that more power or lighter weight is require to improve things, always remember that.