The F430 is ANYTHING but light, 3197lbs is NOT light, theres more than 0-60mph to determine you said it yourself, Whats the average 1/4mile trap speed of the F430??? Gallardo trapped 12.4 and F430 trapped 12.5 for the motortrend, for 150mph Gallardo did 21.4 while F430 did 23.8. Want more evidence???? Autocar got 11.7 for their Gallardo 1/4 mile and F430 got (gasp!) 12.6! (they did HOWEVER get 21.5 in 150 MPH) but thats still behind Gallardo (21.3), yet the 360 CS OUT ACCELERATES the Gallardo in PGR3 (360CS got 12.4 for 1/4 mile and 23.9 for 0-150)!?!?! One more thing Gallardo was tested on WET track in the TOP GEAR episode and if 4WD IS indeed inferior to RWD in GRIP, how DID the much heavier, much more weight distribution unbalanced, 4 door Audi S4 get a better powlerlap on TOPGEAR than the lighter better handling much acclaimed M3??? Was the Quattro 4WD a factor???? (I'll answer for you, YES!) As for the Murcielago, it would run neck to neck with an F50 or F40, its got the speed, WAY more grip (should I refer to the S4 vs M3 again?) and better brakes, it won't however be an enzo competitor.
P.S Fiorano test track is a little DOWNHILL which means ANY 0-60 or 1/4 times tested on the track was bogus. Viper SRT10 would KILL the Viper GTS ACR, so I wonder why ACR has better ratings than the SRT10
Conclusion: PGR3 ratings are VERY VERY FLAWED! Get it fixed before the game ships or PATCH IT via XBOX LIVE