This particular car will have two tunes, one maxed out, and one as requested by MadBlunted that will match the Le Mans Spitfires as closely as I can manage. This is my personal favorite car in Gran Turismo, simply because I own a Spitfire racer myself, but I am honestly quite disappointed in how it performs online in terms of handling compared to the real world. By this I mean that with any amount of lateral G's the rear slides out, and it becomes nearly impossible to recover cleanly, so a good amount of finesse is needed with throttle and steering inputs.
Fully Prepped:
137Hp, 718Kg, 414Pp
Transmission: 124Mph, Standard Final Gear
LSD: 13/8/15
Ride Height: -13/8
Spring Rate: 6.3/2.4
Dampers (Ext): 6/5
Dampers (Comp): 4/4
Anti-Roll Bars: 5/2
Camber: 2.5/2.1
Toe: -.18/-.16
Brake Balance: 7/5
Tires: RM/RS
Le Mans Tuning:
104Hp, 718Kg, 387Pp
Parts Bought: Stage 3 Weight Reduction, Window Weight Reduction, Chassis Reinforcement, ECU Tuning, Stage 1 Engine, Sports Intake, Racing Air Filter, Titanium Exhaust, Sports Catalytic Converter, Sports Exhaust Manifold, Customizable Transmission/LSD/Suspension, Twin-Plate Clutch, Semi-Racing Flywheel, Carbon Drive Shaft
Transmission: 118Mph, Final Gear - 3.713 (This would be for your general track like Laguna Seca or Grand Valley where top speed is much less a factor than acceleration) For Le Mans itself I would suggest keeping the standard final gear and setting the top speed for 130Mph. On the long straights it should hold steady at 124/5Mph and run times in the low 5 minute range, which is what the ADU Spitfires were running in the 60's
LSD: 11,7,13
Ride Height: -18/4
Spring Rate: 5.6/2.4
Dampers (Ext): 7/5
Dampers (Comp): 3/3
Camber: 2.6/2.2
Toe: -.14/-.37
Brake Balance: 7/5
Tires: RM/RS
With the fully tuned version I was running in the neighborhood of 1:35 on Laguna Seca, and 1:41 with the Le Mans tune just for a frame of reference.