Whats the difference between the motor in the A8(300hp) and the R8(430hp). I watched SuperCars Exposed and they said they're both 4.2 Dohc V8's. So why does the R8 put out 130hp more? Can you make an A8 put out 430? I found this info but I still can't see that big of a difference.


2009 Audi R8 Base Coupe Performance & Efficiency Standard Features
4,163 cc 4.2 liters V 8 mid engine with 84.5 mm bore, 92.8 mm stroke, 12.5 compression ratio, double overhead cam, variable valve timing/camshaft and four valves per cylinder
Premium unleaded fuel 91
Gasoline direct injection fuel system
23.8 gallon main premium unleaded fuel tank 19.8
Power: 313 kW , 420 HP SAE @ 7,800 rpm; 317 ft lb , 430 Nm @ 4,500 rpm


1998 Audi A8 Base Sedan Performance & Efficiency Standard Features
4,172 cc 4.2 liters 8 V front longitudinal engine with 84.5 mm bore, 93 mm stroke, 10.8 compression ratio, light alloy block, light alloy head, double overhead cam and four valves per cylinder
Premium unleaded fuel
Fuel economy EPA highway (l/100km): 9.4
Multi-point injection fuel system
90 liter fuel tank
Power: 224 kW , 300 HP @ 6,000 rpm; 295 ft lb , 400 Nm @ 3,300 rpm
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