Audi’s R8 was already fast enough to embarrass supercars costing twice as much, which did not stop German tuner MTM from unveiling a 5-liter biturbo version at Geneva in 2011 and then spending two years making it substantially wilder. By 2013 the GT version was making 802 horsepower and running to 223 mph. Read on for what MTM changed, and why the chassis work mattered more than the engine.
There is a specific kind of restlessness that afflicts people who own genuinely fast cars. The R8 was already a mid-engined, all-wheel-drive supercar with a Lamborghini-derived V10 and a chassis that flattered anyone who got in it, and yet a certain category of owner looked at it and thought, reasonably enough, that there was room to go further. German tuner MTM agreed. What they unveiled at the Geneva Motor Show in 2011 started a two-year development arc that ended somewhere most factory supercars of the period could not follow, and the finished car’s most impressive numbers are not the ones on the engine.
MTM and the Business of Improving on Ingolstadt
MTM has spent decades operating in the space between Audi’s engineering department and physics, and the 5-liter Biturbo R8 is the company’s showcase. The approach was characteristically thorough: rather than simply raising boost on a stock architecture, the build reworked the powertrain comprehensively while leaving the exterior and cabin almost untouched. That restraint is deliberate. A car like this is not meant to advertise itself in a parking lot. It is meant to be unremarkable at a standstill and completely unreasonable everywhere else, which is a very specific kind of appeal.
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802 Horsepower, 892 Newton-Meters, Three Seconds
By 2013 the Biturbo with the GT option was developing 802 horsepower (589.87 kW) with 892 Nm (657 lb-ft) of torque available across a genuinely usable band from 2,750 to 6,280 rpm, running 0 to 100 km/h in three seconds flat and a top speed north of 358.9 km/h (223 mph). The torque figure is the one that tells the real story. Peak power numbers make headlines, but a 657 lb-ft plateau starting under 3,000 rpm is what makes a car feel violent in ordinary driving rather than only at the top of third gear. This is not a car that requires a racetrack to demonstrate the point.
Chassis Work: The Part That Actually Made It Usable
The chassis work is what separates a serious build from an irresponsible one, and MTM did not skip it. The R8 V10 chassis gained three-way adjustability, letting an owner actually dial the car in rather than accept a single compromise setting. Wheels went to 9×20 inches at the front and 12.6×20 inches at the rear, shod with Michelin Sport Cup tires, and braking was upgraded with dimpled rotors and eight-piston calipers. Given that the car could reach 223 mph, the brake package is not a cosmetic upgrade. It is the component that makes the rest of the specification defensible.
The 4.2 FSI Quattro and Audi’s Own Recipe
Underneath all of this sits Audi’s own recipe, and it deserves its own accounting. The R8 Coupe 4.2 FSI quattro used the signature all-wheel-drive system with a rear-biased split, sending roughly 30 percent of power forward and 70 percent to the rear. Its all-aluminum, 32-valve 4.2-liter V8 was reworked for 2010, featuring dry sump lubrication, two chain-driven overhead camshafts per bank and variable valve timing on both intake and exhaust. The dry sump matters more than it sounds: it allows the engine to sit lower in the chassis and keeps oil pressure stable under sustained cornering loads that would starve a conventional wet-sump design.
R tronic, S tronic and the Transmission Question
Transmission choice was a real decision rather than a formality. Buyers could take a six-speed manual sourced from Lamborghini, with the exposed gate that became one of the R8’s signature details, or the Audi R tronic seven-speed semi-automatic, which could be shifted manually or left in auto mode. The R tronic is a single-clutch automated manual with no clutch pedal, and its shift character divided owners sharply. Audi’s answer was the seven-speed S tronic dual-clutch, which arrived with the 2012 facelift and finally gave the R8 the shift quality the chassis always deserved, resolving most of the complaints. If you are shopping a used R8 from this era, that distinction is worth more attention than the color.
The Spyder and the Case for the Slower One
The Spyder is the version people talk themselves out of and then regret. The R8 Spyder 4.2 FSI quattro for 2011 came with the 4.2-liter V8 rated at 430 bhp (316 kW), good for 0 to 100 km/h in about 4.8 seconds and a top speed of 299 km/h (186 mph). The alternative was the 525-horsepower 5.2-liter V10, which cut that to roughly 4.1 seconds and 313 km/h (195 mph), and it is the one worth holding out for. Both used the R tronic transmission, and the electric folding cloth top was standard. Losing a few tenths in exchange for direct access to one of the best-sounding engines of the era is, for a lot of owners, an obviously correct trade.
The R8 TDI Le Mans: The V12 That Never Happened
The most interesting R8 of all never reached production. The R8 TDI Le Mans was a road-legal V12 diesel concept shown in 2008, finished in bright red with rhombus-patterned coverings over the air inlets and outlets, a roof carrying two large transparent inserts with a NACA duct mounted between them, and a carbon fiber-lined engine compartment behind the front seats with a glazed face so the V12 was visible. It wore a continuous aluminum spoiler lip and LED headlights, and the cabin featured a three-spoke manganese steering wheel, leather seats and extensive aluminum trim. Braking used six-piston aluminum calipers up front with fixed units at the rear, clamping vented carbon fiber reinforced silicon carbide discs. Audi ultimately shelved it over the projected retail price.
The Diesel Supercar Fork Audi Never Took
That decision is worth sitting with, because it marks a fork the industry never went back to. Audi had just spent years dominating Le Mans with diesel prototypes, and the TDI Le Mans concept was the logical road-going conclusion of that program: enormous torque, genuine efficiency, and a V12 that would have had no direct competitor at any price. The economics did not work, emissions regulation was about to get considerably less friendly to diesel performance cars, and the project died. What survives is the naturally aspirated V8 and V10 line that made the R8 famous, and the specialist builds like MTM’s Biturbo that pushed it well past what Ingolstadt was willing to sign off on. The most technically audacious R8 ever built exists only as a handful of show cars and a lingering question about what the diesel supercar era might have looked like if the numbers had come out differently.
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