ROAD TEST #Audi #MTM #RS6
We drive MTM’s beast. Our European contributor puts the mighty, 211mph MTM RS6 R through its paces on the road…
It was a warm October morning on the banking at Nardo when we did our top speed tests on a bunch of tuner cars, but the atmosphere in the cabin of the #MTM-RS6-R
was cool and comfortable as MTM’s boss, Roland Mayer, rocketed around the 12.5km long high-speed loop to stop the timing clocks at 205.1mph. MTM is no stranger to #Nardo
. The 2007 winner of this top speed shootout event, they brought their RS6 R Avant this time, its twin-turbo V8 wound up from the stock 560 to a whopping 722bhp.
Limited to 305km/h in stock form, this big wagon ran to 329.8 km/h (204.93mph) on day one, and 330.12km/h (205.1mph) on day two. Incidentally, the stock RS6 runs out of puff at 189.1mph.
DRIVEN: MTM RS6 R ROAD TEST
“The tuned twin-turbo V8 delivers real pin-you-to your-seat levels of thrust”
All the tuners provided specifications and performance numbers for their cars, and one of the things we noted was how close the cars got to their claimed top speeds, despite tyre scrub on the banking. The banking at Nardo is designed so that there is no lateral force up to 240km/h. However, over that speed, the onset of lateral g-force adds to the stress on the suspension, wheels and tyres.
On a car capable of 300km/h, you can normally factor in around 10km/h for tyre scrub. As the participants had all established their top speed claims based on runs on a flat autobahn, the fact that many of the cars came very close to their published top speeds on the banking was all the more creditable and highly impressive.
If you give a big, heavy car like the MTM RS6 R enough power and torque, as long as it has tall enough gearing and a decent drag coefficient, a high top speed is a given. On a flat stretch of autobahn, the MTM RS6 R has been clocked at 340km/h or 211.26mph, which makes it faster than the #Ferrari-458-Italia
650S and #Porsche
As impressive a performance as this is, it is actually the raw acceleration of the MTM car that is so remarkable considering that it weights between 400 and 600kg more than the above mentioned supercars.
Thus, while its top speed number was already something to write home about, our collective eyebrows went up even further when we did the acceleration tests. Against the stopwatch, quattro 4WD and the massive slug of turbocharged torque help the MTM wagon to grab the tarmac with all fours, devouring the 0-100km/h (0-62mph) sprint in a sensational 3.38sec.
Fully hooked up out of the starting blocks, it passes 200km/h (124mph) in just 10.98sec, rocketing on to 250km/h (155mph) in 18.72sec. To put that in perspective, it was not that long ago when a car was considered quick if it could get to 160km/h (100mph) in less than 20 seconds.
Being an empirical event where raw numbers count more than anything else, the Nardo top speed shootout was a surreal abstraction from what most enthusiasts would consider owning such a car is about. Thus, my second meeting with the MTM RS6 R on its home ground in Germany a month later for a road drive in everyday conditions was the flipside of the coin. After all, if a car goes really fast on a test track but is a complete misery to drive in normal traffic, then the whole point of tuning it has been missed.
The fact that the current #Audi-A6-C7
iteration of the #RS6-C7
is issued only in #Avant
form, speaks volumes for how Audi and its clientele view the original RS6 concept of a big load-lugger with supercar performance. To purists, the Avant is the defining version of the RS6 formula, and the saloon version of the previous #Audi-A6-#C6
generation was an aberration and a short-lived departure from the path of righteousness.
Thanks to its classic Ur-quattro inspired arch flares, the current #Audi-RS6-Avant
looks muscular out of the box. MTM underline this tough image by filling the big wheel arches to the brim with their 10x21-inch Bimoto style alloys. Wrapped in sticky 295/30ZR21 #Michelin
Pilot Supersport rubber, these forged wheels are much lighter than the optional 21-inch cast alloy factory wheels. This is strange, as the factory stock RS6 comes on 20-inch lightweight forged wheels.
The nine spokes of these big wheels allow plenty of air to circulate around the huge MTM/Brembo brake kit that replaces the factory stoppers on the front axle. Measuring 405x36mm, these massive front discs, clamped by six-pot calipers, are the biggest anchors MTM have in their inventory, and are required to rein in the big horses under the bonnet, which easily overpower the stock 390mm brakes. The factory option of 420mm ceramic brakes is even more expensive, albeit lighter.
The key to this engine’s inherent alacrity is a configuration that places the exhaust manifold and turbos in the Vee between the cylinder banks. This makes the exhaust path as short as it can possibly be, eliminating pumping losses and maintaining full boost pressure in the system.
Apart from improved throttle response, the other main advantage of this design is a significantly smaller and lighter engine package compared to one with the exhausts and turbochargers on the outside. This EA824 V8 engine family motor uses a pair of IHI twin-scroll turbochargers running at a peak boost pressure of 2.3 bars. Maintaining full power in high ambient temperature conditions is another issue, and this is where the intercooling capacity and choice of materials come in. There are also numerous oil coolers for the engine and gearbox to keep heat in check in there too. Handy, considering the power it makes. Factory fresh, the RS6’s 4.0 TFSI bi-turbo engine makes 552bhp and 700Nm. As MTM’s target of over 720bhp and 900Nm of torque was quite clearly outside the realms of an ECU remap, the two turbochargers were internally modified with new impeller wheels and larger scrolls carefully designed to flow more air at the top end without sacrificing the low speed response.
The standard intake was adequate for inhaling the copious amount of ram air required by the tuned engine. But at the other end of the motor, a completely new turbo-back stainless steel exhaust system with larger diameter tubing and 200-cell free-flow metal catalytic convertors, had to be designed and built to help reduce backpressure and expel all the burnt gases more quickly.
Containing throttle valves, the new system ends with twin-pipes on each side, and its lower back-pressure has the added advantage of reducing the thermal load on the engine, all else being equal. Of course all else is not equal, and the significantly greater power and torque outputs can only be achieved by putting a lot more air and fuel through the engine. That means a lot more heat is generated and MTM thus augments the standard water and oil coolers with extra units of their own.
The final part of the equation is the MTM M-Cantronic ECU, which remaps the fuel, ignition, valve timing and boost curves to make full use of the uprated mechanicals. When all is said and done, the output of the twin-turbo V8 shoots up to 722bhp at 5,950rpm, underpinned with 915Nm of torque from 1,700 to 5,500rpm. Another Cantronic ECU module improves the speed and response of the gearbox software, which works in a closed loop with the engine ECU and other sensors.
Around town, the progressive throttle response will meter out the power just like the bog standard car, but when you need to overtake a line of cars on a country road or join the motorway from a slip road, then the MTM modified twin-turbo V8 will deliver real pin-you-to-your-seat levels of thrust. As the deep V8 bellow reaches our ears and tickles your enthusiast senses, the eight-speed automatic seamlessly swaps ratios in the background, giving the impression of one long, solid blast of acceleration. It is an addictive feeling, bolstered by the fact that the quattro AWD enables you to make full use of the massive power and torque all of the time sans the wheel spinning histrionics of rear-wheel drivers of similar power.
Across two generations, starting in 2002 and 2008 respectively, the #Audi-RS6-Avant
carved out a legend for itself that has assured its place in performance car annuls. The formula of roomy estate car with a massively powerful engine, permanent four-wheel drive and unimpeachable build quality is appealing on many levels. It is thus amazing that rival companies have taken over a decade to wake up and smell the roses.
The MTM RS6 R takes this redoubtable formula not just to the next level, but more likely two levels up. The fact that it has the sheer straight-line performance to not just beat, but actually annihilate most of the junior league supercars from rest to beyond their top speeds is the icing on an already very rich cake.
4.0 TFSI twin-turbo V8, MTM M-Cantronic ECU, full MTM exhaust system including downpipes with 200 cell sports cats, and throttle valves, internally modified turbos with uprated impeller wheels and larger scrolls, additional water and oil coolers, carbon engine cover.
Power - 722bhp (claimed)
Torque - 915Nm (claimed)
0-62mph - 3.38sec (claimed)
Top speed - 211.26mph (claimed)
V-Cantronic gearbox software upgrade for faster shifts of the 8-speed Tiptronic gearbox.
MTM / #Brembo
405mm discs with 6-pot calipers.
MTM F-Cantronic (Gen 2) for air suspension, which lowers up to 25mm.
Wheels & Tyres:
alloys with 295/30ZR21 Michelin Pilot Supersport tyres.
MTM mats and various logos
MTM mirror caps and R badges front and rear, carbon diffuser, Nardo graphics
Tuning contacts - MTM www. mtm. Com QS Tuning (UK) www. qstuning. Com
RS6 R VERSUS SUPERCARS...
is a mighty car straight out of the factory, but with some relatively simple tuning it can be transformed into an absolute missile! To put its performance into perspective, here are some supercars that would all be left wanting in a top speed shootout against the 400-600kg heavier, 211mph #MTM-RS6-R
Car #Lamborghini #Huracan