At the Detroit Auto Show, Audi pulled out all the stops ... well, some of them, at least. The company's R8 coupe, which had its US introduction at the November, 2006 Los Angeles Auto Show, is an over-$100,000 hardtop which pushes Audi into supercar territory.
The "plain vanilla" and naturally-aspirated gasoline-powered with Audi's quattro system of all-wheel drive R8 comes outfitted with a 4.2 liter aluminum-block V8 making 420 horsepower and 317 pound feet of torque (torque is the "oomph" you feel when you step on the go pedal). All that's enough to push the 3,450-pound car from 0 to 62 miles per hour (100km/h) in just 4.6 seconds; Corvette's most-recent 3,132-pound Z06, 318 pounds less than the concept Audi V12 TDI, with a massive 7.0 liter V8, moves from 0 to 60 in (97 km/h) in 3.7 seconds. (Photo above -- Audi's R8 at the November, 2006 Los Angeles Auto Show and it was an instant hit, photo by Steve Parker; Below --- Audi's TDI concept).
But apparently that wasn't "good enough" for the engineers from Ingolstadt ... So, in their on- going effort to make Americans think "nice" about diesel engines, because a glut of them are about to land on the USA's soil from Europe and Japan, Audi has shoe-horned a twin-turbo, twin-intercooler 6.0 liter version of their 5.5 liter, 650+ horsepower V12 TDI turbodiesel racing engine in an R8; that's the same basic engine which for the past two years won the "24 Hours of LeMans", the world's most-important endurance race. As used in the R8, the V12 turbodiesel makes 500 horsepower and 737 foot pounds of torque.
"TDI" is the name Audi (and Volkswagen) give to their "clean diesel" technology engines (Mercedes is using "Bluetec"; all these engines use technology developed in tandem by those three companies), which will enter the USA later this year with a 3.0 liter TDI V6 available in Audi's Q7, what we think is the best-looking SUV on the road, anywhere. Audi also makes a V8 4.2 liter TDI powerplant, and both are sold in Europe in several Audi models. (Photo -- Audi's "LeMans" concept at the 2003 Tokyo Motor Show, basis for the R8, photo by Steve Parker).
The concept R8 V12 TDI is a great way to educate Americans about the power, longevity and performance potential of today's modern diesel engines. With over 60% of all vehicles, cars and trucks, sold in Europe equipped with diesel engines, and with Europe Euro 6 emissions standards, expected to go into effect in 2014, diesels are a world away from what most Americans remember from the clanky Mercedes-Benz diesels of years past.
Leave it to General Motors to have left a bad odor and taste for all things diesel into Americans' minds. From 1978 through 1985, GM put poorly-built diesel engines into some Oldsmobile (and you know what happened to them!) and Cadillac models. In fact, The Cadillac diesel V8 was America 's first production passenger-car diesel engine, and was an option on every 1979 Cadillac. GM took a huge bet and, rather than build new diesel engines from the ground up, the company decided to use engine blocks made for gasoline engines, and essentially create a new top-end for these powerplants, but leave the bottom-end alone. Oldsmobile offered three different diesels, two V8s and a V6, while Cadillac used only the largest of those two V8 engines.
Some of you can guess what happened. The explosions which occur at the top end of every engine, gas or diesel, are nonetheless much more powerful in diesels. The combination of diesel top-end and gasoline bottom-end forced pistons, rods and scores of other parts from these diesel engine's cylinders right through the bottom end of the engines, taking along pieces of crankshafts just for good measure.
GM wound up having to replace every one of those diesel engines; the replacement was a GM gasoline engine. That attempt by GM to make car engines which could produce better mileage than their gasoline cousins was a complete failure, and something many Americans, and definitely every Car Nut, remembers to this day. "Diesel" became a dirty word in America.
But European manufacturers continued with their decades-long process of constantly refining the diesel engine, to the point now where the clean, modern, powerful and quiet diesel engines from that part of the world will be on-sale in America from Mercedes-Benz, Volkswagen and Audi and probably several others within the next five years.
Domestic car- and truck-makers already have their own diesels, which they use in some of their full-size pickup and SUV models. Many of them use outside vendors for making their diesels, including International Truck and Engine and Navistar. Saturn is due for a diesel perhaps later this year, and all other GM divisions are talking about and planning diesels for several of their models. (Photo --- Audi R10 endurance racer; V12 turbodiesel makes 650+ horsepower).
A type of modern powerplant which lends itself well to an updating with the tried-and-true diesel engine is a hybrid system; in this case combining electric batteries used to power a vehicle's wheels and all other ancillary systems on and in the car or truck, combined with a small diesel engine used to recharge the batteries and keep them at a constant state of being ready-to-use. The "dual mode hybrid transmission" developed by GM, BMW and Daimler, adds power from electric motors to the transmission itself, adding power when needed. While gasoline engines are found in the Chevy and GMC trucks equipped with these dual mode trannies now, GM says it will not be difficult to substitute a diesel engine for the gasoline one, and those trucks will come online soon. (Photo --- Cut-away of the Audi twin-turbo 5.5 liter 650+ horsepower racing engine which has won LeMans twice ... so far).
Many people don't realize that submarines (the non-nuclear types) and huge locomotives as well as some engines on huge ocean-going ships all utilize diesel/electric hybrids of some type, and have done so, quite successfully, too, for almost 100 years.
Audi plans to have newly-developed diesels in many of their vehicles on-sale in the US within the next few years. Under the hood of Audi's amazingly uninteresting concept car called "Cross Cabriolet" at the recent Los Angeles Auto Show was a Volkswagen-built 3.0 liter TDI diesel V6 producing 236 horsepower and 369 foot pounds of torque. That engine will be available beginning sometime late in 2008 in the US in Audi's Q7 SUV; the new Audi A4 will follow with the same powerplant sometime in the year after the Q7 SUV diesel is on-sale.
The R8 concept really has too many outstanding features on it, from a magnetic ride control system to ceramic brakes to a superfast six speed transmission paddle shift system to really do it justice. Will Audi's R8 ever come from the factory with a diesel engine? We wouldn't bet on it, but the thought of a strong, dependable, quiet, longlived and clean diesel in their Q7 SUV ... Now that's something we could definitely get behind!
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