Watching this Autocar first impression video of the new Audi SQ7, I thought to myself - is this the most powerful diesel passenger car in production today?
First of all, I didn't expect the SQ7 to be a diesel, even if there is the SQ5 with 308 and 340 PS diesel V6.
Over the years there have been several extremely powerful passenger car diesel engines, and most came from within the VW group.
Many years ago it was the 300 PS V10 TDI engine which found application in first generation VW Touareg and VW Phaeton. Fast forward several years and we got the lineal successor - equally mad and more powerful 500 PS V12 diesel.
The V12 TDI, despite rumors of use in Audi R8 (that would be a terrible idea), was only powering the Q7. Despite limited use, most people could appreciate the concept of stupidly powerful diesel SUV - even Jeremy Clarkson liked it, and that's saying a lot, knowing Clarkson's opinion on diesel cars in general.
More rational 8 cylinder TDI was also available for Q7, as well as A8 abd VW Touareg, and received numerous upgrades over the years, peaking out at 385 PS.
BMW also participated in this diesel "arms race", most notably with the oddly named m550d. This 3 liter, 3 turbo inline 6 produced 381 PS. The same "tri-turbo" is also used in current X5 and X6 series.
On the other side of Atlantic, where diesel cars are not loved or even understood as in Europe, diesel engine has found acceptance in pick-up truck culture.
These (mostly) non-commercial vehicles can be classified as "passenger cars" and they do offer some very, very powerful "oil burners". Take Ford Powerstroke V8, for example - it comes with all environment-saving features you can think of, yet still puts out 1166 Nm and 450 horsepower.
High torque and always available and sustainable torque is what diesel engines are built for. The 4 liter V8 in Audi SQ7 is another milestone in diesel car advancement.
It produces peak torque at incredible 1000 rpm, and can deliver it with less latency, thanks to new technology - electric compressor that spins up almost instantly, and fills the gap in induction pressure before turbo spools up.
With diesel cars already outnumbering gasoline cars in Europe, it is natural to see them creep into performance segment as well. Especially for large SUVs and luxury sedans where diesel is a "no-brainer" choice for vast majority of buyers.