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Volvo Polestar reveals new V8 Supercars engine

Volvo may be better known for turbo fives and inline fours, but in 2005 it launched the XC90 with a new eight-cylinder engine built for it by Yamaha. Fast forward to this past June when Volvo announced its intention to enter Australia's V8 Supercars series, where it would compete with the likes of Ford, Holden, Nissan and Mercedes-AMG. This is the engine with which it intends to do so.
Revealed this weekend at the Sydney 500, this competition-spec powerplant is based on the same B8444S that powered the XC90 and S80 (not to mention the Noble M600), but tuned for racing duty to be shoehorned into the new S60 touring car. The 60-degree aluminum block has been bored out from 4.4 liters to 5.0, its compression ratio boosted to 10:1, modified to run on E85 bio-ethanol and its redline increased to 7500 rpm. Volvo also promises a unique engine note from its new racers.
While Volvo and its racing partner Polestar haven't released official output numbers, regulations call for outputs between 620 and 650 horsepower - in any event, a whole lot more than the 311 hp it produces in stock form. (Noble managed to squeeze that much out of the same block, but that required twin turbochargers while this unit remains naturally aspirated.) Scope out the details in the press release below and the photos from the reveal in the gallery above.

Volvo specs new 450-hp triple-charged four-cylinder engine

When Volvo lifted the veil on the new XC90 a little over a month ago, it announced that all versions would be powered by one engine design: a new 2.0-liter four-cylinder to be offered in various states of tune. That would range, Volvo said, all the way up to a high-output version with "around 400 horsepower," but while it wouldn't specify exact output, now it has.
The new High Performance Drive-E Powertrain incorporates two parallel turbochargers fed by a third electric turbo-compressor. Instead of feeding the cylinders directly, that third unit spools up the twin turbochargers, working together with a dual fuel pump pressurized to 250 bar.
The result is an output of 450 horsepower - far more than the existing 320-hp version and even more than expected. That also works out to 225 hp/liter, far more than the 177 hp/liter boasted by Mercedes-AMG's high-output turbo four and the 139 hp/liter in the Alfa Romeo 4C. Short of a rotary engine (whose actual displacement is the subject of great debate), you'd have to go up to something like the Koenigsegg One:1 (268 hp/liter) to find a higher specific output than what Volvo's boasting here.

Limited-edition Volvo S60 Polestar priced at $59,300*, V60 at $60,900*

You saw their US reveal at this year's Chicago Auto Show and read our driving impressions from Sweden. Now, if you act fast, you can actually own one of the very limited 2015.5 Volvo S60 and V60 Polestar models coming to the United States. The order page for these slick Swedes is now online, but the slots are filling up about as quickly as these cars accelerate.
Volvo plans to build a combined 750 of these Polestar models for the world, but the US is being allocated just 120 of them. Prices start at $59,300 for the S60 or $60,900 for the V60 (*plus a $925 destination charge). The only option is color - either Black Sapphire or Rebel Blue. If rarity is playing a part in your decision, you might want to pick the S60. According to the reservation site, only 20 of the sedans in each color are making it over here; the rest are V60s.
As the top versions of their respective models, both Polestars are packed with features. They share a turbocharged, 3.0-liter inline six-cylinder engine rated at 345 horsepower and 369 pound-feet of torque with a six-speed automatic transmission and a rear-biased all-wheel-drive system. Acceleration to 60 miles per hour is claimed to take 4.7 seconds for the S60 or a tenth more for the V60 with a top speed of 155 mph. They are about more than just a hotter engine, though, with Öhlins shocks, six-piston brake calipers and 20-inch Polestar wheels with Michelin Pilot Super Sport tires. Check out the gallery for the full, official specs, and get to the order page soon, if you decide you need one of these limited Swedish sportsters.