American tuner Hennessey has released the most potent version of the Australian-built Chevrolet SS yet: the 745kW HPE1000.
The Holden Commodore-based sedan produces a mesmerising 1000 horsepower in the old scale, out-numbering all-but the most exotic supercars on paper.
In order to achieve such brute power, Hennessey replaced the Chevrolet's standard 310kW 6.2-litre LS3 V8 with a 7.0-litre LSX V8. It then added a pair of turbochargers and an intercooler for even more grunt.
The HPE1000 features a long list of additional upgrades. The gearbox has been upgraded to handle the extra power, while forged low-compression pistons, steel connecting rods and a Callies 4340 steel crank also reside under the bonnet. Other major enhancements include a new fuel system and injectors, high-flow air filter, stainless steel exhaust and a new engine management calibration.
Performance times of the HPE1000 are yet to be released but, if the softer Hennessey HPE600 version of the Commodore is any guide, it's going to be a rocket. The HPE600 recorded an 11.84 second quarter mile with the standard 6.2-litre V8.
The HPE1000 is likely to humble the tuning efforts undertaken by HSV in Australia in the form of the 430kW GTS, as well as Walkinshaw's 497kW W497. It also outguns the American-tuned Callaway supercharger kit on paper.
Of course, Hennessey is no backyard tuning operation. Earlier this year, the American performance shop set the record for the world's fastest car with Hennessey Venom, breaking the 431km/h mark set by the Bugatti Veyron Super Sport.
In this part of the world the regular Chevrolet SS is most closely related to the Commodore SS-V Redline. The US model gets more power than the Down Under version's 270kW/530Nm 6.0-litre V8, thanks to its larger HSV-related 6.2-litre V8 worth 310kW/563Nm.
According to reports, the Commodore-based Chevrolet SS is soon to be offered with a manual transmission and magnetic ride control.
-Fairfax News Australia