Ariel announced in February 2008 its latest Atom variant, the Ariel Atom 500. It features a 500 horsepower 3.0 litre John Hartley designed V8 engine, carbon fibre body panels and aerofoils, chromoly aerofoil wishbones, integrated function steering wheel, Alcon four-piston brake calipers, and Dymag magnesium wheels. The engine weighs 90 kg (198 lb) and is coupled to a Sadev 6-speed sequential gearbox to cope with the increased power over the Honda unit. During the development process the RS performance engine was replaced by a unit prepared by Hartley Enterprises giving the final production version of the 550 kg (1,213 lb) car 909 bhp/tonne.
Ariel claims this variant will accelerate from 0-60 mph in "less than 2.3 seconds".
Another competitor for the Ariel Atom as top track day machine is a car powered by the same engine (the Hartley V8), but which has the advantage of all wheel drive and better aerodynamics - the DP1: