posted on March 01, 2015 17:01
The current engines used in today's GRC Rallycross racers are some of the highest stressed production based engines in all of Motorsports. Only Import Drag Racing engines see more stress and perhaps no production based race engines not even Time Attack engines are stressed for as long a period of time as Rallycross powerplants.
Breathing through a 45mm restrictor that limits power to "around" 550 hp, the mountune Ford Duratec puts out 625 lb/ft of torque. Because of the restrictor, the Garrett Turbo pumps in 45 plus psi absolute of boost to make that power, generating an amazing 3200 psi of cylinder pressure. To put this in perspective, this is more cylinder pressure than the Audi LMP1 Diesel!
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