The GT3 is based on the MP4-12C road car and features the same lightweight carbon fibre MonoCell tub chassis and the same 3.8-litre twin-turbo V8. Since the car is designed for GT-style racing though the car is not allowed to include the McLaren adjustable Chassis Control System, which has been removed.
Other changes over the road car include a new Ricardo paddle-shift gearbox, Bosch Motorsport anti-lock braking system and new Akebono brake calipers. The GT3 also features vast aerodynamic revisions, including a new carbon fibre rear wing, doors which have been moulded to allow for large engine bay intakes in the sides, and a comprehensive flat-underbody kit with wind-cutting front and rear splitters.
McLaren GT Project manager and former race driver, Andrew Kirkaldy, spoke about the progress of the car in a recent report, saying,
"In the first tests, the car is achieving excellent results in many areas including handling, powertrain and other aspects of dynamic performance. The 12C's carbon chassis and aerodynamic efficiency mean we started with a lightweight, dynamically-optimized sports car.
"Those characteristics are fundamental to any race car. The car is around 100mm wider than the standard production car and features a new suspension system which we have tested in the McLaren Simulator. Having now experienced this new set-up in the 12C GT3 car, I’m delighted with the progress we are making."
McLaren has also provided a short video showcasing the McLaren MP4-12C GT3 out on the track. Take a look below.