MOTORSPORT NEWS NEW VEHICLES

WORLD DEBUT FOR THE NEW TOYOTA GR SUPRA GT4 CONCEPT AT THE GENEVA MOTOR SHOW

Toyota will present the world debut of the new GR Supra GT4 Concept at the 2019 Geneva Motor Show 5 March.

The car is a design and engineering study that explores how the newly launched fifth generation of the legendary Supra sports car might be developed as a competitive machine for international GT4 racing, accessible and affordable for privateer teams, in line with Toyota’s worldwide support for grass-roots motorsport.

The road-going Toyota GR Supra has essential qualities that make it an attractive proposition for GT4 racing, with its perfectly balanced chassis, two-seater cabin, highly rigid and lightweight body, rear-wheel drive and very low centre of gravity.

The combination of a short wheelbase and wide track gives it an ideal 1.55 ‘golden ratio’ for excellent stability and agility, which are valuable assets in a series where the regulations use a balance of performance calculation (adjusting weight according to engine power) to ensure even competition across the field.

The concept model, developed by Toyota Gazoo Racing, is instantly recognisable as a Supra and maintains the road car’s low, muscular shape, but with increased length and lowered height. A specially-designed front diffuser and rear wing have been added to the GR Supra GT4 Concept to improve airflow around the chassis, reducing drag and optimising downforce. Both items are constructed using composites made from natural fibres such as hemp and flax, replacing the traditional carbon fibre in order to reduce the impact on the environment. The concept is fitted with five-hole OZ 11 x 18-inch racing wheels.

The MacPherson strut front and multilink rear suspension design is carried over, but with the addition of competition springs, shock absorbers and anti-roll bars. The high-power deceleration required for racing is provided by high-performance Brembo brakes.

Under the bonnet, the GR Supra GT4 Concept retains the 3.0-litre straight-six-cylinder petrol engine with single twin-scroll turbocharger, coupled to an automatic transmission. Performance is increased with help from a motorsport-grade ECU and bespoke wiring looms. There are also motorsport-specification drive shafts and limited slip differential.

The stripped-out cabin is fitted with a high-strength roll cage and FIA-standard fire extinguisher and OMP racing seat. The concept car is also equipped with a motorsport-specific fuel tank and a fast refueling system.

GT4 is one of the world’s fastest-growing motorsports categories, with national and regional competitions in Europe, North America, Asia and Oceania. Established since 2006 and sanctioned by the FIA, it is designed to be a value-for-money series for both professional and amateur racers, and a potential stepping-stone to GT3 competition.

Toyota Gazoo Racing will evaluate the interest shown in the Supra GT4 Concept by potential customers before deciding on future development of the vehicle.

Toyota GR Supra GT4 Concept technical specifications

Chassis
Length4,460mm
Width1,855mm
Height1,250mm
WeightNot disclosed at this time
ConstructionSteel body with high-strength roll cage
Front diffuserNatural fibre composite
Rear wingNatural fibre composite
Fuel tankMotorsport specification with fast refuelling system
Driver’s seatFIA-standard OMP racing seat
Engine & transmission
TypeIn-line six-cylinder, single twin-scroll turbocharger
Displacement2,998cc
Max. powerNot disclosed at this time
Max. torqueNot disclosed at this time
TransmissionAutomatic, rear-wheel drive
DifferentialMotorsport-specification limited-slip differential
DriveshaftsMotorsport specification
Suspension, steering & brakes
Front suspensionMacPherson strut
Rear suspensionMultilink
Coil springs, shock absorbers, anti-roll barsMotorsport specification
SteeringElectro-hydraulic, rack and pinion
BrakesBrembo racing brakes
WheelsOZ five-hole 11 x 18in

In Europe demand for the road-going version GR Supra has been high, with the first 900 customers already signed up. In response to this, Chief Engineer Tada-san added: “I can’t wait for the moment when they get behind the wheel, I believe we will reignite the passion and put the fun back into driving for as many people as possible.”