A look at the extensive testing that goes into every GT3
Road car and Cup car use same engine, similar aero packs
How do you ready a new Porsche 911 GT3 for road and race levels of performance? How about more than 100 hours in the wind tunnel, hundreds of aero simulations, 22,000 hours of engine bench testing, and more than 5,000 km of continuous top speed testing pausing only for gas breaks? That’s what Porsche has done to ready the latest GT3. Here’s a look.
To create the 4.0L flat-six that can make 503 naturally aspirated horsepower and spin to 9,000 rpm before the limiter stops the party, it requires loads of testing. More than 22,000 hours of test rig time, Porsche said. “In total, the engine in the new GT3 ran for more than 22,000 hours on the test rig,” said GT road car engine boss Thomas Mader. “During testing, we repeatedly simulated typical circuit profiles and ran the engine at full throttle for a very high proportion of the time.” It also underwent 600 emissions tests to make sure it hit standards. The road car engine is used “virtually unchanged” in the GT3 Cup car, a testament to performance and reliability.
Keeping the engine oiled during track duty is a dry-sump system that has seven different suctions stages to bring the oil back to the tank. Keeping the crank and bearings greased, the oil pump runs directly to those components first, through the crankshaft.
Starting with the swan-neck wing mount of the 911 RSR, Porsche did around 700 simulations of the effects of small changes to the aerodynamics of the car. They then spent 160 hours proving them in the wind tunnel, which Porsche said means more downforce as well as better-balanced downforce conditions. That rear wing can be set to dour different angles of attack, likewise the front diffuser for balance. 50 percent more downforce at 200 km/h can be boosted to 150 percent more with everything set to maximum.
Lastly, to make sure everything works in the real world, the car was run for more than 5,000 km continuously around the Nardo circuit in Italy. The car saw a constant speed of 300 km/h and stopped only for gas, meaning at least 16 hours of flat-out top speed work and what might have been the longest and most boring track day ever.
The new 911 GT3 is set to start deliveries in May.