VDrift's physics engine (which is the work of the Vamos developer Sam Varner) is more advanced than Gran Turismo 2, 3, and 4. I love the Gran Turismo games, but they do have some shortcomings in their physics engine... I'll prove it to you: in GT4, go get a lightweight supercar that's RWD, turbo it up to hundreds of horsepower, equip the tires with the least grip, turn off all driving aids (no TCS, no ABS), go to the parking lot, turn the wheel all the way to the left, and floor it in first gear. Instead of doing crazy donuts and swinging all over the place, your car just calmly and slowly turns in a nice circle. Even though the tires are squealing and smoking, the back end doesn't slip out. It really bugs me, and it's pretty much the reason I started the VDrift project. Gran Turismo does have better car data than we do, though, so their cars probably feel better most of the time, despite our cool physics engine.
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