The 2ZR-FE (the engine in our Corolla) is VVT-i (Variable Valve Timing with Intelligence)
As well as the 1ZZ-FE, and several other modern Toyota engines. It's basically the Toyota equivalent to Honda's VTEC-i (Valve Timing Electronic Control with Intelligence)
The 2ZZ-GE was the 1.8 L VVTL-i...