General Information

Continuously Variable Valve Timing (VVT)

Cam control, otherwise known as VVT, CVVT, VVTi, VANOS and various other names is a technique used by manufacturers to modify an engines valve timing while the engine is running. Unlike older systems where the valve timing could be switched between one of two settings (eg early VTEC and MIVEC), VVT allows valve timing to be adjusted anywhere within a fixed range. Link Engine Management gives the expert "tuner" full control of these cams.

Variable Cam (VVT) Dyno Plot

This dyno graph clearly shows the advantages of controlling cams. Here's a dyno graph of our 1UZFE VVT-i engine (that's a Lexus LS400 for the un-initiated), with the thin red line showing a run with cam control turned off, the green line showing the response with Inlet Runner Control activated, and the thick red one using VVT.