VTEC switch point

The VTEC switch point is very important for the power curve.

In this example below of a K20A2 with CAI , we switched the VTEC point on at 5200 RPM instead of 5800. This provided a substantial gain in torque and power from 5800 to 6600 rpm - after the old VTEC switch point. The VTEC dip was minimized by switching just before a lowcam 5300 torque peak.

Why? We suspect that the airflow to the engine takes a while to reestablish after the VTEC switch point. The results speak well. About 10 ft/lb and 12 hp gain at 6000 rpm.