There was a diskution about VVTI, and the engine did not make good powerband if you didnt make it varibel.
We did test using stock ECU, and with megasquirt.
We made the megasquirt control the VVTI like normal VVT.
As you se on dyno, it made better powerband with the megasquirt contoling the VVTI.
This was after only 15min tuning on road.
Just info, many give up when they hear VVTI, thinking you cant control it.