Hi everyone, I have an AU VCT head on EF bottom in my EF Fairmont. I have the VCT wired to the BBM switch. I find with the VCT connected the car runs fine but has no grunt before the switch over point (3,800rpm) and then you can feel it come alive. So i disconnect the VCT connection and it is way gruntier down low with a slight decrease in top end. Does anyone have any ideas what could be causing this problem? Have i joined the 2 wires connecting the VCT to the BBM switch back to front? lol. I have an EF Xr6 ECU running it

Thanks for any advise