Cam angle tables
The cam angle tables contain the target cam angle for both the low and high speed cams.
The target cam angle should be zero around the idle area.
Deceleration VTC Angle
The default behaviour of the ECU is to return to cam to 0 degrees when the throttle is released (during deceleration or decel fuel cut), except in the 2012 Civic Si which will return the cam a target cam angle of 5 degrees when above 4000 RPM. This may be undesirable when changing gear as the cam will return to 0 degrees when the throttle is released, and then take some time to return to normal VTC angle once the next gear is engaged (typically 20-30 degrees at part throttle). Most engines make significant less power if the cam is below 20 degrees or so, so this is undesirable.
Cam returning to zero while shifting gear
It is possible to set the cam angle during decel and/or use the normal table lookup for VTC angle during decel.
Zero VTC upon decel fuel cut.
This is the default behaviour. Uncheck to allow the
VTC decel fuel cut angle.
If 'Use VTC tables upon decel fuel cut' is not available, set the VTC decel fuel cut angle to an intermediate angle which gives smooth shifting between part throttle and full throttle. Typically 20-30 degrees works well. Note that if Use VTC tables is selected, this setting is overwritten.
Use VTC tables upon decel fuel cut
If available, check this to use the normal VTC tables upon deceleration.
Example Settings
Disable Zero VTC, enable Use VTC tables.
Recommended settings for VTC table lookup
Zero the idle area; set column 1 and 2 to an intermediate angle (15-35, typically 20-25).
If using the VTC tables during decel, make sure the idle area is 0
VTC will not have to advance from zero when shifting.
VTC angle while shifting gear using VTC tables
VTC Closed Loop Control
The cam is controlled using a closed loop with PID parameters. For some vehicles it is necessary to change there values.
Note that this will not fix mechanical problems.