Table blending based on VVT cam angle?

[burdickjp]

I'm looking into VVT tuning and am wanting to approach it as thus:
Command VVT full retard. Tune VE and ignition tables
Command VVT full advance. Tune second set of VE and ignition tables
Use cam position as the Y axis of the blend curve between the two tables

I see that cam position isn't one of the available options. Is there a way to drive a general purpose output to be read in as a general purpose input, or some other way of using VVT for this?

[Paul_VR6]

That only can work if your full adv and retard are bookending the ve swings. Generally that is not the case across all rpms.

[burdickjp]

That only can work if your full adv and retard are bookending the ve swings. Generally that is not the case across all rpms.

I see your point. There's no easy way to square the circle of VVT tuning, is there?

[Matt Cramer]

Perhaps it could be done if the code used three tables - full advance, full retard, and optimum angle.

[burdickjp]

At that point it's becoming a 4D table: load, RPM, cam angle, and VE.
I've been trying to decide if a cam angle with respect to RPM blend curve would provide any flexibility. Probably not.

[Paul_VR6]

"Optimum angle" changes a lot though depending on where on the table you are. Optimum for power and efficiency are far apart.

I have had the best luck doing ve and spark with a good guess at optimum vvt and then moving the cam angles around to do what I want then go back to fuel/timing.

Thats easier than k pro where there are a ton of individual tables to tune then you set the vvt where you want it.