The table Mike posted above is a fixed table of when the vvt will be moving and to what extent. The left axis is grams per cylinder of airflow, but you can look at that as another way of saying "load." The other axis is engine rpms, and the data points are the degrees of cam retard the engine is running at for the point it's at. On the timing side things get more complicated and blends things together, but as for the actual camshaft moving, that table above has full control of that point. If you put that table to all 0s, the cam would run full advanced at all times and not move.
As for the vvt position, if the hydraulic pressure fails, the worst that can happen is the cam is locked at full advanced at all times. This is because there is a clock spring that holds the cam under tension in the full advance position. If that spring ever fails, which i have never seen, it is a non interference engine, and there are hard fixed limiters built into the cam phaser that only allow it to move so far. Even if the spring failed and the cam was flopping to full ratarded, the pistons would still not make contact at TDC.
When you do an aftermarket version of a vvt cam, you use limiter blocks to reduce how far the cam phaser can move to maintain piston to valve clearances under a worst case scenario.
Lt1 tuner eh? Did you use tunercat? That was one of the first programs I started with.
As for the vvt position, if the hydraulic pressure fails, the worst that can happen is the cam is locked at full advanced at all times. This is because there is a clock spring that holds the cam under tension in the full advance position. If that spring ever fails, which i have never seen, it is a non interference engine, and there are hard fixed limiters built into the cam phaser that only allow it to move so far. Even if the spring failed and the cam was flopping to full ratarded, the pistons would still not make contact at TDC.
When you do an aftermarket version of a vvt cam, you use limiter blocks to reduce how far the cam phaser can move to maintain piston to valve clearances under a worst case scenario.
Lt1 tuner eh? Did you use tunercat? That was one of the first programs I started with.
