The dyno graph below is from a 1996 GTS belonging to FL Johnny GTS . In pull # 2, the calibrator was set at 0/0, a pass through setting that does not alter air / fuel ratio or timing advance from stock. In pull #4, the VEC1 is adjusted to alter the air / fuel ratio and timing advance for increased throttle response on the street and more top end power, which can be seen on the dyno pull.
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