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techtalk:evo:engctl01 [2020/01/10 06:46] ixl2relax [Sub-Documents] |
techtalk:evo:engctl01 [2020/02/16 07:43] ixl2relax [Sub-Documents] |
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| - | ===== Aftermarket Ignitions ===== | + | |
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| * The VOES has two connections and one adjusting screw. The VOES is connected to the carb (manifold side) through a vacuum hose and monitors the manifold vacuum level. It is also connected to the ICM. It has two black wires from the internal switch. From the inline connector, there is a (purple or purple/white) single wire sent to the ICM and a second wire sent to ground. The VOES switching point is set by a concealed screw. This causes the ICM to switch between the two advance curves based on a set point level of manifold vacuum. | * The VOES has two connections and one adjusting screw. The VOES is connected to the carb (manifold side) through a vacuum hose and monitors the manifold vacuum level. It is also connected to the ICM. It has two black wires from the internal switch. From the inline connector, there is a (purple or purple/white) single wire sent to the ICM and a second wire sent to ground. The VOES switching point is set by a concealed screw. This causes the ICM to switch between the two advance curves based on a set point level of manifold vacuum. | ||
| * The adjusting screw is inside a sealed opening on the VOES. You must dig out the silicone sealing compound in order to make any adjustments. Remember - When testing your adjustments, you must also seal that opening with your thumb (or other air-tight sealing compound or tape) in order to prevent air leakage through the screw adjuster cavity. | * The adjusting screw is inside a sealed opening on the VOES. You must dig out the silicone sealing compound in order to make any adjustments. Remember - When testing your adjustments, you must also seal that opening with your thumb (or other air-tight sealing compound or tape) in order to prevent air leakage through the screw adjuster cavity. | ||
| - | * The only function of the VOES is to switch between the two advance curves that are programed into the ICM. Different ignition modules have different curves. Those curves have anywhere from 5 to 18 degrees difference in the advance settings between them. But that's another discussion. | + | * The only function of the VOES is to switch between the two advance curves that are programed into the ICM. Different ignition modules have a different set of 2 curves. Those two curves have anywhere from 5 to 18 degrees difference in the advance settings between them. But that's another discussion. |
| * The manifold vacuum directly controls the VOES, but the throttle position (and/or it's aggressive changes) indirectly alters the VOES (thru changes in the manifold vacuum) by altering the carburetor throttle plate. | * The manifold vacuum directly controls the VOES, but the throttle position (and/or it's aggressive changes) indirectly alters the VOES (thru changes in the manifold vacuum) by altering the carburetor throttle plate. | ||
| * When the engine is running at idle, when lightly accelerating or when using a steady cruise throttle, manifold vacuum is high (the throttle plate is mostly closed) and the VOES switch is ON, causing the ICM to use the MORE ADVANCED CURVE. | * When the engine is running at idle, when lightly accelerating or when using a steady cruise throttle, manifold vacuum is high (the throttle plate is mostly closed) and the VOES switch is ON, causing the ICM to use the MORE ADVANCED CURVE. | ||
