Sorry, somehow I missed this question. I posted a writeup on it in the tech section. Basically it uses the EMR module to pull out 10 degrees timing by grounding a wire, unground it and it goes back to base timing again. So you can have an easy starting high compression engine and have a flatter timing curve and one that is ultimately more controllable and desirable.
It also helps you make a smogger distributor with limited mechanical advance a performance one, as the old performance distributors of yesteryear had lots of mech advance and little vacuum adv. You will likely need to watch your vacuum adv can usage, an adjustable is recommended. As the smogger ones are often 20-25 degrees, if not 30. So if you had a 25 degree initial advance, ground the wire and 15 degrees is your starting timing or nitrous timing, or turbo, etc, then when vacuum adv comes in, adding 25 to it would be too much and hitting upwards 50 degrees. I recommend not to exceed 45 degrees.
You can hook the terminal to a vacuum port with a switch, or a pressure port for boost, or even a line on a nitrous nozzle to automagically ground the distributor before pinging even starts to be an issue.
Really can be a handy dandy addition to a high compression engine or other performance uses.
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Originally Posted by Chrome  I haven't seen anybody ask yet, so what is this trick?
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