Quote:
Originally Posted by snbush67
I think that you want to advance timing, so you are adding degrees, no need to add negative values. Vacuum advance helps the engine run smoother, cleaner and more economical at light and partial loads.
Drive the car while monitoring the app dashboard and record the max kph value at light cruise about 3200 rpms. The max value will vary at light cruise and other load conditions.
Set the app to ignore MAP above 2000 rpm. Then add 10-13 degrees of advance to cover the kph values.
If you want to retard timing anywhere in your centrifugal curve then you have to set the distributor static timing at a negative value to start, then write your advance curve with that in mind. So if you set your static timing at -5 degrees then when the app shows 20 degrees it will actually be 15 degrees.
To set a vacuum retard 123 calls it a vacuum retard trick, see directions at https://123ignition.com/support/create-curve-tutorial/
Shane
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Merci pour vos explications je vais regarder celà. Et je reviens vers vous…