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The curves presented here for users that feel competent enough to select a curve for tuning purposes. Keep in mind that engines run for prolonged periods in an over-advance condition will overheat and/or damage pistons! The safest approach is to start with the straight-line curve suitable for the volumetric efficiency of the engine, then step to the next curve in the family when you are assured it can take more advance.

These are the advance curves that are programmed into the 123/Mini:

28 Degree curve family 

30 Degree curve family

32 Degree curve family

34 Degree curve family

These are the advance curves that are programmed into the 123/GB-4 and GB-6:

27 Degree curve family 

30 Degree curve family

33 Degree curve family

36 Degree curve family

 

 

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Last updated: October 18, 2006.