first off what fuel are ya running in it? 87-90-92-or 94 octane.....the lower the octane, the lower the advance. Lower octane= shorter burn. On 87 octane......advance 4-6.....on mid grade 6-9 and 92 octane 10-13, on 94 octane advance 13 to 15......this is based on stock or close to stock horse power.