oange ss

iTrader: (50)

why does the timing table have a dip at or around peak torque ? I have looked over several tune files and they all have that dip around their respect torque peaks. My assumtion was A/F should be fattest at torque peak then lean out for power, but shouldn't the spark graph follow the same pattern ? The graphs I have looked at, timing is high then drops around torque peak then climbs back up at the top. Can anyone explain the logic or dynamics to this ? Is it because of the higher cylinder pressure at the torque peak ? Thanx

horist

for future reference a descriptive subject is a good thing (I normally don't read posts w/useless subjects... but wanted to verify this wasn't spam or anything)

Peak torque = highest cylinder pressure, so you don't need as much advance to get a good explosion