roni4g63

iTrader: (1)

Hey guys, just trying to grasp onto why there is always upwards of 40 degrees of timing advance from 10-70 load cells even in high rpms? thanks for responding ahead of time!

ronaldo9

iTrader: (2)

I suggest you read up on MBT or Maximum Brake Torque. More or less the minimum amount of ignition timing to create the maximum amount of engine torque increase.

Raptord

iTrader: (10)

The air-fuel mixture burns slower at lower pressure, meaning you need to start off the ignition event earlier (IE more advanced timing) than you would if the pressure was higher.

roni4g63

iTrader: (1)

makes perfect sense, thank you for this, so why do some tuners take some timing away in these low pressure areas? Could it be due to stroker applications?

Raptord

iTrader: (10)

Depends on which areas. If you're talking about ~4.5k+ rpm and low load, that's because some people find that keeping the timing low between WOT gear changes helps prevent shift knock, by having smaller timing swings. IE avoiding going from ~10°, to ~35, then back to ~5-6° in a very short time.