Originally Posted by Garage19
I'm no expert but i should imagine to map ignition for off boost you would just hold a specific load/speed site and then advance/retard the ignition timing until you achieved the best torque reading????? Any tips Stu? Do det cans make it possible or is it mostly down to experience?
Yes, but at part load you have the complication that some cars simply run terribly with too much advance and never begin to detonate or preignite. This is commonly a problem seen on many of the old 7.2:1 cossie maps ive seen taht run like a bad joke off boost. Someones just put the expected advance figures in and hoped for the best and recieved rather less..rolfol.
I use a fuel monitor that can display oxygen values as well, so i can map to teh point of oxygen content appearing in teh waste gas. This will indictae a missfire before i can feel one.
Other than running problems, we map to detonation and then back, but in all honesty, experience gives better results than det cans off load as a low comp motor will swallow up advance and just run crap, effecting driveability and emissions terribly.. thats a fact.
We also map with our G-Meter at times so we can measure constant G. This is a good way to gauge improvements in torque whilst mapping live.