Quote:
Originally Posted by Kodename47
Unless you hit a dyno, then you can't fine tune enough to tell the difference.
|
Add to that, even with a dyno, you will have a hard time tuning for the actual conditions your engine will see in real life.
Tuning to the tenths of AFR to get most power on a dyno only to have it retard timing once you take it on track/street/whatever-kind-of-driving-you-do seems like a bit waste of time in any case. I'd say tune for least FLKC instead.
Rather run too rich and with little FLKC than the otherway around. Because you can for sure feel the ECU taking out 3-5 deg timing!
From personal experience, going up Kesselchen on the Nordschleife (max gradient over 10%) in 4th and 5th gear the car feels very powerful with max timing and 11.1 AFR and like the engine is only running on 3 cylinders with 12 AFR and -5 deg FLKC.
I'm not saying everyone should target AFR 11.1. That's just what works for me. Tune ignition timing with a reasonable AFR (12ish) under moderate conditions (e.g. do 5 back to back 3rd gear pulls) and make sure it's relative knock free. Then take it to the most extreme conditions that is in your driving profile and if it knocks lower AFR before reducing ignition timing.
At least that method works for me.