Ecoboost Speed Density tuning
Alright, I've got a pretty firm grasp on how to manage boost on an Ecoboost. The part that is a bit over my head is the fueling side. Most tunes I've seen from most major shops have not touched the speed density tables at all and rely solely on the closed loop operation to manage fueling. I've been tweaking on my personal Focus ST and I've hit a point where I need more fuel but I look at the speed density tab and cannot put my head around where I need to add my correction. I understand that each point on each table for each mapped point is a quadratic formula that plots a curve to predict fueling. If I need 20% more fuel somewhere, where do I add it? I'm running into a problem where the ECU cannot add the fuel fast enough and it runs lean for a bit before it catches up. I either need to make the PID controller more sensitive and respond faster for making corrections or do it the right way and put the fuel in. If anyone has any insight on how to adjust fueling, please post. I know there have been several posts about this but so far they have all been heavy on the math and no answers on exactly what to do. I'm still waiting on Eric to wrap up the logger for 2015+ Focus ST so I can see which mapped points to add fuel. Please share if you've had success adding fuel via speed density on an Ecoboost. Thanks!