In addition to my previous post, I'd like to add to the discussion/knowledge in the thread.
I have to agree that tuning this ECU turned out to be straightforward. Note that I have limited previous experience in moder ECU's.
I've found a thread on hptuners that helps to put the different maps and needed changes into logical order.
From pedal to the wheel, this is said to be the processing order of things. Thanks to GarageBill over for sharing this knowledge at hptuners.
- -You press the accelator pedal, which is converted to a percentage/factor
- -This factor is used to come to a requested engine torque via the "torque at clutch" maps
- -The resulting torque is used to determine a setpoint for requested intake air mass using the setpoint mass airflow (it converts nm to mg/strk)
- -Now the hardware needs to do its thing to get to that setpoint and make the requested torque. Thats done by all sorts of subfunctions like ignition timing manager and the intake flap controllers. Which I don't think you need to touch for a straightforward tune.
- -The actual intake air determined via MAP; converted to mg/strk; is then converted back into nm using the indicated engine torque maps. This is relevant for, among other things, your transmission.
Along the way its necessary to raise certain component protection limiters, mostly for air or exhaust temp, all of which have been mentioned here before.
As far as I have been able to determine pressure upstream throttle and supercharger flow are
not limiters. So don't need to be changed.
Timing and air/fuel ratio should be changed as well for more power or more safety margin.
While I'm oversimplifying things, tuning is getting more air and fuel into the cilinder. Requesting more torque and raising the air limiters seems, at least in my case, to keep the supercharger recirculation flap closed.
Making a tune that really uses all margins in stead of say the 90-95% gains from a simple tune takes a lot more effort and knowledge. If I had to guess, thats why some tuners don't mind sharing the basics but are reluctant to post their more advanced files. Makes sense to me, at least.
Any corrections and additions are welcome, of course.