So I have messed with a few 2012-13 Challengers, but trying to fully grasp my Dodge tuning options. I have read several posts but would like to discuss a few things all together. PLEASE correct me if I state something wrong, this is just my current understanding without ever doing most of it yet.
First the desired AFR must be set:
For either of the following two methods you first set your desired fueling by FA (fuel/air) power enrichment vs aircharge table. And I assume the car will use the richer value out of this table and FA PE vs PRatio?
If FA Stoich is 0.068, that means AFR of 14.7 (1/.068). If I want to demand 12.5 AFR (would be .080 using same logic) during power enrichment, my FA PE table is an adder (demand - stoich) and needs to have a 0.012 (which represents .080-.068).
Option 1 - Leave Neural Network (NN) Enabled:
a - set desired AFR
b - adjust by AFR error at Wide Open Throttle (WOT) by
b1. Fuel Mass vs InjPW (if lean by 5% multiply entire table by .95, if rich by 5% then 1.05)
AND
b2. injPW vs Fuel Mass (should be same data as above just swapped, so copy Fuel Mass data and select row_axis>edit and paste into label)
c - if you need to tune fueling by rpm do you have to "fake" this by fudging the FA power enrichment numbers?
d - don't really need to tune part throttle at all after faking injector size? that taken care of by what, trims?
e - don't need to adjust for cold starts most of the time, but if needed FA cold enrich the best place?
Option 2 - Disable NN and use Volumetric Efficiency Tables (VE):
From the few I have seen the factory VE tables need a lot of work. Cold start tables also need work.
a - set desired AFR
b - disable baro learn (has been said to be a complete multiplier for tune and may cause uncontrollable swings)
c - tune entire VE table using short term fuel trims and AFR error (like GM closed loop speed density tuning)
d - Cold start will need more fuel using one of two methods (don't know which is preferred or a good starting point?)
d1. VE ECT factor
OR
d2. FA cold enrich
Please let me know of any errors, and here are a few questions that would help me nail this down so I can update the above:
1. Is there ANY benifit to dialing VE tables in with NN turned off then turning NN back on.
2. Some people say VEs are not used AT ALL with NN enabled, and some just say to a much lesser degree
3. Are the factory VE tables dialed in to work best in NN mode or just really really bad for some reason (what reason?)
4. Car will use the richer value out of FA PE vs aircharge table and FA PE vs PRatio?
5. is that how you adjust Fuel Mass/InjPW with NN enabled?
6. how to tune by rpm with NN enabled, "fake" the FA PE table?
7. prefer VE ECT factor or FA cold enrich for adjusting cold starts in VE mode? and good starting point?
8. are there any other important steps in either method?