Originally Posted by
Hemituna
I dont know if you are trying to make this thing act like a diesel stump puller but it will never do that.
The ETC system on these is to make the pedal FEEL linear....to get a nice, smooth, even flow of torque relative to pedal.
That is why I say you must mess with it till it feels right...you can datalog all you like but that wont tell you what tq you are feeling.
The tq numbers are just that...numbers....they are needed to feed into the systems related to the driveline (engine/trans etc) to get you the tq you are requesting.
It is a request based on percentage of available tq. The tq comes from a (now supercharged) combustion engine (the tq is not linear).
The numbers are there to quantify the tq so the pcm/tcm can make sense of the requested tq.
The trans and the engine work together to satisfy the request.
So when you are at 1500rpm there is not a great deal of tq available (on a 3.6l 4v enginewith peak tq at 5k) so you need to tell it to deliver a high percentage (or all) of available tq at small pedal percents.
After this pedal percentage there is no more tq to satisfy the increasing request so ideally the trans will help out and drop a ratio (or 2), the engine will deliver more tq as will the lower trans ratio.
As you now have more tq from the engine and the trans tq multplication of a lower gear ratio you will FEEL a heap more tq.
The ETC system (if set up correctly) will close the TB at this higher rpm at the same pedal % so tq doesn't ramp up and you have to get out of the pedal (cable style).
Dunno about you but the auto pentastars I do are rarely below 2000rpm unless coasting or at super-light throttle.
It will perform waaaaay better if you utilise the trans/boost and rpm (with a blower peak power is at 7k ish) they are capable of.
Yes they make reasonable tq down low, but they love revs and in a heavy vehicle like a wrangler they go best if you have them rev most all the time.
Pretty sure at 100kmh with stock gearing they run like 2200rpm........keep em in this (1800-2200) zone and above.
They pull pretty good at this rpm with boost but with a bit more pedal it should smoothly unlock the converter or drop a gear and give just a little more acceleration.
If you need further acceleration, more pedal will give you that until again no more is available from the engine and we need more rpm and a lower ratio...a bit more pedal
and the trans will drop another gear and off you go.
It doesnt matter how much boost you feed it at 1500rpm, it will not stay with one that is a gear lower ( tq multiplication) and at 2500rpm.
You dont need anymore tables than are available currently to tune these things to get a wow driving experience....
You do need to work with the system tho and not against it ...I have tried virtually every which way tuning these and this is what I have found drives/performs the best by far.
The small/large tables are the commanded tables, the TB table is what it thinks it is getting from the TB and feeds into the actual airflow/tq numbers ( which are not actually the actual airflow/tq, just the airflow/tq it believes it is getting/making)
I have found best results if small/large are identical and TB table is same/very close to them (you can fudge it sometimes if you are playing with the tq model, but best not to generally tho)