Just a few questions on tuning DFCO for a 2002 LS1 Camaro. My car is bolt ons currently with a 3600 stall, it appears as if I just do not hit DFCO conditions at all as the car always wants to command 14.7 while coasting, foot off the gas on the highway.

so I am trying to get a more aggressive fuel efficient tune on here for the street.

Looking at the DFCO tables, I have some questions/clarification that I need.

Starting under the cutoff, DFCO tab

1) what does hysteresis mean?
2) Enable RPM vs Gear > Entry - is set at 1500 for all gears it says the engine RPM must exceed this value? meaning what- that in order for DFCO to occur, my rpm must be above 1500 rpm while below my throttle threshold?
The exit table is set to 900 and also says it must exceed that value...am I understanding correctly in that the exit number is once that RPM is below that number, you drop out of DFCO?

So in other words, your entry and exit values are your range in which DFCO operates? Hp tuners words this weird in my opinion...

3) my entry Baro is 18 exit is 28 kpa...again is my operating range only in between those values? That seems like a very small window?

4) Can someone better explain the DFCO entry spark threshold? This is the degree spark advance that must be reached to turn the fuel off...what does this mean?

5) we have two spark advance tables- A and B... one is set at 100% tps the other is at 99%...do we not use these tables then?

6) What is the "Stall" mine is set to 800 rpm...


sorry if some of these are dumb questions... my problem is if I don't understand the explanation of each function, I can't strategize or figure out how to best set the car up. I wish Hp tuners had a better glossary/explanation of terms

 

I got it working now, but I have a few questions still.

First for the Enable MAP vs Baro both the entry and exit values must be below the number specified in the table...this has me confused? how do both the entry and exit numbers need to be lower?

Secondly after getting DFCO to work, I unplugged my hp tuners and plugged my aeroforce gauge back in the Camaro which has a function for instant mpg. I took the car for a spin, let off the throttle at highway speeds and before the car enters DFCO I read an instant of about 50-53mpg (still decel just at stoich) then DFCO kicks in and my instant mpg drops to 47-49mpg which is not what I was expecting given I am now cutting fuel and going from 14.7afr to 17's

So that made me look at spark- during decel when dfco is active I am getting an advance of only 2.5-3* of spark whereas I was coming from about 40*...that is a drastic drop is that normal? What should I have my spark be at when in DFCO?