Just wondering, I want the fuel cut-off to kick in but I'm having difficulty understanding what DFCO disable RPM Decrease Threshold is, stock its set to 6250 RPM/sec, I can go as low as 250 RPM/Sec, where do I want it set if I want the DFCO to kick in? Also the DFCO Enable MPH Threshold is set stock at 8MPH, does this mean the DFCO will work anything above 8mph or blow ? lol, things like Enable MPA & disable map I think I understand, I have enable map at 40kpa & disable at 42kpa, so anything below 40kpa I figure it'll enable & when the car starts to slow down & map reaches 42kpa it'll disable.

Also my enable RPM Threshold is 3k & disable is 1350 rpm, so my big consern is what I want to set the DFCO Disable RPM Descrease Threshold to for RPM/Sec & MPH enable threshold.

LMK guys thanx.

 

I think you would have a better chance with this on the "Computer...." forum. If its not already there, I'll move it. If it is, I'll close this one.

 

I don't think I've ever seen an explanation of how the DFCO tables work in conjunction with each other.
If you figure it out I'd love to know what each does.

 

Ok cool I figured it all out, I couldn't get the settings right because for a while there I was using the wrong revesion file to edit the table, good thing I didn't mess other thigns up, I looked at a few revision B files, & there shortly after went to edit one of my own without switching to revision EE LOL. But yeah, I got my DFCO kicking in at all times its awesome, can't wait to see the gas milage LOL

 

Think you could explain to me how each table works and what it does?

 

sure, well you have the KPA enable threshold & disable threshold, the enable on mine is set to 38 & disable at 41, reason they are high is because I have a big cam, when you change your cam you have to alter this because a big cam cruises & when you decel doesn't get as low of MAP kpa readigs, you can see a good example by your idle MAP readings which with mine are almost 60kpa while a stock cam idles at like 40kpa, stock settings for dfco enable were like 22kpa & disable at 25, how often does your big cam hit that? umm.. like barely ever.

Now, the enable threshold being at 38 means when map readings hit 38 & below the DFCO kicks in, as the car slows down the map comes back up because your not deceling as fast, so once the map comes to about 41 or so it'll disable the map. There is also the rpm factor, I have my enable set to 1400 rpm & disable at 1350, meaning that that if the MAP readings are hit above 1400rpm DFCO will kick in, & if you hit 41kpa map or 1350rpm it'll disable whichever comes first.

You also have your Disable decel rpm/sec factor, this means if say you set it at 2000rpm, if you decel faster then 2000rpm per second the DFCO will shot off, if you could care less you set it to like 5000rpm & that table will be ignored, I have mine set at 3000 so its pretty much ignored unless I downshift into the wrong gear by mistake DFCO won't kick in.

You also have your timer which you may or may not have in your program as a feature, the timer means how long of a delay you have to have before the DFCO kick in while in the right parameters of map/rpm, if you set it to ZERO, you get off the gas & your are in the right map /rpm readgins to enable it'll kick in instantly, if you have it at 1 second, it'll kick in 1 second laster.

You also have your enable dfco MPH, meaning that if you set it to 13mph, anything below 13mph DFCO won't turn on.

You also have your decel timing retard, leave that as is & it should be fine, that just means how much timing to retard when deceling, this is solely to prevent knock when the fuel kicks in, to have a smooth transition.

You also have your DFCO TPS enable, meaning that DFCO won't kick in even if all parameters are right but you are still on the throttle, if you set it to enable at 5% TPS @2000rpm & all parameters are met but you are still on the throttle at say 4% just coasting along it'll start to decel & won't stop deceling until you hit above 5% tps or whatever you put in there, you must know, even if you select 5%tps & its deceling but you give here 4% tps it'll still keep the fuel shut off but the car's rate of decel will be less because the blades are opening which creates less vacume so the engine brake isn't as efficient.

Its very simple, just refer to this when you are palying around, I'm just explaining the uses for it so its a long story.

This DFCO is also a factor as to why gas milage suffers with big cams, simply cuz you never hit DFCO cuz of less vacume with large cams the DFCO never kicks in while with a stock cam dfco is always kicking in while deceling. Small things all make a difference, I'm already doing better on my gas milage, I'll post how much more gasmilage I got from this tank after its empty

Matt

 

Thanks! Excellent info.