WS6FirebirdTA00

iTrader: (33)

ive been searching and reading about some changing the DFCO limits and what not after cams. is there any need to adjust DFCO for normal driving (after teh tune is complete) or no, leave it stock?

2000TransAm24

iTrader: (2)

I don't see any real need to adjust DFCO limits but it couldn't hurt. The only things I think would need changing after a cam is the Map vs Baro table and your misfire table since a cam generally causes higher Map readings and may cause misfires. I changed my Rpm vs Gear table so DFCO engages at lower speeds(personal preference). I also adjusted my Entry blending vs Rpm table because entering DFCO gave quite a jolt and I wanted entry to be smoother(also personal preference). The only problems I have and can't figure out is when I'm in DFCO and go to hit the brakes my rpms drop below my idle speed, and if I don't go into DFCO and my TQ is locked during deceleration my car will surge. Sometimes it will recover to idle speed quickly and stay there, and others the rpms fluctuate up and down until I come to a stop. The slower I go the more this problem is pronounced.

WS6FirebirdTA00

iTrader: (33)

ok so the main thing to change is the map vs baro? mine is at 18 now, but isnt that for entry, so raising it wont do anything

2000TransAm24

iTrader: (2)

A cam causes higher map readings and your map readings must be below what the map vs baro table says or you wont go into DFCO.

WS6FirebirdTA00

iTrader: (33)

ah i see, so it has to go below there to set dfco, what should i raise them to?

WS6FirebirdTA00

iTrader: (33)

i dont understand this, vs barometric stuff? what is that?

2000TransAm24

iTrader: (2)

I don't understand it either. I just experiment and use what works. The map vs baro is just one of the several qualifications that must be met in order to go into DFCO. Right now I have my entry map set to 44 and my exit map at 54. Does it need to be this high? Probably not but sometimes my car doesn't go into DFCO at its usual time so I just keep adjusting this table higher until the problem seems to go away. By the way you don't need to adjust this table if your car is going into DFCO like it should.

WS6FirebirdTA00

iTrader: (33)

how would i know this, if i hit the dfco FTC?

WS6FirebirdTA00

iTrader: (33)

i think i see now, my map enable was set to 18, so that means unless i went below that dfco wouldnt come on, i get down to about 20-25 so i should set it to 30 kpa, and ext setting about 10 higher to 40? sound about right?

mr2guru

iTrader: (16)

I turned my DCFO off.

WS6FirebirdTA00

iTrader: (33)

i would but id like to save a little gas

2000TransAm24

iTrader: (2)

Sounds good to me.

I can tell while driving. When I let off the gas and start coasting, about 2-3 seconds after coasting I feel a little forward jolt and my wideband goes to about 19 to 1 air fuel and my injectors read 0.

WS6FirebirdTA00

iTrader: (33)

ok thanks, ill check it out

oange ss

iTrader: (50)

what's DFCO ?

WS6FirebirdTA00

iTrader: (33)

deceleration fuel cutoff