P Mack

iTrader: (6)

A couple people have asked me about fuel trim cells so I thought i'd post up these pictures that have helped me many times in the past.

Notes:
- Some years of cars (like 2000) will have different fuel trim cell rpm boundaries. This was probably done to make sure all rpm ranges learned trims as fast as possible. I changed mine to the way the picture is.

- The term "cold idle" in the second picture (ftc 20) should really be called "open loop idle" since it can be used on hot starts as well; it's used when the o2's are cold and haven't started oscillating yet.

- FTC 22 should really be called "open loop - off idle" because it's used for all open loop driving except idling, including but not limited to WOT.

Feel free to make corrections.

WS6FirebirdTA00

iTrader: (33)

ok so remember my problem at 2:38 (min:sec) logged today to find out thats when i switch from ftc 20 to ftc 19, my o2s DO oscillate up until that area. it would be nice if we coudl figure out the whys and hows of this

CAT3

iTrader: (9)

Very cool layout. What is the second pic from, software or what?

Bill Bowling

iTrader: (6)

The second picture is FlashScan screen.

Bill

WS6FirebirdTA00

iTrader: (33)

so remind me why i got hp tuners now please, lol

WS6FirebirdTA00

iTrader: (33)

mine were oscillating for quite some time before i switched from 20 to 19, and my stft's were working as well while in cell 20

P Mack

iTrader: (6)

Yeah, I don't know how exactly what conditions have to be met (besides ect), maybe they have to oscillate for a certain amount of time or something. That's another good question for the software guys.

WS6FirebirdTA00

iTrader: (33)

also, i got an evap code a while back, 2 times. this could be caused by a evap purge valve purging off. i wonder if these conditions are not normal, maybe that could be why mine stays in 20 during open loop. but the only way to tell is get someone that knows more about this to come in here and answer some questions, which we will have a hard time getting i bet

405HP_Z06

iTrader: (11)

I very often wonder the same thing. I've got to scare up some cash for EFILive!!!!!!

Bill Bowling

iTrader: (6)

I think they are planning a special with money off with trade in's. Go to their web site and keep a look out for the special.

Bill

WS6FirebirdTA00

iTrader: (33)

and bump this one...

02sierraz71_5.3

iTrader: (2)

can we see the rest of ftc graph the rpm range 5600 and up