Whats fuel cut read on a pocket logger?

[DJ23GSX]

Just want to know what fuel cut looks like on a pocketlogger? Which readings are affected with fuel cut?

 

[clownface]

i dont really know but i would think that is was the reading that tells about air/fuel ratio.

 

[DJ23GSX]

I would expect to see a change in the o2 volts but i am more interested in what my timing and knock would read. I seem to be having this problem where my o2's zero out and the car pops but my knock stays at 0 and my timing seems to jump up at the same time. I am just trying to figure out weather its a missfire or fuel cut setting in.

 

[kpt4321]

Fuel cut will also show the injector pulsewidth dropping hard.

 

[DJ23GSX]

Thats what is confusing me my duty cycle doesn't drop at all when the o2 volts do.

 

[kpt4321]

Doesn't drop at all? Sometimes you might not see it drop to zero, but that's just because the logger doesn't have great resolution when taking a lot of samples.

If it's not dropping at all, it may be a misfire.

You should be able to tell the difference between fuel cut and a misfire...

 

[DJ23GSX]

Ive changed my plugs, wires a new coil pack and it still happens. Its got to be fuel cut because i put my silencer back in my intake and the boost doesn't creep at much and it doesn't pop anymore. I was just curious if its normal for my duty cycle not to drop and why my timing goes up when the o2's drop.

 

[yo2001]

This might help.

http://www.digitaltuning.com/index.php?pid=params&param=airvolume&type=dsm

"Air Volume:

Range: 0 to 7
This is the number that the ECU uses internally for air flow. It is derived from Air Flow Hz, air temperature, and barometric pressure. This value has far more precision inside the ECU (11 bits) but due to technical reasons, the logger only sees the top digit of the whole value (technically, the top 3 bits). This gives us a visible range of only 0-7. Because the resolution is so poor, Air flow Hz is usually used instead to monitor air flow.
Bench testing has shown that fuel cut seem to occur a few seconds after Air Volume hits 7."

 

[DJ23GSX]

Originally posted by yo2001
This might help.

http://www.digitaltuning.com/index.php?pid=params&param=airvolume&type=dsm

"Air Volume:

Range: 0 to 7
This is the number that the ECU uses internally for air flow. It is derived from Air Flow Hz, air temperature, and barometric pressure. This value has far more precision inside the ECU (11 bits) but due to technical reasons, the logger only sees the top digit of the whole value (technically, the top 3 bits). This gives us a visible range of only 0-7. Because the resolution is so poor, Air flow Hz is usually used instead to monitor air flow.
Bench testing has shown that fuel cut seem to occur a few seconds after Air Volume hits 7."

When it pops its around 5-6 but i have logged runs that high without the pop. I have only seen 6 on a few occasions and have never seen 7. I am begining to believe its fuel cut because it seems to happen much worse in the colder weather than on a warm day. I have hit fuel cut in my talon and it shut my car off i just wasn't sure if there was such a thing as mild fuel cut like i am getting a slight pop and hesitation