Mystery Torque Defuel

[Killerbee]

Can anyone think of what this non-shift related torque defuel is?

Scratching my head.

LLY stock tranny, (and struggling at this level).

 

[duratothemax]

looks like the same sorts of things my truck does.

 

[IOWA LLY]

Can you say LiLLY....:barf::barf:

 

[IOWA LLY]

Sorry, my internet is acting up. Stormy weather and satellite internet makes me a pain in the ass.

 

[TheBac]

Well, boost and rpm dont change, but TCVDES% (what is that?) goes up instead of down during the event.

What does that mean? Heck, I dont know...

 

[malibu795]

try pids
GM.FUELQ_THR_DMA(mm3)
GM.DMAX_TRQ_DMA(ft-lb)

these relate to base tq and torque limit injection quantity

 

[Fingers]

Is that where your pilot injection is kicking out?

 

[TrentNell]

what ever cammanded it................. it cut pulse and mm3 so ya something defueled

 

[LarryJewell]

there is a new group of pid files Ross posted up on the efi forum to help the LLY's track down varias fueling problems.

The thread is here: http://forum.efilive.com/showthread.php?t=10732


anybody wanting to help out is welcome

 

[MadMooseEngineering]

Is it doing at 4-5 shift cause if it is my truck does something wierd at 4-5 it acts like a double shift but IdahoRob sauses its not the tranny i dont have efilive personally got a tune from Rob and it just started last year towards the end of the race season.

 

[JoshH]

Hey Moose, that isn't a shift. Look at the RPM, it is still climbing, and the MPH is no where near high enough for a 4-5 shift.

 

[Killerbee]

Where the trq dma comes down, pilot is still active.

It appears to coincide with putting the hammer down. Maybe it was an abandoned shift?

 

[LarryJewell]

i've created 3 different pid files for logging, they all have the required 6 parameters Ross wanted, plus several different diesel test pids that Ross created for testing the fueling problems, I dont know if they will give the best results for some help, but I dont mind emailing the files to anybody that wants them.

 

[Killerbee]

The truck is in 4th upon the WOT. 4th slip condition. The 4th lockup event is impending.

On closer look, the log appears to show a defuel for a scheduled 4th gear lockup event. What I think is happening is the lockup event is abandoned, but the defuel remains as scheduled. IOW, it seems to be bad timing for going WOT.

As soon as I unload, there is 2 quick shift events with associated torque defuels. 4th lockup, quickly followed by 5th.

 

[Killerbee]

Well, boost and rpm dont change, but TCVDES% (what is that?) goes up instead of down during the event.

What does that mean? Heck, I dont know...

Tom, it is the vane position, it increases or decreases to modulate commanded boost. It is just along for the ride in this case.

 

[Killerbee]

here is another, with speed scale increased. rpm remains linear, but speed slope increases, so I guess it is a 4th lockup event afterall. Any comments?

 

[MMLMM]

I was thinking about it last night and thought lockup as well. I have seen similar in a recent LLY log.

 

[Killerbee]

During lighter accelerations, this extra lockup torque defuel does not occur. I am guessing because the tranny locks upon shifting to 4th.

 

[Turbotug]

Have you tried altering the RPM/MPH that the lock up should happen at to see if the defuel moves?

 

[Killerbee]

Have not opened the TCM.