Changed some of the tables that control Defuel. BO742,743,744 http://mcratracing.com/forum/images/smilies/eek.gif Guess I'll put those back where they were!!! My ATS didnt like that!!!! Does anybody in here change theirs?

Changed some of the tables that control Defuel. BO742,743,744
Guess I'll put those back where they were!!! My ATS didnt like that!!!! Does anybody in here change theirs?

Yup,

They are to be adjusted with caution as you found out..........;)

It is much easier to adjust them in Real Time with a Moates Road Runner ECM.........:cool:

Takes the guess work out of it.

Good Luck,

T:D NY

Yup,

They are to be adjusted with caution as you found out..........;)

It is much easier to adjust them in Real Time with a Moates Road Runner ECM.........:cool:

Takes the guess work out of it.

Good Luck,

T:D NY

Keep rubbing it in!;) The LLY don't have it!:mad: It would be a great tool if it was available.

What are your thoughts on it bobo? Just leave em stock or what? I only made changes to the bottom row but it sure did seem to be HUGE!!

Adjustments as small as .5 will make a great difference, depending on where the adjustment is at. The low torque rows are much more sensitive than the upper torque rows, but still make very noticable changes.

Man it sure is nice when you see a thread like this to open EFI and see what is being talked about. I haven't made any changes there since I have a stock trans.

Anytime that you up the power output, there should be subtle changes to the defuel tables to help the fall-on-its-face syndrome that usually happens. The best way is to log torque, rpm, and tps. Highlight the dips in the torque plot, open the tune, and see where the grey box is at on the tune. Adjust those up for lay-down shifts, or down for flared shifts. Very small adjustments are needed.

Anytime that you up the power output, there should be subtle changes to the defuel tables to help the fall-on-its-face syndrome that usually happens. The best way is to log torque, rpm, and tps. Highlight the dips in the torque plot, open the tune, and see where the grey box is at on the tune. Adjust those up for lay-down shifts, or down for flared shifts. Very small adjustments are needed.Thanks, I'm reading and learning from you guys. I dont get much time to tinker with EFI :(

Yep, you dink with those wrong, and you will end up with an undrivable truck and have to drive the kids 2 miles to school at 5mph in first gear. :D

IIRC, if you want to control the shifting for racing use just the B0744 table, and just do the column at 3200 RPM, and move 5mm at time DOWN to make it shift.

Been awhile. Found the CoPilot or Kennedy TCM worked better anyhow.

I make the changes to the B1105 table, as this seems more stable to adjust. Changing the desired torque correlates directly to the B0744 table. I have had undesireable results changing B0744 and then running tow/haul mode. Shifts at the higher rpm's would flare.

There is no way to tell you concrete values to use to get the best results. You need to tinker with it on your tune to make it the best.

The best I can describe it is this:

For explanation purposes, say your are seeing 100mm3 in your logs at WOT:

The defuel tables relate to the MM3 values you see in your logs and command in your tune. If you build a tune with a 500uS difference between 100mm3 and 90mm3, you will use different defuel values than if the difference at 100mm3 and 90mm3 is 100uS. When you defuel, your rail psi will drop off. That is important because you could fall back one spot on the tune if the rail psi is on the edge of a chart before the defuel event occurs. With that said, lets say your rail psi stays on one chart...at 130MPa....and you command defuel to 90mm3 from 100mm3 on a shift. You can see how the difference in the values on the tune with rail psi sustained at 130MPa at 100mm3 and 90mm3 are going to change the % of defuel you have. Throw into the equation that your rail psi might drop back to 120MPa and you can see how that complicates matters. To make matters more complicated, your RPM changes during a defuel event and you need to know where in the Torque Limited Injection Quantity table the ECM is looking to get the desired MM3 value for the defuel. Hope this helps. Do a lot of logging. You can learn a lot from studying your logs...WOT, part throttle, etc..

I have bumped mine up quite a bit, but i was having a huge defuel event prior to getting the SCIV/1057. (dog nose prints on the windshield) I am still running the torque settings bump up with the new trans. now i need to figure out how to fix the turbo bark when the converter locks.

Neens lb7 modded tune in the repository would give you something to compare too, as it was close to my torque tables.

but as McRat said I think the TCM has alot to do with it and they are not all the same.

I was reviewing some of my track logs and found that the truck lost 1 - 2 mph between the 3-4 and 4-5 shifts. This is why I wanted to cut back on the defuel. I guess 10% :o was a bit much! Thanks for the info guys im gonna stick with baby steps from here on out!!