Wtf is "Fast TqEx" torque management?

[DSteck]

I've got a 2013 ZL1 A6 with basic bolt ons (NW102, 2.38 upper, ported blower, headers, ID850s) with an odd manual downshift issue. When you tap down, it goes through a Fst TqEx type of torque management. If you don't touch the gas, it is very quick and completes the downshift. If you push the gas while tapping down, it stays in this mode until you let off the gas. The car flips out, has no timing, and gets real lean. I have never seen this before on any A6 car and was curious if anybody knows what this TM style is, or why it seems to stay active of you're in the throttle on downshifting. I suspect it has something to do with the throttle body and the rev matching procedure on downshifts, but can't say for sure.

Just wondering what this type of TM is.

[Ben Charles]

Bump for knowledge

Just curious if you disabled it?

[DSteck]

If I knew what disabled it, I'd probably turn it off. I don't see anything explicitly labeled for it in the calibration, and also don't understand the purpose it serves. I'm more concerned with why it gets stuck in this mode until you let off the gas.

I've emailed support and am awaiting some info, but figured I'd throw it out publicly to see if anyone else knew.

[Waker]

If I knew what disabled it, I'd probably turn it off. I don't see anything explicitly labeled for it in the calibration, and also don't understand the purpose it serves. I'm more concerned with why it gets stuck in this mode until you let off the gas.

I've emailed support and am awaiting some info, but figured I'd throw it out publicly to see if anyone else knew.

You tried tweaking "Spark Minimum Tqt Mgt" to see if it lessens?

[DSteck]

Chris added what I needed. It was cutting fuel delivery.

[Waker]

Chris added what I needed. It was cutting fuel delivery.

Cool, so there is a new Beta?

[DSteck]

809

Think it was only added for 2013 ZL1 though.

[kangsta]

could you post the stock file for the car please?

[DSteck]

See attached.

[kangsta]

thanks

[meatbag]

Ive seen it pop up on other 6L80/90 cars now.

[Chris@HPTuners]

its for blip downshifts on automatic trans. Basically, if the torque due to the blip goes outside the allowed tolerance agreesive torque management will kick in to ensure the vehicle doesn't surge forward.

[kangsta]

whats the parameter called?

[kangsta]

DSteck or Chris, what is the setting that needs to be changed?

[chrisj6]

Anyone had to increase this setting? My 2009 Silverado has surges a lot when coming to a stop after only being in 2nd or 3rd gear, like driving through downtown with lots of stops. This sounds like my answer, but not sure how to tweak it.

[LSx Believer]

I'm having a similar issue as on a 2011 CTS-V. The only time it goes into Fst TqEx*TM is when the car is tapped down. Any gear as soon as it downshifts until the gas pedal is pressed it says in Fst TqEx. I have tried various adjustments, and loading a stock transmission tune with no success. What have you guys done to fix this?

The modifications are:
NW102
4.5" intake
PRC ls3 heads
Gt11 cam
Ported blower
2.5 upper
9.5 lower
Flex fuel

[Dr. Nopps]

D-Steck seems to have just disabled it. Not bacause it was actively working, or just because it existed though. It was only causing problems for him (going lean & timing drop) ONLY under certain conditions that he was specificly scanning for. (tap down shift while however still pressing on the gas pedal a little) He also stated it may have only been added to those ZL1's in the beta so far, so if you actually really need it you may have to generate an infolog while connected to your vehicle and send it in to support, then download the beta after they've added it in.

[Aaron407]

I disabled it on my supercharged G8 GT over a year ago. The biggest issue before disabling was if I manually tapped to downshift and then hit the gas before the shift completed, it would kill all power for 3 or 4 seconds before it would start to return it. In a downshift scenario where you're trying to go faster, a 3 or 4 second delay is an eternity, so I turned it off in my tune. I haven't had any issues with my downshift throttle blips since making the change.

[jtrosky]

I'm assuming that the the parameters involved here are the "Fast Torque Exit" parameters (Enable/Disable delta)? I don't think anyone actually mentioned the parameters that contol this...