2020 GM/Chevy gas 6.6L max towing test

ls1mike wrote:

ShinerBock wrote:

ls1mike wrote:

Lynnmor wrote:

jfritz_drfritz wrote:

I wonder if it fails to downshift because at that altitude the engine doesn’t generate enough torque for the transmission to sense a downshift point

I wonder if sensors saw high temperatures after miles of full throttle and dialed back the power to save the engine or transmission.

In this video and the 2017 gasser video they mention all temps were in spec.

But that is just it. It could have defueled or cut power to keep the temps within spec. Diesel do the same thing. The Ram 6.4L did it as well the last Ike run they had. This 6.6L could have forced the truck into lower rpms to keep the temps at safe levels.

Right, but that is not a parameter in the transmission field. There are something close to 450 parameters for the 6L80E/6L90E. For the 6L80E and 6L90E time and pressure are the tow big ones. I will hook up the Laptop next time I tow and see. I don't remember reading about or being able to mess defueling in the program. I have HP Tuners. That thing is great if you understand it. It has really woke the Caprice up with the cam swap. I don't plan on messing with the truck at all. It is a great diagnostic tool too. Like I know guys who remove torque management. Not really worth it to me, I don't feel like rebuilding the 6L80E in the Caprice every other season.

You may not be able to all perimeters depending on the software or tuning tool you are using. I know I can see more perimeters with my EFI Live software than I can with my MM3. EFI Live is by far the best when it comes to how many parameters it can view/alter especially when it comes to GM vehicles.