2020 GM/Chevy gas 6.6L max towing test

ls1mike wrote:

ShinerBock wrote:

ls1mike wrote:

ShinerBock wrote:
There should be a caveat with N/A gaser tow ratings such as you loose X pounds of rating every Y feet above elevation instead of just saying it can tow 16,000 lbs. Unless doing 25 mph at 5,000 rpm without any power to pass is your idea of towing.

At the end of the test they were going 2600 RPM at 25 mph. Truck wouldn't downshift. I wonder what would have been different if they put it in manual. To be honest I never put mine in manual, but I have not towed the IKE.

They were screaming at 5,000 rpm most of the way when they were taking the noise measurement and they lost speed when it up-shifted until they got too low and it downshifted to high rpms again. In order to maintain a decent speed, it would have needed to be in the upper 5,000 rpm. That is not my idea of towing. GM should decrease the tow ratings for that altitude.

It was and 5000 RPM is fine for a gasser. That is what they are designed to do. I know some people are uncomfortable with that.
The problem is the further they went the lower rpms went and by the time they hit the top they were at 2600 rpm. I don't know why it wouldn't down shift. In manual you could have. I don't know what algorithm GM is using for down shifting. Thing also needs 4.10s.

I am sure the engine is fine revving at 5k as long as the oil cooler and radiator can keep up that much of a sustained load/heat(some modern gasers can't). I just don't want to hear it. I had to in my 4.6L and it was teeth chattering to hear it scream up and down the hills for 150 miles. Although if you are revving that high for such long periods of time on a regular basis then I would do the severe duty cycle in preventative maintenance.

I would have put it in manual and forced a downshift, and yes it needs 4:10's and a 10 speed.