2020 Cummins IKE pull
VIDEO What do you think? (other than graphic error at 18:35 that says GMC DENALI :) ) For me, the time is about what I expected as it is missing a 10 speed auto and has slightly less power than ...
Forum Discussion
Travlingman wrote:Cummins12V98 wrote:
"The computer is applying the wheel brakes both truck and trailer."
How do you know if the brakes were coming on the trailer on this test? Maybe the engine was doing what it needed with the trans?
Right past the 2 minute mark they say that it is using the truck and trailer brakes and also making the lights come on both.
The fact that they state the brakes are being controlled by the computer isn't enough evidence on ts own, as Mr Truck is full of $#!^ half the time but the way truck behaves while they are asking "will it downshift?" is more evidence. Based on their comments and on the video the truck is holding the load back prior to the downshift. If it could hold that kind of weight back prior to the downshift (at about 2000 rpm) strictly via exhaust brake then the downshift would have cause sudden over braking while the turbo adjusted. The fact that the speed before and after the shift is so precise is strong evidence of wheel brakes being utilized. Additionally, to hold 39000 lbs back on a 7% grade would require 377 lbft of torque on the crankshaft in second gear. There is no way an exhaust brake could generate enough back pressure to generate that kind of torque.... the exhaust valves would float before the required back pressure could be reached.
