Me Again wrote:
I wonder how the new direct injection gas engines are doing that have no butterfly valve? Audi, BMW and Mini Cooper all have engines in production with DI.
Back to grade braking! For some reason the V8 diesels in GM and Ford trucks held back better than the Cummins I6 did in the RAMs. Maybe it was the much heavier rotating mass of the Cummins. I know from experience with my 2001.5 RAM that when I had just the smart controller on to keep the torque converter locked with the exhaust brake off, that the engine just free wheeled down grades without hardly any hold back. Chris
Direct injection gas engines still have a throttle butterfly to control air intake.