Downshift or exhaust brake?
I was just thinking after reading a post about gas vs diesel trucks where somebody mentioned they liked diesel because of the exhaust brake. I've never had a diesel, always gas. If I come up to a long...
Forum Discussion
4x4ord wrote:ShinerBock wrote:4x4ord wrote:
As I have already pointed out, my Ford will generate 18 psi boost at 3000 rpm while grade braking without a trailer in tow. My Peterbilt will generate much more boost than that. If a non turbo'ed engine is pumping 5 cfm through an exhaust brake and a turbo'ed engine of the same displacement pumps 10 cfm through its exhaust brake and if both are creating 20 psi back pressure then the turbo'ed engine will be doing twice the braking. I think it is highly unlikely that the Ram isn't using the turbo's potential to create boost to make their exhaust brake as effective as they can. As far as what your guage is displaying, it is possible that it is programmed to show either boost or braking depending on whether the engine is pulling or holding back.
But the braking system in your old year model of Ford is more like a half exhaust brake and half engine brake utilizing exhaust/intake valves instead of just the turbo. I believe the exhaust brake in your new truck may be different.
Super Duty - Exhaust Braking Function
Apples to oranges.
The 18 psi boost that I observed with the Ford was just yesterday in my 2017. My 2011 Ford exhaust brake was not nearly as capable as the new truck.
Well, when I finally drive my truck this weekend I will select turbo boost, turbo vane position, and turbo shaft speed to show up as my parameters to watch on my CTS2 and try to record it while the exhaust brake is applied so you can see what the Cummins EB does.
