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
rhagfo wrote:Me Again wrote:wnjj wrote:
The following is my theory:
Since the restriction is after the exhaust side of the turbo, the turbo vanes themselves sit in a pocket of lower flow, high pressure exhaust. That won’t spin the turbo much. With a traditional engine brake, the full amount of exhaust flows through at high speeds, but is time shifted from the exhaust stroke to just before TDC to provide the maximum resistance under compression.
That is what I am saying. I have the Exhaust HP gauge and the boost gauge both selected on the EVIC screen. Pretty much one or the other, for sure never both up high at the same time.
Chris
Well, I have always understood that you need fuel and load to create boost! You can rev your diesel in neutral all you want and you won’t get boost. Put a load on it and put your foot into it you will get boost. When using an exhaust brake you may have load, but you don’t have fuel.
Add RPMs to your list. We pulled over with our 2001.5 and 29' 5er in New Mexico on 64 just short of the summit. Taking off again on the hill I could not get the turbo to spool up and blacken the mountain. Went around the last corner to a sign stating 10,500 elevation at the summit.
