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
ShinerBock wrote:4x4ord wrote:
I don't know why both gauges don't read at the same time on your Ram. Maybe the gauges are set up to either show boost or braking depending on throttle position but never both? I know the boost gauge rises very significantly when I use the Jake Brake on my Peterbilt. The harder it works the higher the boost goes. In the case of these small diesels that use the vanes on the exhaust turbine to create back pressure I think the turbo is going to be set as aggressive as possible when its creating maximum braking..... at that point it should be making boost. I think the boost guage rises on my little Ford but I haven't used it much for towing yet. I'll pay more attention this summer.
But your Jake brake is an engine brake that utilizes the opening of exhaust valve during the compression stroke alowing that air to speed up your turbine and his exhaust brake utilizes a sliding nozzle to block exhaust going to the turbine.
I've never seen the exhaust brake on the newer diesels nor do I know how they work but it would make sense to utilize the turbo turbine to restrict the flow of exhaust and increase the boost pressure. Like I said earlier the boost pressure rises dramatically during engine braking on my Peterbilt. Again without knowing anything about the design of these pickups I don't know why, if they use some kind of nozzle, don't they direct the flow of exhaust through the nozzle at the turbine to speed it up?
