Forum Discussion
ShinerBock
Mar 17, 2016Explorer
Bionic Man wrote:
Since we have already taken it off topic............
It is actually not off topic in my opinion since the OP discusses the performance of the Ram's exhaust brake in the very first post, and has brought it up multiple times since then. Also, the brake in full mode will slow you down and downshift IF the exhaust brake is strong enough to do so. If the exhaust brake is not strong enough to slow the truck down in 6th gear in full mode, it will not downshift to slow you down unless you manually do so. If the exhaust brake is strong enough to slow you down in 6th, then it will eventually slow you down enough to force a downshift.
There are also some that I think are a bit confused on how the exhaust brake works. In theory a larger displacement engine like the Cummins should have a higher back pressure psi at the same rpm than a smaller displacement engine like the Duramax and Powerstroke. What will make them slow down the truck differently is what rpm and gear each truck is in since the exhaust brake gets stronger the higher the rpm. If the shifting strategy of the Chevy forces the truck to downshift to 4th gear while the Ram remained in 6th or 5th then of course the Chevy's exhaust brake will be stronger and slow down the truck even more. However, if they were both in the same gear and rpm then the higher displacement engine should have a stronger back pressure and therefor stronger exhaust brake. Since TFL does not manually shift, they are completely reliant on the truck to downshift to keep at a certain which is what auto mode is for, and not full mode.
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