Quote:
Originally Posted by RivetED
crispyboy: good point, the newer 10 speeds (X speeds) are great for optimizing the rpms for torque and hp. The downshifting helps but I would miss engine braking.
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Diesels, by design, have no engine braking. Zero, Nada.
Headed downhill, it may as well be in neutral.
So, engineers designed systems to put into the power train that simulate engine braking, the most popular in passenger vehicles is the 'exhaust flap'. A solenoid closes a flapper in the exhaust system, creating back pressure that feels like engine braking. Big semi's use a 'Jake brake' which changes the valve timing, as I understand it. That's why you get the annoying "Brrraaapppp" when a big rig is trying to slow.
Along with the exhaust flap the engine management also shifts down to 4th. This combination makes one feel secure that his diesel has engine braking.
Carry on.