Exhaust Brake

[ray1933]

I'm not thinking of buying a 2007. 5 but took a ride in one today with the new auto and was totaly impressed with it.

How does the exhaust brake in this truck work, like the others installed after the turbo or is just done with the transmission down shifting.



I do know that the mileage read out on the overhead would keep me from even thinking of getting one.

 

[jelag]

The new engines have a variable turbo... . the ability of the turbo to adjust makes one turbo do a better job at different rpm ranges... . this same ability allows it to restrict the air flow through the engine as well... . this restriction will make the turbo become an exhaust brake... . so for a few dollars the put a switch on the dash, and change the software in the computer... .

I'm guessing all the trucks will have the software all they need is the switch tied into the wiring harness to tell the computer to turn on the brake...

 

[JoelMartin]

Jelag, if you don't mind me asking what is the price on an 08 5500? Edited: Never mind I saw your other post that I hadn't seen yet. Sorry

 

[J&LRam]

the new variable vane turbo with a sliding nozzle , which restricts the exhaust as a regular EB does, has around 240 hp for braking as compared to the old exhaust brakes 170 hp. My neighbor lady [longhauler/hotshoter] just bought a 3500 DRW CC to replace her '03 3500 DRW flatbed HO NV5600 with 370000 miles. She says the rear wheels jump up and down [trying to lock up] in 3rd gear and 2600 rpm on pavement. Serious braking for a serious gal.

JIM

 

[TKeeler]

I'm not thinking of buying a 2007. 5 but took a ride in one today with the new auto and was totaly impressed with it.

How does the exhaust brake in this truck work, like the others installed after the turbo or is just done with the transmission down shifting.



I do know that the mileage read out on the overhead would keep me from even thinking of getting one.

The exhaust brake works great, I leave mine on all the time even when empty unless of course I forget to turn it on. Once you get used to it being on you notice right away when its not. I wish Dodge would have installed a 'maintained' switch instead of the 'momentary' switch but its not a big deal, I'm just glad they made it standard on the 6. 7.

 

[craiggo]

What is the difference?

The exhaust brake works great, I leave mine on all the time even when empty unless of course I forget to turn it on. Once you get used to it being on you notice right away when its not. I wish Dodge would have installed a 'maintained' switch instead of the 'momentary' switch but its not a big deal, I'm just glad they made it standard on the 6. 7.

How would a maintained button been better?



Craig

 

[marksp]

How would a maintained button been better?



Craig

The switch is a latch (maintain) and not a momentary switch, but it defaults to off when the truck is turned on. I think he means that he would prefer that that switch defaulted to the last selected mode when the truck is cycled off/on.

 

[TKeeler]

The switch is a latch (maintain) and not a momentary switch, but it defaults to off when the truck is turned on. I think he means that he would prefer that that switch defaulted to the last selected mode when the truck is cycled off/on.

I don't have the schematics of the circuits yet but I'll bet that my exhaust brake switch is a 'momentary' and sends a 'momentary' signal to a 'latching' circuit, the switch itself does not mechanically latch into and on or off position. The circuit itself does latch and does toggle on and off with each push of the button along with the very hard to see little indicator light in the switch. The circuit is designed so that when the ignition is shut off it goes off and will only come on again with the ignition on and the button is pushed again, the electric seat heater buttons work basically the same way except they also control the high and low heat to the seats.

 

[craiggo]

Ok, I see what you are saying. Thanks for clarifying.

On another note, do the new ones have electric cooling fans or are they clutch driven?

Craig

 

[NavyDood]

Here's a decent link



www.cummins.com/turbos - VGT

 

[DavidBentley]

Do most folks leave the exhaust brake on all the time? I've only used mine on hills so far. Any disadvantages to leaving it on all the time other then the added noise?

 

[Tom Schuster]

I wasn't sure about having the exhaust brake on my new MegaCab--my husband, Tom, has one on his '01 3500 and it's pretty noisy. But I am liking it more the more I use it. It's not all that noisy. I'm not driving on hills--just 17 miles to town and back.



I, too, wish it stayed on all the time instead of shutting off when the truck is off, but I understand why they did it that way.



Janet (the Mrs. ), happy owner of a 2007. 5 3500 MegaCab

 

[EB]

Must be different on the pickup models, on my cab and chassis once you turn it on, it stays on until you turn it off. It doesn't shut off when you stop and turn off the engine.

 

[BVANR]

Must be different on the pickup models, on my cab and chassis once you turn it on, it stays on until you turn it off. It doesn't shut off when you stop and turn off the engine.

Interesting... on mine (c&c) it is like they describe, goes off when you shut the truck off and needs to be switched on after starting. Must be they changed the switch on later productions??? Either way I only use it loaded, figured I'd save the $2. 80 fuel when I can!

 

[EB]

Could be, mine was one of the first ones out and I had to pay for the exhaust brake feature. Mine stays on all the time.

Interesting... on mine (c&c) it is like they describe, goes off when you shut the truck off and needs to be switched on after starting. Must be they changed the switch on later productions??? Either way I only use it loaded, figured I'd save the $2. 80 fuel when I can!