6.7 Exhaust Brake

[ejlbuild]

I just got a 07. 5 with the 6. 7 QC/68RFE 4x4, I am wondering if the Exhaust brake is working correctly. I have it in tow/haul but it doesn't engage until about 30mph and then disengages at 25mph. This is on the flat and on steep hills. The trans doesn't down shift because of the brake. The owners manual says that the brake will engage as soon as the throttle is released, doesn't happen. Has anyone had this problem and results. Thanks ejlbuild



07. 5 3500 srw QC 4x4-04. 5 3500 DRW 6sp 4x4,-90 350 4x4 5spDRW

 

[SBreaux]

EB trials

EJ,



On my '07, the EB will not work below 1100 rpm. I don't run in tow haul mode, but I also believe the exhaust temp needs to be at least 175 degrees also. Not to sure about that one, but rpm is confirmed.



You can turn it on when you first start the engine and hear the difference in the motor idling with EB on or off. I wish I knew a way to make the EB stay on by default instead of turning it on always.



SB

 

[Garlic]

On mine, it is slow to react when the temp is low (engine and ambient) I have not noticed a difference in the engine sound when it is warming up, how ever when the truck is in gear and the MPH is 0 and RPM's at idle it does sound different with it on and off. If the brake is activated (service/foot) the trans will down shift more aggressively. I tdoes seem to come on over 30 and shut off 2nd gear at 1100 RPM's. I use my Eb all of the time and use T/H most of the time. (My wife hates it) too many things going on by themselves and an unpredictable down shift (She has never really paid attention to how it works)

 

[RDick]

Exhaust Brake

Just returned from my Dodge dealer; was concerned about my EB working also. He gave me a copy of the service information from Chrysler and stated to keep the RPMs up to 1800, but I agree with the last Thread of 1100; that is about when mine kicks in. Here is the information from Chrysler:



" TURBOCHARGER EXHAUST BRAKE FUNCTION "



"The VGT works in conjunction with the engine and the transmission to provide an integrated braking system used to help slow the vehicle. This is commonly called exhaust braking. This braking power is achieved by modulating the turbo sliding nozzle ring to restrict the flow of exhaust gases from the engine, which in turn creates a high back pressure on the engine. The high back pressure creates a high level of resistance to the motion of the pistons within the engine and this resistance is used to reduce engine speed and thus vehicle speed.



The exhaust brake feature will only function when the driver turns the exhaust brake switch to the on position. Once the switch is in the on position and the vehicle is moving faster than 5 MPH; the exhaust brake will automatically operate when the driver removes pressure from the throttle pedal allowing the engine to see 0% throttle and 0 fuel delivery.



Exhaust braking is most effective when the engine RPM is higher. The automatic transmission has been programmed to downshift more aggressively when the exhaust brake is enabled to increase brake performance. Use of automatic transmission Tow/Haul Mode improves interaction between the engine and transmission. Inputs to the exhaust brake feature include:



Coolant temperature

Ambient air temperature

Exhaust manifold pressure sensor

Throttle pedal position sensor



Fault codes with any of these sensors will cause the exhaust brake feature to be disabled.



The exhaust brake feature can also be used to reduce the engine warm up time. To use the exhaust brake as a warm-up device, the vehicle must be moving less than 5 MPH, the exhaust brake switch must be in the on position, and the coolant temperature must be below 180 degrees F and ambient temperature below 60 degrees F. "





Hope this will help . . . This is right from the Horses mouth,



Ronnie