6.7L Cummins Forum

have an 08 3500 with factory exhaust brake ,works okay but would like to get more hold back.was told by the dealer that it is in the turbo,and dodge has no updates for this.anybody know anything about this?am I the first to see a need for this?any help would be appreciated,thanx

Hey bcguy, when I haul my 5th wheel over the Oregon coastal range there are times I never touch my breaks going down steep grades. If fact it slows down so well I need to hit the “diesel” pedal to gain speed. The higher the RPM the more the break works, so at 3000 RPM it’s holding back really well for me. Tow/haul mode will down shift automatically going down hill or do it manually to get the RPM up.

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2008 Dodge 2500HD 6.7L 4X4 Laramie
Edge insight, Amp tailgate step, 4" Boss Bars, rear air bags with compressor, spray in bed liner

What I found for myself is lower rpm / speeds and e-brake on is to down shift the tranny to get the rpm up and then it works very nicely. Very important to have rpms up, the closer the rpms drops to 1200, less effective it becomes. At higher speeds and rpm, I am like Jamespi, truck slows down nicely and have to apply gas pedal to either stay at that speed or speed up.

To do be afraid to get the rpms up, the engines likes it and keeps everything working as it should.

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I don't have anything to add but here's a link explaining how it works. Cummins 6.7L VGT Exhaust Brake Operation

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2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
Click for installs: Carr Steps PML Diff Cover Edge Juice with Attitude Volant Intake Hankook ATM RF10

Exhaust brake works very effectly with tow-haul on

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7.5 3500QC 6.7CTD 68RFE Build date June 2007
Superchips tuner 3808, Boost/EGT Laser Gauge, Airaid cold intake

Tow Haul mode EB on high RPMs nothing else needed.

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Winger
2008 2500 Silver 4x4 6 Speed Auto Big Horn Edition Volant CAI Magnaflow Muff Edge w/ Attitude
1990 Honda GL 1500 Wineberry 125,000 Miles
2005 Honda GL 1800 Candy Blackcherry 50,000 Miles

thanks for the replies guys,I know it works well when revs are up,but at times I could just use a bit more when I am pulling my backhoe,always use tow haul mode,just wondering,It does kind of shock me that I am the only one who is not 100 percent happy with the hold back,still love it,wouldnt trade it for any one of the competition,cheers

I live in Kansas so that may be why I can't complain. Flat, flat, flat............

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2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
Click for installs: Carr Steps PML Diff Cover Edge Juice with Attitude Volant Intake Hankook ATM RF10

We have several trucks, one of which is an 08 5500... if you have the auto transmission you need to have the truck in tow/haul and the truck should do the rest... we are often at gvw 19500 lbs and have to add throttle going down a 6 or 7% grade in the pacific northwest... my other trucks are 5.9's with the pacbrake.. they are the same...

With my 05 3500 dually we can tow a 15K lb trailer the exhaust brake holds the load, I can't see why you shouldn't be able to do this with the 6.7... I'm sure ours would...

If you've got the stick, you need to be 1800 - 2200 rpm for best operation...

What's the gear ratio of the rear end? 3.42 will not have the EB power of a similar equipped truck with 4.10 ratio, so keep that in mind. Also the EB is to assist in Braking on grades not to hold all loads on all hills, you can't expect a truck to maintain 100km per hour down a grade towing 10000lbs in high gear, you might have to use the brakes.