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Old 12-04-2010, 06:56 PM   #15
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Originally Posted by JIMNLIN View Post
There is no exhaust brake available for the 6.7 Cummins. As Rusty mentions the 6.7 engine uses a VGT which acts like a exhaust brake with 240 hp for braking.
I believe my 6.7 has the exhaust brake. I thought it was a jake brake. Interesting. It does really slow my 18000lbs down very well and its the first time I've used one. Is this not as good as a Jake Brake or is it better? I have nothing to compare. It sounds killer too and you can hear the turbo kick on when it happens.
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Old 12-25-2010, 01:27 AM   #16
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Has anyone installed one on a Ford 7.3???
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Old 12-25-2010, 07:57 PM   #17
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ford what is a ford
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Old 12-26-2010, 01:20 AM   #18
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Old 01-14-2011, 10:27 PM   #19
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I installed the Jake brake on an 03 Dodge I bought new. Doing the install isn't that bad if you are at all mechanically inclined. Maybe 5 hours work. The 06 I have now I bought used, and it already had the Jake installed.

Comes as a box full of all the parts, for like $1200 from Dodge, and I'm told several hundred cheaper at the Cummins parts house. I believe the 48RE has to have a controller added to keep the TC locked up, but my trucks were both stick shifts, one with the NV5600 and the G56 on my current truck.

There have been treads about the vacuum pump failing, and the previous owner of my 06 had the vacuum pump replaced under warranty. I've had no problems with either Jake setup, but it does seem funny to me to have such a big belt driven vacuum pump just to run one little actuator on the actual brake.

The exhaust brake feature of the variable turbo on the 6.7 is extremely effective with either the G56 stick, or the 68RFE auto.

Anyhoo, if you decide to install the Jake yourself and have any questions...
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Old 01-14-2011, 11:12 PM   #20
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My 01 had the vacuum pump for the brake booster. It wasn't installed for the exhaust brake even though it uses it.
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Old 01-15-2011, 06:04 AM   #21
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My 02 Dodge used the hydroboost system (hydraulic pressure from the power steering pump) for brake and steering assist, but it still came with a vacuum pump as the HVAC controls used vacuum to power the actuators. The Jacobs exhaust brake used this existing vacuum supply for actuation. Starting with the 03 Dodge HDs (the 3rd gen trucks), a vacuum supply no longer exists, so the Jacobs brake kit included an add-on serpentine belt driven vacuum pump. Our current 6.7L has the exhaust brake function built into the variable geometry turbocharger and tied into the truck's computer systems - it's quite effective as when the e-brake is switched on along with tow/haul mode, the harder you brake, the more aggressively the truck downshifts with the exhaust brake engaged to assist in decelerating the truck/trailer.

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