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spoonplugger1 wrote:

What would be the purpose of said device? There lots of eengine braking on the CRD already considering that an auto is attached.

I dont really think the engine braking is all that good on the CRD Mine pretty much just revs right up going downhill, even with the OD off. It is my understanding and experience that diesel engines by nature do not provide much engine braking as there is no restriction on the air intake like there is on a gasser.

We do have the EGR FCV and perhaps if it is closed it could provide some restriction but that is a crapshoot because it may be wide open when you would want it closed, and even when it is closed the EGR valve would more than likely be open allowing gasses to be pulled through it that port thereby reducing engine braking effect regardless.

Someone please set me straight if I am off target with my thinking.

Author:	Wobbly [ Mon Feb 12, 2007 2:37 pm ]
Post subject:	Exhaust Brake
Probably a theoretical exercise, but here's the response from an exhaust brake manufacturer, US Gear: "Thank you for your message about the D-Celerator Diesel Exhaust Brake. We have never had a request for an application for a Jeep Liberty Diesel. Whether you could use one would depend on the back pressure limit of the engine, the diameter of the exhaust pipe, and whether there is 11" of straight pipe ahead of the muffler where the exhaust brake would be installed." Anyone know the maximum allowable back pressure, pipe diameter, and if there's room for the exhaust brake? Wobbly

Author:	Endurance [ Mon Feb 12, 2007 2:41 pm ]
Post subject:
That would be so awesome!!

Author:	MrMopar64 [ Mon Feb 12, 2007 5:11 pm ]
Post subject:
Exhaust back pressure shall not exceed 400mbar in any circumstance. Pipe diameter @ turbo should be 2.25-2.5". Room, possibly. However, the exhaust valvesprings are not strong enough to withstand the back pressure from the exhaust brake, and the Garrett VGT has not been tested in such a condition. Whatever warranty you have would be voided by installation of such a device...

Author:	spoonplugger1 [ Mon Feb 12, 2007 5:26 pm ]
Post subject:
What would be the purpose of said device? There lots of eengine braking on the CRD already considering that an auto is attached.

Author:	tjkj2002 [ Mon Feb 12, 2007 5:29 pm ]
Post subject:
Quote: spoonplugger1 What would be the purpose of said device? There lots of eengine braking on the CRD already considering that an auto is attached To help stop a heavy load while saving your brakes.

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Author:	W3CSX [ Mon Feb 12, 2007 5:51 pm ]
Post subject:
I thought you couldn't put service brakes on diesels with a catalytic converter.

Author:	Jeger [ Mon Feb 12, 2007 6:05 pm ]
Post subject:
spoonplugger1 wrote: What would be the purpose of said device? There lots of eengine braking on the CRD already considering that an auto is attached. I dont really think the engine braking is all that good on the CRD Mine pretty much just revs right up going downhill, even with the OD off. It is my understanding and experience that diesel engines by nature do not provide much engine braking as there is no restriction on the air intake like there is on a gasser. We do have the EGR FCV and perhaps if it is closed it could provide some restriction but that is a crapshoot because it may be wide open when you would want it closed, and even when it is closed the EGR valve would more than likely be open allowing gasses to be pulled through it that port thereby reducing engine braking effect regardless. Someone please set me straight if I am off target with my thinking.

Author:	BVCRD [ Mon Feb 12, 2007 6:23 pm ]
Post subject:
Jeger wrote: spoonplugger1 wrote: What would be the purpose of said device? There lots of eengine braking on the CRD already considering that an auto is attached. I dont really think the engine braking is all that good on the CRD Mine pretty much just revs right up going downhill, even with the OD off. It is my understanding and experience that diesel engines by nature do not provide much engine braking as there is no restriction on the air intake like there is on a gasser. We do have the EGR FCV and perhaps if it is closed it could provide some restriction but that is a crapshoot because it may be wide open when you would want it closed, and even when it is closed the EGR valve would more than likely be open allowing gasses to be pulled through it that port thereby reducing engine braking effect regardless. Someone please set me straight if I am off target with my thinking. Mine wants to coast as well. There is one hill that I frequently go down and I have to shut off the CC if I don't want it to downshift to hold the set speed. I usually just turn off the cruise, coast the hill then turn it back on once I'm down.

Author:	BCool [ Mon Feb 12, 2007 6:38 pm ]
Post subject:
I called that manufacturer and spoke with a gentlman there and he said no, don't try it, the liberty should be fine for 5000lbs. I think he is probably right, I don't think he'd recommend it to a big truck person who only wanted to tow 10000 lbs occasionally, its more for the people who tow a lot and heavy. For us we should be fine with just our brakes and trailer brakes. I personally think it would be fun to have, thats why i called them, but I won't do it now. It is expensive too, you could by several sets of pads for the cost.

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