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PostPosted: Thu Jun 14, 2007 2:23 am 
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chrispitude wrote:
The CRD is a marvelous machine once you fix the many engineering flaws that DCX handed us. We really like it now that we don't have the old torque converter lockup problem, with the ORM "fix", and soon with the Suncoast TC (should be picking it up tomorrow). The Liberty CRD had the potential to be much more than what was delivered to us. Fortunately with this forum, we are slowly addressing these limitations with our own time and money.

However, DCX did indeed lose sales in the long run, at least from us. When we saw the Grand Cherokee CRD, my wife and I both thought of the same line at the same time:

"Fool me once, shame on you. Fool me twice, shame on me."

We are waiting for the V6 TDI Touareg to come to the states for the 2009 model year. 27mpg mixed and a 7700lb towing capacity - gotta love a drivetrain with some real engineering and careful design.

- Chris




There is no way in hell I'd buy a Grand Cherokee CRD. Its twice the price of a CRD but no where near twice the value; heck it even has less leg & head room.

My made the KJ CRD such a value is that you could get a midsize 4WD diesel truck for less than $25k. If DC had put the VM 2.8 into the Dakota they would have had hit a home run.

If you upgraded the breaks and rear diff. on your CRD you could tow 7k.

My understanding is that the V6 TDI is a whole new drivetrain. I'd wait at least 1 model year for the flaws (if any) to surface. It seems like some people with an 05 CRD got to be paying Beta testers, as a whole the 06 folk had a better experience.

I'm more interested in the Diesel Accord thats in the pipeline as well as if/when Subaru brings their boxer diesel to the US.


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PostPosted: Thu Jun 14, 2007 3:17 am 
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Threeweight wrote:
I think the goal of the design of the stock CRD box was to try and get some kind of half-assed "ram air" effect going, using the position of the opening in the grill and the flow of air around the Liberty at highway speeds to boost the availability of air to the engine. When I pulled it, my filter had bits of dried grass, dead bugs, and dandelion seeds in it.

Volant and a few other companies make really nice fully enclosed high-flow intake systems for the big diesel cummins, duramax, etc... pickups. Wish something like that existed for us.

I'm contemplating giving a higher-flow filter a try in the existing Liberty airbox. Something like this:

http://www.autotrucktoys.com/liberty/Mo ... 6C480.aspx

Or maybe an Air Raid high-flow filter element.


Yeah, I think that RAM airflow was the goal, not saying they achieved it-- but they had to have some reason to put that goofy thing on there. They did not have much room to play with and the bean counters probably did not want to give them much money, so they just slightly modified the 02 box and called it a day.

On the oz forum I recall reading that when Airflow was making their prototype KJ snorkels, the gasser users reported a MPG gain and the diesel users reported a slight loss. This was compairing the prototype snorkle versus stock box. I figured it was because the new snorkel was a RAM intake, but it had a smaller connector into the airbox thru the fender than the CRD had stock, but still moved more air than the gasser intake. So the gassers did better and the CRDs did the same or worse. This restriction was fixed and now everyone gets better MPG.

Also, If you look in the performance forum section of this site (4x2) you will see it is a popular mod for the gasser guys to cut out an intake almost exactly like ours. They say it greatly increases their MPG and makes the motor respond quicker. Of course what good does that do if you get crap into your intake.

I am using the amsoil filter. Perhaps you should try it. I made so many changes at the same time that I cannot give mileage estimates or power estimates-- but I can say the turbo is a little bit more audible with it. The independant testing on the filter showed it to flow 150$ more than the stock filter and it is reusable, filters better, and does not restrict airflow as much when it gets wet, It is synthetic, and has deaper pleats and much more of them. I think it was around $40. P.S. I don't sell or work for amsoil.


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PostPosted: Thu Jun 14, 2007 6:00 am 
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Why would you need RAM air on a turbocharged engine? Especially when the turbo rarely runs at 100% output anyhow?

I can see a less restricted path helping but not ram air....

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PostPosted: Thu Jun 14, 2007 7:26 am 
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I think he is referring to cooler cleaner air...and a little ram effect is never a bad thing :twisted:

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 Post subject: Re: results
PostPosted: Thu Jun 14, 2007 11:12 am 
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Threeweight wrote:
Anyway, I was just curious if anyone has tried transplanting a bigger or more efficient airbox into a CRD Liberty.


To answer your original question, we did have a thread on this. I agree that this is important.

1) Some folks tried one of those after-market, epossed cones to replace the airbox (which just take in engine compartment air). The cones have poor particulate filtering properties and were generally nixed as an option on those grounds first, second on the fact that you don't get tons of airflow into the engine compartment. The do get more air in, though.

2) We looked for bigger vehicle airboxes and filters that might fit. No one found one, there isn't much space. Keep looking, though.

3) The snorkle guys say they are getting better airflow to the existing box. They aren't getting much more air, IMO, unless they decide to put a big cone funnel up there and route the snorkle closer and somewhere forward of the airbox, instead of the convoluted route they have making the air go forward a long way then back into the box. Long tube slow down air (there is a "friction"). Probably does reduce dirt intake and help when fording streams.

4) We talked about building an airbox to fit in the (limited) space. I thought I was a genius because I was came up with a weird patterned box that would allow the use of 2 standard filters. But it would have been a PITA to build and change the filters. The better, more elegant, and obvious (to everyone but ME :oops: ) solution was a better filter with twice the surface area which...

5) Amsoil makes a filter with almost twice the surface area, which fits in (either) aibox and should give increased flow. Probably the easiest and most effective.

I'd still like to see a big big airbox, but unless it is mounted outside the Jeep, there just isn't room.

I'm still listening for ideas...join the hunt.

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PostPosted: Mon Jun 18, 2007 2:28 am 
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I drove back from a fishing trip yesterday in a torrential rainstorm (even had a bit of snow mixed in on Mount Hood). Got home, popped the hood, pulled the filter... and found standing water in the bottom of my airbox.

The filter element was not wet, but that wasn't exactly what I was hoping to see.

Oh well, I guess I'll be calling the local junkyards this week. I like the suggestion on the Amsoil filter... I am torn between going with it or just using a high quality paper filter from Wix or Puralator.


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PostPosted: Mon Jun 18, 2007 8:57 pm 
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Did the 05 and up gassers use the same airbox as the crd's?

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PostPosted: Mon Jun 18, 2007 9:04 pm 
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Apparently there is an internal differnce in the post '03. An '02 or '03 is the one you want. I picked up the box, snorkle and deflector for $42 sans lid. If it is a pull it yourself place I would suggest that you take a cordless drill and bits to drill out the rivet for the deflector. The guy buggered mine up a it ham handing it off the wreck. You might just buy one new for around $14.

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PostPosted: Tue Jun 19, 2007 6:28 am 
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Does anyone have a writeup with photos of the V6 airbox swap, or is it obvious when the parts arrive? It's my wife's daily driver and it's not here during the day for me to poke around in. If it takes any more than an evening because I can't sort it out and it's not ready for her commute the next morning, she won't be a happy camper. :)

- Chris


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PostPosted: Tue Jun 19, 2007 8:08 am 
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chrispitude wrote:
Does anyone have a writeup with photos of the V6 airbox swap, or is it obvious when the parts arrive? It's my wife's daily driver and it's not here during the day for me to poke around in. If it takes any more than an evening because I can't sort it out and it's not ready for her commute the next morning, she won't be a happy camper. :)

- Chris
It is real obvious and only takes about five or ten minutes. I didn't even do a picture spread because it was so simple.

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PostPosted: Tue Jun 19, 2007 10:05 am 
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Disconnect the lid and put off to the side then pull straight up real hard. The box has three molded nubs on the bottom that sit in rubber grommets, tightly. The biggest part of the job for me was pulling it out and then trying to get it to seat back in.

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Wish list: Lift, Boulder Bars, Something Bigger in the Front and Back, More Lights


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PostPosted: Tue Jun 19, 2007 11:43 am 
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oldnavy wrote:
It is real obvious and only takes about five or ten minutes. I didn't even do a picture spread because it was so simple.


Thanks oldnavy! I'll have a look at it this evening and see about ordering the parts.

- Chris


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