07-09 WK1 3.0L Diesel - Cherokee SRT8 Forum
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post #1 of 10 (permalink) Old 03-11-2015, 09:31 AM Thread Starter
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07-09 WK1 3.0L Diesel

After I sold my beast I used some of the money to buy my son a 2007 Subaru Legacy.

He is asking me to trade it in on a 2007-2009 Grand Cherokee with the 3.0L turbo diesel engine. Of course he also want to lift it with bigger tires for offroad use.

Anyone owned or drove one of these diesel rigs?

Thanks for any and all information.

Tony


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post #2 of 10 (permalink) Old 03-11-2015, 10:07 AM
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I did not think the wk1 had an option for the diesel. I thought it was on the 2012-2013 when it became available.

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post #3 of 10 (permalink) Old 03-11-2015, 11:44 AM Thread Starter
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They could be ordered with the Mercedes 3.0-liter turbo-diesel , same one that was offered in the ML320 suv and E320 sedan.

It was only offered in the 2007-2009 model years though.

SPECS: The 3.0-liter common-rail turbo-diesel (CRD) V6, engineered by Mercedes-Benz, produces 215 horsepower at 3400 rpm and 375 pound-feet of torque at 1600 rpm

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post #4 of 10 (permalink) Old 03-11-2015, 11:59 AM
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I ran a 2007 3.0 WK1 for 18 months - it was the main seller here in the UK and at times the only option apart from the SRT8 - I bought it to replace my 4.7 that I had used for 10 years and 100,000+ miles.

The 3.0 diesel in the UK used the Mercedes based engine and was a smooth and relatively economical motor - I was getting about 40% more miles per gallon compared to the 4.7. Once on the move it was quick, responsive and very quiet at 75/80 mph cruising speeds. On paper the acceleration and top speed were very similar to the 4.7 BUT the issue that my wife and I had was turbo lag from idle especially when pulling out of a junction into traffic. Press the gas (diesel) pedal and there was a brief delay before the power kicked in - totally different to the way a V8 responds. Once revs were over 800/900 response was excellent.

That turbo lag was sufficient excuse to go back to a V8 and the only petrol (gas) option from 2008 in the UK was the SRT8.

I hope this helps - if you have any specific questions just ask away and I will try and answer if I can.
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post #5 of 10 (permalink) Old 03-11-2015, 12:46 PM
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That's very cool. I want a diesel just cause. I think they are great engines can be made to run on a variety of fuels efficient at making power/energy compared to gas and they are just cool.
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post #6 of 10 (permalink) Old 03-11-2015, 03:31 PM Thread Starter
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Quote:
Originally Posted by whitebeard View Post
I ran a 2007 3.0 WK1 for 18 months - it was the main seller here in the UK and at times the only option apart from the SRT8 - I bought it to replace my 4.7 that I had used for 10 years and 100,000+ miles.

The 3.0 diesel in the UK used the Mercedes based engine and was a smooth and relatively economical motor - I was getting about 40% more miles per gallon compared to the 4.7. Once on the move it was quick, responsive and very quiet at 75/80 mph cruising speeds. On paper the acceleration and top speed were very similar to the 4.7 BUT the issue that my wife and I had was turbo lag from idle especially when pulling out of a junction into traffic. Press the gas (diesel) pedal and there was a brief delay before the power kicked in - totally different to the way a V8 responds. Once revs were over 800/900 response was excellent.

That turbo lag was sufficient excuse to go back to a V8 and the only petrol (gas) option from 2008 in the UK was the SRT8.

I hope this helps - if you have any specific questions just ask away and I will try and answer if I can.
Thanks for the info. Looks like bullydog makes a tuner for it. http://www.bullydog.com/product.php?ID=113

I wonder if that or another tuner/mod would solve the turbo lag. Did you do any mods or tunes to yours?

And here is another one that shows some good numbers. http://www.greendieselengineering.co...pGrandCherokee

Last edited by TonySRT8; 03-11-2015 at 03:55 PM.
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post #7 of 10 (permalink) Old 03-11-2015, 04:14 PM
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Quote:
Originally Posted by TonySRT8 View Post
Thanks for the info. Looks like bullydog makes a tuner for it. http://www.bullydog.com/product.php?ID=113

I wonder if that or another tuner/mod would solve the turbo lag. Did you do any mods or tunes to yours?

And here is another one that shows some good numbers. http://www.greendieselengineering.co...pGrandCherokee
Mine was standard - no mods. Interestingly when starting from cold in cold weather the idle speed was raised and this cured the turbo lag problem - until the engine warmed up. I believe that a simple "tune" to raise the idle speed could/should solve the issue but I had already decided to go back to a V8.

One big difference with a diesel is the amount of engine braking it provides - come off the loud pedal and it seems as if the brakes have been applied, very useful on down grades. I really noticed the difference when I first drove my SRT8 - lift of the gas on that and it does not seem to slow down at all. I also tended to drive the diesel in a far more sedate manner than I do with the SRT8 - only a matter of time before I get speeding ticket!
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post #8 of 10 (permalink) Old 03-11-2015, 05:45 PM
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I think the best thing about those diesels those years is that they didn't use the stupid EPA DPF ( diesel particulate filter ) with the separate urea tank .
That's what keeps me from buying a new JGC diesel .

2008 Jeep SRT8 / Steel blue
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post #9 of 10 (permalink) Old 03-12-2015, 08:14 AM Thread Starter
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Originally Posted by unkle View Post
I think the best thing about those diesels those years is that they didn't use the stupid EPA DPF ( diesel particulate filter ) with the separate urea tank .
That's what keeps me from buying a new JGC diesel .
The more I read about them the more I like them. With a tune, lift kit, and bigger tires, they are a go anywhere rig.

Looks like the Quadra-Drive II (R) 4WD System with front and rear Elec LTD Slip Differential Axles are an option on those years also.
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post #10 of 10 (permalink) Old 03-15-2015, 09:53 PM
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Yes they have them, quite a few here in Canada, and still hold their value. Based off Merc drivetrain from what I heard. Know a few guys in the local Wheeling community with them who really like them. Great fuel economy too.

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