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Old 08-02-2012, 07:27 AM   #1
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Diesel TJ ?

Hi, just wanted to check on something that i heard. Do you really get 30-35 mpg by converting to diesel in a TJ? I know its expensive and not anything i can afford, but just wanted to know if anyone here has done it and what they think about it. Do you gain or sacarfice torque or horsepower or etc... vs the stock setup? And would the diesel get close to 30-35 mpg stock (small tires, no lift....)... or what mpg do you think a diesel can get with 2 inch lift with 33's on it? Just wondering, any answers would be apprecaited. Thank you

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Old 08-02-2012, 07:49 AM   #2
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I own a diesel Liberty (yes, they came with a diesel engine, just like the JK) and I get around 24 Mpg. Jeeps are heavy.

If you convert a TJ to a diesel, it all depends on what engine you put in. A 4 banger will give you better MPG then a V8, although you sacrifice torque/bhp. Just like with a gasser.

With a diesel engine you gain bottom power, (full torque available at low rev's) and with a modern VGT turbo engine you will have plenty of ponies.

I cannot say what Mpg a TJ would get, all I can say is that the GC with the 3.0 does 27mpg..The JK CRD does about the same as my KJ, 24 Mpg.

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Old 08-02-2012, 07:57 AM   #3
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Would keeping the I6 be an option?
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Old 08-02-2012, 08:01 AM   #4
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That would be your best option. If you fit a diesel in a TJ (apart from the price for the conversion) I don't know if you are legal over there in the US.
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Old 08-02-2012, 09:48 AM   #5
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For some reason I was thinkin that foreign market tj's were available with the same I4 diesel that's in the libertys.
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Old 08-02-2012, 10:28 AM   #6
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So the I6 can be diesel, but you dont think it would be legal? Any reasons why? Thanks
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Old 08-02-2012, 11:19 AM   #7
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I've never witnessed it personally, but I've talked with a few gas to diesel conversion companies at the York Jeep show over the years and they have continuously claimed to get around 33MPG in a TJ on 35s. When the I6 eventually gives up the ghost I would be interested in looking into the conversion if that's accurate.
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Old 08-02-2012, 04:20 PM   #8
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So if it is done right it's legal then.
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Old 08-02-2012, 05:43 PM   #9
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Legal where I live, no inspection here
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Old 08-02-2012, 05:49 PM   #10
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Quote:
Originally Posted by Steve1989 View Post
So if it is done right it's legal then.
it depends on where you live, and how you go about it.
a diesel swap means a new engine. in some states, with an engine swap, the engine has to be newer than the vehicle it is going into.
then there is emissions inspections. your jeep will have to pass what would be considered normal for the gas powered TJ, with a diesel engine, that may not be possible.
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Old 08-02-2012, 05:57 PM   #11
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OH....so if i wanted to stay with an I6 i'd have to find another I6 motor from what a dodge truck?
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Old 08-02-2012, 06:04 PM   #12
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Quote:
Originally Posted by Steve1989
So the I6 can be diesel, but you dont think it would be legal? Any reasons why? Thanks
Quote:
Originally Posted by Steve1989
OH....so if i wanted to stay with an I6 i'd have to find another I6 motor from what a dodge truck?
Yes. As far as I know you cannot convert the 4.0L to a diesel. They use wildly different ignition tech, compression, etc.

Also if you were to get an I-6 diesel out of say, a Dodge Ram, it would be HEAVY. One popular swap is the 4bt Cummins

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