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-   -   3.8 v. 3.6 (https://www.jk-forum.com/forums/modified-jk-tech-2/3-8-v-3-6-a-259538/)

wolfla26 Jan 5, 2013 09:18 PM

3.8 v. 3.6
 
I have a 2010 rubicon and all I know the new engine is out and all, but I had a quick question... Everybody knows the 3.8 is weak and eats gas however is there anything the 3.8 does better than the new pentastar motor?

JaySC Jan 5, 2013 09:19 PM

subscribed

swaite3 Jan 5, 2013 09:21 PM

Some are out of warrantee so it's an easier decision to swap it or super charge it ;)

wolfla26 Jan 5, 2013 09:24 PM


Originally Posted by swaite3 (Post 3367851)
Some are out of warrantee so it's an easier decision to swap it or super charge it ;)

Hahaha I know! I have right around 50k on mine and I'm graduating college pretty soon... Trying to get dad to foot the bill for a 4BT swap before I head to officer training... Let the games begin

Idaho Jan 5, 2013 09:45 PM


Originally Posted by wolfla26 (Post 3367846)
I have a 2010 rubicon and all I know the new engine is out and all, but I had a quick question... Everybody knows the 3.8 is weak and eats gas however is there anything the 3.8 does better than the new pentastar motor?

Compatibility with older minivans... :)

TEX-AG Jan 5, 2013 09:57 PM

I would say reliability and "toughness" MAY be better in the 3.8, its and older (tried and tested) engine and simpler design as compared to the 3.6l. I've also heard that for being a engine with almost 100 more HP the pentastar is not that impressive. Just what i've heard though.

If I were you I'd do the 4BT swap and get that baby pumping 400+ torque's, I'd rather have that than a hemi any day

Tommyfogarty Jan 5, 2013 10:02 PM

I've got a '13 JKU and had a 3.8L JKU immediately prior. The 3.6 is better, but not by leaps and bounds. The thing could use more torque, and it doesn't matter what mill they put in these things until they deal with the (auto) trans... That thing still blows.

lanslide Jan 6, 2013 03:37 AM

Uh...what's the problem with the automatic transmission? :what?:

Originally Posted by Tommyfogarty (Post 3367884)
I've got a '13 JKU and had a 3.8L JKU immediately prior. The 3.6 is better, but not by leaps and bounds. The thing could use more torque, and it doesn't matter what mill they put in these things until they deal with the (auto) trans... That thing still blows.


doc5339 Jan 6, 2013 03:49 AM


Originally Posted by wolfla26 (Post 3367852)
Hahaha I know! I have right around 50k on mine and I'm graduating college pretty soon... Trying to get dad to foot the bill for a 4BT swap before I head to officer training... Let the games begin

Good luck at OCS, OTS, or wherever you are going! I agree 100% on the Cummins 4BT, probably go with from Bruiser Conversions as a first choice. I would take an LS1 5.3 liter VVT with 6L80 from MoTech as a close sec on choice though.

ronjenx Jan 6, 2013 07:32 AM


Originally Posted by wolfla26 (Post 3367846)
I have a 2010 rubicon and all I know the new engine is out and all, but I had a quick question... Everybody knows the 3.8 is weak and eats gas however is there anything the 3.8 does better than the new pentastar motor?

I don't know of anything the 3.8 does better. But my 3.8 fits my financial situation a lot better, (it's paid for).
I have test driven all the combinations of the new drive train several times.
While the performance is better, it not better enough to make me want to go into debt for a new Wrangler.

Regarding the 3.8 being weak, I have found the "lack of power" to be manageable; probably beacause I don't tow a lot.

MPG-wise, I'm getting more out of a gallon of gas than many 3.6 owners: 17-18 around town, 22-23 on the highway.


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