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Old 02-08-2014, 06:26 PM   #1
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2010 jk seems doggy

I'm sure this has been answered, but the 3.8 in my JK seems a little doggy. It's my understanding that the 2011's have 85 more horse power. My question is, what's different? Is it a simple upgrade?

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Old 02-08-2014, 07:01 PM   #2
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2011 was the last year of the 3.8. The 3.6 in 2012 had more hp (and other issues). I do not feel that my 2011 is a dog at all. I drove both and bought the 2011. Prophetic now with the problems a lot of '12's had.

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Old 02-08-2014, 07:06 PM   #3
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I have no problems with my '12 and it will run circles around the 3.8
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Old 02-08-2014, 07:06 PM   #4
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The gear ratio and tires you are running are what really affects the performance.

Is your jeep a manual or an auto? Also, what gears and tires are you running? You may need to regear.
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Old 02-08-2014, 07:07 PM   #5
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Old 02-08-2014, 07:16 PM   #6
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Quote:
Originally Posted by Jktommy View Post
I'm sure this has been answered, but the 3.8 in my JK seems a little doggy. It's my understanding that the 2011's have 85 more horse power. My question is, what's different? Is it a simple upgrade?
3.8 is a turd. It's a power plant designed for use in soccer mom machines.
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Old 02-08-2014, 08:29 PM   #7
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It's all about gearing with a 3.8. I haven't seen any complaints with those who have a manual and at least 4.10's. Unfortunately, if a 3.8 has an auto and 3.21's there might be some complaints. Replacing the heads won't be one of them. Everything is relative.
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Old 02-08-2014, 09:20 PM   #8
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3.6 is also a Minivan motor
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Old 02-08-2014, 09:43 PM   #9
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3.6 is also a Minivan motor
Details.
It's a charger engine too.
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Old 02-08-2014, 09:50 PM   #10
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Ive had a 10 and a 13, both with exact same tires (35's that I swapped when I upgraded to the 13), same 3.73 gears, and same 6 spd. My 13 will absolutely make my old 10 look like a horse drawn carriage! I could never go back!
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Old 02-08-2014, 10:24 PM   #11
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the 3.6L is better on the road and highways but on the trails not so much..
put them in the Jeep environment and give them the same gears and at that point it will be the driver that determines the better jeep... which is true to most Jeeps off road.

I've had an 11 and now a 13.... I prefer the 13 and the new motor and tranny... but off road they are very similar...
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Old 02-08-2014, 11:08 PM   #12
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Yeah I know 3.6 has more HP I'm just waiting until they get better reliability until then I'm Happy with the 3.8 I was just pointing out that 3.6 is in everything even the Minivan same as the old 3.8
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Old 02-08-2014, 11:33 PM   #13
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It's a manual, with 265/65/16 (I think that slightly under a 32" tire). I like it, but it's not the old 4.0 I'm use to in a jeep.
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Old 02-08-2014, 11:39 PM   #14
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Quote:
Originally Posted by Jktommy View Post
It's a manual, with 265/65/16 (I think that slightly under a 32" tire). I like it, but it's not the old 4.0 I'm use to in a jeep.
Is it a 3.73? The only good thing I've heard (and you may want to speak with someone with more experience than myself) is that the manual with lower ratios perform much better on the 3.8. Again, I'd verify that with people that actually drive them though...
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Old 02-09-2014, 12:20 AM   #15
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Yeah I have a 97 TJ that I just passed down to my middle son 207,000 mi & it has the 4.0 6 & man that thing feels great with the torque at a lower RPM than these V6's lol my 1st Jeep had a 4.2 6 with 112HP but a lot more torque so it felt like way more power
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Old 02-09-2014, 04:19 AM   #16
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3.6 is also a Minivan motor
Nice of you to omit the other dozen vehicles that are also powered by the Pentastar. I guess they are all minivans or maybe the Caravan forum members are over there gripping about the lousy Wrangler engine they have to run in their minivans.

It's light year's ahead of the 4.0L.

If you have the right gearing, a performance tuner and load it down with armor the 3.8 becomes OK. About as good as the 4.0 in TJ or YJ.
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Old 02-09-2014, 05:47 AM   #17
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I'm not sure on the gearing, it's the next thing I need to look into. No tow package on it so I'm assuming it's the 3.73.
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Old 02-09-2014, 06:36 AM   #18
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Nice of you to omit the other dozen vehicles that are also powered by the Pentastar. I guess they are all minivans or maybe the Caravan forum members are over there gripping about the lousy Wrangler engine they have to run in their minivans.

It's light year's ahead of the 4.0L.

If you have the right gearing, a performance tuner and load it down with armor the 3.8 becomes OK. About as good as the 4.0 in TJ or YJ.
I never said it was lousy it's better on the road but all that hp comes in at a high Rpm not as usable off road like a straight six man you guys are touchy about your 3.6 only time will tell if they will be reliable
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Old 02-09-2014, 10:02 AM   #19
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Originally Posted by Jktommy View Post
I'm not sure on the gearing, it's the next thing I need to look into. No tow package on it so I'm assuming it's the 3.73.
My guess is you have 3.21 gears. Your 265/65R16 tires are about 30 inches in diameter. So a 3.73 gear ratio should perform pretty well. I ran 32s. (265/70R17) on 3.73s and it was ok. My only complaint was passing on the highway.

If you stay with the smaller tire size, I would say regear to 3.73 or 4.1. If you go to 4.56, you will lose 1st gear unless you go to bigger tires.

IMO, you want to stay in the upper part of the green in the chart.
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Old 02-09-2014, 02:59 PM   #20
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I'm sure this has been answered, but the 3.8 in my JK seems a little doggy. It's my understanding that the 2011's have 85 more horse power. My question is, what's different? Is it a simple upgrade?
Different engine, and different automatic tranny. Not a simple upgrade at all.

The auto was completely regeared, and that was half of the improvement right there.

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