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Thread: ‘11 JK Sport - Painfully sluggish!

  1. #11
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    Quote Originally Posted by longarmwj View Post
    If you wheel your Jeep, especially in dusty environments, do NOT get an open element style intake. Get one that is sealed. I run an AFE intake on my 17 JK and I went to clean the filter the other day and there was nothing beyond ordinary dust on it, and the intake tube was free of debris.
    Great suggestion! Thank you.


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  2. #12
    Knows a Thing or Two TheGrendel's Avatar
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    Quote Originally Posted by Predfan75 View Post
    My wife just wants it to be a daily driver at this point.


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    if you're in a sport, your gearing is no better than 3.73 but could be as low as 3.21. regear to get some power to the ground.

  3. #13
    Been Around the Block sm31's Avatar
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    From the sound of it, you may have the 3.21 gearing. My JKUR (4.10) is certainly not "peppy" but I find it livable even with my 35" tires on heavy beadlocks. Unless there is something wrong with the power output, that would be my guess.

    And it's always nice to speak with a Predators fan.

  4. #14
    Old Timer longarmwj's Avatar
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    Just turbocharge it. I’ve heard nothing ever goes wrong when you throw boost on a 3.8


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  5. #15
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    Quote Originally Posted by longarmwj View Post
    Just turbocharge it. I’ve heard nothing ever goes wrong when you throw boost on a 3.8


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    Yeah I’m not sure about that!


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  6. #16
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    Quote Originally Posted by sm31 View Post
    From the sound of it, you may have the 3.21 gearing. My JKUR (4.10) is certainly not "peppy" but I find it livable even with my 35" tires on heavy beadlocks. Unless there is something wrong with the power output, that would be my guess.

    And it's always nice to speak with a Predators fan.
    Absolutely! Go PREDS! I will need to figure out which gear ratio I have and look at options from there. Thank you!


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  7. #17
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    Quote Originally Posted by TheGrendel View Post
    if you're in a sport, your gearing is no better than 3.73 but could be as low as 3.21. regear to get some power to the ground.
    That seems to be the unanimous suggestion. Thank you!


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  8. #18
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    New gearing will make a huge noticeable difference, intake, exhaust & tune in comparison, not so much. Google "Jeep JK 3.8 Gear Chart" be sure to use the one for the automatic and keep yourself in the middle of the green area for a on street daily driver. Be sure you measure your tire size manually for the calculation. The 3.8l engine makes decent power, its the 42RLE automatic trans that kills the whole driving experience. I would skip the bolt-ons and go straight for gears.

  9. #19
    Addict catahoula's Avatar
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    I'm running 3.73's and 295/7017's. Been happy. Also calibrated with Superchips. 2011 JK.
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  10. #20
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    Quote Originally Posted by Predfan75 View Post
    That seems to be the unanimous suggestion. Thank you!


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    Ya, the super charger bit was a joke (for the love of GOD do not do that). You likely have 3.21 gears (which means you didn't have much torque in the first place). I would explore getting regearing done. For a pavement princess, you likely can go with 4.56 or 4.88 gears (more torque on the low end and higher RPMs at the high end). I went from 3.21's to 4.88's on a 3.8l and it was night and day.

    If there is a chance you may start wheeling it, you might want to look into the more expensive option of replacing the front Dana 30 axle and housing with a Dana 44. If you wheel the D30, you will likely break it over time and it is expensive to regear twice.

    I would check with Essentially Offroad in Murfreesboro (I know, the is hell and gone for you, but they are a good shop) for pricing.

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