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Old 11-14-2014, 04:46 AM
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New jeep/forum member. Needs performance mods

Always been curious about jeeps. I've leaned towards lifted diesel trucks, sports car and hotrods. So I pulled the trigger on a 13' 2d sport auto. I'm doing a 4" lift with 35". I'd like to get a little more nut from her. So I'm doing a Gibson exhaust, which intake and tuner should I do, also is there any other mods out there for the 3.6l.. No s/c or turbo.

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Old 11-14-2014, 05:22 AM   #2
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I'd first do some research on 4" lifts and why they're a headache, especially just to clear 35's. If you still want to go that high, don't cheap out on the lift and other necessary components.

The only performance mods that will net you any noticeable power are forced induction or a V8 swap. Jeeps don't respond to intake/exhaust/tunes like a diesel will. If you want power, you bought the wrong vehicle.

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Old 11-14-2014, 05:36 AM   #3
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Spend the money on gearing. The bigger tires will kill performance. You want a gear set that will bring you back stock or better.
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Old 11-14-2014, 02:54 PM   #4
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35's will kill performance. you will not gain a very significant amount of power from those mods compared to the cost involved with the mods, best bet is gears
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Old 11-14-2014, 03:33 PM   #5
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Also, with a 4" lift you should slap some 37s on that thing. A 2.5" would be much more suitable for 35s, and a lot less work from what I hear. Keep in mind most quality lift kits will net you more than their advertised lift heights
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Old 11-14-2014, 03:34 PM
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Mack207. What do you mean by headaches with a 4". And cheaping out on a 4" lift, gears I'll do, what ratio is recommended. I'm still doing an exhaust for the sound.
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Old 11-14-2014, 03:35 PM
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The f250 6.7 cc has 37's.. So I don't want 37's on this. Don't want to kill the mpgs.
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Old 11-14-2014, 04:05 PM   #9
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Quote:
Originally Posted by Tmaxxman21 View Post
Mack207. What do you mean by headaches with a 4". And cheaping out on a 4" lift, gears I'll do, what ratio is recommended. I'm still doing an exhaust for the sound.
Check out the links in kjeeper10's sig. He's the guru on lifted jeeps.
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Old 11-15-2014, 08:11 AM
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Right on. thanks
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Old 11-16-2014, 12:13 AM   #11
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I agree with the others that these Jeeps gain little if any benefit from bolt ons and tuners. Exhaust as it seems you already know is sound only. Spend the money on gears. Anything you do with lift and tires, especially the type you are considering will drop the mileage. compare the aerodynamics of a smooth brick to a rough brick with a sail.
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Old 11-16-2014, 12:00 PM   #12
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Save the cash and forgo the bolt on "performance" mods.

Unless you are going to spend big money on blowers, you will see no measurable results from loud cans, open intakes, etc. Performance is holistic and not hidden in a muffler or an air cleaner.

More often than not, you'll see a decrease in MPG because you will tend to drive harder after installing those parts.
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Old 12-02-2014, 03:33 PM   #13
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I'm researching exhaust options for a different reason. I did a cat back exhaust on My 4 door Subaru and realized a 4 mpg improvement at hiway speeds. My '12 is set for distance travelling with the 2.73 gears and a manual tranny so I'm looking for less back pressure and no drone.
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Old 12-02-2014, 04:41 PM   #14
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I'll start off by pointing out the typo, it's 3.73 (3.21 is the base gear ratio and the highest available).

You're not going to see any gains in fuel economy like that. Seriously think about it...we're talking about one of the least efficient vehicles available today. You think Chrysler would've gone with the current setup if a straighter or wider pipe could give a 20% increase in mpg? At best you'll trade torque for hp and see such a negligible increase in economy that you won't be able to attribute it because it'll be outshined by other variables.
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Old 12-02-2014, 05:09 PM   #15
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The challenge you face with any performance mod is the PCM/ECU. Without reprogramming this module it is very difficult to get any gains since it controls the engine and its subsystems.

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