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Old 03-26-2012, 05:06 PM   #1
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Mods that can increase the HP/Torque?

Are there mods that could increase the horse power or torque of a JK? Did any of you made any changes or add anything to yours? example Chip, muffler, intake, etc?

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Old 03-26-2012, 05:09 PM   #2
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Supercharger, Turbo, or Hemi.

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Old 03-26-2012, 05:10 PM   #3
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Depends. What year is your Jeep? 3.8L or 3.6L? I have heard conflicting outcomes on bolt on performance mods. I have heard some say they gained and some say it was a waste of money.

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Old 03-26-2012, 05:10 PM   #4
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Supercharger, Turbo, or Hemi.
I mean "cheap" mods lol..
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Old 03-26-2012, 05:11 PM   #5
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I've increased my APPLIED HP/TQ 25/30%, b

-----------------------------RE-GEARING---------------------------------

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Old 03-26-2012, 05:11 PM   #6
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Depends. What year is your Jeep? 3.8L or 3.6L? I have heard conflicting outcomes on bolt on performance mods. I have heard some say they gained and some say it was a waste of money.

-Dan
2012 JKU and I was planning of getting a exhaust/muffler kit. Don't know if that'll be a waste or not.
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Old 03-26-2012, 05:12 PM   #7
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Are there mods that could increase the horse power or torque of a JK? Did any of you made any changes or add anything to yours? example Chip, muffler, intake, etc?
Muffler and intake are generally a waste of $$.

A tuner like those made by Hypertech and Superchips will help, but they're only available for pre '11's, cuz of the rolling ECU codes Chrysler started using.

Gearing is the big dog.
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Old 03-26-2012, 05:13 PM   #8
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I've increased my APPLIED HP/TQ 25/30%, b

-----------------------------RE-GEARING---------------------------------

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JB got there first. ^^^^ This.

Not cheap, though. But nothing with a Wrangler is, in my experience.
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Old 03-26-2012, 05:13 PM   #9
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I've increased my APPLIED HP/TQ 25/30%, b

-----------------------------RE-GEARING---------------------------------

JIMBO
Do you feel a big difference let's say 3.21 to 4.10?
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Old 03-26-2012, 05:14 PM   #10
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Muffler and intake are generally a waste of $$.

A tuner like those made by Hypertech and Superchips will help, but they're only available for pre '11's, cuz of the rolling ECU codes Chrysler started using.

Gearing is the big dog.
wolf did they make any 2012 chips yet?
Edit: do you know when it's coming out?
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Old 03-26-2012, 05:15 PM   #11
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As I don't have a 2012, I have heard 4.10 are good for up to 35" tires. You may notice a difference even go 4.56 or 4.88. But since you have the 3.6L you are already up over us 3.8L guys, so go F your self. lol

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Old 03-26-2012, 05:17 PM   #12
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As I don't have a 2012, I have heard 4.10 are good for up to 35" tires. You may notice a difference even go 4.56 or 4.88. But since you have the 3.6L you are already up over us 3.8L guys, so go F your self. lol

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Lol Dan
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Old 03-26-2012, 05:18 PM   #13
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I know a mod that decreases power
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Old 03-26-2012, 05:18 PM   #14
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A tuner like those made by Hypertech and Superchips will help, but they're only available for pre '11's, cuz of the rolling ECU codes Chrysler started using.
Quote:
Originally Posted by Ltblue View Post
wolf did they make any 2012 chips yet?
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Old 03-26-2012, 05:19 PM   #15
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When you guys say re-gearing, what is optimum for performance? I think mine came with 4.10s

I know from the mustang world that 3.73s/4.10s are the most sought after
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Old 03-26-2012, 05:21 PM   #16
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wolf did they make any 2012 chips yet?
Edit: do you know when it's coming out?
I wouldn't expect anyone to have one soon. Since Chrysler went to the rolling codes in '11, peeps have been waiting. And they're all still waiting.

Gearing really is your only option.
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Old 03-26-2012, 05:22 PM   #17
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Take a look at a 2012 regearing chart next to a 3.6 engine dyno and look at what happens as the RPMs go up. Like Jimbo indicated, you're going to see a big boost in applied power as you turn more RPMs. I don't know that I'd go through the expense just for 4.10s, but I'd imagine 4.56s or so would give that jeep a heck of a lot of pull. Of course, you'll be spinning much higher RPMs than you're used to. And Ripp is looking to put out a supercharger that should provide some fairly stunning increases in power.
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Old 03-26-2012, 05:23 PM   #18
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Is that Bruce Lee?

As he seems to be indicating, your post went over my head.
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Old 03-26-2012, 05:23 PM   #19
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Do you feel a big difference let's say 3.21 to 4.10?
Other than re-gearing, leave it alone. I did a dual cat back exhaust knowing that there was no increase in anything, but I like dual exhaust. I have 4.10's and I think it's a good way to go.
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Old 03-26-2012, 05:24 PM   #20
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Quote:
Originally Posted by kbwwolf

Is that Bruce Lee?

As he seems to be indicating, your post went over my head.
He's scratching

Mike -is that druff I see ?
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Old 03-26-2012, 05:25 PM   #21
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Is that Bruce Lee?

As he seems to be indicating, your post went over my head.
My Brain is Full of F**k | Know Your Meme
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Old 03-26-2012, 05:25 PM   #22
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My advice for gearing a '12 is this. For a manual with 35" tires, go 4.56. It's not a conventional size, and Yukon doesn't make gears in that size, but 4.56 will give you the best combination of usable powerband and mpg, IMO.

For an auto of the same configuration, 4.88.
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Old 03-26-2012, 05:26 PM   #23
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Hahahaha...gotcha.
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Old 03-26-2012, 05:28 PM   #24
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I wouldn't expect anyone to have one soon. Since Chrysler went to the rolling codes in '11, peeps have been waiting. And they're all still waiting.

Gearing really is your only option.
Quote:
Originally Posted by MTH
Take a look at a 2012 regearing chart next to a 3.6 engine dyno and look at what happens as the RPMs go up. Like Jimbo indicated, you're going to see a big boost in applied power as you turn more RPMs. I don't know that I'd go through the expense just for 4.10s, but I'd imagine 4.56s or so would give that jeep a heck of a lot of pull. Of course, you'll be spinning much higher RPMs than you're used to. And Ripp is looking to put out a supercharger that should provide some fairly stunning increases in power.

What are the cons of regear? will it damage anything?
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Old 03-26-2012, 05:34 PM   #25
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What are the cons of regear? will it damage anything?
Higher RPMs.

It just runs the engine harder. My guess would be that over time in probably shortens the engine lifespan--after all, you're putting in more rotations per mile than you would have otherwise--but I have no evidence to back that up.

There's no free lunch.
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Old 03-26-2012, 05:34 PM   #26
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Other than re-gearing, leave it alone. I did a dual cat back exhaust knowing that there was no increase in anything, but I like dual exhaust. I have 4.10's and I think it's a good way to go.
haha I know what you mean, I had a old 95 GC and I put a Flowmaster on it, just because I like the sound. Here is a video of my old but not forgotten ride

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Old 03-26-2012, 05:37 PM   #27
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I've generally been avoiding gearing threads of late, but I will say this:

Dave @ AEV wrote awhile back that he thinks 4.10 gears are perfect for a '12 on 35" tires. I agree with this, to a point. If you live somewhere flat, like FL or NE, you should be fine. If you drive in mountains, you won't be.

Most peeps, when they think of gearing, are concerned solely with power gain. But mileage should be considered, as well. If you do it right, both will benefit. But it's a very fine line.

Choosing the right gear ratio for your Jeep takes a lot of research.

Some good general info in this thread: Want 35s dont want to REGEAR ??
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Old 03-31-2012, 07:59 PM   #28
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Other than re-gearing, leave it alone. I did a dual cat back exhaust knowing that there was no increase in anything, but I like dual exhaust. I have 4.10's and I think it's a good way to go.
I'm thinking of putting a Magnaflow on my 12, knowing I will not pick up more than 10 HP, but for me that is only a small part of the reason, the other is to get rid of that monster of a muffler on my Rubi.
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Old 03-31-2012, 08:36 PM   #29
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What about a 2011 with 33's and 2 inch lift, looking for better mpg's but more importantly power, 4.88's or 4.10's or 4.56's? Do quite alot of highway driving.
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Old 03-31-2012, 08:38 PM   #30
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What about a 2011 with 33's and 2 inch lift, looking for better mpg's but more importantly power, 4.88's or 4.10's or 4.56's? Do quite alot of highway driving.
Oh ya, it's an auto.

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