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Old 09-11-2012, 12:06 PM   #1
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What can i do to get more power pit of my 4 cylinder engine?

I wish I had a bit more power out my Jeep. Besides removing big tires and lift what can I do to increase torque??

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Old 09-11-2012, 12:11 PM   #2
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more power = add more cylinders
more effectively using what you have with larger tires = regear

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Old 09-11-2012, 12:12 PM   #3
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Remove the 4 banger and drop in a 6 or 8.
It sucks but really it's the best bang for the buck. You'll get a bunch of guys telling you to open up the intake, open up the exhaust, do this, do that but in the end you're not gonna be satisfied and you'll end up spending more time and money than it would cost to go with a larger power plant.
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Old 09-11-2012, 12:21 PM   #4
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Yeah I been consider dropping a straight 6 in it but not quite sure how much they cost or go for.
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Old 09-11-2012, 12:38 PM   #5
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Make it light weight as possible. The more crap you bolt on, the worst the power to weight ratio gets. Light but strong bumpers, softtop, synthetic winch cable, etc all will help.
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Old 09-11-2012, 03:14 PM   #6
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What size tires are you running now? If you put on big tires and did not re gear then it will surely be a pig. Some more info would help.
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Old 09-11-2012, 03:32 PM   #7
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You dont really need more power unless you want to go faster. The 2.5 engine provides plenty of torque and can go anywhere the 6 can.
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Old 09-12-2012, 12:14 PM   #8
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Except up a hill on the freeway in a strong headwind...
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Old 09-12-2012, 01:11 PM   #9
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Except up a hill on the freeway in a strong headwind...
That, my friend, is why the tach reds out at 5! I frequently am in 3rd wound out to 4k in the mountains to keep up 55!
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Old 09-12-2012, 01:19 PM   #10
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Except up a hill on the freeway in a strong headwind...
Sometimes it doesn't even need to be up hill.
Just a strong headwind on the freeway will slow me down
even with the petal to the floor.
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Old 09-12-2012, 09:54 PM   #11
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Make it light weight as possible. The more crap you bolt on, the worst the power to weight ratio gets. Light but strong bumpers, softtop, synthetic winch cable, etc all will help.
What he said. If your not using back seat, take it out. Every little bit will help. I can tell the the difference, especially when climbing hills on the highway when I have my off road gear with me. You can even take off the spare tire around town to lighten it up.
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Old 09-12-2012, 10:46 PM   #12
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With the 2.5 you can feel the difference in power available when carrying passengers. I still love mine though. Just accept it for what it is and you wont gave any problems. Trying to find power in the 2.5 is as pointless as searching for the holy grail.
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Old 09-12-2012, 10:51 PM   #13
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Sometimes it doesn't even need to be up hill.
Just a strong headwind on the freeway will slow me down
even with the petal to the floor.
That's insane.

The cheapest option to get more power to the ground would be a nitrous kit but it's not very practical on a jeep. I would think the cheapest engine swap would be with a used straight 6...you could then sell your 4 banger to soak up some of the expense. You can also get it to pass smog since the I6 also came in the tj's...talk to your local smog referee center about that.

You can also have your 4 banger bored/stroked but that will also cost and the power output is questionable...i'd put a I6 in before i'd do that. Then there's forced induction but I dunno if they sell turbo/SC kits for the 4 cylinder. You might have to go with a universal kit which will be a PITA to install if you don't have fab skills.

So basically go with a I6 or regear to use what you have more efficiently
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Old 09-13-2012, 03:45 PM   #14
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Swapping in an I6 is not that simple. From what I understand, the frames are different, you would have to replace the trans., legnthen the the fuel lines ect. It would be easier and cheaper to just sell it and then buy one with a 6. I've had mine for over 4 years now and have been very happy with it. I didn't buy it to go fast, and it does just fine offroad.If your running bigger tires the best thing you can do is to regear, that would be the best bang for your buck.
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Old 09-14-2012, 08:13 AM   #15
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Well it sure ain't cheap buuuutt....


Avenger Superchagers.

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