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Old 03-31-2014, 03:10 PM   #1
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2.4L engine mods?

I would love at least just a few more hp out of my 4 cyl. On inclines it suffers and the trip from Tucson back to Sierra Vista is a pain since it has trouble keeping up with the 75 mph speed limit. It's a bummer. Any suggestions that won't break me? I just got divorced...'nuf said.

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Old 03-31-2014, 03:19 PM   #2
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Quote:
Originally Posted by mark567 View Post
I would love at least just a few more hp out of my 4 cyl. On inclines it suffers and the trip from Tucson back to Sierra Vista is a pain since it has trouble keeping up with the 75 mph speed limit. It's a bummer. Any suggestions that won't break me? I just got divorced...'nuf said.
Are you running stock size tires? If you're running larger tires the way to go would be regearing. If you're running stock tires already, there isn't too much you can do for power. Just make sure everything is tuned up and well maintained. That engine has been around for a long time and all the efficiency is already squeezed out of it. Let me know if you have any other questions!

-Ryan

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Old 03-31-2014, 05:48 PM   #3
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The tires are a tad bigger than stock. It came with 215/75 and I have 235/70 now. I thought the stock size looked kind of puny so when I replaced them I went a little bigger.
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Old 03-31-2014, 08:59 PM   #4
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Got a newbie question but I don't mind being ignorant...when talking about differential gears, when the number is higher does that mean the engine runs faster at the same speed? I read a post about changing gears to improve highway performance but it seems like all that would do is just make it redline sooner and give me crappy mileage in town. Please educate me on this.
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Old 03-31-2014, 09:13 PM   #5
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It should actually improve your mileage all around. I have 4.10 gears with the 2.4l and recently went from 31" tires to 33" and my city mileage went down a lot. With lower gearing, if I regear to 4.56 or 4.88, I will not have to give the engine as much gas to keep from stalling out and will actually get better city mileage. My city mileage went from around 18/19 to 14/15 but my highway mileage only went from 21 to 19. Bigger tires affects city mileage a lot more than highway mileage. If this is wrong someone correct me but this is how I see it.
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Old 03-31-2014, 11:13 PM   #6
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Do a search on the forum and the net. The 2.4, also used in the Neon and PT Cruisers is a dual overhead cam, 4 valve engine and from what I have read, responds well to cold air intakes and exhaust mods, unlike the 2.5s and 4.0s that most of us have. Our next door neighbor has an 03 with the 2.4 and he rigged a home made cold air intake and said it has made a noticeable difference in performance and gas mileage. He is running 31s with 4.10 gears and a 5 speed. The po had replaced the stock muffler with a glass pack. Too loud for me but it is not obnoxious. He's 18 so he loves it. I haven't researched it but I bet you could get mild performance cams that would help too, but don't know if computer can keep up with them.
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Old 04-01-2014, 12:47 PM   #7
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They made a turbo for the 2.4l in the neon, someone made it work for the jeep with minimal fabricating. I guess the engine sits in different configurations. Turbo on my 2.4l!!!!!!!!

Of course, you could always do a hemi swap

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