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Old 07-24-2009, 09:50 PM   #1
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Performance (engine) mods for a 4cyl??

I'm sure that someone here has done some mods to your 4cyl engines. What have worked the best in your experiences? How about HP gains, and improving fuel efficiency?? There's a lot of stuff to be had out there, but as we all know....some of it is crap.

My Jeep (1999 4cyl manual) is mainly a fun vehicle, then occasionally [it will soon be] used to pull an aluminum fishing boat, and maybe one day a small trailer with one motorcycle, and it also does the occasional snow duty, when my Focus just won't cut it.

I'd like to improve the gas mileage if I can, but I also want to be sure that it'll be able to do the light towing I've mentioned above. I worry about it being able to tow anything for long distances - the hills on the Western Kentucky Parkway are usually too much for it to keep up at highway speeds with nothing in tow.

Thanks guys!!

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Old 07-24-2009, 10:19 PM   #2
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The 4 is a great little engine.. however power machine it is not.

Best easy way to increase HP in the 4 cyl, is to sell the jeep and buy one with a a 4.0L.
Or you can swap in a different engine, but you may also need a transmission etc, etc...

As for MPG, its about as good as it will get in stock form.

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Old 07-24-2009, 10:40 PM   #3
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I dont know if your going to improve gas mileage that much, but im in the same boat as you except i have 33s. i have a glass pack, a cold air intake , and a chip from ebay that adjusts air and fuel(actually works cause ebay sells them for like .99 cents)I also added a small cone filter on the engine manifold where a pipe was running from the intake chamber to that point. All of this combines has more power now than my stock tires and no engine mods.
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Old 07-24-2009, 11:33 PM   #4
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it"s a 4 banger
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Old 07-25-2009, 08:39 AM   #5
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Are you lifted and running bigger tires? The best thing is just make sure your axel gear ratios are the right ones for the tire size you are running. Other than that there's not much you could do to the engine besides regular maintainance. Keep the air filter clean, etc.

and for hill driving it's prefectly normal to have to downshift to a lower gear (4th) to get the umph you need to clear the hill. (assuming you have a manual trans)
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Old 07-28-2009, 10:05 PM   #6
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Yeah, that's kinda the answers I thought I'd get. I don't think I'd want to sell it and buy a 6cyl - insurance is enough as it is, and I'm sure a 6 would hurt me even more. Fuel consumtion-wise, I don't think there's a difference is there? You have to push a 4cyl a lot harder to go the same speeds that a 6cyl probably handles with ease.
I've been thinking about the intake for a while, and I've also seen the "Tornado" in JC Whitney's catalog (skeptical about that one...). I just accomplished a tuneup on Sunday, and that seems to have helped some. My check engine light was on - cylinder #1 was misfiring. It runs a lot better now.
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Old 07-28-2009, 10:14 PM   #7
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Are you lifted and running bigger tires? The best thing is just make sure your axel gear ratios are the right ones for the tire size you are running. Other than that there's not much you could do to the engine besides regular maintainance. Keep the air filter clean, etc.

and for hill driving it's prefectly normal to have to downshift to a lower gear (4th) to get the umph you need to clear the hill. (assuming you have a manual trans)
My tires are only slightly bigger than stock - 31's (I had to go look, since I had no clue).
The maintenance, I do pretty well at staying up on. I'm pretty cost-conscious (when it comes to efficiency.....I can blow it out of the water when it comes to goodies for the vehicle I love)
Yeah I have to downshift all the time when on the highway. I pick up tons of speed when going downhill, but I feel like a goob when I get passed going uphill by the same car I just passed one minute before.
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Old 07-29-2009, 04:05 AM   #8
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I have a 4cyl myself I couldn't beat it it had 64,000 miles on it not bad for a 97'. I've had it for a year and half. I went from 30's to 31's and I could tell. I would love to do an engine swap but not right now.
A friend of mine at Autozone said a guy comes in with a turbo on his 4cyl. I guess the guy made the turbo system himself. That would kick. I have a list of things I want to do but wondering if they work or not. I was told throttle body spacer with a cold air intake and a cat back. But that's a lot of cash if not much gain.
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Old 07-29-2009, 11:23 AM   #9
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An air intake may help, but then you need to make sure that you don't drive in any water as it may damage the intake. The stock intake is designed to take on a little water and let it drip out the bottom.
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Old 07-29-2009, 11:38 AM   #10
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An air intake may help, but then you need to make sure that you don't drive in any water as it may damage the intake. The stock intake is designed to take on a little water and let it drip out the bottom.
A new air intake won't help, the TJ's factory air intake is restriction-free (unlike many others) and installing a so-called "performance" air intake system won't help in the least. Not even .001%, regardless of what a few butt-dynos might think.
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Old 07-29-2009, 12:11 PM   #11
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Jerry, have you seen those throttle body (air raid system) the spacers that are spiral..
do those help at all.. and if so is there anything else that needs to be changed or modded
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Old 07-29-2009, 12:30 PM   #12
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Jerry, have you seen those throttle body (air raid system) the spacers that are spiral..
do those help at all.. and if so is there anything else that needs to be changed or modded
First, the spiral does nothing, that's a gimmick. The air is certainly not still spiraling, if it ever was, by the time it gets down past the air intake manifold and valves and into the combustion chamber.

But more importantly, spacers can do wonders for performance when installed under carburetors and the older style of throttle body with a fuel injector attached to it which was a TBI (throttle body injection) system. Modern engines no longer use TBI and neither does the TJ.

When installed under the type of throttle body the TJ uses which only has air passing through it, no fuel at all, a spacer does nothing.... nada, zilch. The only thing some of the spacers do is to add an annoying whistle though I guess some younger drivers think it sounds cool.

Save your $$$, a thottle body spacer does absolutely nothing for any of our TJ engines.
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Old 07-29-2009, 01:09 PM   #13
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thanks Jerry
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Old 07-30-2009, 05:04 PM   #14
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I installed an airrade intake on my 2.4 (2005 with 31s). I did notice an immediate difference in the throttle response, but not much in MPG gain (2-3 mpg gain).
I was lacking in pulling power, low-end torque, and tired of having to switch to 5th and sometimes 4th gear to get up a hill....so I ended up re-gearing to 4.88 and am pretty happy with it with one exception. My RPMs are pretty high @ 60 MPH.


I believe the 2.5L can have a 4.0L throttle body spacer which when combined with an airrade cold air-intake could possibly give you a few more HP. A muffler upgrade might help as well.

I'll back Mr. Bransford in regards to the spiral/tornado piece....definately a waste of money for a jeep.
Hope this was/is useful.
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Old 08-03-2009, 06:18 PM   #15
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My lil 4 banger screams. My jeep has home made cold air, self bored out throttle body, cut off the elbow downward on the tail pipe, NGK plugs gappped at 0.38. accel coil and 8mm wires from acmejeepparts.com. My best mod which made a big difference is my throttle body spacer from gsppowerspacers.com. This thing is pretty wild, i tossed my airaid. My next mod as far as engine goes is a electric fan from flex-a-lite.com
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Old 08-03-2009, 07:27 PM   #16
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My best mod which made a big difference is my throttle body spacer from gsppowerspacers.com.
Spacers can give serious performance gains when installed under carburetors and the older style throttle-body injection (TBI) systems where both air and gasoline pass through the spacer. But under the newer type of throttle body our TJs have which pass nothing but air (the fuel is injected by the fuel injectors well below the throttle body and air intake manifold), spacers do nothing. Well, some also whistle a bit but where a TJ is concerned, spacers really don't do a thing. All it's doing is making the air path a bit longer but that doesn't help performance.

I'm not trying to bust your chops on this but seriously, spacers don't do a thing for a TJ's performance. Older TBI systems and carburetors yes, they do help. Just not when under a modern throttle body. Really.
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Old 08-03-2009, 08:09 PM   #17
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Spacers can give serious performance gains when installed under carburetors and the older style throttle-body injection (TBI) systems where both air and gasoline pass through the spacer. But under the newer type of throttle body our TJs have which pass nothing but air (the fuel is injected by the fuel injectors well below the throttle body and air intake manifold), spacers do nothing. Well, some also whistle a bit but where a TJ is concerned, spacers really don't do a thing. All it's doing is making the air path a bit longer but that doesn't help performance.

I'm not trying to bust your chops on this but seriously, spacers don't do a thing for a TJ's performance. Older TBI systems and carburetors yes, they do help. Just not when under a modern throttle body. Really.
Man Jerry least you could do is sell him a drop-in filter while your busting his bubble.
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Old 08-03-2009, 08:14 PM   #18
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I'm not trying to bust your chops on this but seriously, spacers don't do a thing for a TJ's performance. Older TBI systems and carburetors yes, they do help. Just not when under a modern throttle body. Really.
What's that whistling sound I'm hearing, Jerry???
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Old 08-03-2009, 11:58 PM   #19
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Has anyone looked a turbo's on the 4cyl. Even say a mitsu t-25 with min boost would help. Not sure on the compression ratio of that motor but if it wasn't too high a mid-boost combined with an aftermarket fuel pump and control, along with maybe a 2.0-2.5 exhaust from the DP should net you some gains.

I guess from an engine building stand point it would be fun to see someone lower the compression ratio on that motor, throw some fuel in it and boost it, not good for hills and climbing, but a smaller turbo would help reduce the lag and make for better highway and driving speeds.

Anyone tried this?
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Old 08-04-2009, 12:17 AM   #20
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a turbo in the mud and dirt is gonna be hard to keep clean. Id be worried about the rest of my drivetrain too. id look into a jeep with a 6cylinder or do a v8 swap.

my 4.0 and 33s have no get up and go issues. 3.73 gears
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Old 08-04-2009, 12:54 AM   #21
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a turbo in the mud and dirt is gonna be hard to keep clean. Id be worried about the rest of my drivetrain too. id look into a jeep with a 6cylinder or do a v8 swap.

my 4.0 and 33s have no get up and go issues. 3.73 gears
Why?

1. You don't run a open intake on it, so it gets no more dirt than any other air filter and you can use the stock air box if needed...there's no need to run the "performance" filter setup.

2. The turbo is sealed, rally drivers run turbos and wit regular maint. have no issues with dirt.

3. The wastegate might get dirty, but depending on if it was an external or internal wastegate would weight on what/if any problems with dirt you might have. The only problem I could see would be large amounts of mud might hinder the actuator arm on an internal gate from opening.

4. If you dump back into the exhaust you have no more open pipes than stock

A turbo is not going to help rock crawlers that much, but for the guy/gal who drives or pulls a boat or trailer it would be a good soultion and cheaper than a swap. a good perfomance shop cuod build one for under 3 grand. just my 2cents.
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Old 08-04-2009, 07:45 AM   #22
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build one for under 3 grand. just my 2cents.
Christ!
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Old 08-04-2009, 08:21 AM   #23
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The 4 is a great little engine.. however power machine it is not.

Best easy way to increase HP in the 4 cyl, is to sell the jeep and buy one with a a 4.0L.
Or you can swap in a different engine, but you may also need a transmission etc, etc...

As for MPG, its about as good as it will get in stock form.
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Old 08-04-2009, 08:25 AM   #24
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man jerry least you could do is sell him a drop-in filter while your busting his bubble.
Been waitin' for a chance to use this.
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Old 08-04-2009, 06:41 PM   #25
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Christ!

That's not high...you figure the costs involved with a good swap and supporting equip would be way more than that.

Maybe I will pick up a 4 banger and try it out, anyone have a good site for the 4 cyl motor, with specs on the engine?
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Old 08-04-2009, 06:53 PM   #26
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That is still high just to squeeze juice out of a Jeep you bought knowing was not meant for performance on the road. If you are going to spend the money might as well do it right and swap to a v8 or something. Wouldn't adding a Turbo to a 4cyl be like adding 20 inch spinners to a rusty gremlin? I guess it is all just opinion but seems like a total waste.
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Old 08-04-2009, 06:55 PM   #27
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That is still high just to squeeze juice out of a Jeep you bought knowing was not meant for performance on the road. If you are going to spend the money might as well do it right and swap to a v8 or something. Wouldn't adding a Turbo to a 4cyl be like adding 20's to a rusty gremlin? I guess it is all just opinion but seems like a total waste.
X2. Spending that kind of $$$ on a 2.5L just doesn't make sense to me either.
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Old 08-04-2009, 07:07 PM   #28
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X2. Spending that kind of $$$ on a 2.5L just doesn't make sense to me either.

I guess it's what you want, I worked at a import shop for 7 years building high performance 4/6cy and bikes, it's nothing to squeeze 300hp out of a 1.8L 4 banger. The 2.5L turbo should make a fair amount of torque, as long as the block is solid. (Oh and this was not just throwing on LED's and a filter type shop, we put out 2-600+ hp 2.0L mitsu's)

Like I said I haven't really looked at the 2.5L but when I get back from this tour in Korea I may hit up a salvage yard and pick up a motor and build it, it would be cool to do, just because it seems no one has done it, or done it well.
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Old 08-04-2009, 07:08 PM   #29
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You can get some incredible performance with forced induction but you won't do much for fuel economy. It would certainly make highway driving more pleasant.
One of the reasons I got rid of my Wrangler was the pathetic performance of the 4 banger. Even with the 6 in Amy's rig, I don't enjoy driving it on the highway.
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Old 08-04-2009, 07:19 PM   #30
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I guess it's what you want, I worked at a import shop for 7 years building high performance 4/6cy and bikes, it's nothing to squeeze 300hp out of a 1.8L 4 banger. The 2.5L turbo should make a fair amount of torque, as long as the block is solid. (Oh and this was not just throwing on LED's and a filter type shop, we put out 2-600+ hp 2.0L mitsu's).
Apples and oranges, you're thinking of modern OHC engines which the very old 2.5L OHV engine is not even in the same ballpark. The 2.5L "iron duke" Jeep engine is an old fashioned old school OHV engine meant for low rpms and off roading, it's not a Mitsubishi or other modern OHC/DOHC/4OHC. That the Jeep's 2.5L and the Mitsubishi engines both have four cylinders is where the similarities end.

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