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Old 10-19-2012, 09:43 PM   #1
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How do I get more power out of my 2.5l

How do I get more power out of my 2.5l

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Old 10-19-2012, 10:34 PM   #2
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Better gearing and less weight will serve you better.

electric fan, 4.0tthrottle body, header, ford injectors. These all help but not by much really.

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Old 10-19-2012, 10:38 PM   #3
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Proper gearing is the main thing. Once you have that get more air into and out of the engine
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Old 10-20-2012, 12:01 AM   #4
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By replacing it with this:

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2.5L Genius of some sort.
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Old 10-20-2012, 02:22 AM   #5
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Or one of these.....

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Old 10-20-2012, 08:34 AM   #6
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2.9 stroker kit
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Old 10-20-2012, 09:05 AM   #7
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Or one of these.....

Or even one of these:



Toyota 1GR-FE.
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Old 10-20-2012, 09:48 AM   #8
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By replacing it with this:
What he said..

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Old 10-20-2012, 11:02 AM   #9
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What a bunch of smart asses... (and I mean that with the most love and respect I can gather...)
I have a 2.5l and it gets me everywhere I need to go. And I can drive back and forth to work (15 miles each way) all week and use about 1/2 tank of gas. In my XTerra that would be a full tank of gas and maybe a little extra.
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Old 10-20-2012, 01:31 PM   #10
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It is shame such great old motor design takkes such a beating about power and speed in the YJ. I actually started to enjoy driving again albeit much slower. With 4" lift and 33s on 4:10s I get around town OK and slow on the interstate but I find it much more relaxing than racing all over. Great on the trail it will climb walls. It would be nice to have some more power but its a Jeep.
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Old 10-20-2012, 02:23 PM   #11
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I love how your, big on hating the 2.5l why ?
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Old 10-20-2012, 02:25 PM   #12
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Originally Posted by jokerchief462
It is shame such great old motor design takkes such a beating about power and speed in the YJ. I actually started to enjoy driving again albeit much slower. With 4" lift and 33s on 4:10s I get around town OK and slow on the interstate but I find it much more relaxing than racing all over. Great on the trail it will climb walls. It would be nice to have some more power but its a Jeep.
I agree I love my 2.5L
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Old 10-20-2012, 04:05 PM   #13
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I don't hate my 2.5L just would like a bit more highway pull. As far as power goes for upgrades there isn't a whole lot other than forced induction, internal upgrades in which these seem too much money for the gain, motor swap is cheapest IMO
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Old 10-20-2012, 07:48 PM   #14
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What a bunch of smart asses... (and I mean that with the most love and respect I can gather...)
I have a 2.5l and it gets me everywhere I need to go. And I can drive back and forth to work (15 miles each way) all week and use about 1/2 tank of gas. In my XTerra that would be a full tank of gas and maybe a little extra.
Agreed, I get around 18mpg. It cruises fine with 4.10's, 5 speed, and 235/75's.

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I love how your, big on hating the 2.5l why ?
I'm not hating. Nowhere in this thread did I say "I hate my 2.5L". It's just that sometimes it gets a little boring, be nice to have a different type of power under the hood. I've always wanted to do a 3.9L Cummins 4BT.
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Old 10-20-2012, 08:11 PM   #15
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When I got my first 2.5 I really was disappointed compared to nay of the inline 6's I have had. After the re-gear to 4.88's and almost a year behind the wheel, it has grown on me quite a bit. It does great off-road, but will never be much on the highway compared to a 6 cyl. no matter what gears you put in it. Gearing makes it much more drivable for everyday use for sure.
To answer your question.......... gearing is by far the best gain I have found for the 2.5. Especially with larger tires. This also helps bring the economy back for the fuel mileage. I am getting approx. 18 mpg with 4.88's and 33" tires with mixed driving.
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Old 10-20-2012, 09:25 PM   #16
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Toyota 1GR-FE.
Wut? LOL
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Old 10-20-2012, 09:31 PM   #17
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Ok, Ill say it.

I HATE MY 2.5L IT DOESNT HAVE ENOUGH POWER FOR MY NEEDS.

and I really dont care if you like that.
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Old 10-21-2012, 09:32 AM   #18
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Wut? LOL
No faith in Toyota, huh? 236hp and 266ft. lbs. of torque, seems to be working VERY well in newer Tacomas and FJ cruisers. Plus the bolt on TRD Supercharger, which outputs to 304hp and 334ft lbs of torque, more than a small block V8
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Old 10-21-2012, 09:40 AM   #19
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Like I said huh? More than what small block v8? There are tons and tons of them that make more power than that for way less cash.
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Old 10-21-2012, 10:11 AM   #20
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Quote:
Originally Posted by Xpress

Agreed, I get around 18mpg. It cruises fine with 4.10's, 5 speed, and 235/75's.

I'm not hating. Nowhere in this thread did I say "I hate my 2.5L". It's just that sometimes it gets a little boring, be nice to have a different type of power under the hood. I've always wanted to do a 3.9L Cummins 4BT.
Ok we'll if its boring u should thought about that before u bought it, but I think the diesel would be pretty cool
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Old 10-21-2012, 10:13 AM   #21
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Originally Posted by d5string
When I got my first 2.5 I really was disappointed compared to nay of the inline 6's I have had. After the re-gear to 4.88's and almost a year behind the wheel, it has grown on me quite a bit. It does great off-road, but will never be much on the highway compared to a 6 cyl. no matter what gears you put in it. Gearing makes it much more drivable for everyday use for sure.
To answer your question.......... gearing is by far the best gain I have found for the 2.5. Especially with larger tires. This also helps bring the economy back for the fuel mileage. I am getting approx. 18 mpg with 4.88's and 33" tires with mixed driving.
We're did u get your 4.88 grears , I also running 33' but with 12.50r15
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Old 10-21-2012, 10:14 AM   #22
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Originally Posted by 2xs
Ok, Ill say it.

I HATE MY 2.5L IT DOESNT HAVE ENOUGH POWER FOR MY NEEDS.

and I really dont care if you like that.
Should have thought about it before u bought it,
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Old 10-21-2012, 12:16 PM   #23
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Ok, Ill say it.

I HATE MY 2.5L IT DOESNT HAVE ENOUGH POWER FOR MY NEEDS.

and I really dont care if you like that.
Understood, but we dont care that you DONT like it...

Is it possible that my Jeep was regeared by the previous owner? I have no problem at all going 75-80mph on the freeway (GPS speed). In fact, yesterday I drove from San Diego to North Orange County at 80mph the entire trip And still only went through a 1/4 tank of gas for the 110 mile trip.
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Old 10-21-2012, 02:51 PM   #24
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Originally Posted by Carlsbad0331

Understood, but we dont care that you DONT like it...

Is it possible that my Jeep was regeared by the previous owner? I have no problem at all going 75-80mph on the freeway (GPS speed). In fact, yesterday I drove from San Diego to North Orange County at 80mph the entire trip And still only went through a 1/4 tank of gas for the 110 mile trip.
It's possible. The most reliable way to tell is to pop the diff cover and count teeth, but if you don't want to do that (understandable) you can put it on jack stands, rotate a tire by hand one full revolution, and count how many turns your driveshaft makes. The number of times it turns will be your ratio.
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Old 10-21-2012, 06:07 PM   #25
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Like I said huh? More than what small block v8? There are tons and tons of them that make more power than that for way less cash.
What I was thinking..
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Old 10-21-2012, 07:43 PM   #26
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Should have thought about it before u bought it,
I bought it with an engine swap in mind, then the economy tanked, I still love it, and im currently still collecting swap parts.

Got an AX15 and Tcase from a 92 XJ, got a GM 90* bellhousing, and pretty soon ill have the SSYE and GM Bell adapter soon.

Then I gotta find the donor vehicle....
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Old 10-21-2012, 08:04 PM   #27
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We're did u get your 4.88 grears , I also running 33' but with 12.50r15
I got them from Liveoffroad.com as a deal on selling my 46 CJ2a to their other company Kaiserwillys.com
They are Spicer gears.
They gave me a nice credit at their store and I got a lot of awesome stuff from them. There are several vendors on this site that sell gears and will give you a discount from being a member.
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Old 10-21-2012, 11:43 PM   #28
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Ok we'll if its boring u should thought about that before u bought it, but I think the diesel would be pretty cool
First of all, you should do your research BEFORE you make an arrogant assumption such as this. If you had, you would have discovered that I never paid a single penny for my Jeep. It was a gift from my uncle. Yes, it has a 2.5L. Yes, I drive it DAILY. And yes I enjoy not filling up as often as my 6 cylinder counterparts. That being said, it becomes a boring powerplant to work with when you're logging some 2500 miles a month on it- even more-so if you log more than that. You will get bored of anything after driving it constantly. I ride a 2003 Kawasaki KLR650, which is by no means a slug, and on the occasion I get bored of it. You need something to spice it up every now and then.

This isn't to say it isn't an adequate engine. It cruises beautifully. There isn't anywhere it CAN'T go, and there are some DIE-HARD Jeepers with massive rigs that put up with the big block boys just fine with the 2.5L. It didn't earn its name as the Iron Duke because it's a boat anchor.

Another thing, unless you have significant experience with something, you simply cannot pass judgement. A lot of 6 cylinder guys flame the 2.5L, claiming it's Weak, Underpowered, Sluggish and what have ye, when they have never driven one before. Internet heresy goes a long way, and often times it's nothing but fictional opinions. You'll find that there's a member or two around here that swear by using the front track bar, and that it doesn't limit the suspension flex on the front of their rigs, when anyone with a basic understanding of how leaf springs articulate would realize that regardless of how your suspension is setup, the bar limits flex. But that's another thread entirely..
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Old 10-21-2012, 11:46 PM   #29
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Like I said huh? More than what small block v8? There are tons and tons of them that make more power than that for way less cash.
Sure, there are plenty of modded small blocks that are putting out big power, but I'm not a fan of "going with the flow" and just tossing in a V8. Why not mix it up a bit with a more unique engine? Especially one that can be modded equally easily and still put up with a big guns. And have the fuel economy of a 6 cylinder...

Plus it's a Toyota powerplant, one that has absolutely no issues whatsoever
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Old 10-22-2012, 07:41 AM   #30
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The amc 2.5L is not an iron duke btw. Common misconception.

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