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Topic Review (Newest First)
01-18-2012 02:52 PM
Xpress Just for the record... The 4 cylinder is actually less fuel efficient on the city streets and highways than the 6 cylinder is. Average highway mileage for a perfectly running stock 4 cylinder Jeep fresh off the factory floor was 17mpg. The stock 6 cylinder factory fresh Jeeps got 19mpg.

It's more fuel efficient offroad though. it has PLENTY of torque and just sips the gas on the trails.
01-18-2012 01:44 PM
kjballentine I love my 94 YJ 2.5 4 cyl. My first jeep I ever bought was a 98 cherokee sport with a 4.0, brand new 31" off road tires, paid $400 for it. steal. Anyways, looking back at the 6 and comparing it to my 4 now.... yeah it was nice to have the straight 6 on the highways, but my YJ gets me around just fine. When you decide to buy a wrangler, you're definitely not signing up for a race. I've just grown to love the 4 banger a lot more on the road and at the gas pump. two thumbs up for the 4 banger!!
12-08-2011 08:40 AM
60mg
Quote:
Originally Posted by denisbaldwin
I appreciate the fuel economy of my 2.5, especially considering the 33" tires. That said, there's a lot of times where I wish I had just a little more power. Even 20-30 HP would help get over the 50MPH limit that my 4.11 gears and 4 banger keep me at.
With all due respect, I have no idea what limit you're talking about. I'm on 33's daily and have no issues running it 70 (on the highway especially). As it was said before - stop paying attention to the shift light and run the motor at a bit higher RPM to compensate for tires. Another thing is, unless you had replaced speedo gearing to account for 33's you should be reading you speedometer as + 10 (or so) mph. So, stop complaining about your speed you're doing just fine enjoy you YJ.
12-08-2011 08:22 AM
crtaylor I wish I could have the cash ,the tooling and the knowledge to rework the 2.5 into a 200 hp powerhouse .they do it with jap motors .why cant someone do this ?
is it just not possible? seems to be a ton of 2.5s in the world .and I belive if there were a kit to do this with .there would be a lot of beasted up 2.5s
I do love my little motor reminds me of a tractor putting trough the back roads .
it is what it is
mine dose perform well with the snorkel hooked up. pulls 10 times better than without.and getting 19 mi. to the gallon.
12-08-2011 05:42 AM
denisbaldwin I appreciate the fuel economy of my 2.5, especially considering the 33" tires. That said, there's a lot of times where I wish I had just a little more power. Even 20-30 HP would help get over the 50MPH limit that my 4.11 gears and 4 banger keep me at.
12-07-2011 10:14 PM
alcapon1 mods on my 2.5 make a 4.0 not pencil out.....unless you tow

a 20 gallon tank makes my 2.5l go pretty dam far. Out there I have learned distance is a better attribute than power.

I have a roof rack and a dirt bike hitch which is all I need. It pushes fully loaded just fine.

But V8/V6 do sound nicer


2.5 > 4.0
12-07-2011 08:58 PM
DirtyRob I would aggree with running the 2.5 at higher rpm's to get more speed out of it, but I for one still am not what I would call happy with the 2.5 somewhat content would be a better description. Granted I have 33's on it with stock gears but even with 235/75's it was weak.
For those that compare the 2.5 to a 6cyl I will never understand how people think they are even close in power. (I own 3-4.0's now, and have had several in the past)
The gas mileage isn't much better for the lack of power and torque. Mine gets 15-17 with the set-up I have now, and my 88XJ with 275,000k gets the same. My 98 ZJ gets 18-20 with 31's wuth mixed highway driving.
I personally would not feel comfortable pulling any kind of load with it. I have tried and was disappointed.

However.......when the 2.5 is in 4low, it shines for me. That is where it really has impressed me. I almost like it as much as my 4.0's. To me that is the only saving grace because I use it as much off road as on road.
Just my .02

Let the flogging begin
12-07-2011 07:27 AM
ballistx
2.5 capability

The issue that most people have with the 4cyl is that idiot arrow that tells you to upshift. Put tape over it.

When I got my 94 2.5 it was totaled with 16,000 miles on it. Rebuilt it and people said it was anemic and would hardly pull itself. I told them I wanted a vehicle I could use to tow my hunting trailer to the site and hunt with when I got there, and didn't want to buy a gas station to do it.

When I put the class V hitch on and reinforced it to the frame they laughed.

When I got back from the Jeep Jamborie in Sturgis they didn't laugh any more. 600 miles, 10 hours (including fueling time) pulling a 29' self contained trailer (about 6,000 lb) at 11mpg. Typically running 75-80 on the interstate. (I wasn't passed by a semi the entire trip but I did pass quite a few.)

The key is to drive the engine, not the speedometer. Keep the engine in its power band. It is MUCH better to run that engine continuously at 3500-4000 rpm than to lug it at 2000 rpm. Bearings wear less when spinning under light load than when turning under heavy load. The load is proportioned out over the time period that the crank is under compression/load. Spread the load over twice as many revolutions and you have a LOT less wear. Remember why you bear down on a file, or sandpaper, when you want to cut out more material.

If you want more power on the 2.5, just shift down!
12-06-2011 11:46 PM
Jrockstangs so far i like the 2.5, but havent had a chance to get it out on the highway yet, eventually i want to drop my 383 sbc into it and forget about gas mileage...but for awhile it will stay, until it gives out of course
12-06-2011 09:43 PM
SiLlY Who needs to be quick when we can take the shortcut?!?!
12-06-2011 09:26 PM
Yjpower94 I have had both four and six cylinders. I just sold my sprung over yj 4.0 for a stock 2.5 yj. I have seen four bangers go where the sixs and v-8s didn't. This is my forth yj and I will never buy another 4.0 again. 4 cylinder fury haha.
05-18-2011 12:35 PM
sjkorenek I love my 2.5 too. Just but a rebuilt in from NAPA. Having issues though with timing. If ANYONE an help..please do. See my post... Help!! Crankshaft positions sensor VS flywheel. Thanks.....
05-18-2011 09:19 AM
kboles89 http://m.youtube.com/index?desktop_u...?v=Vwe5tt55cyw
05-18-2011 09:16 AM
kboles89
Quote:
Originally Posted by yj93ben

I'd like to see that, don't suppose you got any pictures of your Jeep doing that? I have a pretty strong 4 cylinder and I don't think I could do that.

I'm going to go give it a try, though.
It can be done. With my 4 cylinder if you hit the gas while rolling in first, let go quick, then stomp it as soon as it compresses the front springs it will pull the tires off about a foot. I did a 4.0 swap and tried it now it just smokes the tires 1st, 2nd, and chirps 3rd
05-18-2011 01:29 AM
MikeMTJ
Quote:
Originally Posted by hughbertfd26 View Post
Your are one smartass idiot. You think I drive around all day riding a wheelie? I was proving my point that 2.5s have power. This isn't a competition
05-17-2011 10:40 PM
hughbertfd26
Quote:
Originally Posted by yj93ben View Post
I'd like to see that, don't suppose you got any pictures of your Jeep doing that? I have a pretty strong 4 cylinder and I don't think I could do that.

I'm going to go give it a try, though.
Lol no I don't have any pictures of it but ill try to get one sometimme
05-17-2011 09:41 PM
yj93ben
Couple feet?

Quote:
Originally Posted by hughbertfd26 View Post
My 95 4 cylinder gets great gas mileage and its got more torque than most these hot rods and diesels in town. I can actually pop the front tires a couple feet off the ground if I'm driving in 1st or 2nd and stomp on the gas pedal. And that's pushin 33s with a 5 inch lift. 2.5s have plenty of power

I'd like to see that, don't suppose you got any pictures of your Jeep doing that? I have a pretty strong 4 cylinder and I don't think I could do that.

I'm going to go give it a try, though.
05-17-2011 06:29 PM
hughbertfd26
Quote:
Originally Posted by Ibuildembig View Post
Umm thats my sig....I wasnt picking on you, but it sounds like you need to calm down
Sorry didn't realize that was your signature. I'm new to this wrangler forum so still getting used to it
05-17-2011 08:54 AM
Ibuildembig
Quote:
Originally Posted by hughbertfd26 View Post
No shit did you not my jeep is red? The inside is rhino lined and has a carpet over it. I'm not a dumbass as youre making yourself sound
Umm thats my sig....I wasnt picking on you, but it sounds like you need to calm down
05-17-2011 06:56 AM
patricks 122,xxx on my 95 and love it. Doesn't move as fast since I put the 33s on it but it isn't a daily driver so its all good. I actually think that the gpm is better in the yj than our v8 hemi xk
05-17-2011 02:14 AM
gennybro So, my whole jeep gets air borne as soon as I pop the clutch.
05-16-2011 11:46 PM
yjforlife
Quote:
Originally Posted by hughbertfd26
My 95 4 cylinder gets great gas mileage and its got more torque than most these hot rods and diesels in town. I can actually pop the front tires a couple feet off the ground if I'm driving in 1st or 2nd and stomp on the gas pedal. And that's pushin 33s with a 5 inch lift. 2.5s have plenty of power
same here lol
05-16-2011 09:03 PM
60mg It's getting interesting
05-16-2011 08:17 PM
hughbertfd26
Quote:
Originally Posted by MikeMTJ View Post
You know what's funny? My 2.2L Toyota Camry from 1994 produces more HP and torque.

It also gets 30 mpgs.

Did I forget to mention it will go 180 mph and I can drive 20 miles while doing a wheelie?
Your are one smartass idiot. You think I drive around all day riding a wheelie? I was proving my point that 2.5s have power. This isn't a competition
05-16-2011 08:14 PM
hughbertfd26
Quote:
Originally Posted by Ibuildembig View Post
No shit did you not my jeep is red? The inside is rhino lined and has a carpet over it. I'm not a dumbass as youre making yourself sound
05-16-2011 07:49 PM
harleyman33 this forum is great....i love this forum...i just got my 91 yj with 2.5 manual trans...i love it. i was wonderin if it would be capable offroad goin over big rocks and thru big mudholes...but now i know...my jeep will cost very little gas to get there and be capable to get me thru there....you guys r great....thanks
05-16-2011 05:36 PM
Xpress You guys are nuts. Once you hit 88mph in a JEEP, you open up a time travel worm hole and have to enter it, as it is unavoidable. At that point your tires will spin so fast that they light the street on fire and you will suddenly explode into a new alternate time line sometime in the future. That is why nobody goes faster than 80 in a Jeep, cause it's scary.
05-16-2011 05:06 PM
MikeMTJ
Quote:
Originally Posted by hughbertfd26 View Post
My 95 4 cylinder gets great gas mileage and its got more torque than most these hot rods and diesels in town. I can actually pop the front tires a couple feet off the ground if I'm driving in 1st or 2nd and stomp on the gas pedal. And that's pushin 33s with a 5 inch lift. 2.5s have plenty of power
You know what's funny? My 2.2L Toyota Camry from 1994 produces more HP and torque.

It also gets 30 mpgs.

Did I forget to mention it will go 180 mph and I can drive 20 miles while doing a wheelie?
05-16-2011 04:09 PM
Ibuildembig
Quote:
Originally Posted by hughbertfd26 View Post
My 95 4 cylinder gets great gas mileage and its got more torque than most these hot rods and diesels in town. I can actually pop the front tires a couple feet off the ground if I'm driving in 1st or 2nd and stomp on the gas pedal. And that's pushin 33s with a 5 inch lift. 2.5s have plenty of power
05-16-2011 04:07 PM
hughbertfd26 My 95 4 cylinder gets great gas mileage and its got more torque than most these hot rods and diesels in town. I can actually pop the front tires a couple feet off the ground if I'm driving in 1st or 2nd and stomp on the gas pedal. And that's pushin 33s with a 5 inch lift. 2.5s have plenty of power
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