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Old 02-04-2014, 09:04 AM
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Lifts on a 2.5L

Hey! My question is, how much, if anything, can you do (as far as lifts and tires go) to a 2.5l without feeling like your engine is struggling?

Thanks!
Sean

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Old 02-04-2014, 09:08 AM   #2
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I dont see how a lift will effect your engine. As far as tires i believe its all about gearing.

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Old 02-04-2014, 09:20 AM
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Hmmm, I've read on some posts that if you try to put a lift with bigger tires on a 2.5, you'll be noticeably sluggish.
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Old 02-04-2014, 09:26 AM   #4
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What i meant to say is the lift itself shouldn't bog your engine other than maybe adding a little extra air drag but then again your driving a box. Going up in tire size will bog your engine and you would probably want to consider a regear. There's people with more knowledge about what gears for what tires and hopefully they'll chime in and help.
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Old 02-04-2014, 10:19 AM   #5
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The lift won't cause the engine to feel sluggish that's what the larger tires do.


An easy explanation would be take a 21speed moutain bike.


Put it in 21st gear and pedal up a hill. It's hard you struggle that is cause your under-geared


Now try again with the bike in 1st gear. It'll be much easier because your properly geared.


Thus the reason people regear with 33's and larger.
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Old 02-04-2014, 10:38 AM   #6
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A 33" tire is where most people start to notice enough 'sluggishness' to want to re-gear their 2.5L. I personally have 33's on mine with stock gears and it doesn't bother me at all. The only downside I've seen is that I have to downshift more often when going up hills. It's all personal preference. Then again, if you were concerned about going fast you wouldn't have gotten a 20+ year old 4-banger jeep.
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Old 02-04-2014, 10:52 AM   #7
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The manual transmission, 4 cylinder Wranglers came with 4:10 gears which helps alot. The 6 cylinders have 3:73 (I think) gears. So 31" tires should be no problem. 33's are driveable, but you'll notice it. You can always add the gears later once you see how it feels.

It's the extra weight and power needed to push them tires that cause it to be sluggish. In low gear you'll still have power. Depends on what type of wheelin' you do.
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Old 02-04-2014, 11:29 AM   #8
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Quote:
Originally Posted by Scott-CJ8 View Post
The manual transmission, 4 cylinder Wranglers came with 4:10 gears which helps alot. The 6 cylinders have 3:73 (I think) gears. So 31" tires should be no problem. 33's are driveable, but you'll notice it. You can always add the gears later once you see how it feels. It's the extra weight and power needed to push them tires that cause it to be sluggish. In low gear you'll still have power. Depends on what type of wheelin' you do.
My 6cyl has 3.07's.
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Old 02-04-2014, 12:32 PM   #9
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I believe the manuals came with 3.07 and the autotragics come with 3.73 or something like that.

4 cylinder YJ's come with 4.10's, up until 1994 when they added a 3 speed autotragic with 3.73 gears.
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Old 02-04-2014, 02:11 PM   #10
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There's no right or wrong answer for this - it depends on your personal expectations for performance, acceleration, highway speed, etc. Some people will say 29" tires. Some 33".

I think 30" or 31" is the max I would recommend with stock gearing and the 2.5L. I have 32" tires, and it's horrible on the freeway. But I do a lot of freeway driving. Around town, it's fine. It helps to have the manual transmission, as you can pick your own shift points. It also depends on how heavy your Jeep is. Armor, hard tops, junk, winches, etc, add a bunch of extra weight, and can make a 2.5L Jeep even more sluggish.

Doing a big suspension lift and body lift does make the Jeep less aerodynamic, but you'll mainly feel that on the highway.

As a side note, I'll be doing a 4.0L upgrade within the next couple of months to gain back some performance.
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Old 02-04-2014, 10:40 PM   #11
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if you want to run 33s you will want 4.88 gears.. i did this with my 4 banger and it runs good on the road and great in the desert
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Old 02-06-2014, 07:16 AM   #12
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I have 32/11.50s on my 2.5l and it does good through 4 th gear 5 th gear not so much. Any wind at all or ant incline In the road and it stays in 4th. Putting 33/12.50s on it today so regearing to 4.88s with spartan lockers
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Old 02-09-2014, 12:24 AM   #13
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I have a 2.5l with a 4in lift and 33x12.5in tires and it runs great highway not so much and my gas milage sucks I can get up to 70 if I stay in 4th no power at all in 5th but on the low end its great i just went mudding and it powered through everything a couple of my buddies got stuck where I powered through
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Old 02-09-2014, 10:13 AM   #14
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X2 best money spent was 4:88s on 33s.

It's still a four banger and in long hills it is still slow. But overall best mod yet.

I also put an 8.8 in the rear. Peace if mind.

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