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Old 04-17-2014, 03:03 AM   #1
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4 cyl 2.5 L tips!

I have a 1990 2.5 , 4 cyl, 5 speed manual tranny.. And I was wondering if anyone had any tips to give it some balls! I'm tired of the Barbie car look.. My jeep mechanic said it's hard to lift the 4cyl because they have a huge power loss and is hard on the car... Anyone have any tips on how to beef it up a little? What are the biggest size tires I could put without losing power or rubbing? Any ideas would be greatly appreciated! Here's some pics..

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Mines the red one.. Lol
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Old 04-17-2014, 04:31 PM   #2
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Wrong section of the forum but I have a 2.5L with 2.5 in of suspension lift and 1 in shackle lift. I run 32" tires with no problems

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1995 YJ 2.5L 4cyl, 2.5 in. Rugged Ridge Lift, 1 in. Lift Boomerang Shackles, 32 in. Kenda Klever MT Tires, G.E.A.R Seat covers, Rear mounted Jerry Can, Smittybilt SRC Sliders, Rear Bumper, and Rear Corner Guards with Flat flares, EAUTOGRILLES Front Flat Fender Flares, EAUTOGRILLES Stinger Bumper, Quadratec 9000 lbs. Winch. Still more to come eventually!!!
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Old 04-17-2014, 05:12 PM   #3
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Well the first thing would be to replace the motor with the 4.0 or a V8 but I know that's probably out of the range atm.

But your mechanic is right. The 2.5 is just too dang lethargic when you start lifting too high and adding Tire sizes. It can do decent, don't get me wrong but I know a lot more people wish they had the 4.0 instead of the 2.5.

Anyways, the rear axle gearing will be the biggest thing that you can do to it short of getting a different motor. Base the gearing on the size tire and lift you want to do.

Mines a 3.5" spring with 1" body and 31x10.5. With that setup I'd be "perfect" with 4.10's. Right now I have 3.55 and it doesn't do TOO bad but I feel the strain in 5th at 60.
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Old 06-24-2014, 06:31 PM   #4
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I have a stock 2.5 I have 33s with a 4 in lift and runs great no race car but off road it does great
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Old 06-24-2014, 08:14 PM   #5
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my first yj had the 2.5 5 speed,,i put a 4inch suspension lift on it ran 33x12.50 mud tires,,i went everywhere a guy on here went with his AEV rubicon i just had to wheel in low gear and 3rd..
as far as on road just fine around town but i lost 5th gear on the steep hill,s here in eastern ky.
you can regear and get your power back that way...but i saw no need in it..for my use. i could cruise the highway at 60mph but if pushed 70mph was it and alot of strain
we drive yj,s not muscle cars.they are what they are..lol
i now have a 94 with the 4.0 5 speed..pretty good upgrade...but dont let that little 2.5 keep you down...its slower but its a little beast and hard to break...
the weakest link in any yj is the weak rearend..
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4inch suspension lift,3inch body lift,4.0 5 speed,8.8 with disc,s,16inch moto metal rims ,and some 35s..
with trail rash..and getting 25mpg,s
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Old 06-25-2014, 02:03 PM   #6
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I have a 4" lift with about 32" (metric conversion from 255/75/17) tires on my 2.5 YJ. They are narrow though. I don't have any issues. I have to downshift for steep hills but that's no biggie. Not many hills down here by the beach except for bridges. I wouldn't go bigger than 33s. Not only for the power loss but for the strain on the weak rear end (assuming it's stock D35). If you're worried about power loss look into a narrower tire like a 33x10.50 to keep the weight down.
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Old 07-03-2014, 11:34 PM   #7
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i wish there was a small turbo for these 2.5s but does pretty good . i am from a little different perspective as for performance i am looking for an efficient small ci engine like my 4 cyl providing a lot less weight and plenty of torque with the correct boost it would be a great little rig if any one knows of any companys with a cheap answer



90 jeep wrangler
Pro comp4 1/2" lift / coil conversion
15" weld wheels
33"wrangler tires
Dana 30, 35

L4 5 speed manual
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Old 07-05-2014, 11:00 AM   #8
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I feel your pain. I have a '93 YJ that is bone stock, no lift or aftermarket tires. It too is a 2.5L 4 cylinder. I am looking at getting a 2.5" lift and then go with either 31 or 33x10.5x15s using the stock rims.

You can see how wimpy mine looks as is.
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Old 07-05-2014, 09:15 PM   #9
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not wimpy looking and your canyon rims are probably 8inch wide..

i need 3 yj,s
1-rock crawler
2- mud machine
3-mall qeen..
4-all stock
5- and i would love to rat rod a yj..really
6- the 3 i said i need went up as i was typing,,,,i need a bunch of yj,s...l0l
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4inch suspension lift,3inch body lift,4.0 5 speed,8.8 with disc,s,16inch moto metal rims ,and some 35s..
with trail rash..and getting 25mpg,s
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Old 07-19-2014, 11:01 PM   #10
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Beefy tires

I just put 30 x 9.50 15" Cooper AT on mine. It doesn't give a lot of lift but I'm happy with the look plus it has decent clearance. It also does 70 mph without a lot of noise on the hwy.
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Old 09-10-2014, 02:54 PM   #11
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Quote:
Originally Posted by RosaWrangler93 View Post
I have a stock 2.5 I have 33s with a 4 in lift and runs great no race car but off road it does great
Amen i went through the 2.5 regrets till i put it off rd. then i realize its a jeep it is meant to go anywhere just cant be i a hurry to get there..lol
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Old 09-10-2014, 02:58 PM   #12
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It's almost the same power as a 4.0 but at a fraction of the fuel
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Old 09-10-2014, 02:58 PM   #13
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Quote:
Originally Posted by azoroc View Post
i wish there was a small turbo for these 2.5s but does pretty good . i am from a little different perspective as for performance i am looking for an efficient small ci engine like my 4 cyl providing a lot less weight and plenty of torque with the correct boost it would be a great little rig if any one knows of any companys with a cheap answer



90 jeep wrangler
Pro comp4 1/2" lift / coil conversion
15" weld wheels
33"wrangler tires
Dana 30, 35

L4 5 speed manual
I have looked there is a turbo for the 2.5 but its about 3 grand sorry no cheap answer on the turbo.
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Old 09-11-2014, 08:44 AM   #14
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I don't think our 4 cylinder looks very Barbie!



Ford 8.8 rear end, 3.5" Black Diamond Suspension lift, on Interco 33s.
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Old 09-12-2014, 11:35 AM   #15
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I started putting on a RE 2.5" lift. I have the front springs and shocks and it's done! Also picked up some 31x10.5x15s that I will be using to replace the much needing to be replaced tires. I'll post pics when done. I am driving a 2.5 too BTW.
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Old 09-12-2014, 11:53 AM   #16
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I got the same lift. 2.5 RE lift with 33x13.50x15
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Old 11-09-2014, 08:59 PM   #17
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I have a 95 with the 2.5.
I put a 2 1/2'' lift and 31 x 10.50's...
Stock dana axels and 4:10 gears.... yeah 5th is pretty long legged, but I didn't buy it to go 75 on the freeway... I got it because it's a jeep and it goes great slow!
When I bought it, it had stock tires.... I didn't really notice a huge difference by switching tires... the lift doesn't put any drag on the motor...
I did have to drop the T/C 1''to get the vibration out of the driveline... but other than that it's pretty much stock...
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Old 11-09-2014, 09:02 PM   #18
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Last year after I bought it and now..
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Old 11-11-2014, 03:23 PM   #19
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If you did a axle swap to a 44/8.8, 44/9in or a 44/44 combo you could build a nice 2.5 that does great on the street. The problem with the 2.5 is the stock axles suck. Once you can regear the 2.5 with some 5:13's or better the little motor comes to life. That doesn't mean you can't enjoy your jeep in stock form. 31's, add a leafs and tj fender flares.

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