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Old 02-17-2014, 08:15 PM   #1
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Not happy with 2.5L engine

Hey Guys, I need some cheering up to get out over my weak 2.5L engine. Just came from a mechanic (suppose to the best in town) to get an opinion on getting more power out of my 4 banger. He wouldn't even look at it. The guy has been in business for 30 years and said he would not even work on a 2.5L jeep engine. They're just not worth it he said. I know most of you will say "swap it out". Well...I live in the state of California and because of our emissions laws here, I don't think a 350 blocks are allowed. I guess I will have to live with never being able to shift to 5th gear. Makes me want to move out of Cali. How many are happy with their 2.5L engines?


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Old 02-17-2014, 08:17 PM   #2
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Hey Guys, I need some cheering up to get out over my weak 2.5L engine. Just came from a mechanic (suppose to the best in town) to get an opinion on getting more power out of my 4 banger. He wouldn't even look at it. The guy has been in business for 30 years and said he would not even work on a 2.5L jeep engine. They're just not worth it he said. I know most of you will say "swap it out". Well...I live in the state of California and because of our emissions laws here, I don't think a 350 blocks are allowed. I guess I will have to live with never being able to shift to 5th gear. Makes me want to move out of Cali. How many are happy with their 2.5L engines?
What size tires/lift/gears u running?

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Old 02-17-2014, 08:31 PM   #3
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Gears will kick the crap outta any mod you do to the 2.5. Your mechanic was right on. Don't touch the motor. See what h wants to install 4.56 front and rear:...
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Old 02-17-2014, 08:54 PM   #4
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Got some Goodyear wrangler 33's. Not too sure about the lift and gears but I will have an answer for you soon. Lift and gears were in place when I bought it.
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Old 02-17-2014, 08:54 PM   #5
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i put 4.88 gears with 33 tires and it works ok. it still dont like the freeway.
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Old 02-17-2014, 09:01 PM   #6
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How fast does it go on the highway?
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Old 02-17-2014, 09:07 PM   #7
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How fast does it go on the highway?
it can do 70 if you put your foot to the floor and hold it there on flat land..lol
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Old 02-17-2014, 09:20 PM   #8
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He's right. I have never gone faster than 70 on flat road. Always 3rd gear going up hills. So are you saying the regearing didn't do much?
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Old 02-17-2014, 09:39 PM   #9
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My 2.5 never sees 5th gear. Running 35 bfg a/t. Total of 6 inch lift. Stock front and rear gears.
But it sure is fun to drive regardless.
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Old 02-17-2014, 09:45 PM   #10
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I have a 90 4.2 and never get much over 70 unless going downhill, and I never use 5th gear, so I don't think the 6 cyl is much better. Where in CA do you live? There is a good Jeep shop in the IE.
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Old 02-17-2014, 09:55 PM   #11
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2.5L with 33's and 4.10 gears here.
I think I used 5th gear one time going down a long hill. I also have to grab 3rd uphill on the interstate. I also have been told to re-gear with 4.88.
I have other plans to re-power in the future so just going to live with the 4 cyl. of fury until I do.
The 2.5L seems to be reliable little motor. If you don't have any plans to swap the motor and just really tired of being the slowest on the road.. .... Look into re-gearing.
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Old 02-17-2014, 09:57 PM   #12
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I live in Vallejo. Its about 35 min from San Fran and 1 hour from Sacramento.
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Old 02-17-2014, 10:09 PM   #13
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I live in Vallejo. Its about 35 min from San Fran and 1 hour from Sacramento.
Ok. My son-in-law was stationed in Vallejo with the Coast Guard. You can put a bigger engine in your Jeep as long as it's from the same year or newer and you keep all the original smog equipment. A friend of mine swapped in a 6 cyl Jeep Cherokee engine into his. You have to register the swap with the DMV and of course it must pass smog. But it can be done.
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Old 02-18-2014, 01:06 AM   #14
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4.88 is the proper gear ratio for hauling 33's around with a 2.5L. I had a 93 YJ for about 10 years with a 2.5 and 33's.

There are a bunch of mods that can be done to pick up a little here and a little there for the power dept. But, you have to look at it this way...a stock 2.5L came from the factory with it rated at 123HP. Its a struggle to haul 33's around. Proper gearing means everything.

It wont be the fastest rig out there, and you still might not get to use 5th gear all that much, I never did. But then again I live in the mountains of Pa. Most of the time I didn't get to use 4th gear.
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Old 02-18-2014, 04:38 AM   #15
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Since we are on the subject of getting more power, I'm about to buy a nice used factory original hardtop. Would the added weight make matters worse with my current condition?
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Old 02-18-2014, 05:02 AM   #16
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You don't like the four, sell it and get a six! Want speed, buy a Porsche. Its a Jeep!!!!! The 4's are great little engines. From your profile pic, you have a very nice Jeep. Use it and enjoy it for what it is. Besides, from what I remember about being in CA in the 1980's, it is VERY rare to be able to drive 50 on the freeways let alone 70! Enjoy what you have. Have a beer.
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Old 02-18-2014, 06:12 AM   #17
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you don't like the four, sell it and get a six! Want speed, buy a porsche. Its a jeep!!!!! The 4's are great little engines. From your profile pic, you have a very nice jeep. Use it and enjoy it for what it is. Besides, from what i remember about being in ca in the 1980's, it is very rare to be able to drive 50 on the freeways let alone 70! Enjoy what you have. Have a beer.
x2
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Old 02-18-2014, 06:45 AM   #18
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You don't like the four, sell it and get a six! Want speed, buy a Porsche. Its a Jeep!!!!! The 4's are great little engines. From your profile pic, you have a very nice Jeep. Use it and enjoy it for what it is.
x3


Did you test drive the Jeep before you bought it?
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Old 02-18-2014, 08:33 AM   #19
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x3

Did you test drive the Jeep before you bought it?
Yes I did test drive it but there were no hills in the area.
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Old 02-18-2014, 08:44 AM   #20
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cheapest bet might be to sale it before you put any more money in it and then buy one with a bigger engine
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Old 02-18-2014, 09:05 AM   #21
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I'm okay with the jeep. Trust me guy...too much has already been invested. Again...its my fun toy. Thats why I have a tire cover with "TONKA" written across it.
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Old 02-18-2014, 11:26 AM   #22
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Well, you said you needed cheering up, so i'll give it a try:

The 2.5 is a fine motor. Dependable, simple & easy to work on. Parts are readily avaliable at most parts houses. It makes 120 hp at the crank with nothing attached to it. Figure in driveline losses, age & normal wear & tear & you're lucky to see 100hp to the rear wheels.

It's no power house, but it'll get you where you need to go. I think once you get use to driving it, you'll be ok.
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Old 02-18-2014, 12:24 PM   #23
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Well, you said you needed cheering up, so i'll give it a try:

The 2.5 is a fine motor. Dependable, simple & easy to work on. Parts are readily avaliable at most parts houses. It makes 120 hp at the crank with nothing attached to it. Figure in driveline losses, age & normal wear & tear & you're lucky to see 100hp to the rear wheels.

It's no power house, but it'll get you where you need to go. I think once you get use to driving it, you'll be ok.
Yeah, what he said.

And by the way, just a small apology to the OP for my previous post. A few days ago I posted about getting a carb for my 2.5. I should follow my own advice…If I wanted a vehicle with a carb, I should have bought one! Now…how about that beer!
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Old 02-18-2014, 01:24 PM   #24
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Okay guys....got my first quote on regearing the jeep. 1700 for both front and back
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Old 02-18-2014, 01:33 PM   #25
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That isn't extreme, but a little high priced. Go to www.eastcoastgearsupply.com. That will give you an Idea of how much it will cost for the parts.

You will need the gears for each axle also known as ring and pinion. As well as a master rebuild kit for each axle, which includes all of the bearings and seals.

If you research the prices for the gears and kits, you will have a better idea on what would be a good price for a gear swap.
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Old 02-18-2014, 01:43 PM   #26
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Originally Posted by wrangler_bear View Post
Hey Guys, I need some cheering up to get out over my weak 2.5L engine. Just came from a mechanic (suppose to the best in town) to get an opinion on getting more power out of my 4 banger. He wouldn't even look at it. The guy has been in business for 30 years and said he would not even work on a 2.5L jeep engine. They're just not worth it he said. I know most of you will say "swap it out". Well...I live in the state of California and because of our emissions laws here, I don't think a 350 blocks are allowed. I guess I will have to live with never being able to shift to 5th gear. Makes me want to move out of Cali. How many are happy with their 2.5L engines?

I live in Vacaville. Yes you can do a legal motor swap if you want to. The Referee at the smog shop gave me the lowdown. The motor you put in must be the same year or newer as your jeep and must meet all the smog requirements of the year of the motor. I was looking at putting in a Cumins diesel. He said yes, as long as its the right motor. As for the gears, mine is in getting gears and Elockers right now. 4.88's front and rear, super 30 kit in front. There are some legal upgrades you can do that will help. Electric fan, high flow cat back exhaust, 4.0 throttle body, 19lb injectors etc. Read this thread.
2.5 performance mods
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Old 02-18-2014, 03:37 PM   #27
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Just take the top and doors off, women wont care how fast you go!!!!
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Old 02-18-2014, 03:45 PM   #28
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Just take the top and doors off, women wont care how fast you go!!!!
x1 yeeeeeehhaaaaaa
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Old 02-18-2014, 03:51 PM   #29
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Makes me want to move out of Cali. How many are happy with their 2.5L engines?

It's a Jeep Wrangler! I'd be happy with any motor lol. But a 4.0 was more realistic to me (I have a 2k lb tent trailer).

20 years ago I moved out of Stockton, Ca to Medford, Or and it was the BEST thing I ever did in my life. It's illegal to pump your own gas here, only 2 areas have Smog and it's $10 IF YOU PASS (State ran inspection). But in Eugene, there is NO smog checks at all. My Registration for a 1979 F250 in 1990 was $123/year in Cali. In Oregon it's now $80/2 years no matter what you drive. No Sales tax either . And our Licenses last for 8 years without renewal. Personally, I wouldn't shed a tear if Cali fell in the Ocean LOL

If you really want some more power though, swap it in for a 4.0 or Turbo it. There was a article on a guy who do some boring, couple addons and was VERY close to the 4.0 Horsepower. If you want I can find the link again. But don't think it would Pass Cali emissions (been to long for me to remember emissions crap lol)
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Old 02-18-2014, 03:55 PM   #30
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Just take the top and doors off, women wont care how fast you go!!!!
If you got a Jeep just to get girls then you are either really ugly or you have a little tiny......

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