2.5 is VERY underpowered... What more can I do? - Page 2 - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > 2.5 is VERY underpowered... What more can I do?

Alloy USA and Posi-Lok Cable Axle Disconnect Kits Dana 30 Ledlight bar light locks @ oconee off road 706 534 99551 Ton Heavy Duty Steering Upgrade Kit. New and Improved d

Closed Thread
Unread 10-23-2011, 04:43 PM   #16
leftlanetruckin
XJ on 37's
 
leftlanetruckin's Avatar
1998 XJ Cherokee 
 
Join Date: Jul 2006
Location: missouri via blackpool,lancs.
Posts: 10,453
Remove the 2.5/AX5 POS and place here...
dumpster.jpg

Been there and done it. By the time you screw around with the 2.5, the AX5 will take a dump. By the time you fix that, it will be back to feeling slow and then you will spend a fortune regearing the axles. Then the Dana turdy5 will go boom, and it continues.....
Grab a S10 blazer and a Ford 8.8 and swap teh motor/tranny/transfer case and rear axle and do it right.
Or sell it and buy a 4.0 YJ.

Martin

__________________
1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.The Cherylkee....
2003 Range Rover HSE, 4.4 Quad Cam.
1998 Range Rover 4.6 HSE
2000 4.7 4WD WJ with a rebuilt motor.
4.3/700r4/new frame buildup (YJ)....
http://www.jeepforum.com/forum/f12/swap-offically-underway-324622/

Years to gain the hands on experience, and offer it freely.
Minutes to gain the knowledge from the internet, and quote it just as freely.
Choose wisely!
leftlanetruckin is offline  
Unread 10-23-2011, 04:50 PM   #17
johnny27030
Registered User
1991 YJ Wrangler 
 
Join Date: Aug 2011
Location: Mt Airy, NC
Posts: 138
Quote:
Originally Posted by firstnationslw View Post
Are you sporting a hard or soft top? I think my hard top doesn't help matters but I'm in northern Vermont... hard tops are a necessity during northern winters.
Im running a soft top. Would love to find a hard top for the winter though
johnny27030 is offline  
Unread 10-23-2011, 05:01 PM   #18
UltimatE
Resident Audio Guru
 
UltimatE's Avatar
1994 YJ Wrangler 
 
Join Date: Sep 2004
Location: Worcester, Mass
Posts: 7,036
Quote:
Originally Posted by leftlanetruckin View Post
Remove the 2.5/AX5 POS and place here...
Attachment 294405

Been there and done it. By the time you screw around with the 2.5, the AX5 will take a dump. By the time you fix that, it will be back to feeling slow and then you will spend a fortune regearing the axles. Then the Dana turdy5 will go boom, and it continues.....
Grab a S10 blazer and a Ford 8.8 and swap teh motor/tranny/transfer case and rear axle and do it right.
Or sell it and buy a 4.0 YJ.

Martin
This. There really is no economic way to increase HP on the 2.5L. Even if you do, the AX-5 is the next weak link, followed by the rear end.
__________________
-Matt

White '94 YJ Sport
Black '98 ZJ Laredo - 45x60 Surco Rack - 2" Budget Boost, Addco Front Swaybar

Project (s)Low - A build log.
UltimatE is offline  
Unread 10-23-2011, 05:14 PM   #19
jonzjeepyj
Registered User
1992 YJ Wrangler 
 
Join Date: Oct 2008
Location: Bear, Delaware
Posts: 651
I agree that a motor swap is a much better power upgrade but the cost for
me to do swap my motor was completely unrealistic. I just couldn't afford
it. All of the 2.5L motor mods only cost me around $325.00, $200.00 of it
being the super coil and live wires. A motor swap would be in the thousands
of dollars to complete which just wasn't an option for me. For most of us,
it's about making the most of what we have and can afford. After all the mods
were completed on my little 2.5L YJ, it really had some pep with a lot higher
top end. No it will never be a 4.0L powerhouse but after doing all of the mods,
it preformed so much better. The Jeep had a smoother idol, more off the line
pep and would pull harder all the way through the power band. Now instead of
topping out and running out of power at 3800 rpms, it now accelerates and pulls
hard all the way through 5200 rpms. What a huge Improvement!
__________________
There is no problem that can't be fixed if you throw enough money at it.
jonzjeepyj is offline  
Unread 10-23-2011, 05:40 PM   #20
little_Jeep
Registered User
1998 TJ Wrangler 
 
Join Date: Nov 2006
Location: Louisville, KY
Posts: 5,929
Quote:
Originally Posted by jonzjeepyj View Post

There is no problem that can't be fixed if you throw enough money at it..... EXCEPT THE 2.5L

Fixed it for you.....
little_Jeep is offline  
Unread 10-23-2011, 06:09 PM   #21
94chb
Registered User
1989 YJ Wrangler 
 
Join Date: Dec 2009
Location: Whitwell, TN
Posts: 1,956
Take a look at this.

http://www.jpmagazine.com/techarticl...der/index.html
94chb is offline  
Unread 10-23-2011, 06:19 PM   #22
little_Jeep
Registered User
1998 TJ Wrangler 
 
Join Date: Nov 2006
Location: Louisville, KY
Posts: 5,929
Quote:
Originally Posted by 94chb View Post
So how long does the AX-5 and/or the D35 last once the turbo is in place?
little_Jeep is offline  
Unread 10-23-2011, 06:25 PM   #23
UltimatE
Resident Audio Guru
 
UltimatE's Avatar
1994 YJ Wrangler 
 
Join Date: Sep 2004
Location: Worcester, Mass
Posts: 7,036
Quote:
Originally Posted by 94chb View Post
From the website:

The base $2,999 kit includes...

You can just stop right there. $3k to polish a turd? Then you're still fighting reliability from the transmission and rear end, now adding a turbo stock engine on top of that.

For $3k you can have a v8 with a stronger transmission AND rear end.
__________________
-Matt

White '94 YJ Sport
Black '98 ZJ Laredo - 45x60 Surco Rack - 2" Budget Boost, Addco Front Swaybar

Project (s)Low - A build log.
UltimatE is offline  
Unread 10-23-2011, 06:30 PM   #24
leftlanetruckin
XJ on 37's
 
leftlanetruckin's Avatar
1998 XJ Cherokee 
 
Join Date: Jul 2006
Location: missouri via blackpool,lancs.
Posts: 10,453
Oh oh, the "the magazines did it, so it must be right" portion of the thread...
Over the years, magazines have loved stuff, then hated it a year later.
I have personally read in JP them saying the 2.5 is a POS, and get a 4.0. Far too many times for me to believe every word they say about making the 2.5 better.
Make a bet with someone.....I bet I can swap a 4.3/700r4/8.8 into a YJ for less money than a turbo setup done right. Now remember you have to make the weak AX5/dana turdy5 last too

Martin
__________________
1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.The Cherylkee....
2003 Range Rover HSE, 4.4 Quad Cam.
1998 Range Rover 4.6 HSE
2000 4.7 4WD WJ with a rebuilt motor.
4.3/700r4/new frame buildup (YJ)....
http://www.jeepforum.com/forum/showthread.php?t=324622

Years to gain the hands on experience, and offer it freely.
Minutes to gain the knowledge from the internet, and quote it just as freely.
Choose wisely!
leftlanetruckin is offline  
Unread 10-23-2011, 06:34 PM   #25
jonzjeepyj
Registered User
1992 YJ Wrangler 
 
Join Date: Oct 2008
Location: Bear, Delaware
Posts: 651
I'm personally doing a 4.0L swap. I found a 99 XJ with 96,000 miles on it as a
donor vehicle. It has the 4.0L Motor, AX-15 5-speed manual and the 31 spline
N-231-J T-Case, I bought the whole vehicle for $800.00. This way I can use
the wire harness, ECU, Alt, Starter, Rad etc etc . . . . I ran my little 2.5L motor
while I built my rig. I now want to upgrade the motor. I had to save and watch
for a deal to come along. I will be putting it in the weekend of Nov 7th.


I agree hands down that a motor swap it's a much better way to go
as I'm doing one now but talking from experence, I know what the 2.5L
motor is capable of. When all the upgraded mods are done together along with
re-gearing the axles, that little 2.5L Low Output Motor does just fine,
__________________
There is no problem that can't be fixed if you throw enough money at it.
jonzjeepyj is offline  
Unread 10-23-2011, 06:38 PM   #26
mazyj
Registered User
1991 YJ Wrangler 
 
Join Date: Oct 2008
Location: Baltimore
Posts: 418
First check everything out and make sure the engine is in fact running correctly- it sounds like it is though. If it is running correctly either get used to it, make friends with downshifting, or save money for a engine swap or new jeep. You can throw hundreds of dollars at a 2.5L and still be slow as hell. For the price you paid on the upgraded parts for the 2.5L you could have grabbed an engine from a junkyard and been on your way...

The 2.5L is a reliable motor and a Jeep is still awesome either way, either get used to it and enjoy it, or get a different motor. Otherwise your wasting your time and money and that's no fun.
__________________
91 wrangler 4.0L, 4 in Suspension lift, 1 inch Shackle Lift, 1 inch Body Lift, 35" BFG Mud Terrains, Warn Rockcrawler Front Bumper, Hand Throttle, HiLift, 12 pack of Natty Boh.
mazyj is offline  
Unread 10-23-2011, 06:50 PM   #27
jonzjeepyj
Registered User
1992 YJ Wrangler 
 
Join Date: Oct 2008
Location: Bear, Delaware
Posts: 651
Remember, all my upgrades together were only $125.00. I decided to also go
with the super coil and live wire combo for an additional $199.99. It wasn't
necessary but was an upgrade I wanted to do. I personally wouldn't do the
Turbo upgrade. To me the cost doesn't outweigh the benefit. Most of the
upgrades I did were either Free or very low dollar.
__________________
There is no problem that can't be fixed if you throw enough money at it.
jonzjeepyj is offline  
Unread 10-23-2011, 08:00 PM   #28
Xpress
Registered User
1989 YJ Wrangler 
 
Join Date: Dec 2010
Location: The Great Big Box, California
Posts: 5,805
There's a reason why the 2.5L is known as the iron brute and it's NOT because it's a pos . FWIW I think just upgrading to an electric fan would be enough to free up robbed horsepower, not to mention it would quiet the ride down. Ideally, you would only need 5-10hp at the most to get enough power.

Another thing:

IT'S A JEEP not some high speed sports car. With this theory in mind, I have no troubles driving highways. Why I was actually running a bit late to work this morning and I had no problems running at 75mph mostly the entire 6 mile freeway trip. Got there right on time.
__________________
[URL="http://www.jeepforum.com/forum/f12/another-5-2l-yj-thread-1503048/"]My 5.2L Build thread[/URL]

-1989 Jeep Wrangler 2.5L, soon to be 5.2L
-1996 Jeep Grand Cherokar 5.2L, donor and rainy day driver
-2004 Kawasaki KLR650 sunny day driver
[QUOTE=mudsweatNgearz;21162729]Leave em off and weld an I beam on. Bumperetts just scream homo.[/QUOTE]
"A well regulated Militia, being necessary to the security of a free State, the [B][I]RIGHT[/I][/B] of the people to keep and bear Arms, [B][I]SHALL NOT BE INFRINGED[/I][/B]."
Xpress is offline  
Unread 10-23-2011, 08:07 PM   #29
moonshinefuel
Registered User
1995 YJ Wrangler 
 
Join Date: Feb 2009
Location: Los Angeles. California. United States.
Posts: 4,911
There's not much you can do with the 2.5 power-wise. It's a good engine, but not your highway hill climber. I have no complaints with mine as I accept it as it is. Obviously a 4.0 is more powerful with a better transmission. But, jeeps can, and are built, and altered all the time. Quick fix is the 4.0. But for me, point a, to point b, is my primary concern, and my 2.5 has done this for me for many years. I just live with the fact that fully loaded semi trucks pass me going up steep highway hills. Other than that, it does just fine. To me, a small price to pay. I just bought an 8.8, and have an nv3550. Basically, this sets the ground work for a future V-8 swap if I choose.
So basically, live with it, and build it over time, or sell it and buy a 4.0. Either way is fine. It's all up to you.
__________________
AX5/NV3550 Conversion Thread. http://www.jeepforum.com/forum/f12/n...irrels-752742/
Bow Hunting www.bowsite.com
moonshinefuel is offline  
Unread 10-23-2011, 08:27 PM   #30
Old4X
Registered User
1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 4,810
The 4 popper matches the military Jeep's powerplant fairly well. It has decent offroad power, and has no problems at all keeping up with military highway convoys. Thing is, military convoy speed limit is 50 MILES PER HOUR!

The YJ with a 4 popper is the perfect chick car for a high school cheerleader. Lots of flash, but no go, it is in the same league as a Mustang with a 4 popper. It is mostly a styling ride with good looks.

Sell what you have (to some HS girl) and get a 4.0 HO equipped Jeep. If you want something with some real go, get one that has had a V-8 installed along with some beefier axles.

AS most have mentioned, you will NEVER get a 4 popper in a YJ to perform. And you will notice that no one that claims their 2.5 was improved by spending money on it can seem to find a dynamometer to back up their claims.
__________________
Rust free YJ for sale. Need more room in barn.
Old4X is offline  
Closed Thread

Tags
2.5 , power , YJ
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.