post #1 of Old 08-03-2010, 01:36 PM Thread Starter
BIGKID
Registered User
 
Join Date: Feb 2008
Location: alaska
Posts: 9
New here. 4 cyl question

Hello everyone. New to the Jeep thing. Wanted to know what you guys are doing to the 4 bangers to give it more power? Doesn't seem like I can do a hole lot.

Thanks

BIGKID is offline  
post #2 of Old 08-03-2010, 01:46 PM
77 renegade
Registered User
2004 TJ Wrangler 
 
Join Date: Feb 2005
Location: Rockingham,n.c.
Posts: 370
swap in 5.3 or regear to 4.88

WWW.WHEELINDIXIE.COM
77 renegade is offline  
post #3 of Old 08-03-2010, 01:49 PM
242TJ
Registered User
2003 TJ Wrangler 
 
Join Date: Mar 2008
Location: WA
Posts: 245
Regear to 4.56 or 4.88. Engine swaps are a lot of work. Make sure you do the tire/rpm calculations so you can still go on the highway.

Gear Ratio Calculator
242TJ is offline  
post #4 of Old 08-03-2010, 01:51 PM
phattboy001
Registered User
1997 TJ Wrangler 
 
Join Date: Dec 2009
Location: Iowa
Posts: 2
I put a cheap intake on from e-bay (~$35) and better ignition coil, it hasn't really done much for it tough. Contemplating the electric fan upgrade.
phattboy001 is offline  
post #5 of Old 08-03-2010, 01:53 PM
530ktm
Registered User
1999 TJ Wrangler 
 
Join Date: Jun 2010
Location: Southern Calif.
Posts: 185
I sold mine and bought the 6 cyl.
530ktm is offline  
post #6 of Old 08-03-2010, 02:00 PM
242TJ
Registered User
2003 TJ Wrangler 
 
Join Date: Mar 2008
Location: WA
Posts: 245
Quote:
Originally Posted by 530ktm View Post
I sold mine and bought the 6 cyl.
Unfortunately for the OP this is probably the best piece of advice.
242TJ is offline  
post #7 of Old 08-03-2010, 02:14 PM
everydayTJ
Registered User
1997 TJ Wrangler 
 
Join Date: Aug 2008
Location: Columbus,OH
Posts: 52
I've had my little 4banger as my daily driver for about 5 years now, it's got over 190k on the Odometer, and still running strong. After trying a variety of bolt-on bits, the only things that have made a noticeable difference to me were:

A) when I started using the K&N air filter (not the cold-air intake, just the slip-in)

B) replaced both my cat and muffler (nothing performance oriented, but depending on how old the vehicle is, there's a good chance the cat and/or muffler might be partially clogged and not operating at optimum efficiency)

C) started using seafoam motor treatment once a year or so (I have over 190k on mine, so I decided it's a small price to pay if this will help keep it running longer)

D) cleaning out my throttle body every year or so (also might as well clean the air ducting)

E) replacing spark plugs, wires, and distributor cap/rotor (every 12-15k)

Re-gearing is great if you can find some gears relatively cheap and have the know-how, but other than that, unless you want to drop hundreds of dollars on engine mods, just keep up with maintenance, and start saving money for a bigger engine

'97 TJ daily driver since 2004

There can be no divided allegiance here. Any man who says he is an American, but something else also, isn't an American at all. We have room for but one flag, the American flag, and this excludes the red flag, which symbolizes all wars against liberty and civilization, just as much as it excludes any foreign flag of a nation to which we are hostile. We have room for but one language here, and that is the English language, ... and we have room for but one soul loyalty, and that is loyalty to the American people.
-President Teddy Roosevelt (1919)
everydayTJ is offline  
post #8 of Old 08-03-2010, 02:17 PM
Demp
Registered User
2013 JK Wrangler 
 
Join Date: Apr 2010
Location: Mobile
Posts: 1,279
Quote:
Originally Posted by 530ktm View Post
I sold mine and bought the 6 cyl.
x3

Both the 4 and 6 cylinders are long running designs. The only way you'll get more power is serious upgrades/swaps. Been numerous threads about testing common "power mods" that gave nothing. Throttle body spacers, cold air intakes, K&N filters, performance chips, removing the catalytic converter (illegal btw): all give little to no noticable increase.

I think i read a post in the engine section where the guy got 2 more horsepower after half of those mods.

EverydayTJ is right, general maintenance and upkeep will help if its been let go. I would argue the benefit of the K&N though. When i had the slip in filter I noticed a fine dust building up inside the intake duct. I swapped back to paper and the buildup isn't occuring again. That dirt buildup can shorten an engine's life.
Demp is offline  
post #9 of Old 08-03-2010, 02:24 PM Thread Starter
BIGKID
Registered User
 
Join Date: Feb 2008
Location: alaska
Posts: 9
Thanks for all the advice. I will do the maintenance up keep.
BIGKID is offline  
post #10 of Old 08-03-2010, 02:27 PM
JealousDad
Registered User
1998 TJ Wrangler 
 
Join Date: Feb 2010
Location: Houston
Posts: 313
x2 on the tune up: new plugs, dist cap, rotor, and injector cleaner made a big difference.
The main thing, though is to get used to using the gears. The 4 cyl seems to bog easily, so keep the RPM's up. It really likes 3,000 to 4,000 rpm's!
JealousDad is offline  
post #11 of Old 08-03-2010, 02:34 PM
TJandMe
Registered User
1985 CJ7 
 
Join Date: Jan 2009
Location: Portland
Posts: 208
Seriously man. Save yourself a bunch of money and disappointment. If it is simply a Jeep TJ you want then enjoy what you have, but if you want a TJ with power, or even a noticeable amount of more tangible power than the 4cyl currently gets, then you should sell it and get a 4.0L.

No joke. I went through all of this (Full tune up, CAI, exhaust, 4.0L TB conversion, etc. etc. etc.). NONE of it does anything that you will notice in the 4cyl man except screw with your emissions. I finally just sold it and now, after driving a 345hp Hemi around for a while, am back in the hunt for TJ and so help me GOD it will not be, no matter what price, a GD 4cyl.

Good luck.
TJandMe is offline  
post #12 of Old 08-03-2010, 02:49 PM
97tjeff
Registered User
2008 JK Wrangler 
 
Join Date: May 2008
Location: Chicago
Posts: 614
my little 2.5 liter does pretty well on the trails and I get 20mpg on the highway.....
97tjeff is offline  
post #13 of Old 08-03-2010, 02:54 PM
TJandMe
Registered User
1985 CJ7 
 
Join Date: Jan 2009
Location: Portland
Posts: 208
Come on man, be honest. You know when you are on the highway and there is even the smallest amount of wind or long hill (even at a tiny tiny grade) you curse that 4cyl. Off-road is fine because you use the big pedal more than the skinny one. But even then, the 4cyl sounds like it is going to die a horrible death if you are forging water for more that 20 seconds.
TJandMe is offline  
post #14 of Old 08-03-2010, 04:16 PM
silver97tj
Registered User
 
silver97tj's Avatar
1998 TJ Wrangler 
 
Join Date: Aug 2004
Location: midwest usa
Posts: 626
Hi all

I too, alas have done this, but to no avail!..

Seriously, I tried intake, bored out TB etc etc. Just keep it stock and regular maintence. The 4.0 had more options but it is still a jeep. want more power, going to have to swap in a V8, ....................good luck...


BTW, decades of jeeps, 4 plus, all 4cyl, go figure!.....................

1998 Blue TJ, 4 Cyl., Auto (30rh), Hardtop with installed Sunroof, mostly stock.
31x10.5x15 Mud Tires, TJ Rubicon springs, Mopar Deep Trans Pan and Cooler
Army Vet and proud of it! Have you served your country?
Support our Troops!! Thank You!!!
silver97tj is offline  
post #15 of Old 08-03-2010, 04:24 PM
gensysmike
Registered User
1998 ZJ 
 
Join Date: Jun 2007
Location: Dallas
Posts: 143
My 2.5 blew up and I upgraded to 4.0. The power comparison is not even close. Like the guy was saying a above, I used to curse the wind. It is no sports car, but it has power to spare.
gensysmike is offline  
Reply

Tags
4 cyl , 4-cyl , more power , performance , tj , wrangler


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Lift/Tires question and Cleaning soft top & engine question Bryan_16 TJ Wrangler Technical Forum 16 05-19-2012 03:25 PM
Front sway bar question + bonus disco question WranglerTom TJ Wrangler Technical Forum 7 12-02-2011 08:13 AM
1988 carberator question and wiring (general) question prljeep YJ Wrangler Technical Forum 15 05-08-2009 11:50 AM
quick connecting rod question and tourqe wrench question???? johnrezz YJ Wrangler Technical Forum 2 10-18-2008 07:20 PM
Tire question(noob question but just a quick answer needed) 07SilverX JK Wrangler Technical Forum 3 12-25-2007 03:35 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome