Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum > 4.0 Wrangler Lacking Grunt

Join Wrangler Forum Today


Thread: 4.0 Wrangler Lacking Grunt Reply to Thread
Title:
  
Message:
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Additional Options
Miscellaneous Options

Topic Review (Newest First)
06-26-2013 10:18 AM
UnlimitedLJ04 what tire size are you running, and what's the gear ratio in the axles? how about transmission, and year of vehicle?

FWIW, the main things you can do to the 4.0L to gain real horsepower and torque numbers, include adding forced induction (supercharger/turbo), a stroker (4.2L/4.0L hybrid engine), or head/cam/valvetrain work. all those will also need a piggyback ECU & dyno tuning.

if you have larger than stock tires, you need to regear the axles to put the engine back into it's powerband. even with the above mods, or a V8 swap, you still need proper gearing.
06-24-2013 07:50 PM
breed56 I did the K & N, chipped it, and did some throttle Body work and exhaust work and got about 15% all with cheap bold on stuff! Jeep seems to flat get with it here in Northern Nevada and really good Off Road, gas mileage sucks cuz I put my foot in it a great deal, Good Old School jeep.
06-23-2013 01:37 PM
Maverick1066
4.0 Wrangler Lacking Grunt

Just bought my beast off Ebay -great fun vehicle, tidy mechanicals, Full Years NOT, wax-oiled and good chassis etc,,

Just a Tad disappointed about the power ( for a 4.0L), does not pick up very smooth through the gears, and 5th is for downhill only!

Have ordered a 'Service kit' to start with: Plugs, leads; dizzy cap; rotor etc, but would appreciate any help here as to where to go next.

Have read about the intake airbox, possible K&N Conversion kit ?

Thanks in advance for any suggestions


Posting Rules
You may post new threads
You may 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


All times are GMT -5. The time now is 02:16 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC