98 4.0L getting the 99+ intake swap, vacuum routing? - JeepForum.com

 
LinkBack Thread Tools
post #1 of 9 Old 05-14-2009, 01:27 PM Thread Starter
MeWJWifeZJ
Registered User
1996 ZJ 
 
Join Date: Sep 2008
Location: Richfield
Posts: 518
98 4.0L getting the 99+ intake swap, vacuum routing?

Who has done this conversion before? Should I use the old injectors and wiring or splice the newer stuff in? Also, where do the vacuum lines get re-routed to? The tees are not in the same spots and I am unfamiliar with the types of Vacuum the 4.0L puts out.


Praise to a Child is like Sunlight to Flowers

Traded away the WJ to get a commuter

We finally got another Jeep after 5 years without. Too bad it's ALL stock.
MeWJWifeZJ is offline  
Sponsored Links
Advertisement
 
post #2 of 9 Old 05-15-2009, 03:49 PM Thread Starter
MeWJWifeZJ
Registered User
1996 ZJ 
 
Join Date: Sep 2008
Location: Richfield
Posts: 518
btt, hoping to do the swap this weekend.

Praise to a Child is like Sunlight to Flowers

Traded away the WJ to get a commuter

We finally got another Jeep after 5 years without. Too bad it's ALL stock.
MeWJWifeZJ is offline  
post #3 of 9 Old 05-15-2009, 06:53 PM
bucko132
Registered User
1997 ZJ 
 
Join Date: Jul 2008
Location: naperville IL
Posts: 84
im new to zj's what is the advantige of doing this?
bucko132 is offline  
post #4 of 9 Old 06-01-2009, 08:15 AM Thread Starter
MeWJWifeZJ
Registered User
1996 ZJ 
 
Join Date: Sep 2008
Location: Richfield
Posts: 518
20-35 HP increase, bump in torque, bump in MPG. The HP gain was documented in a thread on a dyno

Praise to a Child is like Sunlight to Flowers

Traded away the WJ to get a commuter

We finally got another Jeep after 5 years without. Too bad it's ALL stock.
MeWJWifeZJ is offline  
post #5 of 9 Old 06-01-2009, 09:12 AM
squashman702
Registered User
1994 ZJ 
 
Join Date: Aug 2007
Location: Allston
Posts: 4,419
Quote:
Originally Posted by MeWJWifeZJ View Post
20-35 HP increase, bump in torque, bump in MPG. The HP gain was documented in a thread on a dyno
With supporting mods. The guy that gained this much over on Mallcrawlin had a pretty extensive build. It looks like 5 hp or so is expected if done without anything else.

Think Twice Garage
"I guess I'd just run it?"
squashman702 is offline  
post #6 of 9 Old 06-01-2009, 09:27 PM
muddyjgc
Registered User
2005 WK 
 
Join Date: Mar 2007
Location: St. Louis
Posts: 212
I did the upgrade on mine about a year ago, here is a pic of the new setup.

The pic explains most of it. I plugged the two outer ports on the ends of the intake and used the center port for the vac line that runs to the purge solenoid, by turning the rubber elbows you can get that line to work.
I also had to extend the wires that go to the Intake air temp sensor since the 99+ intake has the sensor on the opposite side of the throttle body.
The bracket that holds the hard fuel line that runs under the intake wont work with the new intake without being modified. I haven't gotten around to modifying mine, the fuel line seems to be fine without it.

I used all my old injectors, fuel rail, brackets, Intake temp sensor,and
throttle body.

You won't see much difference in performance, just a little more low end ummph. I saw no mileage increase.

If you have any questions give me a shout.

On Edit: I just realized that this thread is 1/2 a month old. Did you get your intake installed?





Last edited by muddyjgc; 06-01-2009 at 10:00 PM.
muddyjgc is offline  
post #7 of 9 Old 06-01-2009, 09:31 PM
elmer_fud
Registered User
1995 ZJ 
 
Join Date: Jan 2008
Location: colorado
Posts: 2,457
I would say use the same injectors. I wouldn't be surprised if jeep changed the fuel rail pressure when they went to the WJ

Brian
95 ZJ, 5.2 V8,160,000 miles
Colorado Jeep Club member Pi
Quote:
Originally Posted by Speedycat View Post
I am not one to be changing lanes at 70 mph on a lifted truck on 33's, but since I am in Miami, I have to be prepared for the continuous influx of new drivers whose previous ride was a bicycle with wooden wheels.
Quote:
Originally Posted by FPKites View Post
badger, badger, badger, badger, badger, badger, badger, badger, badger, badger, badger, Mushroom!!! :D
Quote:
Originally Posted by ZeeJay1997 View Post
Or just tie a 12 lb fish to a one foot pipe.
elmer_fud is offline  
post #8 of 9 Old 06-01-2009, 11:50 PM
JrMechanic
Registered User
1993 ZJ 
 
Join Date: Oct 2008
Location: Lima, Ohio
Posts: 3,370
Quote:
Originally Posted by elmer_fud View Post
I would say use the same injectors. I wouldn't be surprised if jeep changed the fuel rail pressure when they went to the WJ
To use the WJ Injectors you need an adjustable regulator like the Hesco one.

muddyjgc: How much low end did it give you? Anything at highway speeds? I've been debating on doing it to mine for awhile now, I can get the intake from a friend but I need a power steering pump and bracket from a 96+ (I have a 93) so it would cost me over $100 to do the mod. For what it would cost me, I figure I could put out a little more coin and just slap a cam in...

Want to swap an NP242 or NP231 into your ZJ? Here's how:
http://www.jeepforum.com/forum/f13/n...pdated-685644/
JrMechanic is offline  
post #9 of 9 Old 06-02-2009, 08:52 PM
muddyjgc
Registered User
2005 WK 
 
Join Date: Mar 2007
Location: St. Louis
Posts: 212
Quote:
Originally Posted by JrMechanic View Post
To use the WJ Injectors you need an adjustable regulator like the Hesco one.

muddyjgc: How much low end did it give you? Anything at highway speeds? I've been debating on doing it to mine for awhile now, I can get the intake from a friend but I need a power steering pump and bracket from a 96+ (I have a 93) so it would cost me over $100 to do the mod. For what it would cost me, I figure I could put out a little more coin and just slap a cam in...

Not a whole lot. Probably not over $100 worth of power. I seemed to have a little more pickup off the line. Mine only cost me $25 from pick-n-pull, and was a direct bolt-on.

The intake is supposed to be good for about 15 hp. Supposedly Jeep had to restrict the exhaust ports to make the 4.0 meet new emissions, at a cost of 15hp. So they redesigned the intake to flow better to get the hp back.
muddyjgc is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

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.




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
5.9 intake manifold vacuum lines Texas ZJ1 ZJ Grand Cherokee Forum 15 05-18-2009 09:24 PM
WJ->ZJ intake swap JrMechanic ZJ Grand Cherokee Forum 16 04-11-2009 01:09 AM
Vacuum hose routing pics/diagrams hmmhoyhoy ZJ Grand Cherokee Forum 0 11-16-2008 02:17 PM
air intake swap? legend6009 ZJ Grand Cherokee Forum 2 02-19-2007 06:38 PM
4.0l intake swap S_L_W ZJ Grand Cherokee Forum 9 11-25-2006 08:45 PM

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
Trackbacks are Off
Pingbacks are On
Refbacks are On

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