Couple of questions about my YJ - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 01-19-2004, 09:33 AM
big87YJ
Guest
 
Posts: n/a
Couple of questions about my YJ

Hi all, this is my second post on these boards. I just bought a 87 yj that needs some work and i had hoped you guys/girls can help. Firstly...it needs a new muffler. do i buy a cheap cruddy muffler, or do i go all out and get a borola or something nice? Is the price of the borola worth the performance? Second....I'm runnin 35's so I want to increase the horsepower of the wimpy but sturdy 4.2L engine. What are some cheap ways you can do that? Lastly... i think i need to replace the carborator. Do I buy a used stock one for $40, or get an aftermarket upgrade. I hear the stock ones can have problems at higher grades but I do mostly mud and trail adventures, not alot of hard climbing. Thank you in advance for answering any or all of the questions!! See ya on the trails!
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 01-19-2004, 10:48 AM
Can't Get Enough
 
Tippy's Avatar
 
Join Date: Feb 2001
Location: Alliance, Ne
Posts: 1,423
Thanks: 1
Thanked 0 Times in 0 Posts
 
Re: Couple of questions about my YJ

Hi. Thanks for stopping buy. There are a lot of things you can do to your Jeep to make it better, but please go here first. Thanks.
Tippy is offline  
post #3 of (permalink) Old 01-19-2004, 12:33 PM
Keyboard Implanted
 
lomodyj's Avatar
 
Join Date: Jan 2002
Location: Chapel Hill, NC
Posts: 3,761
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Couple of questions about my YJ

Big87YJ, Couple of things first, Please fill out your profile, atleast the basics, it's nice to know who we are talking to. Second, do a search on each item, most have been covered ad nauseum...with that said, here are my suggestions.

I put a Borla on. NO power gain as I could notice, but does give it a good sound and it will never rust...

The 4.2 is a good motor, lots of botom end but not a lot of top end, to help it simply run better, ditch the Carter BBL carb, Nutter it (do a search) and put on a Motorcraft 2100 carb. This is the cheapest reliable route. On the other end of the scale, Get the Mopar MPI (~$2300) easy to install, everything fits, and your Jeep will always start. With the MPI you will also get some power gains, but not a lot.

The 4.2 will run forever if you take care of it, but it's not gonna win alot of races...it's a draft horse not a quarter horse :-)
lomodyj is offline  
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 01-19-2004, 02:01 PM
Addict
 
barfnick's Avatar
 
Join Date: Jan 2003
Location: N.E. WI
Posts: 451
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Couple of questions about my YJ

What gears are you running? If you are pushing around 35" tires with stock gears, that is where most of your power is going. The 4.2 should be able to push 35" tires, as long as they are geared correctly. You will never beat a Neon off the line, but you should be able to drive it comfortably. I believe you should be at a minimum of 4.10's, but most will tell you 4.56.
barfnick is offline  
post #5 of (permalink) Old 01-19-2004, 03:26 PM
 
Join Date: Sep 1999
Posts: 2,006
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Couple of questions about my YJ

Yep Like was said do the profile thing let us know who and where you are and what you have.

I also have an 87

What tranny do you have? Has there been any mods made to the Jeep by the PO?

If not you more than likely have the BA/5 tranny, (sad sad, real sad) commonly refered to as the "please go". your t case may or may not be the NP207, this too is a weak x-case. The fix there is to get a NP231 to replace it. You will also have the 30/35 axle set up front and rear, although you do not have the "c" clip axle the axles will not last long pushing 35's,,, lol,, or so I have been told by various people and I see them all the time out here running happily around.

For the exhaust get rid of the stock setup and replace it with a good Midas built or Borla if you have the money 2.5" exhaust system that will give you more power than any other mod.

410 geraing will get you back to near stock power output for the motor with the 35" tires but 4;56 will put you on the top side of the power output band.

You will get to know your clutch slave cylinder/throw out bearing very well when that system breaks down, and it will.

All in all the 87 was a cross over year for the CJ/YJ getting the better YJ frame and body but keeping the better starter, non clip rearend. It also got a lot of the XJ stuff that was not so good like the NP207 and vacuum disconnect front axle.
GP'n is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups 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 email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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 On
Pingbacks are On
Refbacks are On

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