If it's a '95 4.0 then it's a H.O. No other option except 2.5 4cyl.

 

Man this thread..

 

Yah know, Ive got to say I DO like the earlier 4.0s better than the later. I mean Ive got a Beautiful 2001 SilverStone Metallic with a little over 64,??? miles, and yes that Jeep Gits Up and Goes, and has taken a bit of Abuse, but then I drive my Haggard looking Desert Fade Black 87 the First year 4.0 with 291,??? miles shes spun along, and Ive got addmiration and respect for that old motor. My 99 is under rebuild right now, as Cylinder #2 wrist pin made a egg shape hole in the piston vs. a Round one. That Jeep had 132,??? miles on her odometer when that happened. My 96 has 248,??? miles and runs like a champ. Ive Had two 88s and one 89 that just seemed to have a Gruntier torque than the later year 4.0s, regardless of manual or auto tranns. I do believe the earlier 4.0s were more durable, and reading of the Higher nickle content of earlier 4.0s conferms that.

 

:-):-):-)

 

Oooooh, back in LOVE with the Best year, the Last year, 2001!!!

 

To me, a 4.0 straight 6 is a 4.0 straight 6.

 

I've been thinking about doing an intake manifold swap. I have a set of 6 Neon Injectors that I've cleaned, flowed, and clicked, but haven't gotten around to installing them yet.

I'm getting a snorkel so I'll have a true cold air intake, and I also want a bored throttle body.

Basically all of those components, along with a heat shield between the exhaust and intake manifolds and heat wrap on them will make plenty of power!

 

Any details on this heat shield you're going to install? I've always felt like isolating the intake manifold from the heat of the exhaust might be a good thing.

I have an aftermarket header waiting to go on, going to look into having it ceramic coated first. I've heard the exhaust wraps can expedite rust by trapping moisture and sometimes even cause headers to crack because of holding too much heat in... then again it gets used on race engines fairly often so I guess it just depends on the durability of what you're using it on.

 

I'm putting the Neon 703s in this weekend - will be going back to the JY for a few things and will look for a 99 manifold.

Do you have to mod the exhaust to hook it all up?

 

Basically my rough design will just be a peice of sheet aluminum that will have holes drilled to mount on the stock exhaust mainifold bolts.

I'd look into ceramic coating too. Not only does it look good, its very functional. The heat wrap can trap moisture, but if you spray the exhaust manifold down with flame proof paint, it should be fine.

 

I made one for my Datsun 3.0 stroker inline 6 using 2 pieces of aluminum sandwiched together with a 3/8" space between the sheets. Worked kinda like a dual pane window only much cruder.

 

Did the injector swap on my 94 country, I wouldn't even bother with it. The OBDII computers will automatically adjust fuel flow to be around the same as stock injector output with the new four port injectors. You'll get better spray of course, since you're going from single to four port injection, but as far as power and huge increases like some get from different engines/computers/models, I sure didn't on the OBDII system, a lot of guys have had the same experience as I have.

 

holy information batman!!

 

Obd2 can be adjusted with a tune... think they're piggy back but can't remember... just one reason I love my renix.

 

i have had both a RENIX 88 XJ and a OBD1 94 XJ, and i loved them both. i like the reliability of the later electrical system, it seems to get better gas mileage and power with the same mods as well. but if you know how to use a volt meter, and have a little patience, then the RENIX motor is the one for you. you can fix anything with a voltmeter on the 87-90 motors!