[CBinDC]

I have a 1989 Wrangler with no upgrades of any kind. What are some of the ways I can increase HP?

[mbates96]

4.0 head swap, fuel injection, motor swap

[CBinDC]

Originally Posted by mbates96

4.0 head swap, fuel injection, motor swap

Are those 3 independent things i can do to increase HP or do I have to do all 3 to gain HP? Btw, what is 4.0 head swap? Couldn't I also change my carter carb to a better carb?

[mbates96]

you can (i did to motorcraft 2100) and yes they're independent. Spend some time searching on those different topics. there's alot of things to do, but honestly it's never going to be a power house.

[CBinDC]

I'm not looking for a powerhouse, just a little extra oomph! While driving on the highway and pushing my jeep to its max at 70, isn't exactly self assuring when people are zooming around me at 75-90mph. I need a little more power to help me feel a little safer. I guess what I would really like is the ability to accelerate while I am up at those higher speeds. Will any of these help with that?

[mbates96]

i know what you mean, I'm in the same boat. I installed a MC2100 cause the carter just in bad shape and I didn't want to just rebuild. Then I did the nutter bypass to take the computer out of the loop. Make sure you don't have any vacuum leaks at the same time. Then I did a "Team Rush" upgrade and switched to a pre-smog distributor. All these things were pretty cheap except the carb (but if you search around you could do it cheaper - i just bought from the guy on ebay so it was ready to go). I've got an intake gasket leak that I'm fixing this weekend thats giving me issues at highway speed.

[CBinDC]

What kind of air filter does the MC2100 take? I've seen Weber style air filters on the 2100. Does taking ghe computer out of the loop increase emissions? Why do I have to make sure I dont have any vacuum leaks? Coincidentally, I have a vacuum right now that whistles like crazy. I'm not sure yet where it is.

[mbates96]

i think its a 9" but not 100% on that. look on ebay for the jeep motorcraft carb 2100 guy and see what all it lists. i dont know about increased emessions, but i do know the computer in its old age doesnt always do whats best for the engine. Take some carb cleaner and spray it around the engine. the engine should either rev up or stumble when you've found the area where the leak is.

[Old4X]

Do you have emission inspections where you are?

[mbates96]

visual but no sniffer - just passed about a month ago

[CBinDC]

Originally Posted by Old4X

Do you have emission inspections where you are?

I live in MD. We have really tough emissions testing. However, this Jeep is under my dad's name, who is 77 years old. Due to his age, he is not required to take it in for testing. It is officially my Jeep but we decided not to change over the title so I dont have to take it in for testing. I'm sure it wouldn't pass in its current state. When I got it from him a year ago it was in pretty rough shape.

[baritone_mike]

You could do an electric fan conversion, it is supposed to free up some ponies.

I not sure how much you would notice it with the 4.2 but with the 4 bangers it makes a lot of differeance I've heard.

http://www.jeepforum.com/forum/f12/e...rk-vii-506679/

[CBinDC]

I could just do a V8 swap to get a little extra HP!! : D

[Old4X]

The best bang for the buck is to put a 4.0 head on your block. You can still use a carburetor, so it is an easy swap. You will gain 30 to 40 HP due to the better flow design of the 4.0 head. Fuel injection can easily be added later for a few more ponies, but it is a lot of work swapping sensors, computer, etc.

You should Nutter your ignition now (this allows removal of the computer) and install a pre-smog distributor to get the most out of what you now have, and will need this also after your head swap.

[1998zj]

You do a 2.5 swap and get more horsepower than the 4.2