October 4, 2007i have an 03 tj with 4.0. It seems weak to me. is here any thing i can do to help without spending a fortune
October 4, 2007How much is a fortune? Performance can start with exhaust, a chip, better gears, intake/throttle body. All of these will set you back some money. Check ebay for deals on good used stuff.
October 4, 2007ill let you drive mine with the 4.2 so you know just how good you have it, haha
October 4, 2007To really answer that you need to look at tire size and gear ratio. Keep in mind as well, it's a Jeep and not a race car. They are generally built for torque and not horse power. It's a box with a 6 cylinder!
November 4, 2007i noticed a difference when i bypassed my a/c, added a k&n and installed a throttle body spacer. gears will give you the most noticable "power" difference, it helps you use the power you have more effectively.
November 6, 2007you can do the same thing i am going to do this summer. do a amc 360 v8 swap. haha thats not very cheap just to let you know. but with mine i did headers and a custom made cold air intake. the a/c is eliminated and did a glasspack muffler with aturn down after that and with all that really improved the hp. it is the second fastest vehicle in school. the 1st is a 87 chevy short bed with a built 454. i will beat him soon. haha hopefully
November 7, 2007Actually a stock 4.0L has more HP than a stock AMC 360. I think the 360 in my 86 was rated at 145 hp when it was brand spanking new! If I remember right the 4.0 in my 00 Wrangler had 190hp. Not saying you can't get more power out of them, but right out of the box they're pretty weak, as most engines from the 80's where. You can get upwards of 300 hp out of a 360 but you can do the same to a 4.0.
November 7, 2007i agree with the crappy 360 power. thats why im am boring mine .030 over. and intake adn carb. i heard a trick of som kind where you reposition the crankk posisioning sensor and increases hp? am i correct i cant remember
November 7, 2007There's no crank position sensor on a 360, no computer controls at all.
BTW I would NEVER bore an engine out unless it needs it to bring the cylinders into tolerance, even then I'd only bore it as far as it needs to. Boring doesn't really add power, it slightly increases displacement but that's about it. The farther you bore out an engine the thinner the cylinder walls become, and will become more prone to things like warping and hot spots. It's also that many less times the block can be rebuilt and AMC blocks aren't as easy to come by as Chevy blocks are.
The best way to get more power out of a 360 is a Cam and Intake. Also an HEI distributor or TFI conversion will give you alittle power but greatly improve drivability. You can also bump up the compression to get more power out of it, but be prepared to run a higher octane gas or convert to fuel injection.
I plan on converting my 360 to GM TBI electronic fuel injection this winter. When I get to rebuilding the engine a Cam and Intake along with upping the compression to around 9-9.5/1 will be on my list. There are other ways to pull power out of the 360 but unless your building a dragster those are some of the more economical ways to liven things up abit. BTW from everything I hear headers are pretty much a wast on the 360 since the original manifolds flow so well, plus on a Jeep you WILL have interference problems with the front axle/ drive shaft. I had that problem when I had a new exhaust put on my 90 Wag. The Y-pipe has to basically hug the engine to stay out of the way of the suspension.
November 7, 2007i was talking about the 4.0 motor with the crank position sensors. i forgot to mention that.
November 9, 2007I have an 02 Wrangler and the power is horrible in mine because I still have stock gears but have done a 6 inch long arm lift and threw 35 inch tiers on it. I tried adding a snorkle, header, banks exhaust and a converter but it still sucks. Now I am adding gears and I am hoping after that it will be taken care of. I don't want a race car but I would like to do 65 mph on the highway and acutally use all 5 of my gears!