91 Laredo

My buddy has one on his 1998 Wrangler and its snappy when its running right. Most of the time it hesitates, runs too rich, wont hold an idle and does, etc.

He regrets the install and the money spent even though he got a deal as he got a new motor, tranny, t-case, supercharger, and all accesories for $3k. Nothing had more than 4k miles on them as the guy he bought it all from had an 02 Wrangler and went with a Chev 350 instead. (deep pockets).

The other problem is he cant find anyone to work on it to try to correct the problems.

bigbadxj

I have seen them get as much as 90 over stock kind of depends on your setup and other stuff done and the cam grind etc.. but I still would do this first before anything I like the natural aspirated stuff the only thing that I have ever used on my street/strip f-body's is nitrous that stuff is addictive. But I would buy a newer motor and build this out of the car.

kidkodiak

Wonder what that'd do to your gas mileage?

bigbadxj

Ha! good question I really don't know?

Daniel_Sach

My buddy ran like 12/17 or so. so needless to say it drops.

bamorgan7

that thing looks insane

Metmknice

It would more than likely be cheaper.

Depending on cost of materials, and what a person can do themselves as far as swap/install. It could be cheaper and a LOT more reliable. LS motors (even LQ motors- GM's truck blocks that are the same design as the LS alum blocks) can be had CHEAP and have more power STOCK, than a 4.0, or even a 4.6 stroker, with a blower. Can you say more reliable as well? Along with that you would have a beefier trans/t-case as well.

Not to sound like a jerk, but do some more research before you spout off about stuff you do not know about.

taythegibs

i know a guy that had a similar yet more expensive supercharger on his xj (dad had really deep pockets and i dont remember the brand or anything but it cost in the neighborhood of 10K for it all) and it only got him about 30-40rwhp over stock and it really sucked up the gas, he had to run a premium mix with some additive and he got 12-15 mpg until he lifted it then he got 8-10 mpg. needless to say it was not worth the $$$$. recently he was t-boned by a truck that ran a redlight and he bought back the thing from the ins company cause they gave him wery little $$ then he sold the supercharger and got more$$ than what the ins gave him. he ended up loosing about 6k on the thing.

Daniel_Sach

Well you do sounds like a jerk bud. A v-block is not going to be as reliable as a I block. Yes the V-block may have more power over all. No duh. A good V-8 is not going to be cheap. Sure if you scrounge all the parts together and build a POS using cheap parts maybe. I would bet my left nut it would last half the time a I-6 would. The I-6 is by far the most reliable engine make within reason. Look around and you will see. there are a lot more I-6 engines tan you realize. A v-8 swap would cost at least 5 K to do it right with quality parts. I do know what I'm talking about. "spout spout spout"

Daniel_Sach

And from past experience. That super charger makes more than enough power for an XJ. You would be a fool to waste the money to swap a V-8 into an XJ. Maybe....Maybe if it had a blown engine.

BuckB91XJ

So, do one of you guys want to tell me how a blown 4.0 or an LS V-8 is going to be an improvement over my stock 4.0 HO motor that gets me back and forth to work, dependably, every day at 19 MPG and has gotten me through every trail I've pointed my XJ at just fine.......all I can see from either motor is that it would make my XJ an awesome quarter mile car and cop car magnet. Not to mention it would suck gas and most likely be constantly overheating on me. Just an outside opinion and a little sanity check guys.

Daniel_Sach

My point exactly. You don't need that much power. A blown 4.0 would be great for baja racing and all but for a DD and off roading the stock and a few bolts on's are just fine. Though having 55% increase in torque is cool. lol
Thank you for the sanity check.

bigbadxj

That is what I was trying to say! If I did everything else in the world to mine then I would do a stroker kit it would still be the same car just with alittle more power and it may get less gas mileage but if I was really worried about that I would get a Honda. As for the V-8 thing I have two LS longblocks in the garage (LS1 & LS6) which will be swaped in to cars that never came with one and I have not once thought of putting one in a Cherokee just doesn't fell right to me.but it has been done

solderjunkie

That looks really good. It's rare to see a pro-install... usually V-8 swaps are butchered (and look it).

evans

I am all for swapping a V8 over a stroker motor. I have an LS1 car that has a larger than average cam (234/242 588/596 112lsa) plus all of the bolt ons and I still get 25 mpg highway 18 in town (staying away from WOT) at 400+rwp through a 6 speed. I have seen friends with 100,000+miles on their LS as well as Ford 5.0 cars spraying the crap out of them on the street/track and still DD these cars with no problems.
I have had several Jeeps and all but one had a 4.0. I am fond of these motors don't get me wrong but there is a reason every company under the sun isn't making power adders for them. It is simply polishing a turd. By the time a person builds a stroker or F/I motor right the computer would need a very deatiled tune to make it run correctly. This means a tuner needs to sit down and watch how the Jeep is running (air/fuel ratio) in real time and adjust accordingly. There is no programming that can change the Jeep's tune in that much detail. Keep in mind mail order tunes are generic tunes that have blown many motors and hand helds are not that detailed.
Also with anyone running boost that truely wants a reliable engine the bottom end should be forged and not stock components. Forced induction is alot harder on internals and a F/I gasoline engine will not live the same lifespan of a N/A engine. Using forged internals will help take the added pressure of boost and add to the life span as well.
To build a stroker engine is not that bad of a route to go, I just worry about over heating problems. These motors run at a pretty high temp anyway. I know if my GTO would hit 210 I'd crap my pants but that's the average for a 4.0. I wouldn't want the cylinder walls cut by any more than .030 and go with the 4.6 stroker any more than that has to be prone to overheating, crack and warping the walls.
I have an extra 4.0 and thought about a boosted 4.6 but after looking at the cost to do it right and the lack of tuning support ( not to mention water in a super charger = BOOM )I am building a mild fuel injected Ford 302 for my Jeep. I haven't decided if I will use a novak adapter and stick with my tranny or if I will go with another transmission all together. Still doing some homework on that part.

BTW where did you find the LS1 XJ pics??????