Mazda787b wrote: Are you set on diesel? If you want to put something fresh in there, why not a Stroked 4.0? INB4 2jz suggestions.

I'm not set on diesel. Honestly if i could get an LSx in the thing for what i'd consider a reasonable price and feel good about it, i'd probably do it.

Already thought of the 2jz. I even have an R154 bellhousing. And it's been done.

Realistically and logically speaking, the 3 "top" choices are in no particular order:

1) Stroked 4.0
2) Buy new longblock from a local place for $1400, spend a little extra for a Mopar cam, nice headers and just basically "warm it over" a bit. Should be set to go for the rest of our lives at that point.
3) Supercharge the 4.0. Seems there's a couple kits out there and while they don't make GREAT power, nor are they designed the way i'd like, they do seem to work, and do yield fairly substantial gains.

Concerns with #1: Mostly trying to keep whatever i do running on factory electronics. I have 3 cars running on standalone ECUs. I'm not real interested in adding a 4th. But, i bet with just some fueling tweaks, it could run just fine.

2: Probably won't do MUCH for the MPG aspect.

3: Also probably won't do anything for the MPG aspect, and the "tuning" solutions off the shelf usually suck. (Though... i found one that has a diablotuner option and comes with 400cc injectors, so it can't be awful)

If you can get a hold of Kenvin@Syked ECU, he is working on cracking (or has already cracked) most of the modern Mopar PCMs. He can re-configure Diablos to flash other platforms as well. Best bet is probably to get a hold of him through Facebook. He has been able to flash a Stratus R/T turbo cal onto a Neon PCM, for example.

There was another guy on the Jeepstroker forum doing flashes as well.

I've heard you can turbocharge the 4.0

miatame wrote: I've heard you can turbocharge the 4.0

Yeahhh... but... that's something i'd rather not do. Honestly, that's the biggest "ding" against the supercharging idea as well. It's just one more thing to go wrong.

And i have three turbo cars.

This is a truck, i'm not looking for barnstorming performance, just a little something to make it a better truck.

If you look up Josh Pariseau from Burlington VT he had a '93 XJ with a 383 stroker, Dana 44 front with leaf springs and an 8.8 out back. He competed in Top Truck Challenge. I thought about buying it years ago. I think I'd still rather go with MB Diesel myself.

Edit: I'd do a 4.0 with a 4.2 crank and keep it simple if I was just looking to make a better truck. Then swap in a rear Dana 44 from a Wagoneer edition XJ, it's a nice bolt in upgrade!

This caught my eye earlier:

www.prindlemfg.com/project_detail.php?projectID=2

Are those good motors?

I don't know...I tried looking for OM651 swaps, but that showed up. The engine might be worth looking into though.

I rode in a buddies 4.6 or 4.7 stroker. Color me unimpressed. Probably more down low power for rock crawling goodness, but nothing more useable on the road than the 4.0 had.

I would vote option #2, or rebuild yourself on the cheap.... how many project cars do you need? One more than you currently have?

ProDarwin wrote: I rode in a buddies 4.6 or 4.7 stroker. Color me unimpressed. Probably more down low power for rock crawling goodness, but nothing more useable on the road than the 4.0 had. I would vote option #2, or rebuild yourself on the cheap.... how many project cars do you need? One more than you currently have?

I mean... at the least, i'm going to have the head re-done no matter what, and the manifold needs to be replaced anyways. The pushrods were definitely not adjusted as they should be anymore last time i did the valve cover gasket.

Project or not, it needs attention.

Did your buddy's stroker have any sort of tuning done? Or was it just on stock ECU?

Low end power is what i need. Especially now with the lift and the 30s, trying to accelerate once this thing has dropped into overdrive (about 45mph normal driving) is completely awful and doesn't really happen. And you really have to floor it to get it to drop down a gear. An increase in power from 1200-2000rpms would be very welcome.

Well, it was in an originally carbeurated 4.2 wrangler (Improvement over the 4.2 was great, over the 4.0, no). It had the stock 4.0 ECU I believe.

I found this:

Diesel swap guide

Maybe re-gear?

I'd guess you've probably got 3.55 maybe 3.73 gears. A set of 4.10s would probably bring it back to life.

You should try to accelerate my 2.5l, auto, 3.73 gears, 32" tires. After a few miles in mine your XJ will feel like a rocket ship.

• Lee

Swank Force One wrote: Ooof. The LSx swap is pretty salty, and seems i'd have to stick with the LS motors, can't use an LQ in the XJ without some hood modifications that i'm not real interested in. Which kindof sucks, because an LQ9 looks like it could be fun. The other downside is that the swap looks like it needs about $4k in parts from Novak, and i'm not even sure i got it all. And that's not including a donor car/drivetrain yet. Ouch. Looks like this probably isn't the greatest idea. Which sucks, because i could really use more power after going to the 30" tires, and probably moving to 31s next year.

Wat.

You probably just need the car intake. Not very hard.

Swank Force One wrote: Looks like this probably isn't the greatest idea. Which sucks, because i could really use more power after going to the 30" tires, and probably moving to 31s next year.

Odd, my old '90 XJ with the crappy Renix engine management could get the BFG A/T 31s on it to spin occasionally. That truck was fairly quick (5MT) and never felt like I "needed more power."

I did feel like I needed better engine management since it occasionally decided to idle at 2k, 3k, 4k, or 5k, or 500rpms depending on which stoplight I stopped at on any given day, lol....

In reply to bigdaddylee82:

My 1991 XJ had a D35 rear end with 3.55s. I wanted to swap in a Chrysler 8.25 rear with 4.10s. According to the internetz, those were found in the 4 cylinder XJs. And they are cheap. Like $250 cheap. You might need to grab the driveshaft off of the XJ with the 8.25 as that axle has a longer pinion.

Mine was only 2wd so it was kinda pointless LOL

In reply to irish44j:

If he's got an AW4 it's a whole different animal, it is a power sink, HP goes in and stays. Novak says it best.

Novak said: The AW4 is a light to medium-duty transmission. Ours, our callers' and customers' experiences with the AW4 are less than stellar. They have a tendency to generate excessive amounts of heat, and are known for unnecessarily consuming more engine power than some other automatics. The shift points in the AW4 feel odd, and the spotty engagement of the lockup torque converter is idiosyncratic.

Manual swap, would be a huge improvement. Bang for buck will be lower geared diffs.

• Lee

In reply to irish44j:

Oh it'll do a decent burnout from a stop, but it peters out pretty quickly and the whole early overdrive thing sucks. This is a late 4.0 which makes the most hp and torque, but it does it up top, which isnt helping me when i'm trying to accelerate from 55mph in overdrive at 1500 rpms.

stanger_missle wrote: In reply to bigdaddylee82: My 1991 XJ had a D35 rear end with 3.55s. I wanted to swap in a Chrysler 8.25 rear with 4.10s. According to the internetz, those were found in the 4 cylinder XJs. And they are cheap. Like $250 cheap. You might need to grab the driveshaft off of the XJ with the 8.25 as that axle has a longer pinion. Mine was only 2wd so it was kinda pointless LOL

My XJ has the Chryco 8.25, don't know what gear.

In reply to bigdaddylee82:

Manual swap not in the cards under any situation unfortunately.

Could use a rear gear but i'd like to not lose more mpg. Best tank i'be gotten since the lift and tires was 16.5, figure 17.5ish after accounting for diameter difference. Wife usually gets 13-14 out of it 100% city.

Swank Force One wrote: In reply to irish44j: Oh it'll do a decent burnout from a stop, but it peters out pretty quickly and the whole early overdrive thing sucks. This is a late 4.0 which makes the most hp and torque, but it does it up top, which isnt helping me when i'm trying to accelerate from 55mph in overdrive at 1500 rpms.

Says almost everybody about their car/truck. What vehicle has an abundance of power at 1500 rpm in OD with a good amount of air resistance at 55 mph?

Click it out of OD and press on the go pedal more.

A 4.7 stroker with some head work will really wake it up and actually improve mpg if you do it right. You won't have to worry about ecu or wiring harnesses or trans adapters. Its worth it.

miatame wrote:

Swank Force One wrote: In reply to irish44j: Oh it'll do a decent burnout from a stop, but it peters out pretty quickly and the whole early overdrive thing sucks. This is a late 4.0 which makes the most hp and torque, but it does it up top, which isnt helping me when i'm trying to accelerate from 55mph in overdrive at 1500 rpms.

Says almost everybody about their car/truck. What vehicle has an abundance of power at 1500 rpm in OD with a good amount of air resistance at 55 mph? Click it out of OD and press on the go pedal more. A 4.7 stroker with some head work will really wake it up and actually improve mpg if you do it right. You won't have to worry about ecu or wiring harnesses or trans adapters. Its worth it.

That's the thing... there's no "clicking" it out of OD. It's a downshift on the gear selector into 3rd, and the gap between 3rd and OD is GIGANTIC.

It was ok before the slightly bigger tires and lift, but now it's pretty bad. I'm just looking for maybe another 20-30ftlbs down low so i can keep up with traffic without having to downshift like a madman and look like a moron. (Truck is pretty loud, full Magnaflow exhaust that i rather hate)