Higher horses, higher revs & even higher torque, a streetable LJ engine swap

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    Higher horses, higher revs & even higher torque, a streetable LJ engine swap

    "Never let someone tell you that you don’t need more horsepower. Just stop talking to them, who needs that kind of negativity in their life?"

    If you missed the main phase of my build, you can find it over here: High travel, high clearance & high octane, a streetable adventure LJ story. I'm still posting non-engine related build updates over there so if you're interested in that type of thing too I suggest you follow both threads!

    Ever since I rode along in some Jeeps desert racing and put the supercharger on my Jeep I've turned into a bit of a horsepower junkie. Because ending an addiction is no fun, my methodology here is to throw the biggest, baddest, strongest engine (that doesn't compromise my main build goals) under the hood of my LJ and not be left with wanting anything more.

    Unlike the main phase of my build which I received a lot of direction on from MrBlaine and was able to base my build on many many iterations done before mine, this engine phase of my build I'm going to be upfront that I have little to no clue what I'm doing. Don't tell anyone but the most engine speak I do is smiling and nodding when guys talk about their engine's lift, timing, compression, litres, etc -- yeah, I have little to no clue what any of that means. HP/TQ charts are about as far as I understand. I'm sure as I do this engine swap that there will be things that work well, things that could be done better but aren't worth redoing, and things that need redoing. This is new territory for me.

    My goals are:
    • Reliability is priority.
    • Not compromising phase 1 of my build is non-negotiable.
    • Cramming as many ponies under the hood as I can.
    • Torque and HP curves need to work well for my uses and not focus solely on peak horsepower.

    #2
    Here's an overview of the Jeep this engine will be going into. (Full details on my build thread: https://wranglertjforum.com/threads/...lj-story.9956/)
    • 37" MTR tires on 17" TrailReady beadlocks.
    • RockJock 60VXR axles geared to 5.38 front and rear with ARB lockers, RCV front shafts, load bolts, and full floating rear.
    • 14" Fox coilovers front and rear with 7" up and 7" down at an equivalent lift height of 4"
    • 105" wheelbase which is ideal for my tire size
    • Savvy mid-arm 3/4 link.
    • Tucked skids
    • All aluminum armor and synthetic winchline to keep weight to a minimum
    • 4860lbs fully loaded.


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      #3
      I followed your build on the other site. That Jeep is cleeeean, and you definitely gots the OCD.

      I'm looking forward to seeing the next phase!

      Comment


        #4
        Originally posted by SLOWPOKE693 View Post
        I followed your build on the other site. That Jeep is cleeeean, and you definitely gots the OCD.

        I'm looking forward to seeing the next phase!
        I'm glad to have you following!

        She's not quite as clean as it looks though. Some day the torque boxes are going to rust through. :'(
        Last edited by toximus; 06-04-2020, 07:36 PM.

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          #5
          Are you going to stay with an LS engine?

          If so, just throw a LSX454 in there. It's a factory crate engine so the reliability is there and it makes stupid power.
          Kevin

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            #6
            Thanks for starting this. I followed the other one and was hoping you would pop up over here. I dig your attention to detail. Ill be looking forward to the Engine progression!

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              #7
              Originally posted by gt1guy View Post
              Are you going to stay with an LS engine?

              If so, just throw a LSX454 in there. It's a factory crate engine so the reliability is there and it makes stupid power.
              I'm currently running the stock 4.0L with a supercharger. The supercharger hasn't worked right since day 1 and despite months of talking to the company that sells them (BoostedTech has been unbelievably unhelpful) I've gotten nowhere as far as solving the problem.

              I haven't bought a motor to swap in yet, but I'm leaning strongly toward the LS.

              Since I'm not wanting to work on the motor aside from easy stuff like bolting on accessory brackets, do you know how much work a LSX454 takes to finish off?

              Comment


                #8
                Originally posted by backchat View Post
                Thanks for starting this. I followed the other one and was hoping you would pop up over here. I dig your attention to detail. Ill be looking forward to the Engine progression!

                I thought about copying my other thread over here but it seemed like it'd just be confusing. Instead, I linked to that build thread on a different forum instead of *irate.

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                  #9
                  Great! Are you updating the other thread on that board?

                  Thanks again.

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                    #10
                    Originally posted by backchat View Post
                    Great! Are you updating the other thread on that board?

                    Thanks again.
                    Yeah, I'll still be posting non-engine build updates to WranglerTJForum, JeepForum, and Pirate.

                    Comment


                      #11
                      Perfect, keep it up, we appreciate it!

                      Comment


                        #12
                        Originally posted by toximus View Post

                        I'm currently running the stock 4.0L with a supercharger. The supercharger hasn't worked right since day 1 and despite months of talking to the company that sells them (BoostedTech has been unbelievably unhelpful) I've gotten nowhere as far as solving the problem.

                        I haven't bought a motor to swap in yet, but I'm leaning strongly toward the LS.

                        Since I'm not wanting to work on the motor aside from easy stuff like bolting on accessory brackets, do you know how much work a LSX454 takes to finish off?

                        My mistake, I remember seeing posts about your blower and just assumed you had an LS.

                        The work it takes to finish off the LSX454 would be the same as any GenIV LS engine. I'd think you could just run it standalone in a TJ, but I'm sure there are others here that are more switched on about TJ swaps. I know Dookey may have some insight. Maybe a call to PSI Conversion (732-444-3277).

                        I'd run a 6l80/90 trans with it. You're already running a auto trans correct?

                        Need to make sure the rest of your drive train is up to the task of 627hp and 586 ft/lbs. That's a lot of torque. GM also makes crate LS3 engines in 525hp, 480hp and 430hp, along with all the other stock replacement engines for cars and trucks.
                        Kevin

                        Comment


                          #13
                          Maybe a little too far off base if you are dead set on an LS, but there was some good tech recently posted on here for a Hemi swap into an LJ...

                          https://irate4x4.com/forum/brand-spe...emi-powered-lj

                          Comment


                            #14
                            Originally posted by gt1guy View Post


                            My mistake, I remember seeing posts about your blower and just assumed you had an LS.

                            The work it takes to finish off the LSX454 would be the same as any GenIV LS engine. I'd think you could just run it standalone in a TJ, but I'm sure there are others here that are more switched on about TJ swaps. I know Dookey may have some insight. Maybe a call to PSI Conversion (732-444-3277).
                            I am thinking a NA engine might be a better choice for me after my negative supercharger experience which was impossible to diagnose the issue of without throwing parts at it. I'm also not sure that an intercooler will stack behind the grill along with my large steering and transmission coolers, engine radiator, and AC condenser. If the typical radiator space behind the grill is an issue I could also place a cooler with a fan blowing up through a hood vent on top of the engine.

                            Originally posted by gt1guy View Post
                            I'd run a 6l80/90 trans with it. You're already running a auto trans correct?
                            I am currently running the stock automatic and I plan to stick with an automatic. The 6 speed would be awesome for having a nice range of gears in low range. I don't want to loose any belly height and the 6L80 is deeper than the 4L70 so I need to make sure that'll be fine before spending money.

                            Tap shift could be fun but not a requirement, and I don't need a manual valve body.

                            Originally posted by gt1guy View Post
                            Need to make sure the rest of your drive train is up to the task of 627hp and 586 ft/lbs. That's a lot of torque. GM also makes crate LS3 engines in 525hp, 480hp and 430hp, along with all the other stock replacement engines for cars and trucks.
                            My axles should be fine and I will be replacing the transfercase too so I think it'll all hold up.

                            Originally posted by gt1guy View Post
                            GM also makes crate LS3 engines in 525hp, 480hp and 430hp, along with all the other stock replacement engines for cars and trucks.
                            The crate LS3 seems to be a very easy engine for me to wrap my head around and there's a ton of knowledge of it on the LS forums if I ever do have issues. I'm sure there's plenty of reputable engine builders across the country that I could also go to that could help me with any LS3 issues too. And, at least on the surface, it seems to fulfill my requirements. I did notice a few companies are stroking the LS3 to make 600-700hp NA for Ultra4 but I don't know how those will hold up after 20 years and 200k miles. I also don't want to be tied to a single company to support a stroked LS3 when I inevitably will have an issue.

                            I could totally be off base here, this is just my ramblings...
                            Last edited by toximus; 06-05-2020, 02:19 PM.

                            Comment


                              #15
                              The LSX454 and the three LS3 crate engines I mentioned are all NA.

                              I honestly don't know about the warranty on the LSX, but the LS3/525 I put in my Jeep came with a 2yr/24k mile warranty. There are literally thousands of folks DDing LS crate engines. I'm sure it's the same for the Ford and other crate engines.

                              As far as stroker engines go..................you ain't getting much bigger than 454ci.


                              Kevin

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