LJ78 2LTE to ?________? Engine Swap (1 Viewer)

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Jan 28, 2019
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botswana
One important question: Is your LJ78 manual or automatic? If automatic, you have to consider what to do about the electronic control of the transmission when you swap to a different engine.

Here is how I see it:

1KZTE - Fairly easy upgrade, as this engine came in the later KZJ78 anyhow. The 1KZTE ECU can control Prado transmission. Still risk of head problems.

1KZT - very desirable because of the mechanical injection system, but would require some creativity to keep the auto transmission working properly. However it would be perfect with a manual transmission. Still risk head problems.

3L - Again, will require creativity to run the auto trans. Less power than what you have. If you turbo it to regain power, you can still run into the same head problems you already face with the 2TLE. And in fact, the 2LTE is better built for boost with stronger pistons and a lower compression ratio. So really there is no point IMHO.

1KD-FTV - Will be very expensive to obtain. Is a newer electronic engine, so you will need to consider there will be wiring challenges. Will be a pretty unique swap, so you will be breaking trail on it. Hard to get parts for. Also, has a CRD injection system which I've heard can be failure prone and expensive to repair.

If my 2LTE blew up tomorrow, I think hands down I would install a Lexus 1UZ-FE 4.0l V8 engine. This swap is well proven into Prados. It's almost like the engine belongs in there. Fuel economy will be the same as the 2LTE, but it makes three times as much power. It is one of the most over engineered long lasting engines Toyota has ever made. It can be obtained for less than $1500 by simply purchasing a running Lexus LS400.

One of your easiest and most affordable options is to fix your turbo, sell your Prado, and buy a more suitable land cruiser. If you wanted to stick with a PRado, you could buy this one that already has a 3B-turbo in it: Kijiji - Buy, Sell & Save with Canada's #1 Local Classifieds Or you could look at other cruisers like the HDJ81, HJ61 etc.

Incidentally, I am upgrading to a Mitsubishi TD04L-13T turbo and will be selling my OEM turbo. My OEM turbo is in great shape and was rebuilt about 20,000kms ago. I'll be selling my OEM turbo soonish, so if you interested, let me know.

Here is what a Lexus V8 looks like in a PRado:
lj703-jpg.948327

lj702-jpg.948328
One important question: Is your LJ78 manual or automatic? If automatic, you have to consider what to do about the electronic control of the transmission when you swap to a different engine.

Here is how I see it:

1KZTE - Fairly easy upgrade, as this engine came in the later KZJ78 anyhow. The 1KZTE ECU can control Prado transmission. Still risk of head problems.

1KZT - very desirable because of the mechanical injection system, but would require some creativity to keep the auto transmission working properly. However it would be perfect with a manual transmission. Still risk head problems.

3L - Again, will require creativity to run the auto trans. Less power than what you have. If you turbo it to regain power, you can still run into the same head problems you already face with the 2TLE. And in fact, the 2LTE is better built for boost with stronger pistons and a lower compression ratio. So really there is no point IMHO.

1KD-FTV - Will be very expensive to obtain. Is a newer electronic engine, so you will need to consider there will be wiring challenges. Will be a pretty unique swap, so you will be breaking trail on it. Hard to get parts for. Also, has a CRD injection system which I've heard can be failure prone and expensive to repair.

If my 2LTE blew up tomorrow, I think hands down I would install a Lexus 1UZ-FE 4.0l V8 engine. This swap is well proven into Prados. It's almost like the engine belongs in there. Fuel economy will be the same as the 2LTE, but it makes three times as much power. It is one of the most over engineered long lasting engines Toyota has ever made. It can be obtained for less than $1500 by simply purchasing a running Lexus LS400.

One of your easiest and most affordable options is to fix your turbo, sell your Prado, and buy a more suitable land cruiser. If you wanted to stick with a PRado, you could buy this one that already has a 3B-turbo in it: Kijiji - Buy, Sell & Save with Canada's #1 Local Classifieds Or you could look at other cruisers like the HDJ81, HJ61 etc.

Incidentally, I am upgrading to a Mitsubishi TD04L-13T turbo and will be selling my OEM turbo. My OEM turbo is in great shape and was rebuilt about 20,000kms ago. I'll be selling my OEM turbo soonish, so if you interested, let me know.

Here is what a Lexus V8 looks like in a PRado:
lj703-jpg.948327

lj702-jpg.948328
Greetings I am the first time user,I wish to know what are the modifications you will need to do with lexus LS400 1UZ-FE INTO THE LJ78 PRADO with regard to the gear box??Does it fit to gear assembly?do you need to change the radiators??what general modifications are there?
I wish to buy a new engine also for my Prado LJ78 as it has blown the turbo and the engine broke the timing belt.
 
Joined
Sep 21, 2020
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penrith
Sorry I wrote this in a rush.
The ECU works with the 1KZTE. The 1KZT doesn't need the ECU as far as I've read.
And I can no longer find the link for the 1KZT but I remember finding it for around that price.

Im currently helping a mate of mine with a swap from the 2lte in his lj78 to a 1kzte, is this reply here suggesting we can use the lj78 cab/engine harness and ecu with the 1kzte engine? is there any differences between the 2lte and 1kzte ecus in terms of how they control the engine?
 

GTSSportCoupe

2LTE abuser
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Victoria, BC, Canada
Im currently helping a mate of mine with a swap from the 2lte in his lj78 to a 1kzte, is this reply here suggesting we can use the lj78 cab/engine harness and ecu with the 1kzte engine? is there any differences between the 2lte and 1kzte ecus in terms of how they control the engine?

The ECU's of the 2LTE and early 1KZTE control the engines in much the same manner. But the 1KZTE has more displacement, and a 12mm (vs 2LTE 10mm) injection pump. This means it injects a lot more fuel for the same Spill Valve duty cycle. Thus the 2LTE ECU on the 1KZTE would probably run the engine way too rich; like very high idle, smoke, check engine light etc. If you want a nice running vehicle, use the 1KZTE ECU and harness with the 1KZTE engine.

What may work would be the 2LTE ECU, and 2LTE injection pump on the 1KZTE. It would probably idle ok with some adjustment to the spill valve. But it will run leaner with much less power than it should.
 
Joined
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Victoria BC
Question about the UZ-FE swap, is it just the 1UZ that works or do the later 2 and 3 versions also fit as well? Looking at buying something with the compatible engine to do the LJ78 swap down the line
 

GTSSportCoupe

2LTE abuser
Joined
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Victoria, BC, Canada
Question about the UZ-FE swap, is it just the 1UZ that works or do the later 2 and 3 versions also fit as well? Looking at buying something with the compatible engine to do the LJ78 swap down the line
They all fit, but the newer they are, the more challenging the electrical will be. Reading through this post again, I see I used to be pretty pumped about the 1uz. Having talked to people now who have swapped to 1uzs, I don't think I'd go that route any longer. I'd keep it diesel. 15bft with an h55 would be awesome. Or any direct injection b series diesel.
 
Joined
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Whitefish/Bozeman, MT
Question about the UZ-FE swap, is it just the 1UZ that works or do the later 2 and 3 versions also fit as well? Looking at buying something with the compatible engine to do the LJ78 swap down the line
I haven’t seen a 2UZ swap yet, but there is an outfit in New Zealand that has put a 3UZ in one: Looks pretty awesome, but the wiring would be the challenging part for sure.
 
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Victoria BC
They all fit, but the newer they are, the more challenging the electrical will be. Reading through this post again, I see I used to be pretty pumped about the 1uz. Having talked to people now who have swapped to 1uzs, I don't think I'd go that route any longer. I'd keep it diesel. 15bft with an h55 would be awesome. Or any direct injection b series diesel.
Are there downsides to the 1uz, or is that just because of the fuel price difference?
 

GTSSportCoupe

2LTE abuser
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Are there downsides to the 1uz, or is that just because of the fuel price difference?

Although the 1UZ is pretty economical in the LS400, it does apparently drink substantially once in a landcruiser (especially lifted with big tires). I've also heard that cooling problems can persist even when the 2LTE is swapped out. The LJ78 radiator is tucked in a small space and there is only so much that can be done to upgrade it. So for me with towing, I'm sure I'd be getting the 1UZ good and hot. Although 1UZ's are cheap to get, that is just the beginning of the cost. There are A343f mods to be done, custom exhaust, mounts, electrical, etc. etc. Doing the job mostly yourself I'm sure it'll add up to $5k+ by the time your happy. Many say $10k is the number.

If a 2LTE is running fine, I really think there is no reason to swap it out. They're economical. Unless towing, they can be cooled fine. They're easy to tune up for about 140hp and 250ft/lb once intercooled, which is decent enough power. That power doesn't seem like much, but I can cruise up an 8% grade in overdrive with my 35s at 90km/h, 100+ with my 32s. Parts are easy to get and cheap relative to newer diesels. They're easy to work on. $2000 into upgrades will have a great running motor. Much cheaper than a swap.

Now if a 2LTE was totally toast with bottom end issues etc, then I'd look into swaps. B series, 1KZT, 1KDFTV, etc. Or on gasser end early 1UZ, 5VZ, etc.

Swaps are not easy either. Were you planning to try this yourself or pay someone?
 
Joined
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Victoria BC
Although the 1UZ is pretty economical in the LS400, it does apparently drink substantially once in a landcruiser (especially lifted with big tires). I've also heard that cooling problems can persist even when the 2LTE is swapped out. The LJ78 radiator is tucked in a small space and there is only so much that can be done to upgrade it. So for me with towing, I'm sure I'd be getting the 1UZ good and hot. Although 1UZ's are cheap to get, that is just the beginning of the cost. There are A343f mods to be done, custom exhaust, mounts, electrical, etc. etc. Doing the job mostly yourself I'm sure it'll add up to $5k+ by the time your happy. Many say $10k is the number.

If a 2LTE is running fine, I really think there is no reason to swap it out. They're economical. Unless towing, they can be cooled fine. They're easy to tune up for about 140hp and 250ft/lb once intercooled, which is decent enough power. That power doesn't seem like much, but I can cruise up an 8% grade in overdrive with my 35s at 90km/h, 100+ with my 32s. Parts are easy to get and cheap relative to newer diesels. They're easy to work on. $2000 into upgrades will have a great running motor. Much cheaper than a swap.

Now if a 2LTE was totally toast with bottom end issues etc, then I'd look into swaps. B series, 1KZT, 1KDFTV, etc. Or on gasser end early 1UZ, 5VZ, etc.

Swaps are not easy either. Were you planning to try this yourself or pay someone?
I'm hoping to try it myself. I've got enough family that have done engine swaps before I should be able to get most of it done for just parts and beer.

Right now I'm just preparing for the worst case scenario. I'm at 210k and a quarter of that was with pretty well no cooling system. Wrong rad cap, wrong thermostat, and a radiator that hadn't been pressurized in years. So I'm going on the assumption I'll probably have problems sooner rather than later.

Overall plan is figure out what the most affordable options are, when it kicks the bucket ill buy something with the engine I want and do the swap. If it works out what I'd love to do is convert it to electric, I'm just waiting to find out the price of a kit made for converting LJ78's that some mining company makes
 

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