85toyman

iTrader: (2)

I found a 1uz on CL and have been thinking about doing a swap on my 94 4runner.

I have read enough about both swaps to make my head spin. Some swaps got started but the thread abruptly stops and there is no indication if the swap was successful.

I am looking for those who have completed the swap either way and if they are happy with how it turned out. Things they would have done differently.

I guess it goes like this I wanted the 1uz but it appears that it is much more detailed in what it takes to make it fit and that parts are as not as readily avaliable state side. The 3.4 appears to be much closer to a drop in than the 1uz.

The one 1uz I found had been pulled and crated. The owner bought to do the swap on his rig but decided to sell it and buy a Tundra instead. He says that the wiring harness is there but the afm is gone and one of the timing covers is missing, other than that it is complete. He wants $300 and says it was a runner.

I would either have to buy an inchworm adaptor and use the auto tranny which I would have to find or order a bell housing to use my R150 tranny I have.

The 3.4 would bolt up to my tranny and looks to be less expensive.


Just want to weigh my options from others who have been there. I don't want to go to the 3.4 and be unhappy with the power over the 3.0 I currently have. Dont get me wrong I have the ability, tools, and space to fab up anything my heart desires, but I don't like to do things twice.

Any input would be appriciated, but I am looking for what you have done, not from people who have opinions about what they would do. If you have done it post away.

vital22re

iTrader: (2)

heres the deal, the 3.4 is easier to do hands down.
But the 1uz is more power and much harder.
The 3.4 is deffinetly a step up in power and in gas efficiency.

The question is, how much hassle do you want for what amount of power gain?

85toyman

iTrader: (2)

Are you happy with the 3.4 you did. I noticed you have the SC. Did that because you wanted it, or just wanted more power once you had the motor installed? What kind of gas mileage are you getting? I average about 15-17 highway now and 13-15 in town/towing with the 3.0

vital22re

iTrader: (2)

It was a noticable gain in power, then i added the heavy front bumper and then taller e rated tires. Power and mileage dropped. And then I came accross the sc for 400 bucks.. can't say no to that. I was getting 220 miles max on a tank with 4.56 and 31's with the 3.0. After the swap i was getting just over 300 miles on a tank. Now with the sc i get 220- 260 depending on my foot and if i'm running highway or city.

TNRabbit

NOBODY in North America has managed to do a successful 1uz swap into our gen trucks yet that I can find. TONS of issues to overcome. 3.4 is as close to bulletproof as you're going to get.

I came VERY close to attempting the 1uz swap but after several months of research determined it just wasn't feasible.

toy4whatever

The 5VZ is a much easier swap compared to the 1UZ. The entire driveline needs to be moved in order to get the 1UZ shoved into the tight area. Yes there are going to be issues with any swap and you definitely want to do your research before pulling the trigger. If you have the coin there are companies to get everything you need to do the 1UZ swap.

wiring harness: http://www.phoenixtuning.com/
flywheel: http://www.lcengineering.com/
adatper for R150: http://www.ebay.com/

dntsdad

Love my 3.4 swap. A huge stepup in power over the dog of a 3.0. At first I had an auto trans that came with my donor 97 Runner and then made the switch back to manual. That was a huge step up in power as far as seat of your pants goes. The 340f was a like a parachute was attached the the tailgate compared to the 150R manual. I have since installed dual cases as well. Haven't driven it yet as I will fill the cases and trans with new oil tomorrow and take it for a spin..........hopefully!!

I have read up on the 1uz swap as well and for me, the cost, and the PIA factor are not even close to worth it.

I guess it really depends on how much cash you have, and what your purpose is. If you are going to wheel I can't see the need for the 1uz, but that is just my opinion.

RMA

the 3.4 is a good engine .. its fine for the pick up but in my opinion not for the 4runner .. you will , at the very least get the same if not better gas mileage than your getting now. i get better than i did with the 3.0 and with more power and just feels way better driving my 4runner.

i can now say its not really hard , its work but not hard , lost of small stuff to get past.
before the swap i myself made the swap seem harder than it really was, mainly because of all the info out there, some contradictory .

the auto 1uz swap is the cheapest of the 1uz swaps , the t-100 transfer case and extension housing is half the price of the inchworm adapter , but cant be regeared.

if your gonna crawl then you dont even need to swap engines , just get the dual cases and youll be like lots of guys doing it everyday.

There are a few guys in north america with running 1uz's in their 2nd gen 4runners and 3rd gen pick ups toyminator ,birdduck,yota 3.0 , and their threads are here on yotatech.
https://www.yotatech.com/forums/f161/

heres the 1uz wiring diagrams , free!!
they will only be up for 60 days so get them now.
http://www.lextreme.com/forums/showthread.php?t=13604

honestly the hardest part is getting the parts
get the whole car , pass on this engine , part out the rest and youll do fine.

man this was the first engine swap ive ever done , I collected coins and currency before this whole truck deal .. if i can do it its not that hard ..dont get me wrong im not trying to say im retarded its just , its not hard, as long as your not afraid of a little work.

raddude666

dude dont let them fool you sure the 3.4 has power but it doesn't stand to the 1uz my dad has one in his 96 t100 and its a crazy running little truck but it is a lot of work to do it i personally suggest the 1uz bc i put it in my car (240sx) and helped my dad put it in his t100

toyminator2000

The only real difference in the difficulty level of the two swaps is the 1uz requires you to custom fit the engine/tranny by making your own motor mounts and mounting locations. You also have to custom fit an aftermarket radiator becuase the factory one isn't big enough. Careful planning is necessary because there is very little wiggle room as far as engine location. The 3.4 swap allows you to re-used all the 3.0's mounting locations and the only fitment issue is hood clearence.

On the flip side, the 1uz can be aquired much cheaper than the 3.4. All of my 1uz doner cars I bought for $700 or less and actually came out ahead after selling the rest of the parts. The 1uz is all aluminum so it weighs less than the 3.4. The power difference is obvious. It would take a $2000 TRD supercharger added to the 3.4 to equal the 1uz's power. There is also the "wow" factor. A Lexus v8 is not something you expect to see under the hood of an older Toyota truck/4Runner.

If you do choose to attempt the 1uz swap I would highly suggest finding a complete donor car. That way you know you have all the needed parts. Plus you can re-use some of the nickel and dime stuff that would add up quick if you had to go buy them. (ie, bolts, nuts, clups, wiring, etc.) The fuel economy is about the same with both engines.

Here is a link to my swap in my 1989 pickup.

https://www.yotatech.com/forums/f161...e-swap-207835/

tried4x2signN

IIRC, the 1uz is a high compression engine, so it will require high-test gas.

Currently over $3.50 a gallon here at the moment.

And power corrupts. I.e you will be on it more and a truck is NOT as aerodynamic as a car, so forget comparing the MPG of the two.

The 3.4 should almost already just be a bolt-in. And run on low test.

So get the 1uz if you absolutely have to have the two more cylinders, less MPG and want a slightly more complicated swap...

85toyman

iTrader: (2)

Thanks for everybody's input so far. I like to hit the skinny pedal now but that is so the 3.0 will actually go somewhere. Once the pedal actually does something I won't be to hard on it.

Which kind of gas are those of you with the 1uz running? Regular or premium? I am leaning towards the 1uz just for the wow factor as mentioned, and for towing. I currently tow a 17' travel trailer now and would like some more power for hills. How about heating issues of the much larger motor in such a small engine bay. Toyminator I have read your thread and am impressed.

I am thinking that I would run into more complications running the 3.4 and then adding a SC to the mix.

Would the 1uz fit if I modified my hood with the hood scoop? I just built custom cross members that lowered the diff. I installed the BJ spacers and then the diff drop and noticed that it only lowered the rear of the front diff. Stupid--- so I custom built a front cross member that lowered the front of the diff 1" into the cross member but kept my ground clearance, and it put the angel of the diff back to stock. I am hoping that lowering the diff 1" and then the hood scoop the motor will fit... Any ideas or suggestions...

Next question is about the tranny. I have read some that used the auto and other the manuel. Can the R150F handle the hp of the motor or should I use the auto that is behind the 1uz and then add the adaptor.

I do mild to moderate trail riding. Mostly exploring the Cascade and coastal mountains here in Oregon and Nor Cal. I would like to do the Rubicon some day. With that said I don't need to rock crawl.

toyminator2000

The 1uz fits fine under the hood with no body lift. I made a scoop for mine to help airflow under the hood but I don't know if it's actually necessary.

vital22re

iTrader: (2)

hey i got my 3.4 swap done for 2100. The 3.4 will be a giant kick in the pants and can be done over a weekend.

85toyman

iTrader: (2)

You got the wiring done and a complete engine installed in one weekend?

vital22re

iTrader: (2)

with the wiring i printed out all the pages out the weekend before and found the connectors i have and made a list. Kind of prelabeled if you will. So actually 2 weekends. But all the mechanical can be done in a weekend.

85toyman

iTrader: (2)

ok, cool thanks. Any good pointers or obscure stuff you ran into that will help with the install?

I may pm you when I actually get ready to start if you don't mind.

85toyman

iTrader: (2)

Ok I found a 1uzfe for $250 already pulled out of the car with the wiring harness, but missing the ecu and afm. The guy bought it from a wrecking yard supposedly a running engine.

Does this seem like a descent price for one of those motors?

toyminator2000

Yes but you need to find the correct year and model ECU because they are not all the same. You will need to come up with something for the o2 sensors.

85toyman

iTrader: (2)

I have passed on the motor for the reasons you mentioned. He did not know. I have decided to do the 3.4 swap. It looks to be much easier to get done in much less time. Frankly the 1uz is what I want but I can't justify the amount of money or time it's going to take to get it completed. If I need more power I will just install the Super Charger.

I think I would like to steal your idea of the hood scoop and blending it into my OE hood.

Thanks for everybody's help