yota master

my 3.4 auto with 33's was by far faster than my 3.0 manual with 31's both with stock gears.. any ways does anyone have any wiring tips on keeping my auto ecu or maybe a diagram of some sort? will my wiring harnesses from my tacoma fit my 4runner? also any ideas on a custom crossover pipe? i really wanna get started on this project this weekend so any personal info or tips will help

neoworm0

I think you just answered your own question.

Tacoclimber

A little crazy's never a bad thing.

The "feeling" of change from a 3.0 to a 3.4 won't be extreme. But keep in mind, the "feeling" is going to be different than actual numbers.

Remember though that with a 4runner up against a T100, you're still comparing apples to oranges. Well, kinda. If the curb weight of your Runner matches the curb weight of his T100 (And IIRC they're about 4K lbs), then you'll have a better idea of what your 3.0 can do against his 3.4. But then again, you've got the questions of age, mileage, manny or auto, etc.

I know when I did the deckplate and ISR mod on my truck, I don't know if I really got 10 more hp like everyone said it would, but my butt dyno liked the change.

In the end, if you like your 3.0, stick with it. I'll stick with my 3.4. If it was me in the situation, and I could, I'd go with a 3.4. But hey, maybe I'm just crazy.

Justinlhc

Strange. The T100 I'm talking about has about ~125k miles and is a manual. My 4runner has 232k miles and is a manual. He has 32x12.50 and I have 31x10.50. Both should weigh pretty much the same. There is no way he would pull away from me by much, if at all, but who knows. I don't want to start a 3.0 vs 3.4 debate. I just wanted to say I'd never swap a 3.4 in unless it was sitting there(or I could get one for the same price) and my 3.0 was shot.

I will say his 3.4 seems smoother and quieter than my 3.0 but that could have alot to do with my headers/exhaust and not having carpet.

904_runner

Yup i sure do!

Okay search on here for the link to a custom 3.4L crossover pipe. Thats the link i used to make mine.

You will have to use the enigine harness from the 3.4 tacoma.

Go onto my build thread (in my sig) towards the end of my build up is where there is a bit of info on links and such to look at. TIS is a site you can look up where you pay $10 a day to download as much of the factory wirign diagrams you can get. ALso look at ttora for their fsm. those will help you tremendously.

As far as the wiring goes, i had SOOOOOO much help from vital22re and thats how i ended up completing it. But for the main point, i ended up taking a wire and jumping the two wires together to override the neutral/park safety switch. ( I think it was wires 13/14 on connector d? ) that might be wrong but you will see when you dive into the wiring diagrams. I believe this makes the comp think its in neutral all the time. I don't have any CEL's and ive put 2000 miles on it so far. I would look into finding the manual ecu if you can find one though.

I couldn't agree more.


Nope 3.0 was noisy as hell. I got so fed up hearing my fuel injectors tick i was starting to go insane. LOL..

The 3.4 is a lot smoother running in my opinon. THe throttle response is also much quicker and stronger than my 3.0..

Completely glad i did this swap.

yota master

thanks for all the info man about how long and painful was all the wiring and what will i need to do about my body harness

904_runner

Probably took me less than two days. I spent like 3 hours on the phone with vital22re working on it. then the rest of the time was studying schematics and splicing the wires...

Justinlhc

Hahah, same here. Sometimes I get worried when I drive it after driving something else that isn't a massive ticker. I wish I could drive a 4Runner with a 3.4 to get a more similar comparison. Chances are I'll be buying a Tacoma soon and it will have one I can "test" . Thanks for replying to my slightly off-topic BS.

Tragic Drive

My 95 4Runner has a Blown Motor to..


9.5 PSI and I ain't looking back at the 3.0.
But if your happy with the 3.0 just rebuild it with a better exhaust manifold. That's the weakest spot on the 3.0 IMHO.

Justinlhc

^^^I was trying to figure out what you meant by "9.5psi" and then I saw the pulley. That would make it worth the swap to me.

904_runner

That is pimp...................


NICE!!!

id like to see the difference in the S/C vs non S/C motors.

Kiroshu

Alot of people get real mad at the 3.0.... but you gotta remember the 3VZE was one of toyotas first v6s. It was a work in progress and for its very first v6 was not bad at all. the 3.4 was basiaclly a motor from toyota saying we are going to make the perfect v6 with little to no probs. and they did 3.4s are an extremely reliable motor and were used a while. I've had 2 3.0s and they were both good to me... if you don't like motor noise? then you better buy a new toyota every 2-3 years. if not adjusted properly they will make noise and tick injectors just means they are gettin a little old....its all up to you i guess since you got money and parts get to it.....

yota master

ok ive pretty much been talked into it (which didnt take much anyway) so i have all my wire diagrams and both rigs side by side ready to go! if anybody else has any tips or info about this swap it would be much appreciated!

Tragic Drive

Good choice, Check this section of Yotatech if you haven't already
https://www.yotatech.com/forums/f160/

Noltz

I've got a '95 (190k miles) and a '97 (128k miles) 4Runners's sitting in my driveway right now. His & Hers . The 97 is definitely the smoother & stronger engine. I had a '91 too, also with the 3vze, that had dealer maintenance from day one and it ran just as smooth as my '97's did. It's all in the maintenance.

That said, I'll slam a 3.4 in it when she starts leaking. Minor electrical stuff, add an exhaust and the rest bolts together.

Baja Toy

Hey Jota Master,
I am not sure if you plan to use a body lift to clear the additional height of the 3.4 motor. If you are, try doing it prior to dropping the motor in although it is not a must.

You are gonna need to reuse the 3.0 oil pan and probably relocate the oil dip stick so I recommend you do that before dropping the motor in. Although not required, try to keep all peripherals on the 3.4 (AC compressor, alternator, etc).

I have the Auto Tranny part of the harness I didn't use since I used a manual tranny, so you can have it if you want it.

I am trying to wrap up the wiring this week and should be able to fire it up by Friday. Good Luck, it is a fun project.

xzyragon

screw 3.0 and 3.4... 22re all teh way !!!!!

yota master

thanks for all the good info and links everybody, i started yesterday but rain is holding me up right now! Ill keep everyone updated on progressw as i go and try to take some pics

yota master

ok so i was taking the motor out last night and started thinking?? am i reusing any of the smog or vacuum lines from the 3.0? or should i just transfer all of the stuff over from the 3.4 engine bay? how about where body and engine harness are wrapped into one, do i just unwrap it to leave the body harness in place then rewrap with the new engine harness? i just want to be sure since i havnt really dug this deep into smog or electrical harnesses before, thanks!

yota master

sorry i reread one of the links and see what i need to keep and can, can i use the 3.0 clutch and parts? what flywheel will i need on the 3.4?