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2RZ Questions-EZ

toyotajeep

Well-known member
Joined
May 24, 2020
Member Number
1309
Messages
282
Loc
Oregon
I am preparing to buy a built up 4Runner with a 2rz swapped. I have owned a 3RZ Taco I drove for about 6 years straight. It was rock reliable and good on fuel.

The 4Runner is a typical 35's, SAS, bumpers 2nd gen 4Runner. What should I expect for performance and mileage? Engine is dead stock.

I used to know a guy who claimed when he swapped one he picked up 3-4 Mpg and it was great, best ever etc. He may have been delusional.

Any experiences with a 2RZ stock in a built up rig? MPG? reliability? I know it will be better than a 22re.

Thank you for your thoughts!
 
2/3RZ engines are great. I have them in a few different vehicles. One has 35s and a 5-speed with 4:10s and 5th gear is pretty much useless. But even screaming at 2900 rpms in 4th gear, it gets 18ish mpg. It has almost 400k miles on it and id drive the damn thing anywhere. I also have a turbo swapped 3rz in my FJ40 and that fucker rips.
 
I have a 2rz in my buggy and it's awesome for what it is.
No idea on mpg but it's been upside, fed watered gas and still rips.
 
the_white_shadow said:
2/3RZ engines are great. I have them in a few different vehicles. One has 35s and a 5-speed with 4:10s and 5th gear is pretty much useless. But even screaming at 2900 rpms in 4th gear, it gets 18ish mpg. It has almost 400k miles on it and id drive the damn thing anywhere. I also have a turbo swapped 3rz in my FJ40 and that fucker rips.
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I was going to mention you since you have a few on hand. When I swapped in my 2rz from my tired ol 22re, seat of the pants feel is great. Add boost, even better. As far as mileage nothing of substance to offer as it is trail only. Still burns about the same amount of fuel on a wheeling weekend.
 
All good to know. They used the ORS swap harness. It has a larger exhaust without a mechanical cooling fan, but is otherwise stock. Feels really good. Driving it around the yard. Will get it out on the highway soon. Thank you for your input. I’ll post up some data when I have some thing. I’ve never had a vehicle with over 200:1 crawl reduction. It’s pretty awesome.
 
I have a stock 2wd 2rz pickup. That will see a solid axle swap. For now in stock form It gets over 30mpg and feels like a super 22re. Considering they are the same displacement the 2rz is a much better performer.

It has 200k miles on it and doesn’t burn any oil between oil changes. I did check the valve lash on it as they are known to burn valves if you don't keep them in spec. It was fine. No adjustment required. It does have a similar tick noise when warm like a 22re but I believe this is from a known wrist pin tolerance issue. Apparently a non issue for durability but does cause some noise. This is also true with the 3RZ and the 2TR engines as well. Lots of threads about it.
 
I'm about to swap mine in the next month so I'll have a definite answer then. I've upgraded my crawler just like dirtyjed with a 3rz and it makes a huge difference compared to a clapped out 22re.
 
Sluggy said:
I'm about to swap mine in the next month so I'll have a definite answer then. I've upgraded my crawler just like dirtyjed with a 3rz and it makes a huge difference compared to a clapped out 22re.
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Sweet. I always preferred these engines to the R series even though the R series are reliable etc.

I'm going to include some data etc. once I get my truck assembled for the street. Should be by the end of November.

I'm not expecting 3.4 performance, but a little more than the 22re would be great. Sounds like I should easily be there.
 
Was never a fan of toyota v6's felt they only made great 4cyl or v8 engines.
 
toyotajeep said:
Sweet. I always preferred these engines to the R series even though the R series are reliable etc.

I'm going to include some data etc. once I get my truck assembled for the street. Should be by the end of November.

I'm not expecting 3.4 performance, but a little more than the 22re would be great. Sounds like I should easily be there.
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My 2wd 2rz is slower than my 4wd 3.4 no contest. The power band is just much broader on the 3.4. A low boost supercharger might be all you need to change that though.

It does feel much better than a 22re however and I love that its much easier to work on than the 3.4L. For a wheeler I would pick an RZ every time.
 
I have always wanted to do do a 3rz swap but could never find one with a complete harness. Junk yard always cuts the harness and pulls the engine.

I have found 2rz's but looking at the numbers I dont know if it's worth the cost to swap. The gain in torque with the 3rz is almost double compared to the 2rz.

22re - 140 lb torque
2rz - 160 lb
3rz - 177 lb

I have heard that the 2/3rz harnesses are the same and a 3rz can be dropped in a 2rz truck with no wiring needed. Anyone know if that's true?
 
ToyodaAddict1980 said:
I have always wanted to do do a 3rz swap but could never find one with a complete harness. Junk yard always cuts the harness and pulls the engine.

I have found 2rz's but looking at the numbers I dont know if it's worth the cost to swap. The gain in torque with the 3rz is almost double compared to the 2rz.

22re - 140 lb torque
2rz - 160 lb
3rz - 177 lb

I have heard that the 2/3rz harnesses are the same and a 3rz can be dropped in a 2rz truck with no wiring needed. Anyone know if that's true?
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Had a customer throw 40's and a turbo at a 2wd 2rz pickup. It did pretty well:smokin:
 
The difference between 160 and 177 is 17.
That is definitely not double.

In real world driving I'd say they are pretty much the same except 3rz heads tend to blow more often than 2rz.

As far as the harness, it wouldn't surprise me if they were the same.
 
Dirtyjed said:
The difference between 160 and 177 is 17.
That is definitely not double.
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I'm saying with the 22re at 140 and a 2rz at 160 you gain 20. With the 3rz at 177 you gain 37 almost double. That seems like alot to give up.

This is just numbers I'm looking at. I dont know what the real world performance between the two is.
I like that the 2rz doesnt have balance shafts. Less parts is nice.
 
Harness from what I can tell from the swaps I've done are the same. You have the early distributor style, dual coil and the coil on plug. I've dealt with the dual coil style only with swaps. Call ORS they are great for knowledge.

Heads are the exact same between the 2rz and 3rz. Reason they fail is people don't do the valve lash around 150k or they over heat it.
 
Also deleting the balance shafts is way easy, can be done with factory parts. 2rz timing chain oiler and clocked balance shaft bearings blocking the oiling port.
 
Don't delete the balance shafts. It causes a miserable vibration above 2000 rpm, and the clutch disk shakes so bad it doesn't disengage properly and it's a bitch to shift gears. Fortunately I kept the parts and added it back in.

And I've bought several trucks with burn valves super cheap, knowing it's a relatively easy fix.
 
My current balance shaft deleted rz is in my buggy so everything has a vibe with solid motor mounts. 10 years of running it offroad like this, I never experienced any clutch issues. Just my .02
 
A turbo is pretty easy since the factory ECM can handle about up to about 8-10 boost. Pink top injectors, t3/t4 turbo, turbo manifold, intercooler and you are good to go. Anything more than that will require an aftermarket ECM. Here's a pic when I was doing mine..

boost.jpg
 
Boomtacoma01 said:
A turbo is pretty easy since the factory ECM can handle about up to about 8-10 boost. Pink top injectors, t3/t4 turbo, turbo manifold, intercooler and you are good to go. Anything more than that will require an aftermarket ECM. Here's a pic when I was doing mine..
Click to expand...
What about tuning, does the ECM take care of all that? Just slap the parts on and done deal?
 
I've alway heard they don't like over 6 psi with stock ecm. I have a 5th injector kit for mine that I'm about to install
 
20200218_172524.jpg

3rz I built for my buggy, plan is a early svo 2.3 turbo and intercooler.
20230305_152638.jpg

2rz super charged for my runner
 
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