1jz or 2jz?

[428_CBRA_JT]

ok well i have an 86.5 N/a right now and that is how it is going to stay but im getting a single turbo this summer and hopefully a jspec tt in the years to come.. my question is
A) can a 2jz fit into an MKiii
and
B) What are the main differences between the 1jz and 2 jz if any...

thanks in advance to anyone who can help me out here

Benn

[TcmaBoy]

The 2JZ is similar to a 1JZ. The main difference is that the 2JZ has a taller block. The taller block allows for a longer stroke that gives the 2JZ is 3.0L displacement. The 1JZ has a 2.5L displacement.
The 2JZ used twin sequential turbos. The 1JZ used twin parallel turbos. On later models equipped with VVTi the 1JZ used a single turbo.


The heads are different. The 2JZ head has slightly better porting. The 2JZ and 1JZ heads are interchangeable, along with the cams, and head gaskets. Due to different porting the intake and exhaust manifolds are not interchangeable.

The flywheel is not interchangeable.

The 1JZ uses the same clutch as the 7MGTE, but not the same fly wheel.

The 1JZ uses the R-154 manual trans. Which is the same as the trans. in 7MGTE equipped Supras. It uses a different bell housing.

The Auto trans (A340E) is the same way.

The accessories such as the PS pump, AC unit, alternator, and water pump are interchangeable.

The spark plugs are the same.

The oil filter is the same.

The serpentine belt is the same.

The timing belt is not.

JDM 2JZ injectors can be used on the 1JZ. The USDM 2JZ injectors cannot.

For engine swap purposes the 1JZ is easier because it came in the MK-III Supra. You can buy a JZA70 half cut and get everything you need to do the swap. The 2JZ swap is possible, but more work. Another option to consider is a 1UZ or 3UZ swap. They are the 4.0L and 4.3L V8s in the Lexus line. They involve a similar work level to swapping a 2JZ.

[428_CBRA_JT]

thanks.. yea ive had people suggest the v8s but i am a fan of the IL6 (stupid stupid nissan if they go for 8 in the new skyline) is the power outage much different between the 1 and 2?

and well most of all if i get the half cut i sould have all the front clips and the firewall to swap out BUT would i have to do anything to make it drivable as far as standards... i know that the rhd cars need to pass certain tests so would i have to do that if i wanted to drive rhd?

and would it be easier to find a 2.5tt imported already with rhd and work from there(id think so but im not sure)

and well i guess would i be able to bore the 2.5 to a 3.0? and if i did what else would i need to look into?

once again thanks alot for the info so far


Benn

[TcmaBoy]

The bore on the 2.5 is the same as the 3.0. The difference is the stroke. The 2JZ puts out about 20% more power than the 1JZ. The 1JZ can be built to the 800 HP level. Unless you are trying to make more the 1JZ should do nicly.

Bore Stroke
1JZ 86 mm 71.5 mm

2JZ 86 mm 86 mm

There are stroker kits out there for the 1JZ, but they are expensive. $2,200 for rods 1,800 for pistons.

I don't know why a rod and piston set for an import costs as much as a built chev small block. I think its a rip off.

As far as RHD conversion you would have to look into your state laws governing modified and kit cars.

Finding a legitimate JZA70 Supra in the stats is hard. I have seen a few on ebay, but I don't know if they were scams or legit. The easy way to do this is to import a half cut and swap the engine in. The 2JZ swap is possible, but requires a lot more custom work. Its not a bolt in affair.

If you want to do a RHD conversion then I would find a half cut with all the parts needed for the conversion. The big things are the dash, steering column, and steering rack. Most of the rest can be made. I like LHD. With a RHD car things become a pain. Be prepared to never use a drive thru agian.

[M3 Special]

Originally Posted by 428_CBRA_JT

thanks.. yea ive had people suggest the v8s but i am a fan of the IL6 (stupid stupid nissan if they go for 8 in the new skyline)
Benn

the new Skyline, actually only called the GT-R, is a Twin Turbo V-6.

[eps]

Originally Posted by TcmaBoy

The 2JZ is similar to a 1JZ. The main difference is that the 2JZ has a taller block. The taller block allows for a longer stroke that gives the 2JZ is 3.0L displacement. The 1JZ has a 2.5L displacement.
The 2JZ used twin sequential turbos. The 1JZ used twin parallel turbos. On later models equipped with VVTi the 1JZ used a single turbo.


The heads are different. The 2JZ head has slightly better porting. The 2JZ and 1JZ heads are interchangeable, along with the cams, and head gaskets. Due to different porting the intake and exhaust manifolds are not interchangeable.

The flywheel is not interchangeable.

The 1JZ uses the same clutch as the 7MGTE, but not the same fly wheel.

The 1JZ uses the R-154 manual trans. Which is the same as the trans. in 7MGTE equipped Supras. It uses a different bell housing.

The Auto trans (A340E) is the same way.

The accessories such as the PS pump, AC unit, alternator, and water pump are interchangeable.

The spark plugs are the same.

The oil filter is the same.

The serpentine belt is the same.

The timing belt is not.

JDM 2JZ injectors can be used on the 1JZ. The USDM 2JZ injectors cannot.

For engine swap purposes the 1JZ is easier because it came in the MK-III Supra. You can buy a JZA70 half cut and get everything you need to do the swap. The 2JZ swap is possible, but more work. Another option to consider is a 1UZ or 3UZ swap. They are the 4.0L and 4.3L V8s in the Lexus line. They involve a similar work level to swapping a 2JZ.

I just wanted to make some corrections to this.

The 2jz cams and 1jz cams are not interchagable. The cam gears are.
The USDM 2jz injectors DO fit the 1jz fuel rail.

[428_CBRA_JT]

thanks again.. ok one last question.... POSI... possible? if so what exactly must i do ive looked a lil into it something about changing a carrier.... but yea dunno id rather not have a 1 wheel wonder...

[TcmaBoy]

There are plenty of LSDs out there for the Supra. Including a factory one. Pick one and have it put in.

[428_CBRA_JT]

thanks well now im off to find out how to get her to run thanks again for everyones help