1.5jz-gte question

[Halle Terry]

hey all, ive been thinking about the 1.5jz-gte topic

if i had a 2jz-gte (twin turbo)

and a 1jz-gte (single turbo)

when u bolt them together (1jz top 2jz bottom) what would be more likely to be kept, the single or the twin setup?

im thinking the twin because of the exhaust flow to the turbos - or is the turbo setup irrelevent?

or would it be more likely to use a 1jz-gte with twin turbos, because they share the same basic setup. (but wouldnt having vvti better?)

im not exactly mechnically gifted but im wondering what would happen.

and is there any proof the 1jz head flows better then the 2jz?


heres a sexual harrasment emotcon thrown in for good measure :3some:

[Sciflyer]

1jz vvti head on non-vvti 2jz block has potential for much drama

Avoid.

[Brockas]

hey all, ive been thinking about the 1.5jz-gte topic

if i had a 2jz-gte (twin turbo)

and a 1jz-gte (single turbo)
Then you should just use the 2JZ-GTE. The only reason someone goes 1.5JZ is because they have spent a lot of money on their 1J already (ie. cams, porting, big single with 1j specific manifold etc etc).



when u bolt them together (1jz top 2jz bottom) what would be more likely to be kept, the single or the twin setup?
If you're bolting the 1J vvti head to the 2JZ bottom end (there will be bulk dramas), you only have the choice of using the single turbo, unless you made up custom manifolds for the 2JZ twin setup (pointless).


im thinking the twin because of the exhaust flow to the turbos - or is the turbo setup irrelevent?
The twin turbos of the 2JZ have been known to flow around 400rwhp. While the twins from the 1JZ will struggle past 300. The single on the 1J I wouldn't know about, I don't think anyones even bothered to push one.


or would it be more likely to use a 1jz-gte with twin turbos, because they share the same basic setup. (but wouldnt having vvti better?)
You're getting yourself confused here.
If the 1JZ-GTE is Twin Turbo, it's NON VVTi.
If it is a factory single turbo (post 1996) it is VVTi.


and is there any proof the 1jz head flows better then the 2jz?
Nope, none.
I'm pretty sure there was a thread on supraforums where someone used a flow bench to prove a 1J head is nothing special...

[Muppet_Guy]

I think this whole myth about 1J head flowing better started when someone said somewhere that because Yamaha designed the 1J head, it is automatically better than the Toyota designed 2J head, due to Yamaha's air flow expertise in their musical products or some shit like that.

If I had a stock 1J and a stock 2J sitting next to each other, I'd pick the 2J straight away. If I had limited funds, I'd choose the 1J coz cheaper. And yeah, what paul said about the reason to build a 1.5J...

Does the 1J you're referring to have a stock single turbo or aftermarket?

[Halle Terry]

"or would it be more likely to use a 1jz-gte with twin turbos, because they share the same basic setup. (but wouldnt having vvti better?)"

yeh when i said that i sorta meant wouldnt the vvti version of the 1jz-gte be better (even tho its quite appernt there will be "bulk dramas" from everyones comments :P)

oh yeh and this question was completely hypothetical, its like my dream of having a series 8 fd, with a single turbo 13b-msp in it :) speaking of which

if anyone could make a hypothetical street car - what would everyone make, i figure il leave it open to reasonable ideas - ie something plasuable to come out of a factory, yet still creative, rb25det 4door s15 - that would be snazy, like a chaser, cept nissan

and stupid ideas: 20b powered awd civic running on deisel.

[Tats]

The single on the 1J I wouldn't know about, I don't think anyones even bothered to push one.

Allegedly it self-destructs with too much boost (>14psi). Plenty of bolt-on replacement options from Japan so spending money on development is kinda pointless.

[Brockas]

Isn't it a triangular flange?

Surely wouldn't be too much that bolts onto that, maybe a trust turbo of some sort??

[upgarage]

the 2jzgte head actually flows more than the 1jzgte head so the rumours are bullshit
therefore you would want a 2jzgte to start with

the standard 2jz turbos make good power but a nicely matched big single FTW

[Endless]

As said vvti and non-vvti head/blocks WILL NOT go together.

It has been proven the 2JZ flows better than the 1JZ head, just a myth made up as people couldn't make sense of why japs would make 1.5JZ..
But as Brockas mentioned above it's done if you have some coin spent on your 1JZ head already yet want 3L.

There's an IS200 toymods with vvti 1J and has bolt on factory replacement HKS 3040R.

[CyberNetiC]

VVTi turbos kits are avaliable, but they're somewhat rare, by no means "easy to get" and when they do come up, they're not cheap.

2J is good if your planning to fuck off the stock turbos, they're dog shit.

standard 1J turbos depend on their health, but 350 rwhp is acheivable if you get a cared for set, there are a few cars here in WA pushing 300rwhp, and a few of the JZZ30 soarer boys are upwards of that, stock turbos have allso netted a high 11 (11.8 i think) in a boat spec JZZ30.

[S_E]

Isn't it a triangular flange?

Surely wouldn't be too much that bolts onto that, maybe a trust turbo of some sort??

T3 according to this.... http://www.jzx100.com/forum/index.php?s=&showtopic=229&view=findpost&p=15307

Which gives a much larger choice of turbos, so a jap kit shouldn't be necessary, just a GT30 or so and plumb up the cooler pipes and oil/water lines.