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Location:
UK
Registered:
May 2002
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1.5JZ
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Wed, 25 February 2004 16:45
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Anyone know of anyone who's done this? or knows of any documentation of what it involves?
Cheers
adi
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Location:
Osama's hideout
Registered:
February 2003
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Re: 1.5JZ
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Wed, 25 February 2004 22:56
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i too am looking at doing this conversion, and i too would like to speak to anyone who has actually done it or has documentation on it.
hedgehog sandwich
email me at crichtos@anz.com
and i will tell you what i do know so far from my investigations.
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Location:
winmalee
Registered:
December 2003
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Re: 1.5JZ
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Thu, 26 February 2004 07:21
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if you guys can get a back issue on "SPEED" magazine, it has an article from a year or more ago about a guy who bought a 1.5J soarer import from japan. it had some crazy power output of 300kw standard or something on relatively small boost. it isn't a step by stpe guide on what to do, as the guy bought it as is from japan, but it'll give you a bit more info about the engine.
if you guys didn't already know, the 1.5J is a 1J with a 2J bottom end or something like that... who am i kidding though?
call (02) 9263 9729 for the editorial people of SPEED if you're REALLY interested.
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Location:
Lost in the K hole
Registered:
May 2002
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Re: 1.5JZ
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Thu, 26 February 2004 07:24
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why?
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1.5JZ
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Thu, 26 February 2004 09:25
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because the 1j heads are made by Yamaha and the 2j heads are made by Toyota. People think that the 1j heads flow better. I would have absolutely no idea!
And so jzz30/jzx90 owners can tell the 'toyota' uneducated that they still have a 'stock' 1j 
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Location:
Perth
Registered:
September 2003
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Re: 1.5JZ
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Thu, 26 February 2004 09:40
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the 2JZ heads flow considerably better than the 1JZ heads. have a look at the exhaust ports for yourself if you don't believe me.
why anyone would put a 1JZ head on a 2JZ bottom end eludes me.
why would you not 'just' slot a whole 2JZ instead?
that's like fitting a 16V head to a 20V bottom end. it doesn't make sense.... 
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Location:
Perth
Registered:
October 2002
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Re: 1.5JZ
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Thu, 26 February 2004 09:40
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Also, if you've already put cams and custom manifold(s) onto your 1JZ, it's going to be cheaper to just put on a 2JZ bottom end - rather than swap motors and get new bolt-ons.
Justin
Now with manual JZA61! 
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Location:
Lost in the K hole
Registered:
May 2002
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Re: 1.5JZ
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Thu, 26 February 2004 09:43
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imho the 1.5jz concept is just utter BS
ive never seen a shred of evidence to support what is just another yank wank
my 2c
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Location:
Brisbane
Registered:
June 2003
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Re: 1.5JZ
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Thu, 26 February 2004 09:46
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2jz heads are yamaha arent they? I read yamaha on norbies 2jz....
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Location:
Perth
Registered:
September 2003
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Re: 1.5JZ
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Thu, 26 February 2004 09:51
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| Celia-Sue wrote on Thu, 26 February 2004 20:40 |
Also, if you've already put cams and custom manifold(s) onto your 1JZ, it's going to be cheaper to just put on a 2JZ bottom end - rather than swap motors and get new bolt-ons.
Justin
Now with manual JZA61!
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i didn't think of that scenario. you're very right there...
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Location:
Gold Coast
Registered:
May 2002
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Re: 1.5JZ
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Thu, 26 February 2004 11:59
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What do you mean? You don't beleive in them or that they are done what?! puzzling.
Yes, They are done my mostly isisting 1JZ owners that already have cams, turbo, computer etc and just want the next step. Stroking it to 3L the easy way.
here is a comparson picture.
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Location:
Brisbane
Registered:
October 2002
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Re: 1.5JZ
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Thu, 26 February 2004 12:10
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| ed_ma61 wrote on Thu, 26 February 2004 19:43 |
imho the 1.5jz concept is just utter BS
ive never seen a shred of evidence to support what is just another yank wank
my 2c
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Your ignorance is showing. They're extremely rare in the States as they never got the 1JZ. It's the Japanese who do it and yes, I have one.
If the concept is difficult for you to grasp just think of it as a stroker kit for a 1JZ.
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Location:
NSW, East Coast
Registered:
July 2003
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Re: 1.5JZ
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Thu, 26 February 2004 12:32
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Try http://planetsoarer.com/
I think you;ll find info there.
Im the same vote as most people, WHY?
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Location:
Brisbane
Registered:
November 2002
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Re: 1.5JZ
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Thu, 26 February 2004 12:40
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| Quote: |
imho the 1.5jz concept is just utter BS
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I've been reading your posts for a while now and you just lost all credibility.
Who in their right mind would think that adding an extra 500cc capacity to their 1JZ would not be of great benefit?
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Location:
Sydney
Registered:
May 2002
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Location:
Lost in the K hole
Registered:
May 2002
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Location:
Adelaide, SA
Registered:
May 2002
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Re: 1.5JZ
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Thu, 26 February 2004 22:25
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I was under the impression that the 1.5jz started in Japan - after people were wearing out 1jz blocks they found that a new 2jz block/bottom end was the same price from toyota as a new 1jz one. Hence you could "stroke" the 1jz for virtually nothing (if you need a new bottom end anyway).
You'd have to be a bit mad to put a replace your existing 2jz head with a 1j one though!
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Location:
Osama's hideout
Registered:
February 2003
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Re: 1.5JZ
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Thu, 26 February 2004 22:54
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it amazes me how some one asks for info, then a bunch of gooses get on here and carry on with shit about what they think when they have no acutal testing to back up the crap.
the 1J head is designed by yamaha, the 2j head is designed by toyota, the information i have read reads that the 1j head flows better. why do people think nissan owners put rb25 heads on rb30 blocks, its a cheap stroker, and yes 500cc will make a big difference.
this conversion is common place in japan. why would i spend $8000 to $10000 to completely rebuild my 1J when i can simply spend $2-3000 on my head and just put a bigger bottom end on it which allready has good strong components.
if i stick with a complete 2j i will have to make another manifold, and the engine i am looking at buyin is a VVTI version of the 2j, so i dont want to have to buy a expensive computer to run the vvti. any way say what you will, but i will be doing this within the next year or so.
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Location:
Lost in the K hole
Registered:
May 2002
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Re: 1.5JZ
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Thu, 26 February 2004 23:10
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| 1JZ.747 wrote on Fri, 27 February 2004 09:54 |
the information i have read reads that the 1j head flows better.
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care to elaborate...
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Location:
Osama's hideout
Registered:
February 2003
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Re: 1.5JZ
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Thu, 26 February 2004 23:18
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elaborate
yes i can
i read an information sheet where a person had flow tested both heads and found that the 1j head flowed better than the 2j head. that article i read 2 years ago. where it is now i dont know.
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Location:
Lost in the K hole
Registered:
May 2002
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Re: 1.5JZ
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Thu, 26 February 2004 23:20
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be interesting to read if you can ever dig it up
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Location:
Osama's hideout
Registered:
February 2003
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Re: 1.5JZ
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Thu, 26 February 2004 23:24
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from what i have found out so far is the oil galleries and everthing line up, a 2j timing belt has to be used due to the engine being 40mm taller. also a 2j head gasket has to be used.
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Location:
Lost in the K hole
Registered:
May 2002
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Re: 1.5JZ
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Thu, 26 February 2004 23:39
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hehehe... in my reading up on this, i came across this corker of a comment:
"THe 1jz motor revs faster than the 2j because of the head design.
THe cubic inches stays the same. In Japan all the "big dawgs" are running this 1.5jz setup so they can have the torque of the 2j but the faster revving of the 1j, THe compression again stays the same. You gotta remember in Japan they have a horsepower regulation...that is why the skyline, and the 1j & 2j (mk3 &mk4) all have the same factory horsepower ratings of 280ps. THat is why Toyota did not put the 1jz head on the 2j. Also They did this in order to make more torque down low"
and leigh - i agree that yes, 0.5L capacity increase makes a world of difference (der!). and as an upgrade to the 1jz, yes, great idea, especially (as the japs do) if you have endelss access to 2jz blocks etc.
however, consider ::
a) the fact that when it comes to getting the engine number changed (which is on the block!) its going to be perfectly obvious that the capacity has been increased beyond the 'non engineerable' 15% - thus the 'stealth' justification is void.
b) its a lot of fart assing about putting a 1jz head on the 2jz block, why not just drop a whole engine in (unless, of course youve already done significant mods to the 1jz head - or just happen to have a long block sitting around)
c) if youre planning a berserk build, i fail to see why you choose the 1jz head, even if the 1jz head was mildly advantageous over the 2jz head, if you were truly serious about modifying the engine, any of these 'stock' differences would be lost the second you switched on the die grinder.
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Location:
UK
Registered:
May 2002
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Re: 1.5JZ
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Fri, 27 February 2004 01:07
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blimey you lot have been busy since i asked this
To all the doubters.....
The reason most 1.5JZ's are created is due to the fact that is an easy upgrade/rebuild to a 1JZ with a faulty bottom end (which incidentally, mine is now suspect of this very thing, hence the question).
If your 1JZ bottom end goes, you have two choices.. take the engine out, rebuild the bottom end, and plonk it back in... *OR* for virtually the same money (perhaps less) buy a decent working 2JZ block, and slap your 1J head on it.
You've saved yourself time, money, and you've got another 500cc to play with, you've also got the same wiring loom,ECU (possibly) and lot less hassle than droppping in a 2JZ complete engine and farting around with wiring harnesses, ECU's blah blah..
TThats why people do the 1.5JZ... its an easy cost effective and very worthwhile repair whilst being a fantastic mod.
cheers for the replies..
adi
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Location:
Osama's hideout
Registered:
February 2003
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Re: 1.5JZ
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Fri, 27 February 2004 01:08
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a, no problem in a cressida
b, not a problem either, have a spare 1j head to get worked and cams put in, drop it onto motor, 16 hours approx to take my engine out drop next one in and change over the turbo manifold etc.
car off the road for say 3 days.
c, cause the 2j is a vvti model and i dont want it, and overall
because i can,
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Location:
Osama's hideout
Registered:
February 2003
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Re: 1.5JZ
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Fri, 27 February 2004 01:08
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manny thanks for your input there too. thats helpful.
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Location:
Lost in the K hole
Registered:
May 2002
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Toymods Club Treasurer
Location:
Sydney
Registered:
May 2002
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Re: 1.5JZ
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Fri, 27 February 2004 01:55
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Didn't Martin Donnon from HPI do this to his 1J Soarer?
I think there was a whole article on it, but can't remember which issue.
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Location:
Osama's hideout
Registered:
February 2003
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Re: 1.5JZ
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Fri, 27 February 2004 03:12
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no his was a internally standard 1j
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Toymods Club Treasurer
Location:
Sydney
Registered:
May 2002
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Re: 1.5JZ
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Fri, 27 February 2004 04:27
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It must have been a different car then, but I remember it was in HPI, and it was done in Oz.
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Registered:
March 2003
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Re: 1.5JZ
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Mon, 01 March 2004 12:05
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does anyone have any idea how much a 2J short block costs from toyota?
if you were looking into this it might be cheaper buying it brand new rather than getting a whole engine.
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Location:
Sydney
Registered:
March 2003
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Re: 1.5JZ
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Mon, 01 March 2004 12:24
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| speakafreaka wrote on Mon, 01 March 2004 23:05 |
does anyone have any idea how much a 2J short block costs from toyota?
if you were looking into this it might be cheaper buying it brand new rather than getting a whole engine.
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$5400, GST inc.
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Location:
Osama's hideout
Registered:
February 2003
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Re: 1.5JZ
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Mon, 01 March 2004 22:50
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$5400 inc GST, thats cheap i spoke to a guy last month who paid $9000 for one still in toyota plastic.
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Location:
Perth
Registered:
September 2003
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Re: 1.5JZ
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Mon, 01 March 2004 23:52
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| ed_ma61 wrote on Fri, 27 February 2004 10:39 |
b) its a lot of fart assing about putting a 1jz head on the 2jz block, why not just drop a whole engine in (unless, of course youve already done significant mods to the 1jz head - or just happen to have a long block sitting around)
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my point exactly....?
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Location:
brisbane
Registered:
July 2003
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Re: 1.5JZ
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Tue, 02 March 2004 06:59
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I thought the point of a 1.5JZ was to put the later model 1JZ vvt-i head (which apparently flows better due to improved head design) and throw that onto the 2JZ bottom end?
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: 1.5JZ
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Tue, 02 March 2004 08:46
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Nope, someone above hit it on the head, it's for retaining all the bolt-on 1JZ head stuff you've accquired when you need a new engine, gaining 0.5l is just a bonus.
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Location:
Brisbane
Registered:
May 2002
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Re: 1.5JZ
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Tue, 02 March 2004 22:49
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| n2734222 wrote on Tue, 02 March 2004 16:59 |
I thought the point of a 1.5JZ was to put the later model 1JZ vvt-i head (which apparently flows better due to improved head design) and throw that onto the 2JZ bottom end?
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Someone didn't bother reading the thread before throwing his own two cents in. 
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