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Registered:
September 2002
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 JZA80 engine conversion options
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Thu, 12 September 2002 15:12
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i am planning for my next project car - a JZA80 Supra.
Can anybody please recommend one of the the best options below:
1) 1JZGTE head & block (with VVTi and single turbo)
2) 2JZGE head & block with aftermarket turbo
3) 2JZGTE head on 2JZGE block with aftermarket turbo
4) 1JZGTE head on 2JZGE block (with VVTi & single turbo)
5) 1JZGTE head on 2JZGE block (non-VVTi & twinturbo)
Cost is my primary concern hence I have a budget of $10K.
Out of the options above, which is a more realistic and practical option? Any advice is much appreciated!
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Location:
Forrestfield, WA
Registered:
August 2002
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Re: JZA80 engine conversion options
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Thu, 12 September 2002 15:19
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Dude if youve got 10k... go for either 1 or 2.
Id say 1 would be a good option cos obviously a 1JZ with VVTi and the CT26 would have to be a pretty recent engine (98 onwards).
On the other hard the 2JZ has the most power potention... .. either way JZ engines are king 
I wouldnt go mixing turbo heads with non turbo blocks, just asking for more toruble and work..
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: JZA80 engine conversion options
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Thu, 12 September 2002 20:25
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What's wrong with a 2JZGTE?
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Registered:
June 2002
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Re: JZA80 engine conversion options
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Thu, 12 September 2002 21:44
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"What's wrong with a 2JZGTE?"
I thought that would be the obvious choice!!
Now that the head/block combo's have been brought up, what are peoples thoughts.
Both 1jzgte heads have butt ugly exhaust ports, are the 2JZGE
heads better?? I've seen a pic of their factory extractors and it looks like the ports exit straight out, would this head be better to use for a big single application as apposed to a TT 1jz head??
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Registered:
September 2002
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Location:
Brisbane
Registered:
May 2002
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Re: JZA80 engine conversion options
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Thu, 12 September 2002 23:23
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Let me get this straight. You want to buy a JZA80 Supra, which comes with a 2JZ-GTE from the factory, and then you want to build some weird-arse hybrid engine out of various 1JZ's and 2JZ's to slot into the engine bay?
Seriously dude, that's one of the most ass-backwards concepts I've heard in a while! Buy a TT Supra and spend the money on the existing 2JZ-GTE, you'll be way ahead.
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Location:
Forrestfield, WA
Registered:
August 2002
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Re: JZA80 engine conversion options
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Fri, 13 September 2002 00:10
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haha i didnt read him properly the first time... i thought you were just buying the ENGINE to go in another car...
Dude if your getting a TT Supra Mark IV.... and its manual.... why on EARTH would you want to get rid of those engines.. you can get over 600hp out of them at LEAST on stock internals...
JZ engines are king!
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Registered:
June 2002
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Re: JZA80 engine conversion options
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Fri, 13 September 2002 00:11
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I'm guessing it must be a N/A 2JZ-GE for him wanting to do some kind of mongrel engine to get more go.
If it's going to end up being a bitza then why dont you put a modded 3S-GTE in it?? Japanese GT300 style. I'm sure for 10k you'd have a pretty unique ride.
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I supported Toymods
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I renounced punctuation
Registered:
May 2002
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Registered:
September 2002
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Re: JZA80 engine conversion options
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Fri, 13 September 2002 10:19
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Yes, I have a JZA80 Supra with a 2JZGE 6spd manual ('97 SZ-R )
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If it's going to end up being a bitza then why dont you put a modded 3S-GTE in it?? Japanese GT300 style. I'm sure for 10k you'd have a pretty unique ride.
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If i were to do a 3SGTE conversion, I'd have to spend nearly twice the budget in order to modify the 3SGTE engine just to make up for the power that I need. Afterall, if i were to use a 3SGTE, i might as well stick to my current engine since the power rating is nearly similar anyway... i understand that the 3SGTE is lighter, but i doubt it'll give any significant improvement or difference on the road.
the reason why i'm contemplating a hybrid conversion (1JZ head + 2JZ block) is mainly for more torque and just to be that little bit more unique... As I am very determined for a 1JZ VVTi turbo anyway, headflow is not going to be too much of a deterrent.
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Location:
Sydney
Registered:
May 2002
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Re: JZA80 engine conversion options
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Fri, 13 September 2002 11:25
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drive a twinturbo 6 speed supra around and then decide if you wanna make it faster if you want a mongral engine you need to decide what you want from it first!!! is it for dags or what...jap toyota mongral engines are put together on purpose not just for fun
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I supported Toymods
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I renounced punctuation
Registered:
May 2002
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Re: JZA80 engine conversion options
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Fri, 13 September 2002 11:30
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| omytjz wrote on Fri, 13 September 2002 20:19 |
Yes, I have a JZA80 Supra with a 2JZGE 6spd manual ('97 SZ-R )
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On second thoughts, keep that. 
If you must have VVTi, why not a 98+ 2JZGE head - they have VVTi on the exhaust cam and fabricate a custom single turbo install from there on? Sourcing the GE VVTi head might be a bit tricky, but the parts are readily available via Toyota. Probably a bit exxy.
Are you in Australia?
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Registered:
September 2002
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Re: JZA80 engine conversion options
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Fri, 13 September 2002 15:07
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Yes, I am from Oz (Melbourne)
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drive a twinturbo 6 speed supra around and then decide if you wanna make it faster...
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My cousin owns a '95 6-spd twinturbo, and yes I have driven it. I was so impressed with the turbo rush, I decided to include one under my bonnet also, but the 2JZGTE conversion is waaaaay out of my budget. That is when I started looking for alternatives (taking cost and ease of conversion into account).
The 1JZGTE conversion is purely for street use as my daily driver. Having said that, I'm hoping to achieve up to 500hp as I save up....
I've heard some horror stories from the 'States about turbocharging the 2JZGE engine, therefore I'm not gonna take chances with this one... At least I'm sure the conversion will have a proven benefit (...and I like the look of the 1JZGTE VVTi as well, heheheh).
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I supported Toymods
Location:
Brisbane, QLD
Registered:
May 2002
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Re: JZA80 engine conversion options
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Fri, 13 September 2002 16:20
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On the topic of VVT-i (GT, i am just saying... promise , there are couple of things that I've "noticed" (on the 2JZ-GTE though... probably should apply to 1JZ as well).
Firstly, the main difference in the VVT-i and non VVT-i version is not the cylinder head, but the intake cam and the timing sprocket (the VVT-i timing sprocket is actually a hydrualing actuator that changes the cam position relative to the gear for 0 - 60 degree adjustment in the intake cam duration. Yes, much simpler than the Ferrari 3-d cam profile based variable valve lift and timing which moves the camshaft horizontally to achieve the variation).
So for a VVT-i conversion of a non VVT-i head, you'll need:
The VVT-i intake camshaft.
VVT-i timing sprocket actautor (and the connecting bolt etc.)
Plus you will need the VVT-i version of the ECU.
However, things might get complicated with the VVT-i ECU because the connectors and the loom might be different (as the VVT-i ECU in Supras don't have an additional ECTS computer which it works with). There are fuel rail/injector(?) and coil pack differences as well (on the 2JZ-GTE) between the VVT-i and the non VVT-i version. So you might need some work to adapt the existing stuff to the new ECU or get the VVT-i engine versions of whatever that needs changing.
So it's a bit of work
But having 440Nm@2400 as opposed to 4200 kinda kicks ass (maybe?). As for if it's worth the trouble, you decide
Yeah, and VVT-i appeared in 97/09 and onwards (depending on the model).
Hope this helps.
Cheers
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Registered:
September 2002
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Re: JZA80 engine conversion options
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Fri, 13 September 2002 16:54
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wow.... that does sound like a lot of work...
maybe i oughtta stick with a complete Soarer/Chaser front-cut for the 1JZGTE VVTi then eh?
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I supported Toymods
Location:
Brisbane, QLD
Registered:
May 2002
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Re: JZA80 engine conversion options
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Fri, 13 September 2002 17:00
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I'd think that'd be a much better option. They are a bit rare, but are around. Last time I checked, a jap import place had two of them (both already had deposits on em and according to the wrecker, and had a 4000 price tag). I was told that it was heaps easier to get em in auto front cuts than manual and since you already got a getrag 6spd i dont think that'd be an issue. Drop me a message when you a VVT-i front cut 'cause it'd be interesting to note down what *exactly* the differences are in terms of fuel/ignition/loom/ecu connectors etc.
Cheers and good luck
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Location:
Newcastle
Registered:
May 2002
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Re: JZA80 engine conversion options
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Fri, 13 September 2002 17:23
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Why not put a full sik holden 202 head on a RB26DETT and triple webers with VTEC? It would fly then....
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: JZA80 engine conversion options
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Sat, 14 September 2002 03:21
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| zorro wrote on Sat, 14 September 2002 03:23 |
Why not put a full sik holden 202 head on a RB26DETT and triple webers with VTEC? It would fly then....
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I don't think the oil galleries line up.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: JZA80 engine conversion options
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Sat, 14 September 2002 12:34
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I didn't know a 202 head had enough moving parts to actually warrant any oil galleries
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Location:
Adelaide
Registered:
July 2002
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Re: JZA80 engine conversion options
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Sat, 14 September 2002 17:07
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Please excuse my ignorance.
But why can't he just have a turbo manifold made up and slap a turbo (or two) onto the current 2jz? Or is that like saying put the 4agze head onto the 4ac block. Sorry im a Rolla Boy 
Cheers
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Location:
Brisbane
Registered:
May 2002
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Re: JZA80 engine conversion options
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Sat, 14 September 2002 23:49
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The 2JZ-GE is fairly high compression so you won't be able to boost it much. From memory the injectors are a pissweak 340cc or something so it won't take long before you reach the limits of the fuel system.
Also you need to consider that a custom manifold and new turbo is going to set you back $4-5k (not including intercooler, plumbing, engine management mods etc), while I paid $3k for a complete 2JZ-GTE front cut! Hardly seems worthwhile does it?
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