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Location:
Melbourne
Registered:
May 2002
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GA70 + 1JZGTE conversion - few questions
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Mon, 26 May 2003 07:05
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Nearly in the closing stages of finding a half cut. Still need to decide on manual or auto - but I think it might be auto, only because my car is a daily driver, and I get stuck in traffic a fair bit.
Anyway, few questions.
I have to decide whether to take my car to a normal mechanic or a performance workshop.
Normal mechanic coversion will cost around the $400 - $1000 mark. P/Workshop around $3000 - $7000.
I'm really only going to remove my 1G and putting the 1JZ in...
Also, I don't know what changes I'll need to make to the rear end. From what I've been told...I need to mod my tailshaft or get a new one, change the diff, fuel pump.
Anything else? I need to make an order of my half cut with other parts I require, so it'll be ready by August for fitting.
Thanks...
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Location:
c'town, NSW
Registered:
May 2002
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Re: GA70 + 1JZGTE conversion - few questions
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Mon, 26 May 2003 09:49
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you wont need to change the diff unless you have a single spinner and really want LSD..
you might be lucky with the tailshaft
check the part number of the fuel pump (go to toyota dealer) if it is the same as the MA71 or JZA70 then leave it in
you have a very good platform for a conversion u will find that you wont have to change much at all.
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Location:
c'town, NSW
Registered:
May 2002
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Re: GA70 + 1JZGTE conversion - few questions
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Mon, 26 May 2003 09:54
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whoops almost forgot
use the radiator from the front cut, the 1G-GE GA70 has a piss small single core piece of tin that wont even cool a 5M-E
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Location:
Melbourne
Registered:
May 2002
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Re: GA70 + 1JZGTE conversion - few questions
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Mon, 26 May 2003 10:03
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Thanks Rob - thats the best thing I've read all day!!!
Everyone else is telling me to buy a new car - whats with that??
Question still remains...will a normal mechanic be able to perform this conversion? Can't see why not...any opinions?
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Location:
berala sydney
Registered:
November 2002
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Re: GA70 + 1JZGTE conversion - few questions
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Mon, 26 May 2003 11:43
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hi
should'nt be to much prob with the conversion the normal mechanic will beable to do the job not that much involved.
cya knackers
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: GA70 + 1JZGTE conversion - few questions
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Mon, 26 May 2003 11:53
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only hassle will be the wiring.
it's probably beyong a standard mechanic to fix... you'll either have to pay someone ($$$), or do it yourself. you might be able to find someone on the forums to help you out, if you ask nicely or offer a small monetary/beer incentive.
if you've got a decent grounding in electronics, you should be able to do it yourself (f you dont, dont try it!)
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Location:
Brisbane
Registered:
May 2002
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Re: GA70 + 1JZGTE conversion - few questions
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Mon, 26 May 2003 13:55
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Any mechanic should be able to physically install the engine and transmission, it's certainly not a difficult task. Hell if a backyard hack like me can do it I'm sure it's not beyond a professional spanner-twirler! However as draven said, actually getting the thing running might be a different story - you might be better off talking to a few auto sparkies in your area. Again it's not that hard if you know what you're doing, but if you don't know what you're doing it's easy to screw it up.
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Location:
Melbourne
Registered:
May 2002
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Re: GA70 + 1JZGTE conversion - few questions
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Mon, 26 May 2003 15:02
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Okay, so the main problem will be the wiring.
So it's not as easy as pulling out certain sections and installing them?
I guess not...
So would it be wise to pull the loom apart, and get it sent to Sixworks or someone similar to sort it, and that way the mechanic can install the wiring? Or is it still better to have the mechanics get an auto electrician in just to fit the wiring?
Thanks...
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Location:
Sydney
Registered:
March 2003
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Re: GA70 + 1JZGTE conversion - few questions
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Tue, 27 May 2003 00:12
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| Norbie wrote on Mon, 26 May 2003 23:55 |
Any mechanic should be able to physically install the engine and transmission, it's certainly not a difficult task. Hell if a backyard hack like me can do it I'm sure it's not beyond a professional spanner-twirler! However as draven said, actually getting the thing running might be a different story - you might be better off talking to a few auto sparkies in your area. Again it's not that hard if you know what you're doing, but if you don't know what you're doing it's easy to screw it up.
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Hey! I had NFI what I was doing and I got my shitbox running 
Seriously, going from a GA70 to a JZA70, IF you have a complete front cut, it will be a piece of cake. All you need is a bit of competance and can turn a spanner, you could have the swap done in a couple of days pending the tailshaft.
You will probably have to swap over the crossmembers too
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Location:
Melbourne
Registered:
May 2002
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Re: GA70 + 1JZGTE conversion - few questions
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Sun, 01 June 2003 06:00
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Another question...I'll need an LSD diff...can someone pelase tell me the size and ratio and whatever else I need to know??
Thanks... I'm going to place my order tomorrow, so if theres any last minute parts I'll need from an importer ... help me out!!
Appreciate it all...it's finally gonna happen *touches wood*
(I've always had bad luck when it comes to wanting to do something)
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Location:
c'town, NSW
Registered:
May 2002
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Re: GA70 + 1JZGTE conversion - few questions
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Sun, 01 June 2003 22:15
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you will NOT NEED and LSD diff but it is preferable...
so if u dont have money for the diff put it on the low priority list cause u can live with a single spinner to get the car on the road if u have budget or time constraints... if u can afford it then by all means upgrade...
check your build plate in the engine bay it should have a trans axle code that looks like G305....
thats a supra G series diff which u should have... check your code and then go here to find the ratio etc
url will be in next post.......
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Location:
c'town, NSW
Registered:
May 2002
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Location:
Melbourne
Registered:
May 2002
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Re: GA70 + 1JZGTE conversion - few questions
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Mon, 02 June 2003 14:13
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Thanks Rob! You've been really helpful
Okay, well, the code is G252
So by going by the site..
It's an 8" 4.556 2 pinion non LS diff I got. Right?
So ... does that mean I need to get myself an 8" LSD diff?
I got told that the power of a 1JZ will be too powerful for my diff and it'll blow and I'd be spinning all the time...
hehehe, wish I knew more. But yeh...I guess if I dont need it right away, then it can wait.
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: GA70 + 1JZGTE conversion - few questions
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Mon, 02 June 2003 19:48
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it depends how you treat it!
if you just want to get your caron the road, and you think you can resist the urge to use the 1jz's potential, then your diff will be fine.
but if your foot gets anywhere near the floor, expect to tear up 1st, 2nd and 3rd with ease
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Location:
Brisbane
Registered:
May 2002
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Re: GA70 + 1JZGTE conversion - few questions
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Mon, 02 June 2003 23:20
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The diff you have will handle the power, ie it won't just "blow up" provided you don't abuse it of course. Having said that, you'll have big problems getting your power to the ground without an LSD centre, so it would be a good idea to chuck an LSD in if you can afford it.
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Location:
Melbourne
Registered:
May 2002
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Re: GA70 + 1JZGTE conversion - few questions
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Tue, 03 June 2003 05:21
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lol - u guys are great.
Thanks for all the info.
Now I just to wait for a JZA70 half cut to come around.
John from Rolin has told me that they dont take holding deposits...but will let me know if they get one.
So hopefully all goes to plan and they find me one and let me know about it.
Otherwise I'll just have to get it from somewhere else.
I think I got all the info I need. Thanks!!
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Location:
Melbourne
Registered:
May 2002
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Re: GA70 + 1JZGTE conversion - few questions
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Sat, 07 June 2003 14:46
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Back form the dead again...prolly the last time.
Quick question - Do I need to remove the whole dash to get the 1JZ wiring in my car??
Just this pic has gotten me really worried.
I'm going to see the mechanic I'm planning to get my conversion done from on Monday and will pretty much print out this website and the pictures to see if he's confident enough he can do it still.
http://www.supras.nl/view.php?page=1jzswapmarcel.h tm
I know he can ignore the wiring lengthening process...everything seems straight forward cept for the part to get the 1JZ dash connectors installed in the car. I would prefer to use the dash that comes with the half cut (esp if its digital) ... so would the whole dash need to be removed? Or does it need to be removed anyway to get the ECU and wiring in there? With the glovebox removed is there enough room to remove old ECU/fit new ECU and run the wiring etc etc???
Another question...how much difficult/easier would this swap be compared to a swap in a Commodore, Falcon, Magna??? He says he's done numerous swaps on those kinds of cars...electrics and all. So I guess that might be as far as he's gone in terms of engine conversions. Dunno what engines...but would it be similar?
Also, I know Grant (Sixworks) does something with the wiring. How can his service help me? From my understanding, he sorts wiring so that everything is plug n play. Does that mean that he will sort the wiring so that the 1JZ wiring is connected to the existing wiring in my car so that I use the same dash already in there? Or does he simply sort the wiring so that everything is loomed up and labelled so that an installer will know where to run each section?
Please help me understand wiring a bit more...because this is as far as I understand it.
1. Wiring from engine bay etc goes to ECU
2. Other wires go to the dash, instrument cluster.
lol...not very far. I'm also confused about other wiring, because theres wiring around the fuse box at the foot area of the drivers side. Now I've been told that this is not required to be changed. However, a few things seem to go through this fuse box ... Is this wiring separate to the wiring of the engine to the ECU? I take it the wiring and electrics that go through this fuse box are accessories? like lighting, head unit? Therefore the wiring removed from my engine bay will be the ones attached to the engine? Things like wiring that go to my headlights will be left alone...right??
Thanks heaps guys - I know thats a lot of questions, but I dont want to get ripped off. Or be left with a non running car with a lot of mess I have to sort out.
[Updated on: Sat, 07 June 2003 15:14]
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Location:
Brisbane
Registered:
January 2003
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Location:
Adelaide, SA
Registered:
May 2002
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Getting traction is the largest issue !!