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Xistant
10-01-2006, 05:01 PM
Idiots guide to a 1jz conversion into a MA70 bodied supra.


Ok,
I’m sick of people asking constantly how to do this Conversion
Well now you won’t have an excuse after I have finished the complete A to Z
Everything and anything you wanted to know will be advised either written or Visible.
Now to start of stripped the whole front of your car,
Take the front bar, front quarter guards, top lip and bonnet,
Why you ask?
Easy I know for a FACT you will drop a tool or when removing/inserting the engine you will error and damage something. (It will happen!!)

Once your car looks like a skeleton, remove your re’o bar (reinforcement bar) now everything in the engine bay will not bee required,
Now before you start on removing the engine, get inside your car and remove your seats, this creates more space inside the car for moving/removing parts.

Now you probly have removed your middle console a few times, so get going and remove it, also take away your center console and remove, now to start removing your dash (yes your dash!) above your instrument cluster is a black plastic cover, has about 6-8 Phillips head screw in the top, and one over near where your a/c module is & another under neath where your fog light switch & coin slot is (this is very easy to remove it simply needs a little force and pulls out)

Now that the black cover has been removed, there should be 4 screws holding the top of your cluster in, and 3-4 along the bottom, please be careful once u have removed all screws and try not to forcibly remove the cluster… there are 3 plugs Plus your Speedo pin, you will need to reach behind and unplug.
Once instrument cluster has been removed we will go over to the passenger side to remove the glove box,

To remove the glove box is bloody easy,
Now because u have removed the seats, you can lye on your back and remove the 4 screws along the bottom of your glove box, 2 are 10mm bolts and 2 are Phillips head screws,
Once removed a black metal rail will fall, now slowly lower your glove box and with some angle you should be able to completely remove the glove box,

Once those to items are complete you can remove you’re a/c module & radio (doesn’t have to be done now, but when you want too) now on the drivers side kick panel where you look for blown fuses, in bedded into the carpet is I think either a 12mm or 10mm bolt, remove and the whole kick panel mould can be removed,

For passenger side do the same as driver’s side. (Der)

To remove the steering wheel and column, you must remove the plastic cover from under near, screw on each side and a simple tug will remove the cover, remove aircon ducting also. Now while lying on your back (might be a good investment to purchase a climbers headlamp/light) there are 2 12mm bolts on each side on a gold-ish coloured plate, once removed, move upwards to wards your steering wheel and u’ll find 2 17mm bolts remove theses bastards will take some elbow grease!!
Now there is an electronic connection down towards your pedals its black in colour, and looks similar to a trailer connector (the flat rectangular styled ones) disconnect,
Remove steeling column.

Now that your interior looks shagged and horrible (and it will) please refer to photo below for how to remove your DASH! Now a warning is to be careful, as it will need some pulling force to remove this huge piece of plastic crapo!

http://www.thefreeimagehosting.com/Uploads/Images/Thumbs/557471875006IMAG0020.JPG (http://www.thefreeimagehosting.com/Uploads/Images/557471875006IMAG0020.JPG)http://www.thefreeimagehosting.com/Uploads/Images/Thumbs/557534375007IMAG0019.JPG (http://www.thefreeimagehosting.com/Uploads/Images/557534375007IMAG0019.JPG)
http://www.thefreeimagehosting.com/Uploads/Images/Thumbs/557600000008IMAG0021.JPG (http://www.thefreeimagehosting.com/Uploads/Images/557600000008IMAG0021.JPG)http://www.thefreeimagehosting.com/Uploads/Images/Thumbs/557656250009IMAG0022.JPG (http://www.thefreeimagehosting.com/Uploads/Images/557656250009IMAG0022.JPG)

Now once you have removed your dash, there is a reinforcement bar this doesn’t need to be removed, unless the half cut has a much prettier looking one, it doesn’t need removal.

*To be continued tomorrow(11/01/06) @ 20mins to 5pm *



Before I get going into the next write up, photos will be inserted as soon as I find the cd of the 300 or so photos I took while deconstructing the supra.

Now we’ll leave the interior till I find the photos so you can see what I am talking about regarding the removal of the body loom, So in saying that we’ll get our mitts dirty and get into removing the 7MGE, now obviously u’ll need a engine crane, general tools (ie, spanners, sockets, screw drivers)

Starting on the drivers side, remove the Air box by unscrewing the 3, 10mm bolts, remove the rubber tubing between your intake manifold and the air box, underneath you'll see the oxy sensor connector, unplug it just so you don’t snap this. Cos obviously you want to sell the engine complete now don’t ya!

http://www.thefreeimagehosting.com/Uploads/Images/Thumbs/5577250000010IMAG0029.JPG (http://www.thefreeimagehosting.com/Uploads/Images/5577250000010IMAG0029.JPG)http://www.thefreeimagehosting.com/Uploads/Images/Thumbs/5577875000011IMAG0031.JPG (http://www.thefreeimagehosting.com/Uploads/Images/5577875000011IMAG0031.JPG)

Now… we’ll more onto the front of the engine where you guessed it your radiator is, now please drain your radiator prior to doing anything further, just to save you some time waiting for everything to dry up, and being caked in water, drain plug is under
Total of 2 bolts one on each end.
After removing the bolts, remove the brackets from the top of the radiator, remove top radiator piping also, under neath remove the bottom radiator pipe which is located on the drivers side, once all this is complete, slowly remove the radiator on a upward lift, be careful and try not to crush the fins on the clutch fan!

Now we’ll move onto the passenger side of the bay the following will need removal,
Aircon lines, power steering lines, I’ll post up some pictures regarding theses 2 removals as I just can’t think right now I will do a write up shortly over I look at my engine bay.

Once the above have all been done its time to move under the middle of the car to remove the 2 14mm bolts from the cat back exhaust, this all will come out in one go with the transmission & clears the firewall with ease, but be careful as the engine can / will swing on the engine crane.
Now back to the exhaust where the cat is, your best bet is to use 2 14mm ring’d spanners due to a socket won’t fit, once this has been removed from the cat, leave it along, it can be reused to the dump from the 1jz (save money on buying a new exhaust).
Now since you’re under the middle of the car, lets get the drive shaft out of the transmission! In the middle of your drive shaft line there is a joint between the two shafts, 2 14mm bolts either side once removed you can drop and pull the yoke out of the shaft of the a340e (trannie).

Removal of the engine mounts is quite a easy job but, you’ll need some considerable force to remove your engine mount nuts, there is a hole under each bottom wishbone link, the engine mounts are 19mm nuts one on either side of course, once removed we can now remove the transmission from the firewall.

*To be continued tomorrow 12/1/06 kiddos *

Now we’ll remove the transmission mounts, but before we start grab your jack and place under the rear of your a340e (trannie) jack up just enough to hold the trannie up,

Now the engine should be ready for removal! Now be careful not to rock the engine around too much, as you’re picking up a fully accessorized engine Inc a transmission and exhaust! (Basically around the 500kg mark) while you’re hoisting up your engine, check around the engine every few lifts for any wires, plumbing that could be missed and still connected,

By now the engine should be out Inc trannie, now comes the fun part removing the Cross member!! Now there are only 4 bolts in the middle of the Xmember (near where you removed your engine mount nuts) and 2 nuts towards the rear of the Xmember, WARNING please be very careful when removing the cross-member! as a safety measure place stands under the member itself, and don’t disconnect the suspension just yet (remove the brake lines from the chassis)
Regarding the 4 bolts, you'll need to be either Mr buff or grab a long pole for a lever to break the torque that are on theses bastards, the 2 rear bolts are still torque’d but not to the point as the 4 front.
Now that all the bolts are out remove the stands and place something mildly soft under your disc brakes (saves chipping or cracking them) remove the suspension from the chassis and drag the cross member out.

Now after you finish your beer thinking the hard part is over (hahahaahahah!) wrong.
The wiring is a pain in the arse to remove; all I can suggest is to be patient regarding the removal inside the firewall (wiring is quite thick when we get to pulling it through)
We’ll start over inside the car, passenger side, you’ll see a lot on relays plugs etc, best thing is to removal all plugs like a crazy animal, doesn’t matter what order you remove them from because when we start to remove the jza70 loom we’ll label from that.

Now there are 2 nuts on the bottom of the wiring holders (what I call them) we’ll refer to picture for this, they are gold in colour 10mm nuts once theses are removed leave em and move onto the next, now there is a plug underneath your blower box (refer to picture)

http://www.thefreeimagehosting.com/Uploads/Images/Thumbs/557600000008IMAG0021.JPG (http://www.thefreeimagehosting.com/Uploads/Images/557600000008IMAG0021.JPG)http://www.thefreeimagehosting.com/Uploads/Images/Thumbs/557656250009IMAG0022.JPG (http://www.thefreeimagehosting.com/Uploads/Images/557656250009IMAG0022.JPG)


To remove the air-con box there are 3 gold nuts up top and 3 on the bottom, removal of theses and a slight tug and the box should be ready for removal, but take it easy as your aircon pipes are connect to this and need patience to come through the firewall,

Now your asking why we need to remove the aircon or heat core etc. etc. why because clean the bastard inside and out, get rid of the birds nest that has been growing inside for the past 18yrs! Plus makes life a lot easier to removal/ installation of the loom,

A lot of your wiring are connect either to your firewall by a black clip or those nasty
è Ones, (I’ll get the photos up soon I promise) work your way over to the drivers side where you’ll find yourself in the same boat as the passenger side, lots of relays, and 2 door plugs, a rear loom plug, a resistor and a few modules, disconnect the lot (I also forgot to tell you your window wiper module is on the passenger side) now that your loom is detached from the firewall (refer to below picture) move back into the engine bay.

<Insert picture here>

* To be continued tomorrow @ 20mins to 5pm 13/1/6 *

Rattlehead
10-01-2006, 09:59 PM
Good start Casey - look forward to reading the rest.

hamgatan
10-01-2006, 10:01 PM
aye...as am i! i was about to say though... picsorban till i saw the <insert pic here> tags :)

urantia
10-01-2006, 10:59 PM
eagerly awaits the idiots guide to wiring. (15 rep points for you if you happen to know the wiring to my rare as hens teeth body loom plugs)

EldarO
10-01-2006, 11:41 PM
ummmm search?

http://www.toymods.net/forums/showthread.php?t=64

Eldar.O.

urantia
10-01-2006, 11:47 PM
My supra has different body loom plugs to both the pre and post 89 ma70s. Not only are the plugs different (as in pin count and size) but the wire colors are also different. So to work out functions requires tracing out the wires and figuring out it's function.

Have almost everything sorted out now, except for the PPS, AC and a few little ones like oil pressure for the digital dash.

sideshow
10-01-2006, 11:48 PM
the wiring is piss easy
im always reading on the net that its only 5 wires to wire up an engine

1 wire every 5 minutes the job can be finished in under half an hour

hehehe

another thing u might run into is the tacho will not work without a tacho booster

unless u fit the tacho thats in the front cut

i have to fit them on 99% of 1js that i do

urantia
10-01-2006, 11:50 PM
thats realy funny sideshow har har real easy.

with diagrams its easy. :rolleyes:

urantia
10-01-2006, 11:57 PM
interesting sideshow, no probs with my tacho wiring then, but my friend sounds like he needs one for his aw11 with beams, i think it's getting about a quarter of the signal. You wouldn't believe the amount of auto elecs he's gone to, to have this fixed lots of $$ later and it's still the same.

sideshow
10-01-2006, 11:57 PM
what im tryin to say is its not easy it still takes me 5 to 8 hours to do a job

but once im finished everything usually works unless theres a prob like its a one off car with no instructions and stuff

but i always try to finish everything

and then u get some people say its a 5 minute job

this is y i dont give anyhting out even for 1000 bucks i wouldnt give anything out

sideshow
11-01-2006, 12:00 AM
1/4 of the revs

where the fuk did they connect the rpm signal
straight to one coil (if the beams has 4 coils)
this is why its a 1/4 revs

i have a device that can read of all 4 coils then add it together

or just run it of the ig- wire
if this doesnt work u might need a booster

i have shitloads of boosters

urantia
11-01-2006, 12:05 AM
yep i can understand that, i think it's taken me 2 weeks to get my car wired up to where it is without diagrams for the my ma70 body. But i'v got the main stuff done, engine essential wiring done, and most of digidash functional.

Yeah that sounds about right re: the tacho i cannot remember if he said his tacho was just jumping around eradically or if the revs were about a quarter of what they should be. By the sound of it either it's a complety different signal going to it making it jump around erradically, or connected to a single coil. I'll forward him your e-mail address.

hamgatan
11-01-2006, 01:11 AM
another thing u might run into is the tacho will not work without a tacho booster

unless u fit the tacho thats in the front cut

i have to fit them on 99% of 1js that i do

or to save some of the hassle i have a spare JZA70 digital dash lying around if anyone wants it for 60 bucks + post... :)

Xistant
11-01-2006, 09:04 AM
ok guys please realise,
that there will be alot of wright ups, wiring diagrams, photos with focused parts circled,
if you just cut ur own 7m** loom and wanted to rewiring your 1jz into it, this can help you abit, not not fully!!

as this is for FUTURE pardons that wish to make a journey into the jza series,

all i can ask is be patient and watch for my updates.

thank you

Xistant
11-01-2006, 04:56 PM
updated :)

ndgcpr
11-01-2006, 08:35 PM
Just to fill you in, my supra has different body loom plugs to both the pre and post 89 ma70s. Not only are the plugs different (as in pin count and size) but the wire colors are also different. So to work out functions requires tracing out the wires and figuring out it's function.

Heya buddy i also had alot of trouble in my Gz10. do they look like this as i had to trace most of mine. SO i have them, if you can't find the yellow/green water temp wire mine was blue. Check the wire with a multimeter and mine read 5V with no load then as you added resistors to drop the voltage the digi gauge reads higher.

urantia
12-01-2006, 09:27 AM
ndgcpr, yeah i'd say that's the b1 plug in your pic, yeah mine is like that, altho it takes 3 big wires with the addition of 3 more wires along the top, and yeah i do believe when i traced the water temp on the old engine it ended up in that plug and it was a light BLUE wire aswell!!

So you may possible have the same body loom plugs.

One thing i found out from my ECU computer part number was it was used in supra's and soarers between a narrow time period which may relate to the plugs they used in that short time.

ndgcpr
12-01-2006, 12:09 PM
well this is mine from my z10 plug. this is pratically the only plug i had for the car, although one of the ECU plugs was part of the car loom not the engine loom (so i wired the speed sonsor, Main relay, COR and engine light off that plug).

Hope it helps

EDIT: this is the MALE end of it

urantia
12-01-2006, 02:50 PM
Well pretty well all those functions are the same as my identifiable b1 plug, but less pins by the looks of it.

I'd be curious as to what your body loom plug looks like that carries all the dash informatoin etc

Xistant
12-01-2006, 05:21 PM
updated again :) pictures tomorrow (sorry about the lack of no photos)

rattlehead u might find some photos funny, considering the room i had lol!

ndgcpr
12-01-2006, 06:28 PM
Well pretty well all those functions are the same as my identifiable b1 plug, but less pins by the looks of it.

I'd be curious as to what your body loom plug looks like that carries all the dash informatoin etc

That is most of the dash info there, my tacho that needed a booster was wired in the actual engine bay, my speedo is mechanical. the only other plug i have at the ecu that is part of the car is that plug i showed and the 24 pin ECU plug, that was all there is. everything else was wired in the engine bay, my car is pretty much running with both the old and new looms in use.

Rattlehead
14-01-2006, 08:52 PM
updated again :) pictures tomorrow (sorry about the lack of no photos)

rattlehead u might find some photos funny, considering the room i had lol!

Hey Casey...I KNOW!!!
I don't think u could tell exactly how shocked and suprised I was when I saw your 'workshop' and how on earth you managed to get all this done.

Xistant
14-01-2006, 09:06 PM
heheeh rattle, when theres a will theres a way,

and i guess i found it :P

anyways i'll post up more photos tomorrow (sunday) and some more writing :)

found the photos about 30mins ago,

oh theres a video too :)

urantia
17-01-2006, 10:58 AM
come on 2DRFT, waiting for the next installment don't get lazy. :P

If you need me to host anything let me know. (pics video etc)

Xistant
17-01-2006, 11:10 AM
might actually need you to host some photos for me,
haven't been lazy, just been typing it up in word instead so you can downloadit all and save the space...

pm ur msn or something

urantia
17-01-2006, 11:44 AM
nah i was kidding your not lazing out.

I added u to my MSN awhile ago you never seem to be on, might have you confused with someone else. Anyway my msn is: cjdoolan@yahoo.com.au

or e-mail what you want hosted and i'll send you the links to them. (e-mail urantiacjd@iinet.net.au)

Xistant
17-01-2006, 11:47 AM
nah i was kidding your not lazing out.

I added u to my MSN awhile ago you never seem to be on, might have you confused with someone else. Anyway my msn is: cjdoolan@yahoo.com.au

or e-mail what you want hosted and i'll send you the links to them. (e-mail urantiacjd@iinet.net.au)

im online now, just added you, just send me a msg on msn, cos i can't find you lol:(

urantia
17-01-2006, 12:34 PM
Ah dam @ work, no MSN. send me an e-mail, or i'll get on MSN as soon as i get home.

Xistant
18-01-2006, 06:48 PM
ok ive added some photos but i think i will have to write this up in a pdf format, inc photos as theres no way i could fit 300+ photos in here, and i couldn't be fubared making 30posts lol!!!

anyhow check theses photos out, and giev me a couple of days or so to write this up in my spare time.


regards,
Kc

Xistant
02-02-2006, 02:38 PM
Ah dam @ work, no MSN. send me an e-mail, or i'll get on MSN as soon as i get home.

Urantia, i believe you were looking for pinouts???

here is the complete 7m and 7MGTE supra pinouts plus extras, u'll find the wiring for the JZA70 from the soarer bible... search on here or ask around majority of people have it,


http://www.cygnusx1.net/supra/library/TSRM/


regards,
Kc

urantia
02-02-2006, 02:50 PM
Thanx 2DRFT, but not the same, even the 87 supra diagrams are not the same even tho i have an 87 (according to the plate on the firewall).
(cygnus tsrm covers 1990 supra's and i think they have a small portion of 87 wiring)

But i've mostly got everything that i need wired up. The main plug B1(yellow square plug on my MA70) is simular except for a few wire colors and pin functions such as the water temp sensor wire going into this plug. And the plug that carries dash info is completly different, wire colors are different, and pin functions are different, a few wire colors match up across diagrams for this plug, but as i've found out i can't rely on wire colors either as some had completly different functions such as the pink speed sender wire, and the Check engine light was green/red on my ma70 body plug and green gray on the 1jz end.

My only issues (wich could be wiring, or more likely mechanical are the temp guage overheats and climbs off the scale after boosting, yet when you inspect the engine it seems ok. Also lacking abit of power compared to the first day i had it up and running as if the ECU is holding me back due to something like weak fuel pressure/flow or something else. (after learning conditions etc).

Also yet to wire my PPS and hydro fan in properly it appears they both wire into the same Relay. I'm having problems working out the wiring with this relay it has 4 wires going to it, and i have traced the PPS and Hydo computers which both have 1 wire each to this relay, but what the other 2 are for i'm not sure as yet.

Xistant
02-02-2006, 03:00 PM
oh never mind that,

here it is
the complete info you'll need is below

http://www.1jz-gte.us/92Supra6.html

regards,
Kc

urantia
02-02-2006, 03:26 PM
The fella that runs that site rick doesn't know why my plugs are different either. Trust me i've trawled everywhere, even supra girl who has an 87 manual with wiring diagrams is different to mine.
maybe toyota ran out of plugs and wire colors on the day my car was built and used some slightly different ones :P or maybe an auto electrician has had his way with my car in the past. Who knows, but it's different.

Thanx for helping me tho.

wiso
28-06-2006, 11:18 PM
A lot of your wiring are connect either to your firewall by a black clip or those nasty
è Ones, (I’ll get the photos up soon I promise) work your way over to the drivers side where you’ll find yourself in the same boat as the passenger side, lots of relays, and 2 door plugs, a rear loom plug, a resistor and a few modules, disconnect the lot (I also forgot to tell you your window wiper module is on the passenger side) now that your loom is detached from the firewall (refer to below picture) move back into the engine bay.

<Insert picture here>

* To be continued tomorrow @ 20mins to 5pm 13/1/6 *

dude this seemed to end abit abruptly.

i am now up to this phase of wiring the car while everything is still out so i can see what i am doing.

but i am a little stumped, hoping you can offer some advise.

i did the same thing you did, took the whole wiring loom out of the halfcut and put it in mine, dash loom and front loom, this will al connect to the engine so it should work fine.

however where the body loom meets at the fuse box in the drivers footwell, there are 3 plugs, that all, 3 plugs. just wondering how you went about redoing these plugs so the MA loom meets the new JZA loom/fusebox.

i was looking at where they go, and it looks like most i can simply change the pins to the new plug, but there are other wires in the jza plugs that mine do not have, did you find this?

i know you mentioned you have to rewire the door plugs, but i have already done this, all i need is the rear body loom

Xistant
29-06-2006, 12:10 PM
^^ atm im still wrighting up this section, kinda hard when you busy with other stuff

your body loom the colour coding is the same, so jsut splice the wires with your ma70 loom and jza70 plug, and you should be ok.

Whiplash
02-07-2006, 11:18 PM
um anyone done a jzz30 1jz into a ma70 before. cos i have almost finished and yet to start the wireing stage. so anyone with experiance would be nice

Danners
16-07-2006, 10:54 AM
Is the rest of this guide still coming? I'm about to convert my MZ20 to 1J and would love to read it!

Dan

Xistant
16-07-2006, 07:58 PM
its still going, but in .pdf (up to page 32) :eek: and only halfway through.

Danners
17-07-2006, 08:45 AM
Would you mind if i had a read of what you've got so far? I'm starting work on this next weekend...

Dan

Xistant
17-07-2006, 08:51 AM
just pm me what your after and i'll extract it for ya :)

Mk3Soup
10-11-2006, 02:42 AM
nice write up so far KC, hows the rest of it goin :p

pain1jz
20-03-2008, 05:08 PM
hay guys im just new at this but how can i find this finished

hecate
06-02-2009, 07:15 PM
Probably going to have to wing it.
There are *MANY* people who have done either this conversion or a JZA70 halfcut into a MZ20 (mechanically identical), so there's lots of help, and various pictures and advice on a number of threads in the buildups and such.
Going with this thread though, does anyone have xistant's pictures cached? As it'd be good to have them up, methinks.

hecate
06-02-2009, 07:16 PM
Check out this similar walkthrough buildup thread thingy (http://www.toymods.net//forums/showthread.php?t=64)