X73 Conversion Information

by forgottenzone Fri Sep 27, 2013 3:26 pm

4 years of serching the web and tons of forums I collected a lot of information.
Here is some I found, that might help you X73 guys:

ENGINES

6MGE
bolts up, wires up, no effort required
worthy if you can get one cheap.
Difficulty 1/10
Worth it? extra 20hp, 20 Nm torque, once again, price dependent (This is over the 5MGE, not the 5ME)

7MGE
bolts up, needs 7MGE loom, ecu and be 'spliced' into MX73
may be able to use 5MGE harness and sensors, but wouldn’t get full effect.
may need small exhaust change to suit MX73 system
Difficulty 3/10
Worth it? extra 30hp, 30 Nm torque, price dependent (over the 5MGE)

7MGTE
bolts up, NEEDS 7MGTE loom, ecu, and be spliced into MX73
needs bigger exhaust and intercooler to get best benefit.
Difficulty 4/10
Worth it? yes, if you can get one for a good price

1GGTE
Bolts up with GX71/GA61 1G-EU or 1G-GEU mounts.
needs 1G gbox (or at least the bellhousing)
needs 1GGTE loom and ecu, and be spliced.
needs bigger exhaust and intercooler to get best benefit.
Difficulty 5/10
Worth it? yes, if you can get one for a good price, and you have the mounting sorted.

1JZGTE
Can use custom mounts with the stock crossmember (available in Australia, was $250AUD plus postage, not sure now) or you can use an MX83 crossmember, and factory JZX81 mounts,(late 90-92 for Australia, any MX83 for US), or you can use the factory JZX81 crossmember and mounts (ie, if you get a JZX81 front cut)
needs 1JZ gbox (or at least the bellhousing)
needs 1JZGTE loom and ecu, and be spliced.
needs bigger exhaust and intercooler to get best benefit.
Difficulty 7/10
Worth it? yes.
The Nonturbo 1JZ-GE isn't really a worthy swap for the dollars it costs, unless you can get one uber cheap.

2JZGTE
as above for 1JZGTE (same mounting), but will have clearance issues with turbo's (may not apply to LHD)
Difficulty 9/10
Worth it? yes.
The nonturbo 2JZ-GE is also definately worth a look. It will match a stock 7M-GTE any day of the week, and is capable of nice figures with some dollars thrown at it.

1UZFE
needs custom mounts (available from Peewee on the Cressida forums, $120AUD plus postage)
needs custom exhaust, and most likely manifold modifications around steering
needs 1UZFE loom and ecu, and be spliced
Difficulty 8/10
Worth it? yes.

ALL motors will need a front sump version.
ALL sumps can be interchanged within the same family (ie, if you buy a 1jz with a mid sump, you can put a 2jz front sump on it, but you need the sump (both halves), baffle plate, pickup, and dipstick/tube)
All loom problems can be sorted with going aftermarket ECU
Any motor with coilpacks (ie, not a standard coil) will need a tacho converter
Cost of installation of all motors is the same.
What varies is exhaust costs, intercooler costs, wiring costs.
Turbo motors may require a radiator upgrade.

WHAT CARS HAVE WHAT ENGINES

6MGE
Found in the MS126? Crown 3000 as a mid sump
Found in the MZ12 Soarer as a front sump.

7MGE
Found in MX83 Cressida as a front sump
Found in MS130 series Crowns as a mid sump
Found in MA70 Supras as a midrear sump
Found in MZ20 Soarers as a midrear sump

7MGTE
Found in MA70/71 Supras as a midrear sump
Found in MZ21 Soarers as a midrear sump

1GGTE
Found in GZ20 Soarers as a midrear sump
Found in GA70 Supras as a midrear sump
Found in GX81 Chasers as a front sump

1JZGTE
Found in JZA70 Supras as a midrear sump
Found in JZX81/90/100 Chasers as a front sump
Found in JZZ30 Soarers as a midrear sump

2JZGE
Found in JZA80 Supras as a midrear sump
Found in JZZ31 Soarers/SC300 as a midrear sump
Found in JZS14x Aristos/GS300s as a front sump
Found in the IS300

2JZGTE
Found in JZA80 Supras as a midrear sump
Found in JZS14x Aristos/GS300s as a front sump

1UZFE
Found in UZS131 Crowns as a mid sump
Found in UZS14x/151 Crowns/GS400 as a front sump
Found in UCF10/11/20 LS400s/Celsiors as a front sump
Found in UZZ30/31/32 Soarers/SC400 as a midrear sump

GEARBOXS

W55, W57, W58, R154, A340E, A341E, A350E Will bolt up to all of these engines.

W5x series gearbox to M series motor, will require a 5MGE or 7MGE manual bellhousing
R15x series gearbox to M series motor, will require a 7MGTE manual bellhousing
W5x series gearbox to G series motor, will require a 1GGE or 1GGTE manual bellhousing
R15x series gearbox will not bolt to G series motor (but you can get the J160 6 speed from the IS200 that bolts up)
W5x series gearbox to JZ series motor, will require a 1JZGE or 2JZGE manual bellhousing
R15x series gearbox to JZ series motor, will require a 1JZGTE manual bellhousing
W5x or R15x series gearbox to UZ series motor will require a custom bellhousing from CASTLEMAINE RODSHOP, or DELLOW AUTOS

Converting to manual will require lengthening the driveshaft, or finding a manual one from a wreck.
Using R154 or any of the auto's will require a larger spline on the driveshaft than the factory one.

W5x series gearbox will require 2nd most rear shifter position (as per MA70)
R15x series gearbox will require MA70 or JZA70 shifter position.

MX73 runs the same output shaft as the W series boxes.
The A340E (MX83 on), A341E, A350E, and R154 run a slightly larger output shaft, and will need a custom tailshaft (custom as in needs to be professionally modded).
Some of the late model autos have a weird yoke on the output of the box, but these can be changed for a normal one.
All bellhousings in the A340E, A341E, A350E range should be interchangeable with each other (you may have to swap over torque convertor too, which may require swapping over oil pump).
A340E from MX73 runs the same output shaft as the W5x and the A43DE, so you will need to swap the yoke to use it with the later A34xE range.

When mounting a gearbox in an MX73, there should be very little hassles.
Under the car, the MX73 has a row of holes where you can choose where to put crossmember.
And since the crossmember isn’t straight, you can turn it around.

DIFFERENTIALS

You can get any ratio from about 3.5 to 4.7
Look around local wreckers, look at RA65 Celica's, Crowns, Hiace's, Hilux's, and Supra's
We can use the MA61 Supra LSD centre.
Infact, the whole diff can just be swapped for a Supra one (bolts in)
If you go a turbo, or the V8, I recommend getting a Truetrac LSD centre, from RABIDCHIMP

Here is the list

3.583 - RA65 Celica(F372)
3.583 - RT142 Corona (F372)

3.727 - RA65 Celica (F302)
3.727 - GA61 Celica XX, (F302
3.727 - MA61 Supra import(F303)

3.909 - RA25 Celica Manual (F313)
3.909 - MX13 Mk2 Corona(manual/auto?) (F312),
3.909 - MX23 Mk2 Corona auto(F312),
3.909 - MA46 Supra (manual/auto?) (F312)
3.909 - MA61 Supra manual (F313)LSD

4.10 - MS110 Crown auto (plated as F362, but was F293 in vehicle),
4.10 - MS112 Crown auto (F292),
4.10 - MX13 Mk2 Corona (F292),
4.10 - MX73 Cressida auto(F292),
4.10 - MA61 Supra auto(ADM) (F293),
4.10 - GZ10 Soarer auto(F292),
4.10 - MZ10 Soarer auto(F292),

4.30 - GA61 Celica manual(F285)LSD
4.30 - MS123 Crown auto(F282)

4.556 - MA63 Supra auto(EDM?) (F252)

4.75 - MS57 Crown auto(F??2 - no build plate fitted)

4.778 - MS110 crown auto(F362)

SUSPENSION

There are a few places that do springs.
Even if they don't list them, they will probably still make custom ones for you (price isn't much greater)
KING SPRINGS
KONI, Cressida not mentioned, but they will do custom.
LOVELLS, Cressida low isn't mentioned, but I'm sure they do them.
DOBINSONS

As for shocks, get Tokico's.
You can see which ones on the RABIDCHIMP website.
MX73 uses the same shocks as the MA61 Supra

I recommend getting PolyUrethane Bushes at the same time, make the ride a little bit stiffer.
Who makes PolyUrethane Bushes?
NOLTEC
NOLATHANE
LOVELLS
SUPERPRO
I dunno whether any of these are available in the USofA, but I'm sure at least one would be.

RABIDCHIMP stock SUPERPRO bushes for the MA61. Crossreference the part numbers to find out which ones may be the same as the MX73

OIL

Manual gearbox, run Redline Lightweight ShockProof.
Diff, not sure, but planning to run Redline of some sort.
REDLINE

RIMS

The stock size is 15x6", with a 20mm offset.

Apparently 17x7" rims, with a 25mm offset fit well.

You then have to be careful what size tyres you put on so that it doesnt scrape.
The largest I have seen on an MX73 was 18x8" on the front (with 245's) and 18x9" on the rear (with 265's), and he had to roll the guards to stop scrubbing.

I would recommend 17x8" on the rear (with 245/40's) and 17x7" on the front (with 215/45's).
This will keep the original tyre height (so speedo is accurate) and should avoid scrubbing.