Clip or engine/transmission? A clip is generally
the best method. There are always exceptions to the rule, i.e. "my
brother gave it to me". I used JARCO (PS tell them Rick in
Tenn. sent you) because as you can see from my pics, they provide
the clip with all engine bay parts, driveline, CAT, fuel pump and
rear suspension member including the Torsen diff.
How much does it cost? Clips alone vary from $1,600
to over $3,000. The quality varies along with the extras, too. Generally
lower priced clips have parts missing, i.e. intercoolers, intakes
etc. Higher priced clips contain more OEM parts but if you are going
for immediate mods then those won't be much benefit.
- What models did the JZA70 have? Standard, Type R, and Limited. Within
each model there were varying options. The Type R had Bilstein shocks
and Recaro seats. The Limited had a digital dash.
What other parts does it require for basic install?
The install requires a MKIV Supra power steering hose either
Toyota (p/n 44403-14020) or aftermarket like PartsAmerica or custom
hose from your local hydraulics shop. Toyota MKIV Supra throttle
cable (p/n 78180-1B090) or custom. Power steering union
bolt from a MKIV Supra if using the MKIV power steering hose..
- How long does it take for the swap? I had everything swapped over
in 3 weeks. The harness extension took 3 days to complete. It would
have been shorter had I not taken the time to convert the Japanese
wiring diagrams to English. Other swaps are in their 2nd year.
- Is there a technical service manual or wiring diagram? Yes but only
in Japanese. I have translated the wiring diagram to English and have
it available on this site.
- What is the factory HP? Toyota lists the 1JZ as 280FWHP. Bone stock
the 2.5L will produce 240RWHP. An intake and 3 inch exhaust can add
up to 30hp. This engine likes to breath.
- Do you need the factory wiring harness? No but it makes it a lot
easier to wire up. If you use the existing harness, it will have to
21-24 inches. There are 2 plugs in the same area as the ECU that will
have to be changed out. Some installers are making an intermediate
harness and mounting a junction box on the firewall.
- Will the JDM radiator fit? Yes, it's a direct bolt-in replacement.
- What type of cooling fan does the 1JZ have? The factory 1JZ (90-93)
used a hydraulic coolant pump and fan with an inline cooler. The 2JZ
waterpump and fan assembly is a direct replacement.
- What are clearance areas to watch? First the passenger side firewall
behind the rear turbo. Second, the driver side PS rack top bracket and
- What about A/C? If you keep the JDM compressor header then only one
A/C line can be used. The second line must be custom made. If you swap
the US compressor header then the rear PS pump bracket must be ground
for clearance to the connectors or removed. Personally, I would opt
for a new A/C line.
- Can you use an NA (W58) transmission? Yes, but not recommended. The
1JZ used the R154 with the 1JZ bellhousing. You can use a W58 with
a 2JZ clutch. The 7M nor the
- What type of clutch does the 1JZ use? The same clutch and pressure
plate as a 7M.
- What type of fluids does the 1JZ take? Use Red Line MTL in the tranny,
and if you get the Torsen diff then use Red Line 75W90NS, otherwise
use 75W90 for the LSD.
- What is the code for a Torsen? Torsen diffs end with a 9 in the 3
digit code, i.e. 299 for a 4.10 Torsen.
- Where do you hook up the oil pressure gauge? The 1JZ-GTE engine does
not have an oil pressure gauge. Instead the JDM car uses 2 types of
oil pressure warning devices. The first is a low pressure sending unit
for a warning light, a la IS 300. The second is an oil level sending
unit for another warning light. The best method is to upgrade the oil
cooler union bolt to the 98 Lexus IS 300/MKIV and affix the 7M oil sending
unit to the union bolt hole via a brass 90 fitting.
- What is the maximum boost on the stock turbos? The stock turbos use
ceramic turbines which are only good up to ~14 PSI boost.
Higher than that and you risk impeller failure quickly. They have been
run as high 19 PSI for very short periods.
- What is the displacement of the 1JZ? 2491cc.
- What is the bore/stroke of the 1JZ? 86x71.5mm
- Can the 1JZ use a 2JZ timing belt? No, different block height would
thow off the timing.
- What 2JZ parts can the 1JZ use? Head gasket, valve cover gaskets,
oil stem seals, water pump pulley, turbo pressure sensor(for MAP), cam
gears, O2 sensor, thermostat, water pump, serpentine belt, igniter.
- What type of injectors are used on the 1JZ? High impedance, side feed
370cc stock. Drop in 440 JDM 2JZ. U.S. spec 550 injectors can be used
if a resistor pack is installed.
- What type of plug wires does the 1JZ use? The 1JZ uses direct coil
packs like the MKIV connected via low voltage wire to the battery for
- What spark plugs? The same plug as the MR2 Turbo (PK20R8 Nippon Denso).
- Is there a replacement for the hydraulic fan? Yes, remove the complete
water pump and replace with a 2JZ water pump.
- What O2 sensor does the 1JZ use? P/N 89465-22130. You can use the
2JZ sensor or one from 91-92 7M-GTE.
- What bolts are used for the flywheel? Bolts from an 87 Corolla GTS
- Where do you get the part numbers for the 1JZ? I have a Japanese
electronic parts catalog. The EPC for specific 1JZ parts is now online..