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Guest Andrew

Engine- 1jz,2jz compatibility and 1.5jz stuff

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Guest Andrew

Don't remember where i found this stuff, but thought it might be useful in here.




Interchangeable Parts Between The 1JZ And 2JZ

BIC Or OEM Engine Brackets


Coil Packs

Spark Plugs

Water Pump

Water Pump Rear Housing O-Ring

Gasket On Rear Water Pump Housing For Brass Coolant Pipe That Runs Around The Block

Serpentine Belt Tensioner

Power Steering Pump

A/C Compressor


Crank Pulley

Water Pump Pulley

Alternator Pulley

Power Steering Pump Pulley

2JZ-GTE Oil Pump (Must Have Crank Position Sensor Hole)

Both Oil Pump To Block O-Rings

Upper And Lower Oil Pan

Timing Belt Hydraulic Tensioner

Timing Belt Idler Pulley

Timing Belt Crank Gear

Cam Gears

Cam Gear Dowel Pin

Cam Position Sensor

Crank Position Sensor

Knock Sensors

Intake Air Temperature Sensor (After Changing Electrical Connector)

Map Sensor

Throttle Position Sensor

JDM Aristo 2JZ 440cc Injectors

USDM 550cc Injectors With Resistor Pack Wired In

2JZ-GE PCV Valve (Works Better, Replaces The Special "S" Hose To A 90 Degree Hose)

2JZ PCV Valve Grommet

Turbo Oil Drain Gasket

Water Pump Pipe O-Rings (Not The Pipe Itself, 1JZ Pipe Is Shorter Than The 2JZ)

Upper Water Neck Gasket To Head


Thermostat O-Ring

Lower Radiator Hose Neck On Water Pump Rear Housing

Oil Filter Housing To Block O-Ring

Oil Cooler Internal O-Rings, Gasket And Crush Washer

ARP Head Studs (Uses 13MM Or 1/2" 12 Point Deep Socket; 1/2" Fits Much Better)

ARP Main Studs

ARP Rod Bolts

Toyota Head Bolts <--From 2JZ-GTE Or 2JZ-GE (USE 10MM 6-Point Hex For Removal) Proof

Toyota Main Bearing Cap Bolts<--From 2JZ-GTE Or 2JZ-GE

Toyota Rod Bolts<--From 2JZ-GTE Or 2JZ-GE

ATI Crank Pulley

Aftermarket Springs And Retainers

Buckets And Shims

Valve Keepers

Main Bearings

Connecting Rod Bearings

Thrusts Washers

Front Main Seal

Rear Main Seal

Oil Cap

Specific 1JZ Parts

Exhaust Gaskets

Upper And Lower Intake Manifold Gaskets

Upper And Lower Intake Manifold

Throttle Body

Throttle Body Gasket

Exhaust Manifold

Idle Speed Control Valve




Connecting Rods


Timing Belt Idler Pulley Bracket (2JZ Pulley Bracket Tensions At A Different Angle = Different)

Timing Belt

Valve Covers

1JZ Cam Gear Cover

1JZ Lower Timing Belt Cover

1JZ Coil Pack Cover

1JZ Oil Cooler Coolant Hoses

1JZ-GTE Twin Turbo Downpipe Flange


1JZ Parts From Other Vehicles

Timing Belt = Same As 137 Teeth 1988+ Isuzu Trooper 4 Cylinder 2.6 Liter Engine (4ZEL)

Cam Seals = Two Choices Available

Cam Seals From A 1995 Toyota Camry V6

Front Main Seal From A 2003 Toyota Highlander Toyota Part Number 90311-38084

1JZ Intake Side Valve Seals : 90913-02090 (NOT THE SAME AS 2JZ)

1JZ Exhaust Side Valve Seals : 90913-02089 (NOT THE SAME AS 2JZ) SAME AS 91-97 4A-FE/7A-FE Exhaust Side Seals


Parts Needed For A 1.5JZ


Want to do a 1.5JZ? Listed below are all the parts needed to do it. They are verified to work, especially the biggest issue, which head gasket to use.

1JZ-GTE Head With Valve train

1JZ-GTE Valve Covers

2JZ-GTE Head Gasket (Has Been Discussed! Read 1.5JZ Head Gasket Selection!)

2JZ-GTE Or 2JZ-GE Block (2JZ-GTE Block Is Much Better)

1JZ-GTE/2JZ-GTE Cam Gears

1JZ-GTE/2JZ-GTE Timing Belt Crank Gear

1JZ-GTE/2JZ-GTE Hydraulic Tensioner

1JZ-GTE/2JZ-GTE Timing Belt Idler Pulley With 2JZ Bracket

2JZ-GTE Timing Belt (1JZ Timing Belt Is Too Short)

1JZ-GTE/2JZ-GTE Serpentine Belt Tensioner

1JZ Upper Water Neck

USDM 2JZ-GTE Toyota Water Pump With Rear Housing (Listed Above)

Hydro Pump Can Be Used; USDM Pump Is Much Simpler And Parts Are Available

1JZ-GTE/2JZ-GTE Thermostat

USDM 2JZ-GTE Water Pump Pipe That Goes To The Water neck (1JZ Pipe Is Too Short)

2JZ-GTE Brass Coolant Pipe That Runs Around The Block

1JZ-GTE/2JZ-GTE Alternator

1JZ-GTE/2JZ-GTE Crank Pulley

1JZ-GTE Upper And Lower Intake Manifold With Throttle Body

1JZ-GTE Fuel Rail (Choose Injectors(370cc,440cc,550cc) Decide ECU Setup First; See Below)

1JZ-GTE Idle Speed Control Valve (2JZ-GTE ISCV Is Different)

1JZ-GTE/2JZ-GTE Power Steering Pump (Optional)

1JZ-GTE/2JZ-GTE A/C Compressor (Optional)

1JZ-GTE/2JZ-GTE Oil Pump (Has To Have CPS Hole)

1JZ-GTE/2JZ-GTE Front Main Seal

1JZ-GTE/2JZ-GTE Rear Main Seal

JDM/USDM 2JZ-GTE/2JZ-GE Oil Filter Cooler Housing (USDM Housing Is Easier To Get Parts)

Lexus Union Bolt Can Be Tapped For A Oil Feed Line/Pressure Sensor (See Link)

Link Shows Modification For Oil Pressure Sensor But A Feed Line Setup Will Work

JDM/USDM 2JZ-GTE Oil Filter Cooler Housing Coolant Hoses (2JZ-GE Housing Has No Oil Cooler)

1JZ-GTE/2JZ-GTE Upper And Lower Rear Sump Oil Pan With Pick-Up

2JZ-GTE Oil Level Dipstick (1JZ Dipstick Is Short, Will Not Bolt On Manifold With Modification)

1JZ-GTE/2JZ-GTE Knock Sensors

1JZ-GTE/2JZ-GTE Crank Sensor

1JZ-GTE/2JZ-GTE Cam Sensor

1JZ-GTE/2JZ-GTE Coil Packs

1JZ-GTE/2JZ-GTE Igniter

1JZ-GTE/2JZ-GTE Resistor Pack (Depends On Your Injector Choice; See Below)

1JZ-GTE/2JZ-GTE Intake Air Temperature Sensor

1JZ-GTE/2JZ-GTE Map Sensor


1JZ-GTE/2JZ-GTE Engine Temperature Sensor (For The Computer; Two Pin Green Plug)

1JZ-GTE/7M-GTE Engine Temperature Sensor (For The Gauge Cluster; Single Pin Plug)

Drivetrain Is Everything For The Standard 1JZ/2JZ Swap (Listed Above)

BIC Engine Brackets (Listed Above)

MKIV Supra Throttle Cable Listed For Standard 1JZ/2JZ Swaps (Listed Above)


1JZ-GTE Intake/Exhaust Valve Options


The 1JZ-GTE intake and exhaust valves are not readily available in the states but you can use oversized valves from the 2JZ.


1JZ-GTE Valve Specs

Intake Valve = 31mm

Exhaust Valve = 30mm



2JZ-GTE Valve Specs

Intake Valve = 33.6mm

Exhaust = 29mm



You can use stock 2JZ-GTE Intake Valves and +1MM 2JZ-GTE Exhaust Valves to retain the stock port size or custom +2MM 2JZ-GTE Exhaust Valves to go oversize. There is no need for +2MM exhaust valves on the 1JZ as the 2JZ is a 3.0L motor and has a smaller exhaust valve. It is said that when the exhaust ports are opened, the exhaust gas velocity is reduced which can add to turbo lag.



1.5JZ Head Gasket Thickness Selection


You will have to verify the compression ratio you want to use. The stock compression ratio of a 1JZ-GTE and 2JZ-GTE is 8:5. You can go higher if you like BUT you will need to keep in mind that you will need a standalone to tune your motor to avoid issues.



Follow These Steps:

Determine If You Have A 2JZ-GTE Or 2JZ-GE Block (GTE Has Oil Feed Holes On Exhaust Side)

Determine If You Want Top End(Less Compression) Or Bottom End(Higher Compression)

Measure The Piston To Block Deck Height(Will Vary After Milling Block)

Bring The Piston To True TDC

Place Straight Edge Along Deck Of The Block

Slide Feeler Gauge Between Highest Point Of Piston And Straight Edge

Record Values And Use Average; (Add All; Divide Total By Six)

Figure Out The CC's Of Your 1JZ Head Combustion Chamber:

Get One Peice Of Plexiglass That Will Cover One Combustion Chamber At A Time

Get A Jar Of Vaseline

Get A Syringe With Volume Measured In CC

Drill A Hole In The Center Of The Plexiglass

Put Light Coat Of Vaseline Around The Head's Combustion Chamber

This Is Used To Seal The Plexiglass Against The Head's Deck

Fill Each Chamber With Vegetable Oil; Make Note Of Needed Amount Per Chamber

You Will Know The Chamber Is Full; Oil Will Touch Glass

Each Chamber's Volume Reading Should Be Close To Each Other

If The Volume Readings Are Not Close To Each Other, Mill Head

Do All Six Chambers And Average Them Out (Add All Of Them;Divide Total By Six)

Example Of This Process Is In The Link Area

Plug In All The Numbers In The Compression Ratio Calculator In The Link Area



Numbers For Compression Ratio Calculator

Bore And Stroke Are In MM; When Using The Calculator In The Link, Enter 2

Cylinder Bore Size = 86MM

Piston Stroke Length = 86MM

Head Gasket Bore Diameter = Your 2JZ Head Gasket Bore Diameter

Enter Compressed Head Gasket Thickness = 1.1

Combustion Chamber Volume In CCs = YOUR MEASURED AVERAGE VALUE

Stock 1JZ Uncut/Never Milled Head Is 40CC

Piston Dome Volume In CCs (Negative For Dished Pistons)

2JZ-GE Pistons = -9 <--Negative

2JZ-GTE Pistons = Don't Know; Local Machine Shop Can Measure For You

Piston Deck Clearance (Negative If ABOVE Deck) = YOUR MEASURE VALUE


The compressed head gasket value is what determines your compression ratio. The thicker the head gasket, the more the thickness becomes when the head gasket is compressed which in turn lowers the compression ratio.



1JZ-GTE/2JZ-GTE Torque Specs

Stock Head Bolts - 26ft/lbs Then 90 Degree Turn...Then Another 90 Degree Turn

Stock Connecting Rod Bolts - 22ft/lbs Then A 90 Degree Turn

Main Bearing Cap Bolts - 26ft/lbs Then 90 Degree Turn...Then Another 90 Degree Turn



1.5JZ Turbo Options


You can have many different options for your turbo setup with your 1.5JZ-GTE Motor. It now has a bigger bottom end displacement to spool larger turbos much quicker. Listed below is a twin setup and a generic single setup. There have been instances where the 2JZ-GTE twins were modified to bolt onto the 1JZ-GTE manifold. Here is a general ideal if you want to run twins on a 1.5JZ, the head is a 1JZ so treat it as such. If you wanted to bolt a new twin setup that would fit DIRECTLY onto a 1JZ-GTE, it would fit a 1.5JZ-GTE as well BUT you will have to be careful about your oil and drain lines.


Since a setup that would bolt onto a fully stock 1JZ-GTE takes into consideration the block is a 1JZ-GTE block, you cannot assume that it would fit on a 2JZ-GTE block. The reason for this is because the 2JZ-GTE block is an 1/2" taller, so that means the 1JZ-GTE head will sit a 1/2" higher, meaning the turbo setup will sit 1/2" higher as well. The oil feed and drain on the 1JZ-GTE and 2JZ-GTE are in the same place but now you are relocating the turbo an extra 1/2" away. The solution for this is to use 2JZ-GTE stock feed and drain hardlines. The coolant lines are fine because they utilize coolant hoses to reach the water neck like the 7M does.


Stock Twin Turbo Setup

1JZ Twin Turbo Manifold; Two Pieces, Three Cylinders Each

1JZ-GTE Turbos With All Aluminum Piping Or Retro Fitted 2JZ Turbos By Albert

2JZ-GTE Oil Feed And Drain Hardlines

1JZ-GTE Coolant Flange On Turbo; Connect To Water Neck With Coolant Compatible Hose

1JZ-GTE Y-Pipe

1JZ-GTE Downpipe Flange To Mate To Your Exhaust

Single Turbo Setup

1JZ-GTE T3 Or T4 Manifold

1JZ-GTE T3 Or T4 Turbo

Oil Feed Line

Oil Drain Line

Oil Drain Fitting For Oil Pan 1JZ-GTE/2JZ-GTE Oil Pan Drain Flange

Oil Feed Fitting For Block (Block's Thread Is M12x1.25; Seals With A Crush Washer)

Downpipe Of Your Choice; Four Bolt Or V-Band

Coolant Lines (If Oil Cooled)


1.5JZ ECU Options


There are a lot of ways you can control your new 1.5JZ. You can run it off a 1JZ-GTE computer, 2JZ-GTE computer or a Standalone. Standalone is self explanatory once you decide what harness you will use. It was stated above that 1JZ-GTE computers, whether a Supra or Soarer, have issues. You can get it recapped but you have another option. Why not run a Aristo 2JZ-GTE harness and Aristo 2JZ-GTE computer. The Aristo computer is better than the USDM one as it does not used a MAF setup, instead it's a speed density setup like the 1JZ-GTE. Take a look below.


1JZ-GTE Computer

1JZ Harness

Stock 370CC Fuel Injectors

No Injector Resistor Pack Needed

Aristo 2JZ-GTE Computer

2JZ Aristo Harness

Stock 440CC Injectors (Fits In 1JZ Rail; The Tabs On The Injectors Needs To Be Trimmed)

USDM 550CC Injectors (Fits In 1JZ Rail; The Tabs On The Injectors Needs To Be Trimmed)

Injector Resistor Pack Needed ONLY For 550CC Injectors

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First list included cams AND camshafts. Both (lol) are not interchangable. 2jz cams can go into a 1jz if the thrust bearing is machined to fit. Not the other way around.


You probably know it, just pointing it out. Didn't read the rest.

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lol. i found the info searching old supraforums posts and reading your build a long time ago.


hurts my eyes to read it all.

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Guest Andrew

haha oh well found this and was trying to contribute, who cares.

There are probably lots of things that are wrong, might be fun to point them out,

or just move it too the groundhog day section.

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may be a sticky in the newbie tech section? it's bound to help someone that will ask one of those questions. then we can just refer to this thread and be total jackasses and flame the guy instead of typing actual words like they do on regular forums

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you can fit any turbo to any head. dont know why NGAs think it's noteworthy. Thats some sad shit.

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