JUN AUTO CUSTOM KIT FOR TOYOTA 3S-GTE 1029M-T004

 

JUN AUTO CUSTOM KIT FOR TOYOTA 3S-GTE 1029M-T004

JUN AUTO CUSTOM KIT — Toyota 3S-GTE BASIC-II 2.2L

Part No. 1029M-T004

This is a serious bottom-end rebuild package from JUN Auto Mechanic for the legendary Toyota 3S-GTE turbo four-cylinder. 

The important point: 1029M-T004 is the BASIC-II version, not JUN’s more complete EX version.

🔩 What you actually get

JUN specifies the 1029M-T004 as a 2.2-litre 3S-GTE conversion:

Component	JUN specification
Bore	87.0 mm
Stroke	92.0 mm
Displacement	2,188 cc
Compression ratio	8.3:1
Pistons	Forged C-Series ×4
Piston pins	×4
Piston rings	×4 sets
Crankshaft	Billet
Connecting rods	Not included
Kit	BASIC-II
Part number	1029M-T004

JUN confirms that the BASIC-II uses the same 87 × 92 mm geometry as its EX 2.2L kit and incorporates a billet crankshaft. 

🧠 Why 2.2L is such a big deal

The standard 3S-GTE is roughly 2.0L. JUN pushes it to 2.188L by increasing both bore and stroke.

That extra 188 cc gives the turbo engine more displacement leverage:

More displacement → more air/fuel capability → stronger torque potential → turbo doesn’t need to work as hard for the same output.

The 92-mm stroke also changes the character of the engine. Rather than building a 3S-GTE purely around enormous top-end RPM, the 2.2L configuration can provide a broader, stronger torque curve.

⚙️ The really exotic part: billet crankshaft

The crankshaft is 1003M-T003, JUN’s billet 3S-GTE crankshaft. JUN specifically identifies this crank as being used for both the EX and BASIC-II 2.2L Custom Kits. 

Think of the hierarchy:

OEM 3S-GTE crank
↓
Forged upgrade
↓
JUN billet crankshaft

A billet crank gives JUN considerably more freedom over the crank’s geometry, material and machining compared with simply modifying an OEM component.

🏎️ BASIC-II vs EX

This is where the product number becomes important:

1029M-T004 = BASIC-II

1029M-T003 = EX

The EX includes:

• Forged C-Series pistons
• I-beam connecting rods
• Billet crankshaft

The BASIC-II includes:

• Forged C-Series pistons
• Billet crankshaft
• No connecting rods

JUN specifically states that its 1002M-T003 connecting rods can be used with the BASIC/BASIC-II kits. 

So BASIC-II is essentially a flexible foundation where the builder can select the appropriate connecting-rod solution rather than buying the complete EX package.

🔥 Why enthusiasts would build this

The philosophy is very different from simply bolting a larger turbo onto a stock 3S-GTE.

You’re strengthening the foundation of the engine first:

87 mm forged piston
↓
92 mm stroke
↓
2,188 cc displacement
↓
billet crankshaft
↓
appropriate connecting rods
↓
turbo + cylinder head + fuel + ECU

That is the architecture of a purpose-built high-output 3S-GTE, rather than an ordinary bolt-on engine.

One interesting detail: JUN lists the piston compression ratio at 8.3:1, referenced with a 1.2-mm head gasket. 

💴 Current JUN-listed price

JUN’s current English product page lists the 1029M-T004 BASIC-II at ¥580,000 before tax, while the tax-inclusive Japanese listing shows ¥638,000. 

In one sentence:
1029M-T004 is JUN’s 87 × 92 mm, 2.188L 3S-GTE forged-piston + billet-crank foundation—a beautifully engineered route to turn Toyota’s 2.0L turbo four into a much more serious 2.2L performance engine. 

JUN AUTO CUSTOM KIT FOR TOYOTA 3S-GTE 1029M-T004