JUN AUTO CAMSHAFT KIT FOR TOYOTA 2JZ-GTE 1033M-T006

 

JUN AUTO CAMSHAFT KIT FOR TOYOTA 2JZ-GTE 1033M-T006

The JUN AUTO Camshaft Kit for Toyota 2JZ-GTE 1033M-T006 is a hardcore Japanese valvetrain package.

It was designed for high-RPM, high-boost 2JZ builds — especially drag, top speed, and circuit Supra projects pushing well beyond stock turbo limits.

What makes the JUN 1033M-T006 special?

The 1033M-T006 is not just “cams only.” It is a complete valvetrain philosophy from  JUN AUTO aimed at eliminating valve float and shim failure at very high RPM. The kit includes:

• Intake cam: 272° duration / 10.8 mm lift
• Exhaust cam: 272° duration / 10.8 mm lift
• Uprated valve springs
• Type 2 retainers
• “Inner Shim R” conversion system (shim-under-bucket style)  

Why the “Inner Shim R” matters

Toyota factory 2JZ heads use shim-over-bucket design on early engines. At extreme RPM:

• the shim can jump out,
• valve float can occur,
• and catastrophic engine damage becomes possible.

JUN converts the setup into shim-under-bucket:

• safer above 8500 RPM,
• more stable valve control,
• better for anti-lag, huge boost, and sustained racing abuse.

This is why JUN is respected in old-school Japanese tuning circles alongside brands like  HKS and  TOMEI Powered.

Technical Character 

JUN philosophy

JUN cams prioritize:

• maximum airflow at high RPM,
• aggressive overlap,
• turbo efficiency at large turbine flow rates,
• race durability.

Result:

• weaker idle quality,
• reduced low-end response,
• explosive top-end power.

This is the type of cam profile used in:

• 800–1400 hp Supras,
• drag 2JZs,
• standing-mile builds,
• old Option Video / Top Secret style monsters.

Comparison with HKS and Tomei

HKS cams are smoother and more OEM-refined. They:

• spool turbos earlier,
• idle cleaner,
• work beautifully for street Supras,
• retain strong midrange torque.

Best for:

• 500–800 hp builds,
• responsive street cars,
• twin-turbo street tuning.

Tomei sits between HKS and JUN:

• more aggressive than HKS,
• more streetable than JUN,
• famous for quick turbo response.

Excellent for:

• drift builds,
• responsive single turbo setups,
• track-day cars.

Attribute	JUN AUTO Camshaft Kit for Toyota 2JZ-GTE 1033M-T006	HKS 2JZ-GTE 264 Intake Cam	Tomei Procam/Poncam 2JZ-GTE Set
Philosophy	Full race	Street-track balance	Aggressive street/track
Duration	272°	264°	260- 270°
Lift	10.8 mm	Lower/moderate	Moderate-high
Idle Quality	Rough	Smooth	Moderate
Turbo Spool	Later	Earlier	Fast
High RPM Stability	Extremely high	Good	Very good
Best RPM Range	5000- 9500+	3000- 8000	3500- 8500
Best Use	Drag/top speed	Street Supra	Drift/track
Valve Train Included	Yes	Usually cams only	Usually cams only
Inner Shim Conversion	Yes	No	No

 Real-world behavior

JUN 272/10.8 cams feel like:

• calm below 4000 rpm,
• suddenly violent after boost threshold,
• massive top-end pull,
• “monster Supra” personality.

They are ideal with:

• large single turbo,
• built bottom end,
• aftermarket ECU,
• ported head,
• upgraded fuel system.

Without supporting mods, they can actually make the car slower at low RPM.

Advantages of JUN over others

1. Complete engineering package
   Not just cams — entire valve control system.
2. Better for extreme RPM
   Shim-under-bucket is safer for racing.
3. Massive airflow potential
   10.8 mm lift is very serious territory.
4. Legendary Japanese motorsport pedigree
   JUN has history in:

• JGTC,
• drag racing,
• Bonneville speed projects.

Weaknesses

• Expensive
• Requires professional tuning
• Rough idle
• Reduced street comfort
• Overkill for mild builds
• Not ideal for stock twins

Conclusion

If:

• HKS = samurai precision,
• Tomei = street warrior,
• JUN = katana forged for war.

The JUN 1033M-T006 is for builders chasing:

• maximum airflow,
• ultra-high RPM reliability,
• and brutal top-end dominance.

For a 600 hp street Supra, HKS or Tomei is usually smarter.

For an 850–1400 hp full-send 2JZ monster, JUN becomes one of the most serious Japanese valvetrain systems ever made.  

JUN AUTO CAMSHAFT KIT FOR TOYOTA 2JZ-GTE 1033M-T006

Why HKS chose I-BEAM instead of H-BEAM For TOYOTA GR86 ZN8 SUBARU BRZ ZD8 FA24 23004-AT001

 

Why HKS chose I-BEAM instead of H-BEAM For TOYOTA GR86 ZN8 SUBARU BRZ ZD8 FA24 23004-AT001

THE HKS I-BEAM CONNECTING ROD STEP1 FOR TOYOTA GR86 ZN8 SUBARU BRZ ZD8 FA24 23004-AT001 is a very serious level bottom-end upgrade for the FA24 engine found in the Toyota GR86 and Subaru BRZ. 

It is designed for high-RPM durability, forced induction builds, aggressive tuning, and endurance reliability. HKS engineered this rod together with their forged piston and crankshaft ecosystem rather than as a random standalone rod.  

1. Why HKS chose I-BEAM instead of H-BEAM

HKS intentionally selected an I-beam architecture because the FA24 is a high-revving boxer engine with long-stroke dynamics and severe tensile loading at high RPM.

Advantages of I-beam:

• Better tensile strength-to-weight ratio
• Higher resistance to rod stretch at extreme RPM
• Lower rotating mass
• Better buckling resistance during combustion events
• Narrower beam improves crankcase clearance
• Faster engine response and rev climb

Compared to many H-beam rods:

• H-beams are usually heavier
• Better for massive torque drag setups
• But can create more inertia stress at sustained RPM

Community engine builders often note that quality I-beams behave exceptionally well in high-RPM engines because they resist stretch while remaining lighter.  

For the FA24:

• HKS targeted balance
• Not just brute force
• The goal is stable high-speed endurance

This matches the GR86/BRZ philosophy:

• sharp throttle
• fast transient response
• linear rev behavior

2. Forging Material Advantage

HKS uses forged high-strength alloy material throughout the STEP1 ecosystem. Their piston system specifically uses A2618 forged alloy because of its excellent high-temperature strength.  

Benefits of forged construction:

• Grain structure aligns under forging pressure
• Much stronger than cast rods
• Better fatigue resistance
• Handles detonation better
• Survives repeated thermal cycling
• Reduced risk of microscopic cracking

Why this matters in FA24:

• Boxer engines experience complex side loading
• Turbocharging dramatically increases rod stress
• High compression + high RPM = violent tensile loads

A forged rod survives:

• hard launches
• sustained track heat
• repeated redline pulls
• turbo boost spikes

far better than stock powdered-metal rods.

3. Molybdenum Coating Advantage

HKS includes molybdenum technology within the piston/rotating assembly philosophy. Their FA24 STEP1 piston kit uses a two-layer molybdenum coating to reduce friction.  

Why this matters:

Moly coating benefits

Reduced friction

• Less parasitic drag
• Faster revving
• Smoother piston movement

Improved oil retention

• Moly surfaces hold lubrication better
• Critical during cold starts
• Helps under high G-force cornering

Heat resistance

• Moly survives extremely high temperatures
• Prevents scuffing under boost

Lower wear

• Reduced piston skirt abrasion
• Less cylinder wall damage

Better emergency protection

If oil film momentarily weakens:

• moly acts as sacrificial anti-friction layer
• helps prevent catastrophic scoring

This is especially important in:

• track GR86 builds
• turbo FA24s
• endurance driving
• repeated canyon runs

4. Cracked Rod Technology

HKS uses cracked-cap rod technology.  

Why this is advanced:

• Rod cap fractures naturally along engineered grain lines
• Creates perfectly matching surfaces
• Better alignment precision
• More stable bearing housing geometry
• Less cap walk at high RPM

This improves:

• bearing stability
• oil film consistency
• crankshaft accuracy

At 8000+ RPM:
tiny distortions matter enormously.

5. Why this rod is excellent for turbo FA24

The FA24 creates strong midrange torque.

Turbocharging increases:

• cylinder pressure
• rod compression load
• tensile load during exhaust/intake overlap

The HKS rod helps by:

• resisting deformation
• maintaining bearing alignment
• reducing rotating inertia
• surviving detonation events better

HKS themselves recommend stronger rod/crank combinations for turbo applications generating high torque.  

6. Real Engineering Philosophy of HKS STEP1

STEP1 is not “full drag insanity.”

It is:

• OEM+ engineering
• motorsport reliability
• high-RPM endurance
• street-track balance
• refined response

This is classic Japanese tuning philosophy:

• precision
• balance
• thermal stability
• drivability

rather than only chasing dyno numbers.

Why HKS chose I-BEAM instead of H-BEAM For TOYOTA GR86 ZN8 SUBARU BRZ ZD8 FA24 23004-AT001