HKS LIGHTWEIGHT FORGED CRANKSHAFT FOR NISSAN RB26DETT 23006-AN003

 

HKS LIGHTWEIGHT FORGED CRANKSHAFT FOR NISSAN RB26DETT 23006-AN003

The HKS Lightweight Forged Crankshaft for Nissan RB26DETT (Part No. 23006-AN003) is a high-end internal engine component designed for serious RB builds, typically used in 2.8L stroker conversions (HKS STEP kits).

Here’s a clear breakdown of what it is and why it matters:

🔧 What it is

• Brand: HKS
• Part number: 23006-AN003
• Engine: Nissan RB26DETT (Skyline GT-R R32/R33/R34)
• Type: Lightweight forged crankshaft (fully counterweighted)
• Use case: High-performance / racing / forged rebuilds

⚙️ Key technical features

From HKS STEP 2 kit data and product specs:

• Forged steel construction → much stronger than OEM cast crank
• Lightweight design → improves throttle response and acceleration
• Fully counterweighted → reduces vibration at high RPM
• Stroke: ~77.7 mm (used for 2.8L RB26 builds)
• Surface treatment (Tufftride / nitriding) → improves wear resistance and fatigue strength
• Designed to handle high RPM + high boost applications

🚗 Why enthusiasts use it

This crank is not a “bolt-on power mod”—it’s part of a full engine rebuild/stroker setup.

It is typically paired with:

• Forged pistons
• Forged H-beam rods
• Balanced rotating assembly
• Aftermarket ECU tuning

Together, it supports:

• Higher displacement (2.8L vs 2.6L stock)
• Better torque across the rev range
• Stronger reliability under high boost (track / drag / time attack use)

💥 What makes it special vs OEM RB26 crank

Feature	HKS forged crank	OEM RB26 crank
Material	Forged racing steel	Cast steel
Strength limit	Very high (built motors)	Moderate-high
Weight	Lighter	Heavier
Balance	Fully counterweighted	Less optimized
Use case	Race / stroker builds	Stock / mild tuning

⚠️ Important reality check

• This crank alone does NOT increase power
• Requires full engine build + machining
• Very expensive and usually used in builds targeting 500–1000+ hp setups
• Needs precise balancing or it can damage the engine

💡 Bottom line

The HKS 23006-AN003 is basically:

A motorsport-grade crankshaft used to turn an RB26DETT into a fully built, high-RPM 2.8L performance engine.

HKS LIGHTWEIGHT FORGED CRANKSHAFT FOR NISSAN RB26DETT 23006-AN003

RSE BERYLLIUM VALVE SEAT RING FOR NISSAN RB26DETT RA310A-NS05A

 

RSE BERYLLIUM VALVE SEAT RING FOR NISSAN RB26DETT RA310A-NS05A

The RSE Beryllium Valve Seat Ring Set for RB26DETT (RA310A-NS05A / TA310A-NS05A) is a high-end performance valve seat upgrade used in heavily built Nissan RB26 engines.

🔧 What this part actually is

It is a full set of valve seat rings made from a beryllium-copper alloy (BeCu), designed for:

• Nissan RB26DETT intake + exhaust valve seats
• High-RPM, high-boost racing builds
• Cylinder head rebuilds requiring maximum heat management

⚙️ Part number clarification

You may see it listed as:

• TA310A-NS05A (most common Tomei designation)
• Sometimes cross-referenced as RA310A-NS05A / RSE catalog naming

They generally refer to the same RB26 beryllium seat ring kit, depending on distributor labeling.

🔥 Why beryllium valve seats are special

Compared to OEM cast iron seats, beryllium-copper offers:

1. Extreme heat transfer

• Pulls heat away from the valve faster
• Helps reduce valve burning in high-boost setups

2. Higher detonation resistance support

• Cooler combustion chamber temps = safer high boost tuning window

3. Better high-RPM durability (when machined correctly)

• Stable under sustained racing load

⚠️ Important real-world considerations (very important for RB builds)

This is not a “bolt-in upgrade”—it requires proper machine work:

• Cylinder head must be precision-machined for BeCu interference fit
• Requires correct seat geometry + valve lapping procedure
• Typically used only in:
• 500–1000+ hp RB26 builds
• Circuit / drag / time attack engines

Risks if done wrong:

• Seat movement or loosening (material is softer than steel)
• Incorrect heat treatment or machining = fast wear
• Requires experienced RB machine shop

🧠 Why builders use it on RB26

The RB26DETT is already strong, but in high boost builds:

• Exhaust valve temps get extreme
• OEM seats can become a limiting factor
• Beryllium seats improve thermal control more than raw strength

💰 Market position

• Premium motorsport-grade component
• Usually found in full head rebuild packages
• Not necessary for mild/stock turbo RB26 setups

✔️ Summary

This kit is essentially a motorsport-level cylinder head upgrade for the RB26 that prioritizes:

• Heat control 🔥
• High-RPM stability 💨
• Knock resistance margin ⚙️

But it only performs properly when paired with precision head machining and proper valvetrain setup.

RSE BERYLLIUM VALVE SEAT RING FOR NISSAN RB26DETT RA310A-NS05A

JUN AUTO TURBINE ADAPTER FOR SUBARU EJ20 5005A-F001

 

JUN AUTO TURBINE ADAPTER FOR SUBARU EJ20 5005A-F001

JUN AUTO Turbine Adapter 5005A-F001 is a specialized turbo conversion adapter developed by  JUN Auto Mechanic for Subaru EJ20 boxer engines. 

Its primary role is to allow fitment of larger Mitsubishi TD05/TD06 external wastegate turbochargers onto Subaru EJ-series layouts that originally have restrictive factory mounting geometry.  

Core Engineering Philosophy

Subaru EJ engines use a horizontally-opposed (“boxer”) layout, making turbo routing unusually tight and asymmetrical. Factory turbo positioning limits:

• turbo size,
• compressor housing clearance,
• exhaust flow efficiency,
• and external wastegate configurations.

The JUN adapter acts as a transition interface between:

• the EJ exhaust manifold/turbo flange,
• and larger TD05/TD06 turbine housings.

This enables:

• larger compressor wheels,
• higher airflow ceilings,
• improved boost stability,
• and race-oriented turbo configurations.  

Technical Advantages

1. Enables Large Turbo Conversion

The adapter supports:

• TD05,
• TD06,
• external wastegate turbo setups.

These turbos flow significantly more air than stock IHI units used on many Subaru WRX/STi EJ20 engines.

Result:

• much higher horsepower ceiling,
• especially above 400–600 hp builds.  

2. Better High-RPM Breathing

Larger turbine housings reduce exhaust backpressure at high RPM.

Advantages:

• improved top-end power,
• lower exhaust gas temperature,
• reduced turbine choking,
• more stable boost at redline.

This matches JUN’s traditional philosophy:

sacrifice some low-end lag for violent upper-RPM acceleration.

Very popular in:

• time attack,
• circuit racing,
• drag Subaru builds.

3. External Wastegate Compatibility

External wastegate systems control boost more accurately than many internal-gate systems.

Benefits:

• reduced boost creep,
• cleaner boost curve,
• improved anti-lag compatibility,
• higher reliability under extreme boost pressure.

4. Motorsport-Oriented Construction

JUN parts are designed around:

• endurance,
• thermal stability,
• repeated heat cycling.

Typical material philosophy includes:

• precision-machined steel,
• thick flange sections,
• crack resistance,
• high-temperature durability.

That matters because EJ engines generate enormous exhaust heat near cylinders #2 and #4.

Important Installation Notes

JUN specifically notes:

• intercooler relocation/modification may be required,
• custom piping fabrication is necessary,
• some large compressor housings may not clear certain GRB chassis setups.  

This is NOT a simple bolt-on part for beginners.

Usually paired with:

• custom equal-length headers,
• upgraded fuel systems,
• standalone ECU tuning,
• forged internals,
• high-flow intercoolers.

Best Subaru Platforms for This Adapter

Compatible mainly with:

• Subaru GC8 WRX/STi,
• GDA WRX,
• EJ20 single-port entry setups.  

Ideal for:

• EJ207 builds,
• forged EJ20 stroker engines,
• track-focused Imprezas.

JUN vs Typical Turbo Adapters

Feature	JUN Adapter	Generic Adapter
Heat durability	Excellent	Moderate
Flow optimization	Motorsport-grade	Usually basic
Fitment precision	High	Varies
Turbo stability	Excellent	Depends
High-boost reliability	Very high	Moderate
Intended use	Racing/Time Attack	Street conversion

Insight — Why JUN Parts Are Respected

JUN became legendary because they engineer around:

• airflow physics,
• combustion efficiency,
• and endurance under race abuse.

Their Subaru projects historically focused on:

• large single turbo efficiency,
• sustained high-RPM operation,
• thermal survivability,
• and stable power delivery.

Unlike many “show parts,” JUN components were built around real motorsport data from:

• GT racing,
• time attack,
• and high-speed endurance builds.  

JUN AUTO TURBINE ADAPTER FOR SUBARU EJ20 5005A-F001