CSF High-Performance All-Aluminum Radiator - Black | 1994-1998 Nissan GT-R / GTS R33 (7230B)

Keep your R33 running cool under pressure with the CSF high-performance all-aluminum radiator. Engineered specifically for the 1994-1998 Nissan Skyline GT-R (BCNR33) and GTS (ECR33), the CSF 7230B features a 2-row 42mm core with CSF's exclusive B-Tube technology, multi-louvered fins, and a black finish — delivering significantly improved cooling capacity over the factory radiator for high-power RB26DETT and RB25DET builds.

Key Features:

• 2-row 42mm all-aluminum core
• CSF exclusive B-Tube technology
• Multi-louvered fin design
• Black finish
• Increased fluid capacity over factory radiator
• Direct-fit for 1994-1998 Nissan R33 GT-R and GTS
• CSF Racing quality and engineering
• 16.7 lbs

Performance Benefits:

• B-Tube Technology: Increases heat transfer by approximately 15% over regular oval welded tubes
• 2-Row 42mm Core: Greater fluid capacity and heat dissipation than factory radiator
• Multi-Louvered Fins: Maximizes airflow through the core for best possible cooling performance
• All-Aluminum Construction: Superior heat dissipation and lighter weight than factory copper/brass radiators
• Black Finish: Clean, stealth appearance in the engine bay
• Increased Surface Area: More cooling tubes means more surface area for coolant heat dissipation

Specifications:

• Brand: CSF Racing
• Part Number: 7230B
• Core: 2-row, 42mm
• Construction: All-aluminum
• Technology: CSF B-Tube
• Fins: Multi-louvered
• Finish: Black
• Weight: 16.7 lbs
• Barcode: 71035307230B

Fitment Information:

• 1994-1998 Nissan Skyline GT-R R33 (BCNR33) — RB26DETT twin-turbo
• 1993-1998 Nissan Skyline GTS R33 (ECR33) — RB25DET single-turbo
• Note: Verify your specific R33 variant and radiator configuration before ordering
• Note: Not for R32 (BNR32) or R34 (BNR34) GT-R — R33 specific
• Installation: Professional installation recommended

What's Included:

• CSF all-aluminum radiator — black (7230B)
• Note: Coolant, hoses, and clamps sold separately
• Note: Refer to CSF installation documentation for fitment and connection details

Installation Notes:

• Professional installation recommended
• Drain factory coolant completely before removal
• Flush cooling system before installing new radiator
• Inspect all coolant hoses and clamps — replace if cracked or worn
• Use correct coolant type and concentration per Nissan specifications
• Bleed cooling system thoroughly after installation to remove air pockets
• Check for leaks at all connections after first heat cycle

CSF B-Tube Technology — The Core Advantage:

The most significant engineering feature of the CSF 7230B is CSF's exclusive B-Tube technology. In a conventional radiator, coolant flows through oval or round tubes that are welded at the seams. The B-Tube design uses a tube with a distinctive B-shaped cross-section — the internal geometry of the tube creates turbulence in the coolant flow, disrupting the boundary layer of coolant that forms along the tube wall. This boundary layer is a thin film of relatively stagnant coolant that acts as an insulator, reducing the rate of heat transfer from the coolant to the tube wall. By disrupting this boundary layer, the B-Tube design increases the rate of heat transfer from the coolant to the aluminium tube by approximately 15% compared to conventional oval welded tubes. This 15% improvement in heat transfer efficiency is achieved without increasing the size of the radiator or the coolant flow rate — it is a pure engineering improvement in the core's thermal efficiency.

2-Row 42mm Core — Capacity and Efficiency:

The CSF 7230B uses a 2-row core with 42mm tube depth. The 2-row configuration means coolant passes through two rows of tubes as it flows through the radiator core, increasing the total tube surface area and coolant capacity compared to a single-row design. The 42mm tube depth provides substantial core thickness for effective heat dissipation. Together, the 2-row layout and 42mm depth provide significantly greater fluid capacity than the factory R33 radiator, allowing more coolant volume to be cooled per pass through the radiator. This increased capacity is particularly important on high-power RB26DETT builds where heat rejection demands are substantially greater than stock.

Multi-Louvered Fins — Airflow Optimization:

Between the coolant tubes, the CSF radiator uses multi-louvered aluminium fins. Louvered fins are cut and bent at precise angles to create a series of small air deflectors that disrupt the airflow boundary layer on the fin surface — the same principle as the B-Tube technology, but applied to the air side of the heat exchange. By disrupting the air boundary layer, the louvered fins increase the rate of heat transfer from the aluminium fin to the passing air. The multi-louvered design maximizes this effect across the entire fin surface, ensuring that airflow through the core is used as efficiently as possible for heat dissipation. The result is a radiator that extracts maximum cooling performance from the available airflow, which is particularly important at lower vehicle speeds where airflow through the radiator is limited.

All-Aluminum Construction:

The CSF 7230B is constructed entirely from aluminium, replacing the factory copper/brass radiator construction used on the R33. Aluminium provides several advantages over copper/brass for performance radiator applications. Aluminium has a higher thermal conductivity than brass (though lower than copper), but its significantly lower density means an aluminium radiator can be made with thicker walls and more material for the same weight as a copper/brass unit. Aluminium also responds more quickly to temperature changes, providing faster cooling response when coolant temperature rises. The all-aluminium construction also eliminates the galvanic corrosion that can occur at the joints between copper tubes and brass tanks in factory radiators, improving long-term durability.

R33 GT-R and GTS — Cooling Demands:

The R33 Skyline GT-R (BCNR33) is powered by the RB26DETT — Nissan's legendary 2.6L twin-turbocharged inline-6, producing 276 hp in factory form and capable of significantly more with modifications. The RB26DETT's twin-turbo configuration and high-performance nature generate substantial heat, and the factory cooling system is sized for stock power levels. As power increases through turbo upgrades, boost increases, and engine modifications, heat rejection demands increase proportionally. The factory radiator becomes a limiting factor for sustained high-power operation, particularly on track days or in hot climates. The CSF 7230B's increased core capacity and B-Tube technology provide the additional cooling capacity needed to keep coolant temperatures in check on modified R33 GT-R builds. The GTS (ECR33) with its RB25DET single-turbo similarly benefits from the improved cooling capacity for modified applications.

Black Finish — Engine Bay Aesthetics:

The black powder coat finish on the CSF 7230B provides a clean, stealth appearance in the R33's engine bay. The black finish complements the R33's engine bay colour scheme and pairs well with other black-finished engine bay components. The powder coat finish also provides corrosion protection for the aluminium tanks and end caps, maintaining the radiator's appearance over the long term.

Why CSF Racing?

CSF Racing is a leading manufacturer of high-performance cooling products, trusted by professional race teams and performance enthusiasts worldwide for their engineering quality and thermal performance. Their exclusive B-Tube technology and multi-louvered fin designs represent genuine engineering innovations that provide measurable improvements in cooling efficiency. CSF's application-specific radiators are designed to the correct dimensions and connection points for each vehicle, ensuring a direct-fit installation without modification. For R33 GT-R and GTS owners who demand the best cooling performance available for their platform, CSF is the benchmark choice.

Perfect For:

• 1994-1998 Nissan Skyline GT-R R33 (BCNR33) builds with modified RB26DETT requiring improved cooling
• R33 GTS (ECR33) RB25DET builds wanting upgraded radiator for track or high-power use
• R33 GT-R track day builds where sustained high-power operation demands improved heat rejection
• R33 builds replacing a failed or leaking factory radiator with a performance upgrade
• Anyone wanting CSF's B-Tube technology and all-aluminum construction for their R33 Skyline

Perfect For: 1994-1998 Nissan Skyline GT-R (BCNR33) and GTS (ECR33) builds requiring CSF high-performance all-aluminum radiator for improved cooling capacity, B-Tube heat transfer efficiency, and black finish aesthetics.

Pro Tip: Flush your cooling system completely before installing the new radiator — old coolant contains corrosion inhibitor breakdown products and scale that can coat the inside of the new aluminium core and reduce its heat transfer efficiency from day one. A clean system with fresh coolant gets the most out of the CSF radiator's B-Tube technology.

2-Row 42mm | B-Tube | Black: All-aluminum. Multi-louvered fins. 1994-1998 R33 GT-R (BCNR33) and GTS (ECR33). Not for R32 or R34. 16.7 lbs. Flush system before installation.

Keep your R33 GT-R cool under pressure with CSF 7230B — 2-row 42mm all-aluminum core, B-Tube technology for 15% improved heat transfer, multi-louvered fins, black finish.