CSF High Performance All-Aluminum Radiator for F-Chassis BMW B48B20 / B58B30M0 Engines [7089]

CSF High Performance All-Aluminum Radiator for F-Chassis BMW B48B20 / B58B30M0 Engines [7089]

CSF recognizes that as Gen 1 B58-powered BMWs in the F3x and F2x platforms accumulate mileage and become more accessible, they have become popular choices among tuners, track-day enthusiasts, and weekend warriors. With aging factory components and an increasing number of modified vehicles, demand for motorsport-grade performance parts has grown substantially. To meet the needs of those pushing the limits of the Gen 1 B58, CSF prioritizes advanced cooling solutions. As the industry leader in high-performance BMW cooling, CSF provides F3x and F2x owners with more than just OEM-level reliability. Whether the goal is to build a competitive track car or reinforce a daily driver, the CSF High-Performance Radiator offers unmatched durability and thermal performance for the Gen 1 B58 platform.

Design & Engineering

• CSF has earned a strong reputation for developing the most effective B58 cooling systems available. Drawing on years of industry experience and valuable feedback from customers, race teams, and development partners, CSF continues to lead the way in Gen 1 B58 cooling innovation.
• CSF has observed that as enthusiasts continue to elevate the performance of F-Chassis BMWs, the limitations of the factory radiator have become increasingly apparent. Elevated boost levels and turbocharger upgrades generate excess heat that the OEM cooling system often cannot manage. Combined with the front-mounted heat exchanger, these factors can cause elevated coolant temperatures — especially during track use — potentially triggering limp mode.
• CSF also notes the long-term reliability concerns associated with OEM plastic radiators. Over time, these components are prone to issues such as clogged tubes, damaged fins, and a higher likelihood of tank cracking or gasket failure. As a result, upgrading the factory radiator is essential for maintaining performance and durability.

5mm Core Upgrade

• While the initial 6.5mm fin version of the radiator performed exceptionally well in testing, CSF opted to push the design further. Prior to final production, the radiator was updated with CSF’s latest 5mm fin technology—introduced in late 2023. This revised core configuration delivers greater heat transfer and thermal efficiency than the original prototypes. CSF is confident that this radiator is capable of meeting the extreme demands of motorsport use.

CSF vs OEM

• CSF acknowledges that the original OE radiator from BMW, while generally reliable, utilizes a plastic tank and single-row aluminum core. Although the 4.5mm fin design provided adequate efficiency for a factory part, the system’s limitations are most evident in the 34mm thick, single-row core — restricting overall cooling performance.
• CSF addresses these shortcomings by incorporating its newest 5mm fin technology in the upgraded radiator. These fins expand the heat exchange surface area, increasing cooling efficiency and improving recovery while preserving airflow. The radiator features a significantly larger 2-row, 42mm aluminum core that not only increases coolant capacity but also enhances heat dissipation. CSF’s exclusive B-Tube Technology improves heat transfer by approximately 15% compared to standard oval welded tubes, and the multi-louvered fins maximize airflow for peak thermal performance.
• CSF manufactures the radiator with TIG-welded, 100% all-aluminum construction, boosting structural integrity and longevity. This robust design ensures reliable performance under aggressive driving conditions. Installation is seamless, as the CSF radiator fits directly into the factory location without requiring modifications or cutting.

Features

• 20–25% increase in heat transfer efficiency using CSF’s exclusive 5mm fin technology
• Improved cooling performance to support high-boost, big-turbo builds
• All-aluminum construction for superior durability over OEM plastic tanks
• Designed to work seamlessly with factory or aftermarket heat exchangers
• Whether you’re building a street sleeper or prepping for your next track day, CSF’s Gen 1 B58 Radiator is engineered to handle the heat and then some.
• 2-row – 42mm ultra high-performance core
• Cooling tubes with CSF’s exclusive B-Tube Technology
• New 5mm tall ultra efficient fins with a multi-louvered design for maximum surface area contact
• CNC-machined mounting brackets & OEM style inlet / outlet
• 100% all aluminum TIG-welded construction
• Hand brushed satin finish
• True plug-and-play “drop-in fit”, installation requires absolutely no modifications
• Individually leak & pressure tested
• 2-year limited warranty

Applications

• BMW 230i (with M Sport package): F22, F23 (2016-2021) [2.0L I4 turbo B48B20]
• BMW 330i (with M Sport package): F30, F31, F34, F35 (2015-2019) [2.0L I4 turbo B48B20]
• BMW 340i: F30, F31, F34, F35 (2015-2019) [3.0L I6 turbo B58B30M0]
• BMW 430i (with M Sport package): F32, F33, F36 (2016-2019) [2.0L I4 turbo B48B20]
• BMW 440i: F32, F33, F36 (2016-2019) [3.0L I6 turbo B58B30M0]
• BMW M140i: F20, F21 (2016-2019) [3.0L I6 turbo B58B30M0]
• BMW M240i: F22, F23 (2016-2021) [3.0L I6 turbo B58B30M0]

Notes

• Compatible with xDrive models

About CSF

The Racing & High Performance Division of CSF Inc. is dedicated to designing and producing the world’s most advanced, efficient, and dependable cooling solutions. CSF offers a broad range of state-of-the-art cooling systems, with over 250 distinct applications. These include high-performance all-aluminum direct-fit radiators, intercoolers, and oil coolers, as well as bespoke manufacturing tailored for racecars, power sports, off-road vehicles, marine, and industrial applications. Every cooling solution from CSF is meticulously crafted to ensure optimal engine temperature management, even in the most rigorous driving scenarios. With a legacy spanning over 50 years and more than 40 million cooling units distributed worldwide, CSF is widely regarded as a luminary in the industry.