Forge PolarCooler Chargecooler Radiator Upgrade for BMW B48 and B58 Engines
Stop heat soak, keep intake temps low and power consistent with the Forge Motorsport PolarCooler chargecooler radiator for BMW B48 and B58 engines. This is the go-to BMW charge cooler radiator upgrade for fast road and track use, delivering significantly improved cooling performance on tuned and stock cars alike. If you drive a BMW M140i, M240i, 340i, 440i, 120i, 125i, 220i, 230i, 320i or 330i on the F-series platform, this uprated chargecooler rad is the direct-fit solution for reliable, repeatable performance.
Why upgrade your BMW B48 or B58 chargecooler radiator
Modern ECU tuning and spirited driving quickly overwhelm the small OEM chargecooler radiator, causing high intake air temperatures, timing pull and power loss. The Forge PolarCooler uses a high-efficiency core and greater water volume to reduce inlet temps and resist heat soak, so your BMW B48 or B58 makes strong, consistent power run after run.
Key features and benefits
- Massive cooling upgrade - over 100 percent extra capacity via an 18 fpi louvre super tech cooling core for maximum heat rejection
- Direct replacement for the OEM chargecooler radiator - locates in the factory position for a clean, hassle-free install
- Triple pass water flow - ensures the entire core surface is utilised for outstanding cooling efficiency
- Proven intake temperature drop - inlet temps lowered by 20°C in three back to back dyno runs
- Much greater system volume - 17 litres vs OEM 7.71 litres helps keep temps stable over longer periods
- Hand fabricated end tanks with anti-corrosion black powder coat for durability and long life
- Designed, developed and manufactured in Great Britain with Forge’s worldwide lifetime warranty
Real-world results
We have installed and used this Forge PolarCooler on our own builds and customer cars, and the improvement to intake temps and on-road consistency is exactly what B48 and B58 owners want. Customers have been genuinely happy with the performance, particularly on tuned M140i, M240i, 340i and 440i models where the OEM radiator struggles.
Compatible BMW models
- BMW 1 Series F20 and F21 LCI from 09/2015 onwards - 120i, 125i, M140i
- BMW 2 Series F22 and F23 LCI from 09/2016 onwards - 220i, 230i, M240i
- BMW 3 Series F30, F31, F34, F35 LCI from 09/2014 onwards - 320i, 330i, 340i
- BMW 4 Series F32, F33, F36 LCI from 05/2016 onwards - 420i, 430i, 440i
Dimensions
OEM radiator: 576 mm x 495 mm x 27 mm
Forge PolarCooler: 530 mm x 471 mm x 68 mm
Installation and fitting
Estimated install time is around 4 hours. As a direct-fit replacement, it mounts in the OEM position and integrates with the factory chargecooler system.
Want professional fitting in the UK We offer expert installation at Nforcd in Warwickshire. Request a fitting quote at Sales@nforcd.com.
What this upgrade delivers
- Lower intake air temperatures on B48 and B58 engines
- Reduced heat soak for repeatable performance on road and track
- Improved efficiency for tuned and stock BMWs
- A robust, UK-made solution backed by a lifetime warranty
Common search terms
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