AIRTEC Motorsport Radiator Upgrade for BMW E9x M3

Technical Data

As part of our expanding BMW product range, AIRTEC Motorsport is proud to launch our replacement uprated radiator for the E90, E92 and E93 M3 models, suitable for track or fast road use.

With huge experience in developing uprated radiators for a variety of modified track and road cars, we chose to create a direct replacement radiator with a larger core to make the most of the space available in the original location.

As a result, our radiator offers a huge capacity increase, thanks to a core that measures 25% bigger than the standard BMW core.

Our lightweight radiator solution also features a tube-and-fin aluminium construction together with welded aluminium end tanks. This design increases the cooling system’s capacity as well as improving its efficiency, allowing it to retain lower running temperatures compared to an original unit during prolonged or hard use. It’s also suited to modified or track orientated vehicles that operate with constant higher temperatures, or for hotter climate countries, where cooling can be an issue.

Designed as a direct replacement item, fitting is a simple process, making it a great addition to improve cooling.

TESTED 
In June 2025, we attended a two day, back-to-back test in order to collect data as part of the track testing programme for our newly developed E9x M3 cooling package; in particular the radiator and power steering cooler. For this, we used our AIRTEC Motorsport demonstrator vehicle, which is equipped with an uprated exhaust system and sports cats, a remap, KW V3 suspension, AP Racing brakes and a semi-slick tyre set up, among other modifications and driven by this season’s Time Attack driver Alan Shepherd. 

The first day would entail data logging with the standard radiator in place, before swapping over to our AIRTEC Motorsport radiator for the next day and repeating the same process. 

Each radiator was run for two track sessions and coolant temperature was measured with an external thermocouple sensor with an advanced sampling rate. With the standard radiator we saw an average temperature of 91.4°C and with the AIRTEC Motorsport aluminium radiator we saw an average of 83.9°C, resulting in an average reduction of 7.5°C or 9% reduction in coolant temperature, the maximum temperature difference being 10.7°C.

Dimensions:
Width: 600mm
Height: 460mm
Depth: 40mm
Capacity: 11.0 litres
Original BMW radiator capacity: 8.8 litres

This cooler makes up part of BMW E9x M3 cooling package, which includes: 

• AIRTEC Motorsport DCT Cooler
• AIRTEC Motorsport Power Steering Cooler
• AIRTEC Motorsport Under Tray
• AIRTEC Motorsport Oil Cooler

Please note: Minor trimming to the plastic mounting trim is required to fit this item, please see here for a guide 

Features:

• Tested and proven to perform during hard use
• Reduced coolant operating temperature by 9%
• 25% increase in capacity over original BMW radiator
• Larger 40mm tube-and-fin core design
• Lightweight aluminium construction
• Improved cooling efficiency
• Connects to original mounts and connectors
• Direct replacement with no cutting or trimming

AIRTEC part number: ATRADBMW8