AIRTEC Motorsport Auxiliary Radiator for Honda Civic FK2 Type R

Technical Data

Following an extensive development process, AIRTEC Motorsport are proud to launch our auxiliary radiator/turbo cooler kit aimed at FK2 Civic Type R owners who require the ultimate cooling package to maintain steady running temperatures on track or fast road use.

The Challenge
When modifying the FK2 Civic Type R to increase power and torque, an unavoidable by-product is the additional heat level that’s transferred to the car’s cooling system, which ultimately leads to hotter operating temperatures. During sustained hard use, this can become a substantial issue, as temperatures can increase enough to trigger the ECU’s safety features, reducing torque or even putting the car into a limp mode. 

The Solution
Developed in-house at AIRTEC HQ in the UK we designed an auxiliary radiator to focus on reducing heat from the hottest part of the engine; the turbo. This radiator is plumbed directly into the cooling circuit that flows coolant to and from the turbo, therefore offering an immediate reduction in temperature to help counteract the effects of the coolant being ‘superheated’ as it passes through the turbo before it passes back into the radiator. This helps reduce the whole engine’s cooling level, as less heat into the radiator equates to less heat in the car’s overall operating temperature, allowing the car to maintain a steadier temperature for longer during hard use.

The radiator fits neatly behind the fog light (requires removal) and utilises our bespoke CAD-modelled air duct to force cold air through the radiator. To create a flow path and further improve cooling, air then exits via the inner arch liner (requires cutting). A pre-cut mesh shield is supplied for both the front and rear to protect the radiator from road debris damage.

This can fit with our intercooler, replacement inspection panel and oil cooler to create the ultimate cooling package. The comprehensive kit also features laser-cut and powder-coated brackets, high-quality Pro Hoses silicone lines as well as all fixtures and fittings, and detailed fitting instructions.

Tested on Track
20th June 2025 – Cadwell Park Circuit
Test car fitted with air filter and Stage 1 remap producing a dyno proven 375bhp
Fitted with AIRTEC Motorsport oil cooler and AIRTEC Motorsport auxiliary radiator/turbo cooler
Oil temperature data logged to indicate overall operating temperature via OBD port using Torque Pro app data recording and downloaded to PC.

Run 1 – 10.00am – Ambient Temperature: 24°C – 15 minute session – Maximum Oil Temperature: 106°C 
Run 2 – 10:45am – Ambient Temperature: 25°C – 20 minute session – Maximum Oil Temperature: 112°C  
Run 3 – 11:30am – Ambient Temperature: 27°C – 15 minute session – Maximum Oil Temperature: 112°C 
Run 4 – 12:00pm – Ambient Temperature: 28°C – 20 minute session – Maximum Oil Temperature: 114°C  
Run 5 – 2.00pm – Ambient Temperature: 29°C – 15 minute session – Maximum Oil Temperature: 118°C 
Run 6 – 2:45pm – Ambient Temperature: 30°C – 20 minute session – Maximum Oil Temperature: 117°C 
Run 7 – 3:30pm – Ambient Temperature: 28°C – 15 minute session – Maximum Oil Temperature: 113°C 

Driver Comments:
“This was an extremely hot day and car coped very well. Before the auxiliary radiator and oil cooler were installed I would normally get approximately 5 to 6 laps, which is about 8 to 10 minutes of hard use before the oil temperature rose to around the 126 to 128°C. With the coolers installed, I can run at least 10 to 14 laps, which is over 20 minutes of hard use, and oil temperatures don’t normally go above 115°C.

Also a major advantage is that I can repeat that all day long, whereas before I found that once the temperature of the oil got really hot it would normally not cool down enough for the rest of the day,  so it meant I ended up doing only 3 to 4 laps before the temperature rose again, as the oil never fully cooled down and seemed to heat back up quicker.”

Features:

• Designed and developed specifically for the FK2 Civic Type R
• Improves both cooling capacity and ability
• Utilises our bespoke CAD-modelled air duct
• Ducting channels air in and allows it to exit via arch liner
• Tested on track and proven to work
• Bespoke laser-cut and powder coated brackets
• High-quality Pro Hoses silicone lines
• Fits with our intercooler and oil cooler kit to create the ultimate cooling package
• Comprehensive kit with all fixtures, fittings and instructions

AIRTEC part no: ATRADHON02