The Racing Lab Auxiliary Radiator is a high-performance cooling upgrade designed for BMW G-Series (B58) and Toyota GR Supra A90/A91 platforms. Engineered to improve oil temperature stability under high-load and track conditions, it enhances overall thermal management and long-term engine reliability.

Compared to the factory auxiliary cooling system, the Racing Lab radiator features an enlarged high-efficiency core with approximately 30% increased cooling capacity, improving heat dissipation during sustained driving.

Based on real-world datalog testing (ambient temperature: 28°C, BM3 Stage 2 high-load conditions), the Racing Lab system demonstrates a measurable reduction in oil temperature:

• OEM peak oil temperature: 126.8°C
• Racing Lab peak oil temperature: 117.0°C
• Up to ~9.8°C reduction under load

This reduction helps prevent excessive heat buildup, maintain oil viscosity, and improve engine protection during aggressive driving or repeated laps.

Constructed from full aluminium with a high-efficiency core design, the radiator delivers improved durability and thermal performance. Designed as a direct replacement, it integrates seamlessly with factory mounting locations.

Key Features

• Enlarged core design (~30% increased cooling capacity vs OEM)
• Proven real-world testing: up to 9.8°C lower oil temperatures
• OEM 126.8°C → Racing Lab 117.0°C (BM3 Stage 2 test)
• High-efficiency aluminium construction for improved durability
• Increased core thickness for better heat dissipation
• Supports track use, high boost and sustained load conditions
• Direct bolt-on fit for BMW B58 & Toyota Supra A90/A91

Compatible with:
• BMW G-Series B58 models (G20 / G22 / G30 / G42 etc.)
• Toyota GR Supra A90 / A91 (B58 Engine, 2020+)