BMW M57 Water-to-Air Intercooler Kits

BMW M57 Water-to-Air Intercooler Kit — Charge Air Cooling System

FastMotion supplies a complete BMW M57 water-to-air intercooler system for performance build applications. The kit uses an air-to-water heat exchanger to cool the compressed charge air from the turbocharger before it enters the engine, delivering consistent charge air temperatures independent of vehicle speed and ambient airflow. This approach allows compact, flexible mounting within constrained swap application engine bays while maintaining intercooling efficiency under sustained boost conditions.

Kit Contents

The FastMotion M57 water-to-air intercooler kit contains the air-to-water heat exchanger core, hot-side charge air pipe from the turbocharger outlet to the intercooler, cold-side charge air pipe from the intercooler to the intake manifold, the water circuit heat exchanger for the secondary water circuit, water circuit pump, all hose connections and clamps, and full mounting hardware. The system is designed as a complete installation package that does not require custom fabrication work for supported applications.

System Advantages Over Air-to-Air Intercooling

The water-to-air architecture offers significant advantages in swap applications compared to a front-mounted air-to-air intercooler. The heat exchanger can be positioned anywhere within the engine bay and does not require a direct path to ambient airflow, providing far greater installation flexibility. Charge air temperature management is consistent during slow-speed off-road use where ambient airflow is insufficient for effective air-to-air cooling. The water circuit provides a buffer capacity that maintains cooling performance during brief high-load events before the secondary radiator can reject the stored heat.

Frequently Asked Questions

Is a water-to-air intercooler suitable for expedition use?

Yes. The water-to-air system is particularly well suited to expedition and off-road use because its cooling effectiveness is independent of vehicle speed. At slow off-road speeds where a front-mounted air-to-air intercooler provides minimal cooling due to low airflow, the water circuit continues to absorb charge air heat effectively until the secondary water-to-air radiator can reject it to the environment.

Does the intercooler kit require modification to the standard M57 intake system?

The kit replaces the intake routing between the turbocharger outlet and the intake manifold with the charge air pipes and intercooler core. The standard M57 intake manifold connection is retained. No modification to the engine internal components is required. The extent of pipework modification depends on the specific installation and turbocharger position in your build.

What is the maximum boost pressure the intercooler kit supports?

The FastMotion M57 water-to-air intercooler core is sized for the charge air volume of M57 applications in the 250 to 380 bhp range. For builds targeting above 380 bhp with extended high-load operation, a larger core specification may be required. Contact FastMotion with your power target and duty cycle for core sizing guidance before purchase.