Our best-ever airflow kit packages the latest in fan tech - brushless motors. These fans aren't usually available to the aftermarket, they're used by OEs and the military. Our long-standing relationship with Spal and our ability to create a complete solution means we can bring them to Miata owners!
So what's the advantage? First, the fans have a variable speed and an intelligent controller so they can deliver as much or as little airflow is required, from a slight whisper to a hurricane. They're tied into the coolant temperature, so they can anticipate problems and prevent the car from getting hot in the first place. This means less electrical draw and more power available at the wheels when the car is at normal temperature. It also avoids a big startup surge that can drag down your electrical system for a moment or blow fuses. In fact, it's so subtle you may never actually notice when they're running most of the time.
When they're running full tilt, they can pull 3532 CFM. That's more than 30% more than our Stage 2. They don't just flow more in free air, they continue to pull even when trying to pull through multiple heat exchangers. By the time a set of typical slimline fans have stalled out, the brushless units can still move 3000 CFM.
We baselined them against our current Stage 2 Airflow kit and found that it took the car two and a half times longer to get to 119C. Those motors are strong. They're also built to military specifications, so they're highly waterproof and vibration resistant.
Naturally, they're mounted on a custom shroud with bypass flaps. The fans themselves are quite deep. Available only for crossflow radiators at the moment. They will definitely work with our Crossflow. They will probably work with similar crossflows, although we haven't checked and can't guarantee fitment. If you're prepared for some problem-solving, you should be fine.
Certain ECUs such as the Hydra and MS3 can control the fans directly so they do not require the standalone controller. Stock ECUs, MS2 and the FM221 will require the controller. The fans will not work without PWM control of some sort.
This kit will fit with "normal" installs of our turbo kit and front sway bar, but if you have extra / bigger parts in front of the engine (e.g., a giant sway bar) it's a good idea to check clearance. This fan is about 2.5" deep (measured straight / horizontally back) from the fan mounting bosses.
Fitment on a turbo car without a coolant reroute will be challenging and will require modification of the shroud and very tight packaging. We strongly recommend using this fan kit on a car with a reroute.