do88
do88 high-performance radiator for the intercooler system designed for easy installation in the BMW M3/M4 F8X
The S55 turbo engine powering the BMW M3/M4 F8X uses a top-mounted water-cooled intercooler instead of a “normal” air-cooled intercooler. The coolant in this system has its own separate cooling circuit, consisting of two parallel-connected radiators and a pump. The larger of these two parallel-connected radiators is located at the front of the center cooling module, while the second, smaller one is located in front of the right wheel arch.
The reduction in water temperature in this circuit directly correlates with improved charge air cooling (lower IAT). Therefore, it is important to have high-performance radiators in this system to keep the IAT as low and stable as possible during hard driving. In all tests, it was clearly noted that peak power directly correlates with IAT (Intake Air Temperature).
The final design features a 68mm-thick, double-row core with multi-channel tubing, maintaining the OEM-style single-pass flow layout. This design extends both the height and thickness of the core by 28mm, resulting in an 18% increase in frontal area and a whopping 100% increase in core volume. To accommodate this massive radiator, we designed a beautiful carbon fiber air duct, manufactured with pre-pegged material using the autoclave process. Our radiator is drop-in with the OEM cooling lines.
These improvements, combined with the updated side-mounted radiator, have resulted in a 5°C reduction in IAT.
Significant benefits of the do88 radiator (comparison numbers to stock):
– Increased core volume: 3393 cm3 (1693 cm3), 100% larger!
– Increased frontal area: 499cm2 (423cm2), 18% larger!
– Lower post-intercooler air temperature under the same conditions: 34°C (39°C), 5°C lower!*
– High-efficiency core with 8mm fin height and multi-slot design.
– Multi-channel center pipes
* Measured at 240km/h during full-throttle acceleration from 0-240km/h on the air track. Both tests were performed on the same day under the same conditions.