do88 Front intercooler radiator, BMW G-Series / Toyota GR Supra A90

Enhance the performance of your B58 Gen 2 engine with the do88 Performance front-mount heat exchanger!

B58 engine compared to the F80 M3/M4 S55
The B58 engine shares similarities with the S55 engine found in the F80 M3/M4 models, as both engines have a water-to-air intercooler paired with heat exchangers (water radiators) at the front of the car. These radiators cool the water circulating in the intercooler, and the water dissipates heat from the charge air before it enters the engine. The main difference lies in the design of the B58's water-to-air intercooler, which is integrated into the intake manifold, while the F80 S55's intercooler is a separate unit mounted on top of the engine.

Challenges of the B58 charge air cooling system A common problem with tuned B58 engines is the rapid absorption of heat from the supercharger air cooling system, especially during track days.
High intake air temperatures will cause the ECU to reduce power output or put the car into limp mode. Even spirited driving can prompt the ECU to pull the timing and decrease power output due to the high intake temperature.

Our solution
It is clear that this system requires increased cooling capacity to prevent heat soaking. Part of our solution is our do88 Performance Front Mount Heat Exchanger. The do88 Performance Front Mount Heat Exchanger is designed to provide increased cooling capacity, preventing heat absorption. It includes:

• Core volume 80% larger than the original (OE) radiator.
• Dual-row core, 48 mm thick, increasing the cooling surface area by 36%.
• Four-pass arrangement, allowing water to pass through the radiator four times instead of two, thus maximizing the use of the core surface area.
• Slightly greater ambient wing height of 5 mm (compared to the 4.4 mm of the original equipment), ensuring good airflow to the engine radiator despite the increased core thickness.
• Constructed entirely of aluminium, with durable TIG welded end tanks.
• Increased fluid capacity (2.6 liters more) for optimal heat dissipation.

Facility
Our heat exchanger includes mounting points for the stock transmission cooler and both stock rock guards. Some trimming of the stock plastic radiator mounting frame is required to accommodate the larger do88 Performance front-mount heat exchanger (see installation instructions).