Mishimoto Heat Exchanger MMHE-F80-15 – BMW S55 M2 Competition / M3 / M4 (F8x)

OVERVIEW

Air-to-water intercooling transfers heat out of the charge air more efficiently than a conventional front-mount setup, but it needs a heat exchanger at the front of the car to dump that heat. The S55 in the F8X M cars packs a serious punch thanks to its A2W system, and while BMW's engineers laid solid foundations, Mishimoto saw room to improve on the factory heat exchanger.

Mishimoto started by eliminating the plastic components, replacing the end tanks and the inlet and outlet ports with durable aluminum. The dual-pass flow through the core was retained for maximum cooling while the core was expanded into the available space: a 42 mm thick core, extended 150 mm in height, for a 60% increase in core volume and a 180% increase in fin surface area. Intercooler coolant capacity rises by 0.6 gallons. The result is a 10°F drop in global intercooling temperatures over the stock unit.

Because the heat exchanger sits front and center in the M3 and M4's cooling stack it is exposed to road debris, so Mishimoto supplies a stainless-steel stone guard to protect the fins. A variable fin pitch across the lower 12 rows of the core keeps airflow moving to DCT-equipped cars' transmission cooler. The heat exchanger carries the Mishimoto Lifetime Warranty.

SPECS

• Direct fit for the 2015-2020 BMW M3, M4 and M2 Competition (S55)
• 10°F drop in global intercooler coolant temperatures over stock, per Mishimoto testing
• 60% increase in core volume over stock
• 180% increase in external fin surface area over stock
• 42 mm thick core, extended 150 mm in height
• Increases intercooler coolant capacity by 0.6 gallons (2.3 L total system capacity)
• Dual-pass core flow configuration
• Variable fin-pitch design across the lower 12 rows for improved airflow to the DCT cooler
• Full aluminum, TIG-welded construction with aluminum end tanks and ports
• Includes a durable stainless-steel stone guard for protection against road debris
• Single row
• Mishimoto rates the install as Medium difficulty
• Mishimoto Lifetime Warranty

PARTS INCLUDED

• (1) Mishimoto Performance Heat Exchanger
• (1) Stainless-steel stone guard
• (1) Magnetic drain plug
• (1) CARB EO sticker
• Mounting hardware pack

TECH RESOURCES

Additional Parts Required

• Coolant. Mishimoto's installation guide requires coolant to refill the intercooler circuit at the end of the job; it is not supplied with the heat exchanger. Speed Logic does not currently stock it — source BMW-specification coolant from your dealer or parts supplier.
• A drain bucket for the coolant released when the auxiliary cooler is disconnected, plus installer-supplied hand tools.

Installation

• Mishimoto MMHE-F80-15 Performance Heat Exchanger installation guide (PDF) (hosted by Speed Logic)

PART NUMBER

• MMHE-F80-15 — Performance Heat Exchanger

VEHICLE APPLICATIONS