do88 Front Intercooler Radiator – Toyota GR Supra (A90) / BMW G-Series B58 & B48

OVERVIEW

The B58 and B48 in the GR Supra and BMW G-series cars use a water-to-air charge cooler fed by a front-mounted heat exchanger. Once the car is tuned, that small heat exchanger can't shed the extra heat, intake temperatures rise during repeated pulls, and power drops. The do88 WC-400 replaces it with an all-aluminum unit that has 80 percent more core volume and runs the coolant through four passes instead of two.

The two-row, 48 mm core adds about 36 percent more cooling surface, while a 5 mm fin height keeps air flowing to the engine radiator behind it. The tanks are TIG-welded and the unit holds about 2.6 liters more coolant than stock. It has mounting points for the OE transmission cooler and both factory rock guards. The factory plastic radiator mounting frame does need trimming to fit.

SPECS

• All-aluminum construction with TIG-welded end tanks
• Core volume 80 percent larger than OE
• Two-row core, 48 mm thick; about 36 percent more cooling surface
• Quadruple-pass coolant flow (OE: two-pass)
• 5 mm fin height (OE: 4.4 mm)
• Holds about 2.6 L more coolant than OE
• Mounting points for the OE transmission cooler and both OE rock guards
• Replaces OE 17118666811 (BMW), 16400-WAA03 (Toyota)

PARTS INCLUDED

• 1 × do88 performance heat exchanger (front intercooler radiator)
• 2 × brackets (for the oil cooler and radiator guard)
• 6 × M5 screws
• 6 × zip-ties

TECH RESOURCES

• Required extras: charge-cooler circuit coolant — the do88 unit holds about 2.6 L more than stock. A cutting tool is needed to trim the plastic radiator supports.
• Installation instructions (do88): WC-400 GR Supra / G-series front intercooler radiator installation instructions (PDF)
• Installation notes: remove the front panels, bumper cover and bumper, then drain and remove the OE heat exchanger. Trim the plastic radiator supports at the marked points (upper corners, lower support edge, guard tabs and side brackets), fit the brackets and do88 unit, and re-attach the OE guard with the zip-ties.
• Bleeding: ignition on (engine off), low beams on, climate at max temperature and lowest fan, accelerator to the floor for 10 seconds; the routine runs 10–15 minutes. Top off afterward — trapped air raises intake temperatures.
• B48 cars (330i, 430i, Z4 sDrive30i, Supra 2.0): only for cars with the water-cooled charge cooler.
• Tuning: no tune is required; most useful on tuned cars. Pairs with the Bootmod3 B58 Tune – GR Supra and Bootmod3 B58 Tune – BMW.
• Price is for the item only; labor is not included.

PART NUMBER

• WC-400 — do88 Front Intercooler Radiator, BMW G-Series / Toyota GR Supra A90

VEHICLE APPLICATIONS