555 Engineering GR Corolla Transfer Case (AWD) Cooler Track Development

Start 0:00
Stock Car Limp Mode 10:08

Track testing of the 555 Engineering Transfer Case (AWD) Cooler, now available for order on our website.

In our extensive instrumented testing, the Transfer Case was by far the hottest component in the GR Corolla drivetrain and likely the primary thermal limiting component in the AWD system.

This is similar to the Focus RS system (FoRS PTU = GRC transfer case; FoRS RDU = GRC ITCC).

Video also shows thermal difference of the GR Corolla transfer case and ITCC (magnetic clutchpack) / rear differential assembly.

Conditions
Track: Laguna Seca
Temperature: Mid 80s

Traction Mode: Expert
AWD Mode: 50:50
Tires: 32 psi square

Cars are stock unless noted otherwise:

Stock (POV) Car; 2023 GRC Core Trim

555 Engineering Oil Cooler
555 Engineering Titanium Brake Shims
Verus Engineering Brake Ducts
Velossa Tech Ram Air Intake
Front Camber Bolts
235/40/18 Michelin Pilot 4S
Seibon CE wing


555 Engineering Development (Lead) Car; 2023 GRC Core Trim

555 Engineering Oil Cooler
555 Engineering Transfer Case (AWD) Cooler
555 Engineering Titanium Brake Shims
Syvecs AWD Controller
Front Camber Bolts
245/40/18 Falken Azenis RT615K+
CE Wing
A few too many air fresheners


A Syvecs AWD Controller is required to run extended sessions as the factory controller infers the Transfer Case temperature (no physical OEM sensor) and in factory form cannot sense mechanical cooling (thanks Toyota). Also available at www.555engineer.com