HKS Transfer Oil Cooler for GZEA14H Toyota GR Corolla [27002-AT001]
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HKS Transfer Oil Cooler for GZEA14H Toyota GR Corolla
The HKS Transfer Oil Cooler for GZEA14H targets a known weak point of the Toyota GR Corolla on track: under continuous high load, the transfer switches the car to 2WD to protect itself from overheating. HKS answers with a kit built around a high-load, high-flow electric oil pump, a dedicated pump controller, an oil filter and a transfer cooler pipe. It is aimed at owners doing repeated circuit sessions; a GR Corolla that only sees the street is unlikely to need it, and the estimated 8 hour installation with bumper area modifications is a real commitment.
Design and Performance
- HKS tested a GR Corolla at Fuji Speedway with and without the kit. Without the cooler, transfer oil temperature was still rising when the test was stopped at approximately 150 degrees C; with the cooler installed, the rise settled at around 125 degrees C. These are HKS test figures for that session, and results on other cars and tracks will vary. On cars equipped with the transfer protection cancel program, HKS notes that full-time 4WD remains available during circuit driving.
Features
- High-load, high-flow electric oil pump driven by a dedicated HKS pump controller
- Controller monitors pump current and drops into standby when current rises above the rated value
- Inline oil filter to keep the circulating transfer oil clean
- Kit supplies the transfer cooler pipe, oil pump, pump controller, oil filter, mounting bracket, and a set of hoses, wiring and small hardware
- Pump controller wiring and operation adapt to cars with or without the transfer protection cancel program
Specifications
- Recommended oil: Stock transfer oil or HKS G900 75W-90 gear oil
- Maximum oil viscosity: 75W-90
- Recommended pump operating temperature: Oil above 60 degrees C
- Standby check cycle: Pump runs 3 seconds every 30 seconds
- Estimated installation time: 8 hours
Applications
- Toyota GR Corolla: GZEA14H | 2023-2025 | G16E-GTS
Notes
- Support for the transfer protection cancel function depends on the production date and software of each car, and some vehicles do not have it. Confirm your GR Corolla build date with Bulletproof Automotive before ordering.
- Wiring and operation of the pump controller differ depending on whether the vehicle has the cancel program
- HKS warns that using the transfer protection cancel program may void the vehicle warranty, so check your warranty terms first
- Installation of the Transfer Oil Cooler for GZEA14H requires modification around the bumper reinforcement, intercooler air guide and undercover duct, and HKS estimates 8 hours of labor
- HKS lists the kit as compatible with the MORIZO Edition and the 2025 facelift model
- Do not use oil thicker than 75W-90, which HKS warns can overload the system
Frequently Asked Questions
- Will the Transfer Oil Cooler for GZEA14H work with the transfer protection cancel function on my car? It depends on the car. HKS states that the cancel function only works on vehicles equipped with the appropriate factory program, and that support varies by production date. The pump controller is wired differently on cars with and without the program. Send your GR Corolla build date to Bulletproof Automotive before ordering so the correct setup can be confirmed.
- Why does the GR Corolla need a transfer oil cooler? HKS explains that the GR Corolla transfer switches to 2WD during continuous high-load driving to prevent overheating. In HKS testing at Fuji Speedway, oil temperature without a cooler was still climbing at approximately 150 degrees C, while the Transfer Oil Cooler for GZEA14H held it at around 125 degrees C.
- What oil should be used with the cooler kit? HKS recommends the stock transfer oil or HKS G900 75W-90 gear oil. Oil thicker than 75W-90 should not be used because it can overload the pump. HKS also recommends running the pump once the oil temperature is above 60 degrees C to avoid overloading it.
- How difficult is the installation? HKS estimates 8 hours of labor, and the job requires modification around the bumper reinforcement, intercooler air guide and undercover duct. The pump controller wiring also depends on whether the car has the cancel program. Bulletproof Automotive recommends professional installation by a shop familiar with the GR Corolla.
- Can the cancel program affect the vehicle warranty? Yes. HKS warns that using the transfer protection cancel program may void the vehicle warranty. Owners should check their warranty terms with the dealer before enabling the program. The HKS cooler kit itself is designed to work on cars with or without the program, with different controller wiring for each.
About HKS
HKS is a Japanese performance engineering brand founded in 1973 and headquartered in Fujinomiya, Shizuoka, with a long-standing reputation for developing high-quality aftermarket parts and motorsport-proven technology for enthusiast and professional applications. Known for innovations in turbocharging and engine performance, HKS produces a broad range of components including exhaust systems, turbo kits, electronics / engine management, and suspension solutions, with product development heavily influenced by decades of involvement in racing disciplines such as circuit time attack, drag, and drifting.
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- Please review the product dimensions carefully to ensure the right fit for your space
- Color may vary slightly due to lighting and screen settings
- Materials and finishes are selected for both durability and visual appeal
- Some items may require simple assembly upon delivery
- Perfect for both everyday use and long-term comfort
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Product Size Guide
Please refer to the general size reference below to better understand how this product may fit into your space. Dimensions may vary slightly depending on the design and materials.
| Category | Small | Medium | Large |
|---|---|---|---|
| Decor & Accessories | Up to 10″ | 10″ – 20″ | 20″+ |
| Tables | Up to 30″ | 30″ – 60″ | 60″+ |
| Seating | 1 Seater | 2–3 Seater | 4+ Seater |
| Storage Units | Compact | Standard | Large Capacity |
| Lighting | Small Fixture | Standard Fixture | Large Fixture |
Note: For exact product dimensions, please refer to the specifications section above. This guide is intended as a general reference only.
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HKS Transfer Oil Cooler for GZEA14H Toyota GR Corolla [27002-AT001]
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