Will the Transfer Oil Cooler for GZEA14H work with the cancel function on my car?

It depends on the build date. HKS lists transfer protection cancel support on left-hand drive GR Corolla models, including US cars, built from August 2024. Earlier cars run the kit without the cancel function, and the pump controller is wired differently for them. Send your build date to Bulletproof Automotive before ordering.

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, transfer oil without a cooler was still climbing at about 302°F, while the Transfer Oil Cooler for GZEA14H held it at around 257°F.

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 is above 140°F, and the controller drops into standby if pump current climbs too high.

How difficult is the installation?

HKS estimates 8 hours of labor, and the job requires modification to the bumper reinforcement, intercooler air guide and undercover duct. The controller wiring also depends on whether the car has the cancel program. Bulletproof Automotive recommends a professional 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, so owners should check their warranty terms with the dealer before enabling it. The HKS cooler kit itself works on cars with or without the program.

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Description

HKS Transfer Oil Cooler for GZEA14H Toyota GR Corolla

HKS’s Transfer Oil Cooler for GZEA14H Toyota GR Corolla targets a known weak point of the car on track: under continuous high load, the transfer switches the car to 2WD to protect itself from overheating. HKS answers with a dedicated pipe-type cooler fed by a high-load, high-flow electric oil pump. It is aimed at owners doing repeated circuit sessions; a street-only GR Corolla is unlikely to need it.

Development and Testing

HKS ran 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 about 302°F (150°C); with the cooler, the rise settled at around 257°F (125°C). The cooler runs on its own circuit and takes no capacity from the coolant, engine oil or intercooler. Results on other cars and tracks will vary.

Features

Dedicated pipe-type transfer cooler, independent of the coolant, engine oil and intercooler systems
High-load, high-flow electric oil pump run by an HKS controller with AUTO, FULL AUTO and MANUAL modes
Overcurrent protection that drops the pump into standby, retrying 3 seconds every 30 seconds
On cars with the cancel program, selecting TRACK mode starts the pump within 1 minute of startup
Banjo oil outlet with a PT1/8 plug hole for oil changes or a temperature sensor

Specifications

Recommended oil: Stock transfer oil or HKS G900 75W-90 gear oil
Maximum oil viscosity: 75W-90
Recommended pump operating temperature: Oil above 140°F (60°C)
Included: Cooler pipe, oil pump, pump controller, oil filter, bracket, hose, harness and small parts set
Shipping Weight: 13.7lb (6.2kg)

Applications

Toyota GR Corolla: GZEA14H | 2023-2025 | G16E-GTS

Notes

Transfer protection cancel support depends on build date. HKS lists support on left-hand drive cars, including US models, built from August 2024, and earlier cars do not support it. Confirm your GR Corolla build date with Bulletproof Automotive before ordering.
On a car without the cancel program, do not connect the 4WD mode select switch connector; HKS warns that doing so disables 4WD
Installation of the Transfer Oil Cooler for GZEA14H requires modification to the bumper reinforcement, intercooler air guide and undercover duct, and HKS estimates 8 hours of labor
HKS recommends switching the system on just before sporty driving

Frequently Asked Questions

Will the Transfer Oil Cooler for GZEA14H work with the cancel function on my car? It depends on the build date. HKS lists transfer protection cancel support on left-hand drive GR Corolla models, including US cars, built from August 2024. Earlier cars run the kit without the cancel function, and the pump controller is wired differently for them. Send your build date to Bulletproof Automotive before ordering.
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, transfer oil without a cooler was still climbing at about 302°F, while the Transfer Oil Cooler for GZEA14H held it at around 257°F.
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 is above 140°F, and the controller drops into standby if pump current climbs too high.
How difficult is the installation? HKS estimates 8 hours of labor, and the job requires modification to the bumper reinforcement, intercooler air guide and undercover duct. The controller wiring also depends on whether the car has the cancel program. Bulletproof Automotive recommends a professional 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, so owners should check their warranty terms with the dealer before enabling it. The HKS cooler kit itself works on cars with or without the program.

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.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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HKS Transfer Oil Cooler for GZEA14H Toyota GR Corolla [27002-AT001]

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HKS Transfer Oil Cooler for GZEA14H Toyota GR Corolla

Development and Testing

Features

Specifications

Applications

Notes

Frequently Asked Questions

About HKS

Reviews