Why does the factory GT-R reserve tank cause overheating issues during track use?

The factory tank's limited capacity makes it prone to cavitation after sustained full-throttle driving, and cavitation accelerates coolant temperature rise, which is the specific problem Top Secret's larger tank was designed to solve.

Does the larger capacity alone solve the overheating problem, or is there more to it?

Capacity is only part of it; Top Secret also redesigned the tank's internal structure, and that internal redesign is what actually suppresses the overheating tendency rather than volume by itself.

How do I check coolant level with this tank without opening it?

The tank includes a built-in level gauge, so coolant level can be checked visually at a glance instead of removing the cap to look inside.

Is there a functional difference between the buffed and gold anodized finish options, or is it purely cosmetic?

The finish choice is cosmetic; both the buffed aluminum and gold anodized aluminum versions use the same 2.3-liter capacity and internal structure, so the decision comes down to appearance under the hood.

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Description

Top Secret Reserve Tank for R35 Nissan GT-R

The Top Secret R35 GT-R reserve tank exists to fix a real problem with the factory setup: the stock tank’s small capacity leaves it prone to cavitation after sustained full-throttle runs, and once cavitation starts, coolant temperature climbs fast. Top Secret addressed it by building a 2.3-liter aluminum tank, larger than even Nissan’s own SPEC-V unit, and redesigning the internal structure rather than just scaling up the stock tank’s shape. That internal redesign is what actually suppresses the overheating tendency, not just the added volume alone. It comes with a level gauge built in, so checking coolant level is a glance instead of pulling a cap mid-session. It’s available in a buffed aluminum or a gold anodized finish, depending on what you’re running under the hood.

Features

2.3-liter capacity (larger than Nissan’s factory SPEC-V reserve tank)
Redesigned internal structure
Reduces coolant temperature rise under sustained load
Addresses cavitation caused by the factory tank’s limited capacity during full-throttle driving
Built-in level gauge for at-a-glance coolant level checks
Available in buffed aluminum or gold anodized aluminum finish

Specifications

Capacity: 2.3L
Material: Aluminum
Finish Options:
- Buffed aluminum
- Gold anodized aluminum

Applications

Nissan GT-R: CBA-R35, DBA-R35, EBA-R35, 4BA-R35 | 2008-2025

Frequently Asked Questions

Why does the factory GT-R reserve tank cause overheating issues during track use? The factory tank’s limited capacity makes it prone to cavitation after sustained full-throttle driving, and cavitation accelerates coolant temperature rise, which is the specific problem Top Secret’s larger tank was designed to solve.
Does the larger capacity alone solve the overheating problem, or is there more to it? Capacity is only part of it; Top Secret also redesigned the tank’s internal structure, and that internal redesign is what actually suppresses the overheating tendency rather than volume by itself.
How do I check coolant level with this tank without opening it? The tank includes a built-in level gauge, so coolant level can be checked visually at a glance instead of removing the cap to look inside.
Is there a functional difference between the buffed and gold anodized finish options, or is it purely cosmetic? The finish choice is cosmetic; both the buffed aluminum and gold anodized aluminum versions use the same 2.3-liter capacity and internal structure, so the decision comes down to appearance under the hood.

About Top Secret

Top Secret Co., Ltd. (株式会社トップシークレット, Kabushiki-gaisha Toppu Shīkuretto) is a renowned Japanese automobile tuner and parts manufacturer, founded by automotive engineer and driver Kazuhiko “Smokey” Nagata. The company is widely recognized for its expertise in tuning, aftermarket parts, body kits, and performance engineering. Top Secret’s product range includes aero components, exterior and interior parts, engine upgrades, exhaust systems, chassis, brakes, suspension, and powertrain enhancements. In addition to its products, Top Secret is also famous for its high-speed Wangan runs, as well as its involvement in professional drifting, circuit racing, and drag racing.

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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Top Secret Reserve Tank for R35 Nissan GT-R

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Top Secret Reserve Tank for R35 Nissan GT-R

Features

Specifications

Applications

Frequently Asked Questions

About Top Secret