Koyorad Performance Radiator: Mazda RX-7 FB S3 1983-1985
Koyorad Performance Radiator: Mazda RX-7 FB S3 1983-1985 is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
MASSIVE RANGE
Over 20,000 performance & automotive SKUs for European, JDM, American, Korean and more
NATIONWIDE FAST SHIPPING
Quick dispatch across Australia with reliable tracked delivery
AUSSIE SUPPORT & EXPERTISE
Local customer service and technical assistance from our team of enthusiasts
Koyorad Performance Radiator: Mazda RX-7 FB S3 1983-1985
Koyo Performance Radiator – Mazda RX-7 FB S3 1983–1985
Application: Mazda RX-7 | FB (2D Coupe) | S3 1983–1985 incl. GSL-SE | Manual Transmission (AT requires external transmission cooler)
Part Number: HH063146 / KH063144
The FB RX-7 is a classic — lightweight, rotary-powered, and endlessly tuneable. But decades of engineering progress mean the factory cooling system is one area where a modern upgrade makes an immediate difference. Koyorad's HH Series 48mm radiator was built to address exactly that, featuring an ultra-high fin density core that maximises heat transfer in the FB's compact engine bay.
Unlike generic replacements, this radiator is precision-engineered as a direct-fit performance upgrade for the stock OE plastic/aluminium unit — no modifications, no fabrication, just bolt it in and drive. Koyorad has also integrated an M12 × 1.25 provision on the top tank centre for a low coolant sensor, and the design is compatible with aftermarket temperature gauge sensors via the included accessory fitting.
Built in Koyorad's privately owned Japanese factories, every unit is hand assembled, Nocolok brazed, and TIG welded by hand using the finest aluminium available. Quality is never sacrificed for quantity.
Why Koyorad?
- Precise Tube & Fin Alignment — Strict quality control ensures optimal coolant flow and maximum heat transfer efficiency across the entire core.
- Nocolok Furnace Brazing — All tubes, fins, headers, and brackets are bonded in a state-of-the-art Nocolok furnace, creating a structure that resists vibration, road debris, and the elements.
- Billet Filler Neck — Precision-machined billet filler necks are fitted to every unit for superior strength, durability, and a reliable seal.
- OE-Specific Mounting — Application-specific mounting points for fan shrouds, inlet/outlet hoses, and top/bottom pins ensure a pain-free, no-modification install.
- Hand-Crafted Heliarc Welds — Each radiator is individually Heliarc welded by hand, creating the strongest possible aluminium-to-aluminium bond across all components.
Specifications
| Part Number | HH063146 / KH063144 |
| Core Type | HH Series — Ultra High Fin Density |
| Core Thickness | 48mm |
| Core Dimensions (H × W) | 425 × 557/567mm |
| Tube Pitch | 55/55 × 570mm |
| Inlet / Outlet Diameter | Ø38mm (top & bottom) / Ø17mm (overflow) |
| Construction | All Aluminium, Nocolok Brazed, Heliarc Welded |
| Transmission | Manual (AT requires external transmission cooler) |
| Fan Shroud | Retains OEM mounts |
| Sensor Provision | M12 × 1.25 low coolant sensor (top tank centre) |
| Fitment | Direct bolt-in, no modifications required |
Cross Reference
| Koyorad | HH063146 / KH063144 |
Fitment
| Year | Make | Model | Chassis | Submodel |
|---|---|---|---|---|
| 1983–1985 | Mazda | RX-7 | FB (2D Coupe) | S3 – incl. GSL-SE |
Technical Notes:
- Includes M12 × 1.25 provision for low coolant sensor located on top tank centre.
- Does not include emissions switch provision on driver's side bottom tank.
- Automatic transmission vehicles will require an external transmission cooler.
Sold individually. Lead times may apply — contact us at ModsDirect for availability and shipping estimates.
ModsDirect is an Authorised Australian Distributor of Koyorad Performance Radiators.
Shop with confidence — all Koyorad products sold through ModsDirect are genuine, backed by manufacturer support, and shipped from Australia.
Can I return a product after install?
Once a product has been installed, used or fitted it is no longer returnable.
How long do I have to return a product?
Customers have 7 days inclusive from the day they receive their order to lodge a “Return Request” with ModsDirect. If the return form is approved (notification by email) the item must then be returned within 21 days. All returns must be trackable.
Please note that exchanges, refunds or credits will NOT be processed until the returned product(s) is received by ModsDirect.
Where do items need to be returned to?
After submitting a “Return Request” form, ModsDirect will be in touch via email to confirm details for return.
How do I return items?
All returns must be returned to ModsDirect by courier or post. All returns must be trackable. In some instances, ModsDirect may offer a return label.
What about restocking fees?
All returns will incur a fee of 15%. This is to cover fees incurred by ModsDirect for payment processing and handling. We are at the mercy of paying for services used at our website regardless of whether the order remains completed or reversed.
Who pays for return shipping?
All return shipping costs are the responsibility of the customer. However, if a customer has received the incorrect product, ModsDirect will cover return fees and provide a courier pickup at no cost to the customer.
Exchange, Credit or Refund?
If a customer requests a return, they may be eligible for either an exchange, credit or refund based on the nature of the return and product availability. If refunding, moneys will be returned to the customer via the original payment gateway used at checkout.
Can I drop a return off to ModsDirect?
Sorry, no in-store return option is presently available.
I damaged the packaging during unboxing, can I still return?
Unfortunately not. All packing materials must be in resalable condition for a return. Some minor damages such as a neat cut of a package seal may still be eligible for return. Please include a photo of the packaging with your Return Request form.
By purchasing from ModsDirect you agree to the Return Policy outlined above.
The “Vehicle Fitment” tab found on ModsDirect product listings are to be used as a guide ONLY. ModsDirect does not take responsibility for any misinformation on the Vehicle Fitment tab. The customer must ensure proper and correct fitment on their vehicle prior to ordering. If any errors are found in any product, you are encouraged to inform ModsDirect by clicking here.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
