240sx Coupe Interior Component Dimensions And Material Specifications

The Nissan 240SX, particularly the S13 coupe (1989-1994), achieved legendary status not just for its nimble handling and accessible tuning potential, but also for its surprisingly well-thought-out interior. While often overlooked in favor of discussing engine swaps and drift angles, the 240SX interior presents a fascinating study in late 80s/early 90s automotive design, materials engineering, and ergonomic considerations. This technical guide delves into the dimensions and material specifications of key interior components, offering a detailed look at what makes this often-modified cabin tick.

Dashboard and Instrumentation

The dashboard is arguably the most dominant interior element. It's a complex assembly constructed primarily from injection-molded Acrylonitrile Butadiene Styrene (ABS) plastic, chosen for its good impact resistance, heat deflection temperature, and ability to be molded into intricate shapes. The dimensions vary slightly depending on model year and trim, but generally span approximately 56 inches in width and 18 inches in depth at its deepest point. The height tapers from approximately 10 inches at the base near the firewall to about 4 inches at the leading edge where it meets the windshield. These measurements are approximate and can vary slightly due to manufacturing tolerances and slight variations in submodels.

Material Breakdown: Dashboard

ABS Plastic: As mentioned, the main structural component. Nissan likely used a specific grade of ABS with UV inhibitors to mitigate sun damage and fading. The exact formulation would be documented in Nissan's internal materials specifications, which are not generally publicly available. However, common ABS grades used in automotive interiors possess a tensile strength of around 40-50 MPa and a flexural modulus of 2.0-2.5 GPa.

Vinyl Overlay (SE models): Higher trim levels often featured a thin vinyl overlay on the dashboard surface, providing a more premium feel. This vinyl was typically a Polyvinyl Chloride (PVC) compound, chosen for its durability, ease of cleaning, and cost-effectiveness. Thickness ranged from approximately 0.5 mm to 1.0 mm.

Foam Underlayment: A thin layer of closed-cell foam (typically Polyurethane or Polyethylene) was often applied between the ABS plastic and the vinyl overlay to provide cushioning and prevent the vinyl from stretching or wrinkling. This layer would have been approximately 2-5 mm thick.

Instrumentation: Dials and Gauges

The instrument cluster is a critical part of the dashboard. It includes the speedometer, tachometer, fuel gauge, temperature gauge, and various warning lights. The dimensions of the entire cluster are roughly 12 inches wide and 6 inches high. The gauge faces are made of transparent acrylic or polycarbonate plastic, chosen for their clarity and resistance to scratching. The needles are typically made of lightweight aluminum or plastic. The printing on the gauge faces is done using screen printing or pad printing techniques with specialized inks that are resistant to fading and UV damage.

Seats and Upholstery

The 240SX seats were a key factor in the car's overall comfort. The front seats were bucket seats, providing decent lateral support for spirited driving. The dimensions of the front seats are approximately 21 inches wide, 22 inches deep, and 34 inches high (from the floor to the top of the headrest). The rear seats were a simple bench design, offering limited legroom, particularly in the coupe model. The rear seat dimensions are approximately 50 inches wide, 18 inches deep, and 20 inches high.

Material Breakdown: Seats

Seat Frame: The seat frame is constructed from stamped steel, providing the structural support for the seat. The steel is typically low-carbon steel with a corrosion-resistant coating, such as electrocoating or galvanizing. The thickness of the steel ranges from approximately 1.5 mm to 2.5 mm.

Seat Foam: The seat cushions are made from molded polyurethane foam, providing cushioning and support. The density of the foam varies depending on the location within the seat. Higher-density foam is used in the seat base for better support, while lower-density foam is used in the seat back for greater comfort.

Upholstery Fabric: The upholstery fabric varies depending on the trim level. Base models typically featured a woven cloth fabric made from polyester or nylon. Higher trim levels featured a velour or leather upholstery. The cloth fabric typically has a weight of around 200-300 grams per square meter. Leather upholstery was likely sourced from a reputable supplier like Bridge of Weir or similar and treated for UV and abrasion resistance.

Door Panels

The door panels are another complex interior component, combining aesthetic appeal with functional elements like armrests and door handles. The dimensions of the door panels are approximately 36 inches high and 24 inches wide. They consist of a molded plastic base, typically ABS or polypropylene, covered with upholstery and trim pieces.

Material Breakdown: Door Panels

Plastic Base: Similar to the dashboard, the door panel base is made from injection-molded ABS or polypropylene plastic. Polypropylene offers better impact resistance at lower temperatures, making it suitable for colder climates.

Upholstery Inserts: The door panels typically feature upholstered inserts, matching the seat upholstery. The materials used for these inserts are the same as those used for the seats: woven cloth, velour, or leather.

Armrest Padding: The armrests are padded with polyurethane foam for comfort. The foam is typically a lower density than the seat foam.

Trim Pieces: The door panels also feature various trim pieces, such as chrome or painted plastic accents. These pieces are typically made from ABS or polypropylene plastic and are attached to the door panel using clips or adhesive.

Carpet and Floor Mats

The carpeting in the 240SX is typically a tufted nylon or polypropylene carpet, chosen for its durability and resistance to wear. The carpet is attached to a foam or rubber backing to provide cushioning and sound insulation. The floor mats are made from rubber or carpet and are designed to protect the carpet from dirt and wear.

Material Breakdown: Carpet and Floor Mats

Carpet Fiber: Nylon and polypropylene are common choices due to their wear resistance and stain resistance. Nylon offers better abrasion resistance, while polypropylene is more resistant to moisture and mildew. The fiber weight is typically around 500-700 grams per square meter.

Carpet Backing: The carpet backing is typically made from foam or rubber. Foam provides better cushioning, while rubber is more durable and water-resistant.

Floor Mat Material: Floor mats are typically made from rubber or carpet. Rubber mats are more durable and easier to clean, while carpet mats offer a more luxurious feel.

Steering Wheel

The steering wheel is a critical interface between the driver and the car. The dimensions of the steering wheel are approximately 14 inches in diameter. The steering wheel rim is made from steel or aluminum, covered with a layer of foam and then wrapped in leather or vinyl.

Material Breakdown: Steering Wheel

Steering Wheel Frame: The steering wheel frame is made from steel or aluminum, providing the structural support for the steering wheel. The steel is typically low-carbon steel with a corrosion-resistant coating.

Foam Padding: The steering wheel rim is padded with polyurethane foam for comfort and impact absorption.

Steering Wheel Wrap: The steering wheel rim is wrapped in leather or vinyl. Leather provides a more luxurious feel, while vinyl is more durable and easier to clean. The leather would be treated for UV and wear resistance, as is standard in automotive applications.

Conclusion

The interior of the Nissan 240SX S13 coupe, while seemingly simple, is a carefully engineered environment. The choice of materials, dimensions, and construction techniques reflects a balance between cost, durability, comfort, and aesthetic appeal. Understanding the specifics of these components provides valuable insight for restoration projects, modifications, or simply appreciating the engineering behind this iconic sports coupe. Furthermore, while specific formulations and supplier information remains proprietary, this guide offers a detailed approximation based on common industry practices and available information, giving enthusiasts and amateur engineers a valuable starting point for further investigation and understanding.