Technical Specifications Of The Se Trim Level For The Nissan 240sx Coupe


Technical Specifications Of The Se Trim Level For The Nissan 240sx Coupe

The Nissan 240SX, a rear-wheel-drive sports coupe produced from 1989 to 1998, holds a special place in automotive history, particularly within the drifting and tuning communities. While variations existed across model years and sub-models, the SE trim level offered a specific blend of features and performance that differentiated it from the base model. This guide delves into the technical specifications of the 240SX SE coupe, aiming to provide a comprehensive understanding of its mechanical, electrical, and structural aspects.

Engine and Drivetrain

The heart of the 240SX SE (and most models) lay in its inline-four cylinder engines. The specific engine varied depending on the model year. The S13 generation (1989-1994) initially featured the KA24E engine, while later models and the S14 generation (1995-1998) adopted the KA24DE.

KA24E (1989-1990.5 S13)

The KA24E was a 2.4-liter, single overhead camshaft (SOHC) engine. Its key specifications included:

  • Displacement: 2389 cc (145.8 cu in)
  • Bore x Stroke: 89 mm x 96 mm (3.50 in x 3.78 in)
  • Compression Ratio: 9.1:1
  • Horsepower: 140 hp (104 kW) @ 5600 rpm
  • Torque: 152 lb-ft (206 N⋅m) @ 4400 rpm
  • Fuel Delivery: Electronic Fuel Injection (EFI)

The SOHC design simplified the valve train, contributing to reliability. The 96mm stroke, longer than the bore, characterized it as an undersquare engine, typically resulting in strong low-end torque. The EFI system, managed by a Nissan Electronic Control System (ECS), ensured efficient fuel delivery and emissions control.

KA24DE (1990.5-1998 S13 & S14)

The KA24DE was an upgraded version of the KA24E, featuring a dual overhead camshaft (DOHC) design. Key specifications included:

  • Displacement: 2389 cc (145.8 cu in)
  • Bore x Stroke: 89 mm x 96 mm (3.50 in x 3.78 in)
  • Compression Ratio: 9.5:1 (S13), 9.0:1 (S14)
  • Horsepower: 155 hp (116 kW) @ 5600 rpm (S13), 140 hp (104 kW) @ 5600 rpm (S14)
  • Torque: 160 lb-ft (217 N⋅m) @ 4400 rpm (S13), 155 lb-ft (210 N⋅m) @ 4400 rpm (S14)
  • Fuel Delivery: Electronic Fuel Injection (EFI)

The DOHC configuration allowed for improved valve timing and lift, contributing to increased horsepower and torque, particularly in the S13 version. The S14 KA24DE, while still DOHC, saw a slight decrease in horsepower likely due to emissions regulations and revised engine management. The higher compression ratio in the S13 KA24DE also aided in power output.

Both engines were known for their reliability and responsiveness, albeit lacking the high-revving nature of some other sports car engines. Their robust construction made them popular choices for modification and forced induction.

Transmission

The 240SX SE came standard with a 5-speed manual transmission. An optional 4-speed automatic transmission was also available. The manual transmission was a robust unit, well-suited to handling the engine's power output and frequently modified for increased strength to withstand higher horsepower levels. Gear ratios varied slightly between model years. Specific gear ratios depended on the production year but generally offered a good balance between acceleration and highway cruising.

The final drive ratio also played a significant role in overall performance. Typically, the SE trim level had a final drive ratio that prioritized acceleration. It's worth noting that swapping final drive ratios was a common modification to further tailor the car's performance characteristics.

Differential

The rear differential was a crucial component in delivering power to the wheels. The SE trim, in its standard configuration, usually featured an open differential. This meant that power was distributed to the wheel with the least amount of traction, which could lead to wheel spin under hard acceleration or in slippery conditions. However, many owners upgraded to a limited-slip differential (LSD) for improved traction and handling. Factory LSDs were occasionally offered, or aftermarket units from brands like KAAZ or Cusco were installed.

Suspension and Brakes

The 240SX SE boasted a fully independent suspension, contributing to its handling prowess.

Front Suspension

The front suspension utilized MacPherson struts with coil springs and lower control arms. A sway bar was also present to reduce body roll during cornering. The SE trim, depending on the year, might have had slightly stiffer springs and shocks compared to the base model, enhancing handling performance. The geometry of the front suspension played a critical role in the car's steering response and stability. Parameters like caster, camber, and toe-in were carefully tuned to provide optimal handling characteristics.

Rear Suspension

The rear suspension also employed a multi-link design with coil springs and shocks. The multi-link setup allowed for more sophisticated control of wheel movement, providing better handling and ride quality compared to simpler suspension designs. Again, the SE trim might have featured slightly stiffer components compared to the base model. The rear suspension geometry, similar to the front, was carefully engineered to optimize handling and traction. Adjustable aftermarket suspension components were very popular, allowing drivers to fine-tune the car's handling characteristics to their specific preferences.

Brakes

The 240SX SE came equipped with disc brakes on all four wheels. The front brakes typically featured larger rotors and calipers compared to the rear, reflecting the greater braking force required at the front of the car. Anti-lock brakes (ABS) were offered as an option. The braking system was generally considered adequate for the car's performance level. Many owners upgraded to larger brake rotors and calipers, often sourced from other Nissan models, to improve braking performance and reduce brake fade under demanding conditions.

Chassis and Body

The 240SX utilized a unibody construction, providing a good balance of strength and weight. The chassis was relatively lightweight, contributing to the car's nimble handling. The SE trim often included subtle aerodynamic enhancements, such as a rear spoiler or side skirts, to improve stability at higher speeds.

Body panels were primarily steel. The SE trim often had unique badging or trim pieces to differentiate it from the base model. Rust was a common issue, particularly in areas prone to moisture or road salt exposure. Regular maintenance and rust prevention measures were essential to preserving the integrity of the chassis and body.

Electrical System

The 240SX SE operated on a 12-volt electrical system. The wiring harness was relatively straightforward. The ECS (Electronic Control System) managed various engine functions, including fuel injection, ignition timing, and emissions control. Power windows, power mirrors, and a premium sound system were standard SE features, adding to the electrical load. Troubleshooting electrical issues often required a multimeter and a wiring diagram. Many owners upgraded the electrical system to accommodate aftermarket accessories, such as high-powered audio systems or auxiliary lighting.

Interior

The interior of the SE trim level was designed with a focus on driver comfort and functionality. Compared to the base model, the SE typically featured upgraded upholstery, such as cloth sport seats with additional bolstering. A leather-wrapped steering wheel and shift knob were common additions. Power windows, power locks, and cruise control were also standard features. The instrument panel provided essential information, including speed, engine RPM, fuel level, and coolant temperature. The SE trim often had unique interior trim pieces to differentiate it from the base model.

Conclusion

The Nissan 240SX SE coupe presented a well-rounded package of performance, handling, and features. While the specific specifications varied slightly across model years and sub-models, the core components remained consistent. The robust engine, independent suspension, and lightweight chassis made it a popular choice for enthusiasts. Understanding these technical specifications provides valuable insight into the car's design, capabilities, and potential for modification. The car's continued popularity in the tuner community underscores the enduring appeal of its balanced performance and inherent potential.

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