A Chronological Guide To All Nissan 240sx Models, Trims, And Chassis Codes

The Nissan 240SX, a rear-wheel-drive sports car produced from 1988 to 1998, holds a special place in automotive history, especially within the drifting and tuning communities. Its affordability, simple mechanics, and potential for modification have made it a legend. This guide provides a detailed chronological breakdown of each model year, trim level, and associated chassis codes, enabling you to identify and understand the nuances of each generation.

The S13: 1989-1994 (North America)

The S13 chassis represents the first generation of the 240SX in North America. It’s characterized by its pop-up headlights (except the later LE coupe) and generally lighter curb weight compared to the S14. Understanding the subtle differences between the model years and trims within the S13 family is crucial for any 240SX enthusiast.

1989-1990 240SX

The initial years of the S13 featured the KA24E engine, a 2.4-liter, single overhead cam (SOHC), 12-valve inline-four. This engine produced around 140 horsepower and 152 lb-ft of torque. While not a powerhouse, it was reliable and responsive, making it a good starting point for modification.

Chassis Codes: Hatchback - RS13, Coupe - KS13. The "R" in RS13 denotes a fastback (hatchback) body style. The "K" denotes the coupe body style.
Trims: Base and SE. The SE model typically included features like alloy wheels, upgraded interior trim, and often a limited-slip differential (LSD), although the presence of the LSD can vary and should be verified.
Key Features: Pop-up headlights, analog gauges (early models), relatively simple interior.
Potential Issues: Rust (especially in areas with road salt), timing chain noise (KA24E), and worn-out suspension components due to age.

1991-1994 240SX

A significant change occurred in 1991 with the introduction of the KA24DE engine. This 2.4-liter, dual overhead cam (DOHC), 16-valve inline-four offered improved performance, producing approximately 155 horsepower and 160 lb-ft of torque. The KA24DE is a more robust engine with better tuning potential compared to the KA24E.

Chassis Codes: Hatchback - RS13, Coupe - KS13. The chassis codes remained the same despite the engine upgrade, highlighting that the fundamental chassis design didn't change.
Trims: Base, LE (Coupe only), and SE. The LE trim, introduced later, offered a luxurious package with features like leather seats and upgraded sound system. The LE coupe *did not* have pop-up headlights, differentiating it visually from other S13 coupes.
Key Features: KA24DE engine, digital gauges (some models), slightly revised interior trim.
Potential Issues: Same as the 1989-1990 models, but with potential timing chain guide wear issues specific to the KA24DE. Oil consumption can also be a concern in high-mileage KA24DE engines.

Important Note: The S13 generation was never officially sold in North America after 1994. Any 1995-1998 S13 you encounter in North America would have been imported, likely a Japanese-market 180SX (which shares the S13 chassis and many components). These imported models often came with the turbocharged SR20DET engine, a popular swap in North America.

The S14: 1995-1998 (North America)

The S14 chassis marked a significant departure in styling from the S13. It featured a more rounded and mature design, with fixed headlights and a generally larger overall size. The S14 is often divided into two main styling groups: the "Zenki" (1995-1996) and the "Kouki" (1997-1998).

1995-1996 (Zenki) 240SX

The 1995 and 1996 models are referred to as "Zenki," which translates to "early period." These models are characterized by their more subtle front-end styling compared to the Kouki models. They retained the KA24DE engine.

Chassis Code: S14. There are no specific sub-designations like RS13 or KS13 for the S14 based on body style as only a coupe was offered in North America.
Trims: Base and SE. The SE trim continued to offer upgraded features like alloy wheels, a rear spoiler, and potentially a limited-slip differential.
Key Features: Fixed headlights (Zenki style), revised interior design, improved chassis rigidity compared to the S13.
Potential Issues: Same as the 1991-1994 S13 KA24DE, with emphasis on timing chain guide wear and oil consumption. Rust remains a concern, especially in areas with harsh winters. Power steering fluid leaks are also common.

1997-1998 (Kouki) 240SX

The 1997 and 1998 models are known as "Kouki," meaning "late period." They received a significant facelift, most notably a redesigned front bumper, headlights, taillights, and a different hood. The Kouki models are generally considered more desirable due to their updated aesthetics.

Chassis Code: S14. The chassis code remained S14 despite the facelift.
Trims: Base and SE. The SE trim continued to be the higher-spec option.
Key Features: Fixed headlights (Kouki style), redesigned front and rear fascias, slightly revised interior trim compared to the Zenki.
Potential Issues: Similar to the Zenki models, with the added concern of potential paint fade or clear coat peeling on the newer body panels.

Understanding Chassis Codes in Context

The chassis code is more than just a series of letters and numbers. It provides critical information about the vehicle's lineage and specifications. Let's break down what these codes mean:

"S" - Denotes a Nissan Silvia derivative. The 240SX is based on the Nissan Silvia, which was sold in Japan and other markets with different engine options (including the SR20DET).
"13" or "14" - Represents the generation of the chassis. The S13 is the first generation, and the S14 is the second generation 240SX sold in North America.
"R" (in RS13) - Indicates a hatchback (fastback) body style.
"K" (in KS13) - Indicates a coupe body style.

By understanding these codes, you can quickly identify the body style and generation of a 240SX, even without seeing the entire car. This is particularly useful when sourcing parts or researching specific modifications.

Engine Swaps and Common Modifications

The 240SX is a favorite among tuners and modifiers, and engine swaps are a common upgrade. The most popular swap is the SR20DET, a turbocharged 2.0-liter engine from the Japanese-market Silvia. The SR20DET offers significantly more power than the stock KA24 engines, making it a highly desirable upgrade. Other swaps include the Toyota 1JZ and 2JZ engines, as well as various V8 options.

Beyond engine swaps, common modifications include:

Suspension Upgrades: Coilovers, sway bars, and adjustable control arms are popular upgrades to improve handling.
Brake Upgrades: Larger rotors, multi-piston calipers, and stainless steel brake lines improve stopping power.
Exhaust Systems: Aftermarket exhaust systems increase horsepower and improve the engine's sound.
Forced Induction (Turbocharging/Supercharging): Adding a turbocharger or supercharger to the KA24 engine can significantly increase horsepower.

Conclusion

The Nissan 240SX is a versatile and rewarding car to own and modify. By understanding the different models, trims, and chassis codes, you can make informed decisions when buying, maintaining, or modifying your 240SX. Remember to thoroughly research any modifications before undertaking them, and always prioritize safety. With its rich history and passionate following, the 240SX will continue to be a legend for years to come. Happy wrenching!