HONDA CRX

Feature	1st Gen (1983–1987)	2nd Gen (1988–1991)
Chassis Code	AS (varies by trim)	EF6, EF7, EF8
Base Engine	1.3L EV (Carb) / 1.5L EW (PGM-FI)	1.5L D15B (Twin Carb)
Performance Engine	1.6L ZC (DOHC)	1.6L B16A (DOHC VTEC)
Peak Power (Top Trim)	~135 PS (ZC)	160 PS (B16A)

1st Generation: Ballade Sports CR-X (1983–1987)

The JDM first-generation CR-X was launched in July 1983, emphasizing lightweight agility.

• Initial Engines: The lineup debuted with the 1.3L EV-type (carbureted) and the 1.5L EW-type (featuring PGM-FI).
• The Si Arrival: In November 1984, the high-performance "Si" model was introduced, powered by the 1.6L ZC-type DOHC engine. This engine served as the performance benchmark for the generation.

2nd Generation: CR-X (1988–1991)

The second-generation JDM CR-X introduced the iconic EF chassis codes and moved to the D-series and B-series engine families.

• EF6 (1.5X): Used the 1.5L D15B engine. The JDM 1.5X frequently utilized twin-carburetor induction, designed for a balance of efficiency and weight, with models often weighing under 900 kg.
• EF7 (Si): Equipped with the 1.6L DOHC ZC engine. This was a refined version of the DOHC engine from the 1st generation.
• EF8 (SiR): Introduced in September 1989, this model featured the revolutionary 1.6L B16A engine. This engine utilized Honda’s VTEC (Variable Valve Timing and Lift Electronic Control) system, allowing it to produce 160 PS.

Key Differences in JDM Specification

1. Induction Strategy: While export markets moved quickly toward universal fuel injection, the JDM market retained twin-carburetor setups for mid-range models like the 1.5X to maintain lower entry prices and mechanical simplicity.
2. VTEC Revolution: The move from the ZC DOHC engine in the 1st generation to the B16A VTEC in the late-model EF8 represented a major leap in power density—moving from 130 PS in the ZC to 160 PS in the B16A.
3. Engine Architecture: The transition from the E-series in the first generation to the D-series and B-series in the second generation provided a more robust and modular platform that facilitated the high-performance tuning culture.