GENERATION_03 [AH/AT]

// THE ARCHITECTURE

The 3rd Generation Civic (Chassis Code: AH/AT), released in 1984, introduced the "Wonder Civic" design concept.

This generation represents the transition from mechanical approximation to digital precision. It was the first time Honda applied Formula 1 technology (PGM-FI) to a mass-market economy car. The design favored tall glass and a truncated "Kammback" tail for aerodynamic efficiency.

// THE HEART (POWERTRAIN)

"The Birth of Injection"

Engine Code: EW3 / EW4 (D15A3) Type: Inline-4 SOHC (PGM-FI) Displacement: 1488cc

In 1985, the Si (Sport Injected) trim arrived. The carburetor was deleted. In its place was PGM-FI (Programmed Fuel Injection), technology derived directly from Honda’s F1 program.

• The Logic: An ECU (8-bit computer) monitored intake pressure, engine speed, and temperature to inject the precise amount of fuel needed.

• The Result: Instant throttle response. No choke to pull on cold mornings. No stumbling in corners.

• The Output:

  • Horsepower: 91 hp @ 5,500 rpm.

  • Torque: 93 lb-ft @ 4,500 rpm.

  • Context: In a car that weighed 1,900 lbs, 91 hp felt electric.

// THE RITUAL (TRANSMISSION)

"The Short Throw"

The Si received a specific 5-speed manual transaxle with closer ratios to keep the small engine in its power band.

• The Code: L3 Transaxle.

• Final Drive: 4.4:1 (Aggressive gearing for acceleration).

• The Feel: This was the era where "Honda Shifter Feel" became the benchmark. The throw was short, mechanical, and clicked into place like a bolt-action rifle.

// THE EVOLUTION (THE CRX Si) 

"The Sibling Rivalry"

We cannot discuss the Gen 3 Civic Si without acknowledging its 2-seater sibling, the CRX Si. They shared the same chassis and engine, but the CRX was shorter and lighter.

• Plastic Body Panels: The CRX used plastic fenders and lower cladding to save weight.

• The Cult: While the Civic Si (Hatchback) was the practical choice, the CRX Si became the autocross legend.

• Legacy: The Gen 3 Si established the "Red Line" aesthetic—red pin-striping on the bumpers and specific "Si" sport seats that are still coveted today.

// SYSTEM SPECIFICATIONS

[POWERTRAIN]

• Engine Code: EW3 / D15A3

• Displacement: 1488 cc

• Induction: PGM-FI (Multi-Point Fuel Injection)

• Redline: 6,500 rpm

[CHASSIS_DYNAMICS]

• Curb Weight: ~1,940 lbs (Civic Si Hatch)

• Suspension (Front): Torsion Bar Strut

• Suspension (Rear): Beam Axle with Panhard Rod

• Brakes (Front): Vented Disc

• Brakes (Rear): Drum

[ROLLING_STOCK]

• Wheels: 13-inch or 14-inch Alloy (Phone Dial style)

• Tires: 185/60R14 (Performance Radial)

• Bolt Pattern: 4 x 100