According to John Schinella, Firebird's chief designer, the famed coupe became "more of a thoroughbred in 1985" with a "more aggressive" image and dramatic restyling.
Also new was a V-8 power plant with tuned-port fuel injection that was intended to deliver a 0-60 mph time in about 8.1 seconds.
Engine choices also included the base 151-cid (2.5-liter) four, the fuel-injected 173-cid (2.8-liter) V-6, standard ride/handling package now included all of the components of the former Y99 option except for special tires.
The basic appearance was similar to 1984
Optional in the Trans Am, this 205-hp V-8 produced 270 lb-ft of torque.
The Trans Am displayed
An improved Y99 package included 15 inch wheels.
Diamond spoke wheels were a new option this year.
| Model Number | Style Number | Body Type | Seating | Factory Price | Shipping Weight | Production Total |
|---|---|---|---|---|---|---|
| 223 | 22337 | 2-door Hardtop | 5 | $2781 | 3061 | 90,152 |
| 223 | 22367 | 2-door Convertible | 5 | $2996 | 3346 | 16,960 |
| Model Number | Style Number | Body Type | Seating | Factory Price | Shipping Weight | Production Total |
|---|---|---|---|---|---|---|
| 2F | S87 | 2-door Hardtop Base Firebird - Four | 4 | $8763 | 2866 | 46,644 both 4 & V8 |
| 2F | S87 | 2-door Hardtop Base Firebird - V6 | 4 | $9013 | 2948 | |
| 2F | X87 | 2-door Hardtop SE - V6 | 4 | $11,063 | 2965 | 5,208 |
| 2F | X87 | 2-door Hardtop SE - V8 | 4 | $11,263 | 3145 | |
| 2F | W87 | 2-door Hardtop Trans Am - V8 | 4 | $11,113 | 3107 | 44,028 |
| VIN Code | U or 2 | 5, 9, or W | H (Chev) | G | F | |||
| Cylinders | Four (inline) | 60° V-6 | 90° V-8 | 90° V-8 H.O. | 90° V-8 H.O. | |||
| Valving | Overhead valve | Overhead valve | Overhead valve | Overhead valve | Overhead valve | |||
| Block | Cast-iron | Cast-iron | Cast-iron | Cast-iron | Cast-iron | |||
| Head | Cast-iron | Aluminum | Cast-iron | Cast-iron | Cast-iron | |||
| Bore & Stroke | 4.00 x 3.00 in. | 3.50 x 3.00 in. | 3.74 x 3.48 in. | 4.00 x 3.00 in. | 4.00 x 3.00 in. | |||
| Displacement | 151 cid (2.5 liters) | 173 cid (2.8 liters) | 305 cid (5.0 liters) | 305 cid (5.0 liters) | 305 cid (5.0 liters) | |||
| Compression ratio | 9.0 : 1 | 8.9 : 1 | 9.5 : 1 | 9.5 : 1 | 9.5 : 1 | |||
| Brake H.P. | 88 @ 4400 rpm | 135 @ 5100 | 165 @ 4200 rpm | 190 @ 4800 rpm | 205 @ 4400 rpm | |||
| Torque (lb-ft) | 132-134 @ 2800 rpm | 160-165 @ 3600 rpm | 250 @ 2400 rpm | 240 @ 3200 rpm | 275 @ 3200 rpm | |||
| Main bearings | Five | Four | Five | Five | Five | |||
| Valve lifters | Hydraulic | |||||||
|---|---|---|---|---|---|---|---|---|
| Carburetor | Throttle-body fuel injection | 4-barrel | 4-barrel | Throttle-body fuel Injection | ||||
| Four-speed Transmission | Standard on base Firebird |
| Five-speed Transmission | Standard on Firebird SE |
| Three-speed Turbo-Hydra-Matic | Optional |
| Four-speed Turbo-Hydra-Matic | Optional |
| Final drive ratio with 4-speed | 3.42 : 1 |
| Final drive ratio with V-6 and 5-speed | 3.73 : 1 |
| Final drive ratio with V-8 and 5-speed | 3.23 : 1 |
| Final drive ratio with 3-speed automatic | 3.23 : 1 |
| Final drive ratio with 4-speed automatic | 2.93 : 1 |
| Feature | Firebird | SE | Trans Am |
| Wheelbase | 101.0 in. | 101.0 in. | 101.0 in. |
| Overall length | 189.9 in. | 189.9 in. | 189.9 in. |
| Height | 49.7 in. | 49.7 | 49.7 |
| Width | 72.4 | 72.4 | 72.4 |
| Front tread | 60.7 | 60.7 | 60.7 |
| Rear tread | 61.6 | 61.6 | 61.6 |
| Tires | P195/75R14 SBR BSW | P205/70R14 SBR BSW | P205/70R14 SBR BSW |
| Steering | Recirculating ball | ||
|---|---|---|---|
| Front suspension | Modified MacPherson struts with coil springs between lower control arm and X-member | ||
| Rear suspension | Torque arm/track bar with coil springs | Torque arm/track bar with coil springs and anti-sway bar | |
| Brakes | Front disc, rear drums | ||
| Ignition | Electronic | ||
| Body construction | Unit | ||
| Fuel tank | 15.9 gal | ||
Introduced on Nov. 8, 1984
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