Trans Am/Formula and LS1 Specs
The 5.7L LS1 introduced leading-edge technologies to the grand tradition of the GM small-block V8, including all-aluminum construction, and a thermoplastic intake manifold. Measured by mass, package size, performance or cost to the customer, the 5.7L LS1 matches the world’s best overhead cam V8s. With this new small block, those who claimed cam-in-block engines could not meet the demands of a new decade, or increasingly stringent emissions standards, were proven patently wrong. 1999 Formula and Trans Am drivers got an underrated 305 horsepower and 335 lb-ft of torque at their beck and call...standard, bone stock off the showroom floor.
Stock Specifications
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Overview Pontiac Firebird Formula and Trans Am: Configuration: rear-drive, front-engine two-door coupe and convertible Construction: full unitized steel Body material: steel, reinforced plastic Manufacturing location: Boisbriand, Quebec, Canada Key competitors (according to General Motors): Domestic: Ford Mustang GT, Chevrolet Camaro Z28 (sister platform) Import: Toyota Celica GT, Mitsubishi Eclipse GS-T/GS-X |
Engine 5.7L V8 (LS1)
Type: 5.7-liter OHV L4 Block material: aluminum Displacement (cu in / cc): 346 / 5670 Bore x stroke (in / mm): 3.90 x 3.62 / 99 x 92 Cylinder head material: aluminum Valvetrain: overhead valve, 2/cyl Ignition system: coil near plug Fuel delivery: sequential port fuel injection Compression ratio: 10.1:1 Horsepower (hp @ rpm): 305 @ 5200/325 @ 5200 (WS6) Torque (lb-ft @ rpm): 335 @ 4000/350 @ 4000 (WS6) Recommended fuel: 91 octane Maximum engine speed (rpm): 6000 Emission control system: catalytic converter/EGR Estimated fuel economy (mpg city / hwy / combined): manual: 19 / 28 / 22 automatic: 18 / 26 / 21 |
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Transmission
6 spd man
/ 4 spd auto
Gear ratios (:1): First: 2.66 / 3.06 Second: 1.78 / 1.63 Third: 1.30 / 1.0 Fourth: 1.00 / 0.70 Fifth: 0.74 / ---- Sixth: 0.50 / ---- Reverse: 2.90 / 2.29 Final drive ratio: 3.23:1 / 3.42:1 |
Chassis/Suspension
Front: SLA/coil over monotube gas-charged shocks, tubular 30-mm stabilizer bar with links Rear: Salisbury axle with torque arm, trailing arm, track bar, coil springs, 19-mm stabilizer bar Steering type: power, rack and pinion Steering ratio: 14.4:1 Steering wheel turns, lock-to-lock: 2.28 Turning circle, curb-to-curb (ft / m): left: 37.75 / 11.5; right: 40.1 / 12.2 Brakes Type: power-assisted four-wheel vented discs with four-wheel ABS Diameter (in / mm): front: 11.9 / 302 vented discs; rear: 12 / 305 vented discs |
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Wheels/Tires
Standard: bright silver 16-inch five-spoke cast aluminum Optional: chrome 16-inch five-spoke cast aluminum Optional, Trans Am: high-polished 17-inch cast aluminum Tire size and type: Standard Formula / TA: P245/50ZR16 Goodyear Eagle RSA speed-rated, all-weather Optional Formula / TA: P245/50ZR16 Goodyear Eagle GSC speed-rated, high-performance Optional (with WS6 package only): P275/40ZR17 Goodyear Eagle F1 speed-rated |
Curb weight (lbs / kg):
Coupe: auto: 3517 / 1595 manual: 3495 / 1585 Convertible: auto: 3627 / 1645 manual: 3605 / 1635 Weight distribution (front / rear): 55 / 45; Trans Am Coupe: 56 / 44 |
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Interior
Seating capacity (front / rear): 2 / 2 Head room (in / mm): Front:37.2 / 945 convertible: 38.7 / 983 Rear:35.2 / 894 convertible: 39.4 / 1001 Leg room (in / mm): Front:43.0 / 1092 Rear:28.8 / 732 Shoulder room (in / mm): Front:57.4 / 1458 Rear: 55.8 / 1417 convertible: 43.5 / 1105 Hip room (in / mm): Front:52.8 / 1341 Rear:45.9 / 1166 convertible: 43.7 / 1110 |
Capacities
Interior volume (cu ft / liters): front: 53.1 / 1504 rear: 30.9 / 875 Cargo volume (cu ft / liters): 12.9 / 365 rear of first seat with second seat down: 33.7 / 954 Fuel tank capacity (gals / liters): 16.5 / 63 Engine oil / filter (qts / liters): 5.5 / 5.2 Engine coolant (qts / liters): Manual: 11.9 / 11.3 Auto: 11.8 / 11.2 |