Vehicle Specifications: 1987 Pontiac Trans Am GTA

Engine

Type…………..………………………………...………….…..Alum head, Iron Block V8

Valvetrain………………………………….………...……OHV, hydraulic roller 2V/cyl.

Displacement………………………………………...…….….…....................... 357cu. in.

Bore x stroke……………………………………………………………4.040" x 3.480"

Compression ratio…....………………………………………...…………………...10.7:1

Horsepower…………...……………………………..……...…..420 hp @ 5000 rpm (est)

Torque………………...…………………………...……….....460 lb-ft @ 4100 rpm (est)

Maximum engine speed……………………………….……………………….6000 rpm

Fuel injection…………..……………...GM P4 multi-port, batch fire; Accel SuperRam

Recommended fuel……...………………………....Premium pump unleaded, 93 octane

Chassis & Body

Curb weight……………………………………………………………..............3594 lbs.

Layout…………………………………………………………Front engine / rear drive

Body / frame……………………….…………………..…….unit steel, front sub-frame

Brakes, f/r……………………...............................….Vented disc, Drum; vacuum assist

Wheels………………………………...……………………………………..alloy, 16 x 8

Tires…………………………………….....BFGoodrich Comp T/A ZR    255 50 ZR16 

Steering………………………………….………….…………...std gearbox, pwr assist

Suspension f/r…..…modified strut, lwr control arms / 3 link, torque arm, std shocks

Scales

All weights are with vehicle normally loaded but without driver.

Front weight

1956 lbs / 54.4%

Left Front weight    Right Front weight

966 lbs / 26.8%             990 lbs / 27.5%

Left Side                    Right Side

1776 lbs / 49.4%               1818 lbs / 50.5%

Left Rear weight    Right Rear weight

810 lbs / 22.5%         828 lbs / 23.0%

Rear weight

1638 lbs / 45.5%

Total Vehicle Weight

3594 lbs.

Drivetrain

Transmission type…………………4-speed electronic automatic (4L60-E)

Gear / Ratio / Overall

1……………………………….3.06 / 11.41

2………………..……………….1.76 / 6.56

3……………..………………….1.00 / 3.73

4………………..……………….0.70 / 2.61

Final drive ratio…………..…...……3.73:1

Estimated  Fuel Economy

Normal driving………………………………...………………………………18 mpg

EPA city / highway…………...….………………………………………..15 / 23 mpg

Fuel capacity…………………………………………………………………16.1 gal.

Performance, Acceleration

Standing 1/4 mile………………….………………...........………….13.1 @ 109 mph