Pontiac Sunbird

Pontiac Sunbird generations compared: what actually changed

The 2 generation raised ground clearance by 33 mm versus the 1 generation (157 − 124). The 3 generation dropped 12 mm versus the 2 generation (157 − 145) but still sits 21 mm higher than the 1 generation (145 − 124). Peak power jumped 55 hp from the 1 generation ceiling (110 hp) to the 2 generation and 3 generation ceiling (165 hp). Drive flipped from RWD to FWD after 1980 and stayed FWD.

The 2 generation raised ground clearance by 33 mm versus the 1 generation (157 − 124). The 3 generation dropped 12 mm versus the 2 generation (157 − 145) but still sits 21 mm higher than the 1 generation (145 − 124). Peak power jumped 55 hp from the 1 generation ceiling (110 hp) to the 2 generation and 3 generation ceiling (165 hp). Drive flipped from RWD to FWD after 1980 and stayed FWD. Body type flipped from Coupe to Sedan in 1988.

If the question is “Pontiac Sunbird 1980,” that is 1 generation Coupe RWD. If it is “Pontiac Sunbird 1990,” that is 3 generation Sedan FWD. The two cars do not share a driveline.

Which Pontiac Sunbird 3 generation version to buy (1988–1994 Sedan)

Eight FWD Sedan versions, all 145 mm clearance, Independent, spring front, Semi-independent, springorts hélicoïdaux, sem rear, Disc front brakes, Drum rear. Four distinct engines, each with Manual 5 and Automatic 3.

Turbo pair — highest power in the model line

• 2.0 MT 165 hp / 121 kW at 5600 rpm, 237 Nm at 400 rpm, 1985 cm³, 4 Inline, Turbo, Manual 5, FWD. Fuel, injection, compression, bore × stroke, valves per cylinder: not measured.
• 2.0 AT 165 hp / 121 kW at 5600 rpm, 237 Nm at 400 rpm, 1985 cm³, 4 Inline, Turbo, Automatic 3, FWD. Same unmeasured fields.

Specific output: 165 / 1.985 = 83.1 hp per litre. That is the densest 3 generation engine and ties the 2 generation 1985 cm³ Turbo.

Versus the 97 hp 2.0 MT / 2.0 AT: +68 hp (+70%) and +77 Nm (237 − 160). Versus the 110 hp pair: +55 hp and +74 Nm (237 − 163). Versus the 3.1 MT / 3.1 AT: +25 hp but −14 Nm (251 − 237). The Turbo 2.0 wins power; the 3.1 wins torque and displacement.

Choose the Turbo 2.0 MT if the point of a Sunbird is the highest hp figure in this catalogue. Choose the Turbo 2.0 AT if the same 165 hp is required with Automatic 3 instead of Manual 5. The gearbox is the only measured difference between those two names.

97 hp naturally aspirated pair — lowest 3 generation power

• 2.0 MT 97 hp / 71 kW at 4800 rpm, 160 Nm at 3600 rpm, 1998 cm³, 4 Inline, 2 valves per cylinder, No boost, Central injection (single-point or single- point), compression 8.8, bore × stroke 86 × 86, fuel 92, Manual 5, FWD.
• 2.0 AT 97 hp / 71 kW at 4800 rpm, 160 Nm at 3600 rpm, same engine, Automatic 3, FWD.

Specific output: 97 / 1.998 = 48.5 hp per litre. That is 34.6 hp/l below the Turbo 2.0 (83.1 − 48.5). Peak arrives 800 rpm earlier than the 110 hp 2.0 (4800 vs 5600) and 800 rpm earlier than the Turbo (5600). Torque 160 Nm is 3 Nm below the 110 hp engine and 91 Nm below the 3.1.

Choose this 2.0 MT or 2.0 AT only if fuel 92 and the lowest 3 generation output are acceptable. It is not the “same 2.0” as the 110 hp or 165 hp cars: displacement is 13 cm³ larger than the Turbo 1985 cm³ unit (1998 − 1985), power is 68 hp lower.

110 hp naturally aspirated pair — middle 2.0

• 2.0 MT 110 hp / 81 kW at 5600 rpm, 163 Nm at 3200 rpm, 1998 cm³, 4 Inline, 2 valves per cylinder, No boost, Central injection (single-point or single- point), compression 9.2, 86 × 86, fuel 80, Manual 5, FWD.
• 2.0 AT 110 hp / 81 kW at 5600 rpm, 163 Nm at 3200 rpm, same engine, Automatic 3, FWD.

Specific output: 110 / 1.998 = 55.1 hp per litre. Versus the 97 hp 2.0: +13 hp (+13%), +3 Nm, compression 9.2 vs 8.8 (+0.4), peak torque 400 rpm earlier (3200 vs 3600), fuel 80 vs 92. Versus the Turbo 2.0: −55 hp, −74 Nm, No boost vs Turbo. Versus the 3.1: −30 hp, −88 Nm (251 − 163).

The extra 13 hp over the 97 hp 2.0 MT / 2.0 AT is the entire measured gain of this pair. Compression and fuel grade also change. If the choice is only among naturally aspirated 2.0 names, the 110 hp 2.0 MT (or 2.0 AT) is the stronger of the two.

3.1 pair — only 6-cylinder 3 generation Sunbird

• 3.1 MT 140 hp / 103 kW at 4400 rpm, 251 Nm at 3200 rpm, 3135 cm³, 6 V-shaped, 2 valves per cylinder, No boost, Distributed injection (multi-point), compression 8.8, 89 × 84, fuel 95, Manual 5, FWD.
• 3.1 AT 140 hp / 103 kW at 4400 rpm, 251 Nm at 3200 rpm, same engine, Automatic 3, FWD.

Specific output: 140 / 3.135 = 44.7 hp per litre — the lowest density in the 3 generation, 38.4 hp/l below the Turbo 2.0. Displacement is 1137 cm³ larger than the 1998 cm³ 2.0 (3135 − 1998) and 1150 cm³ larger than the Turbo 1985 cm³ unit. Torque 251 Nm is the highest figure in the entire Pontiac Sunbird catalogue (next is 237 Nm on the Turbo 2.0, then 183 Nm on the 1 generation 2.5). Peak power at 4400 rpm is 1200 rpm below the Turbo and the 110 hp 2.0 (5600 − 4400).

Choose 3.1 MT or 3.1 AT when torque and cylinder count matter more than hp per litre. You give up 25 hp to the Turbo 2.0 and gain 14 Nm. You gain 30 hp and 88 Nm over the 110 hp 2.0, and 43 hp and 91 Nm over the 97 hp 2.0. Fuel is 95, versus 80 or 92 on the naturally aspirated 2.0 engines; Turbo 2.0 fuel is not measured.

3 generation shortlist

Three different engines share the name 2.0 MT (165 / 110 / 97 hp) and three share 2.0 AT. Matching the name without the horsepower figure points at the wrong car.

Which Pontiac Sunbird 2 generation version to buy (1981–1988 Coupe)

Eight FWD Coupe versions, 157 mm clearance — the highest of the three generations. Chassis labels match the 3 generation: Independent, spring; Semi-independent, springorts hélicoïdaux, sem; Disc / Drum.

1.8 naturally aspirated — 88 hp

• 1.8 MT 88 hp / 65 kW, 1796 cm³, 4 Inline, No boost, Manual 5, FWD. rpm, torque, fuel, injection: not measured.
• 1.8 AT 88 hp / 65 kW, same engine, Automatic 3, FWD.

Specific output: 88 / 1.796 = 49.0 hp per litre. Power sits 9 hp below the 3 generation 97 hp 2.0 (97 − 88) and 2 hp below the 2 generation 90 hp 2.0.

1.8 Turbo — 150 hp

• 1.8 MT 150 hp / 110 kW, 1796 cm³, 4 Inline, Turbo, Carburetor, Manual 5, FWD.
• 1.8 AT 150 hp / 110 kW, same engine, Automatic 3, FWD.

Specific output: 150 / 1.796 = 83.5 hp per litre — the highest density in the whole Sunbird line, 0.4 hp/l above the 1985 cm³ Turbo (83.1). Versus the 88 hp 1.8 MT / 1.8 AT: +62 hp (+70%) from the same 1796 cm³. Versus the 3 generation Turbo 2.0: −15 hp (165 − 150) from 189 cm³ less displacement (1985 − 1796).

Choose this 1.8 MT 150 hp if the 2 generation Coupe is the target and 83.5 hp/l matters more than the extra 15 hp of the later 2.0 Turbo. The 1.8 Turbo is Carburetor; the 3 generation Turbo injection is not measured.

2.0 naturally aspirated — 90 hp

• 2.0 MT 90 hp / 66 kW, 1985 cm³, 4 Inline, No boost, Manual 5, FWD.
• 2.0 AT 90 hp / 66 kW, Automatic 3, FWD.

Specific output: 90 / 1.985 = 45.3 hp per litre. Versus the 88 hp 1.8: +2 hp and +189 cm³. Versus the 3 generation 97 hp 2.0: −7 hp at almost the same capacity (1998 vs 1985). Versus its own Turbo sibling: −75 hp (165 − 90).

2.0 Turbo — 165 hp (same peak as 3 generation)

• 2.0 MT 165 hp / 121 kW at 5600 rpm, 237 Nm at 400 rpm, 1985 cm³, 4 Inline, Turbo, Manual 5, FWD.
• 2.0 AT 165 hp / 121 kW at 5600 rpm, 237 Nm at 400 rpm, Automatic 3, FWD.

This is the same 165 hp / 237 Nm package as the 3 generation Turbo 2.0 MT / 2.0 AT. What changes around it: Coupe vs Sedan, 157 mm vs 145 mm clearance (−12 mm on the later car). Power does not change.

2 generation shortlist

The 2 generation is the only generation with two Turbo displacements. The 150 hp 1.8 MT / 1.8 AT is 15 hp short of the 165 hp 2.0 MT / 2.0 AT Turbo and 0.4 hp/l denser. The naturally aspirated 1.8 MT 88 hp and 2.0 MT 90 hp differ by 2 hp; the 2.0 is not a meaningful power step over the 1.8 unless displacement itself is the criterion. For a 2 generation Coupe with Automatic, every AT is Automatic 3.

Which Pontiac Sunbird 1 generation version to buy (1975–1980 Coupe)

Six RWD Coupe versions, 124 mm clearance — 33 mm below the 2 generation and 21 mm below the 3 generation. Manuals here are Manual 4, not Manual 5. All have 2 valves per cylinder where measured. This is the only RWD Sunbird in the data.

2.3 pair — lowest power in the model

• 2.3 MT 78 hp / 57 kW at 4200 rpm, 2287 cm³, 4 Inline, No boost, Carburetor, Manual 4, RWD.
• 2.3 AT 78 hp / 57 kW at 4200 rpm, Automatic 3, RWD. Torque: not measured.

Specific output: 78 / 2.287 = 34.1 hp per litre. Versus the weakest 2 generation car (88 hp 1.8 MT): −10 hp despite +491 cm³ (2287 − 1796). Versus the 3 generation 97 hp 2.0: −19 hp.

Buy 2.3 MT or 2.3 AT only if the requirement is a 1975–1980 Coupe RWD and 78 hp is accepted as the floor of the line.

2.5 pair — only 1 generation engine with measured torque

• 2.5 MT 92 hp / 68 kW at 4800 rpm, 183 Nm at 3200 rpm, 2471 cm³, 4 Inline, No boost, Distributed injection (multi-point), compression 8.3, 101.6 × 76.2, fuel 95, Manual 4, RWD.
• 2.5 AT 92 hp / 68 kW at 4800 rpm, 183 Nm at 3200 rpm, Automatic 3, RWD.

Specific output: 92 / 2.471 = 37.2 hp per litre. Versus the 2.3 MT: +14 hp, +184 cm³ (2471 − 2287), injection instead of Carburetor, and the only 1 generation torque figure (183 Nm). That 183 Nm is 54 Nm below the 3 generation 3.1 (251 − 183) and 54 Nm below the Turbo 2.0 as well (237 − 183). Versus the 3 generation 97 hp 2.0: −5 hp with 473 cm³ more (2471 − 1998).

Choose 2.5 MT if a 1 generation car is required and 14 hp plus a measured 183 Nm over the 2.3 is the reason. Fuel 95 matches the later 3.1 MT.

3.8 pair — largest engine, tied for 1 generation peak power

• 3.8 MT 110 hp / 81 kW, 3800 cm³, 6 V-shaped, No boost, Carburetor, Manual 4, RWD. rpm and torque: not measured.
• 3.8 AT 110 hp / 81 kW, Automatic 3, RWD.

Specific output: 110 / 3.800 = 28.9 hp per litre — the lowest density in the catalogue, 15.8 hp/l below the 1 generation 2.5 (37.2 − 28.9) and 54.6 hp/l below the 2 generation 1.8 Turbo (83.5 − 28.9). Displacement is 1329 cm³ larger than the 2.5 (3800 − 2471) and 1513 cm³ larger than the 2.3 (3800 − 2287). Power matches the 3 generation 110 hp 2.0 MT exactly (110 hp / 81 kW) from 1802 cm³ more (3800 − 1998).

Choose 3.8 MT or 3.8 AT for cylinder count and capacity in a RWD Coupe, not for efficiency of displacement. The 110 hp figure equals the later 2.0, not the 140 hp 3.1 or the 165 hp Turbo.

Specs table: every Pontiac Sunbird version

Performance, mpg, dimensions, reliability

0–100 km/h: not measured on all 22 versions. Top speed: not measured. City, highway, and mixed consumption: not measured. A mpg ranking cannot be built from this catalogue.

Kerb weight: not measured. Gross weight: not measured. Weight per horsepower: not measured. Fuel tank: not measured. Wheel sizes: not measured. CO2 and eco class: not measured.

Ground clearance is measured: 124 mm (1 generation), 157 mm (2 generation), 145 mm (3 generation). Problems and reliability are not in the data; the only mechanical split that is measured is Turbo versus No, Carburetor versus Central injection (single-point or single- point) versus Distributed injection (multi-point), and Manual 4 / Manual 5 versus Automatic 3.

Which version to choose

Need the most horsepower in a Pontiac Sunbird. 3 generation 2.0 MT 165 hp Turbo or 2 generation 2.0 MT 165 hp Turbo (or the matching 2.0 AT). Same 165 hp, 121 kW, 237 Nm, 1985 cm³. Decide by body: Sedan 145 mm versus Coupe 157 mm.

Need the most torque. 3 generation 3.1 MT or 3.1 AT: 251 Nm, 140 hp, 3135 cm³, 6 V-shaped, fuel 95. That is 14 Nm above the Turbo 2.0 and 68 Nm above the 1 generation 2.5 MT.

Need the densest engine. 2 generation 1.8 MT 150 hp Turbo or 1.8 AT 150 hp: 83.5 hp/l, then the 165 hp 2.0 Turbo at 83.1 hp/l.

Need RWD. Only 1 generation. Among those six, 3.8 MT / 3.8 AT for 110 hp and 3800 cm³; 2.5 MT / 2.5 AT for 92 hp, 183 Nm, and Distributed injection (multi-point); 2.3 MT / 2.3 AT only if 78 hp is enough.

Need a naturally aspirated 3 generation 2.0. The 110 hp 2.0 MT / 2.0 AT over the 97 hp pair: +13 hp, +3 Nm, compression 9.2 vs 8.8, fuel 80 vs 92.

Need Automatic. Every generation offers Automatic 3. Manual counts differ: Manual 4 in 1 generation, Manual 5 in 2 generation and 3 generation. Automatic never gains extra ratios in this data.

Need FWD and a Coupe. 2 generation only. Inside it, skip the 2 hp gap between 88 hp 1.8 MT and 90 hp 2.0 MT unless displacement is the filter; the real 2 generation steps are 88 → 150 hp on the 1.8 and 90 → 165 hp on the 2.0.

Prices are not in the data, so “what the extra money buys” is read as what extra displacement and extra boost buy: 189 cm³ from 1.8 Turbo to 2.0 Turbo buys 15 hp; Turbo on the 3 generation 1985 cm³ 2.0 buys 68 hp over the 97 hp 1998 cm³ 2.0 and 55 hp over the 110 hp 2.0; 1137 cm³ from that 1998 cm³ 2.0 to the 3.1 buys 43 hp and 91 Nm over the 97 hp engine, or 30 hp and 88 Nm over the 110 hp engine, while giving up 25 hp to the Turbo 2.0.