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Fiat X1/9 Technical Specs (1500 Series)
Engine and Performance
- 1.5L SOHC Inline-4: A 1,498cc engine featuring an aluminum cylinder head and a single overhead camshaft driven by a toothed belt.
- Output: Produces 85 hp (European) or 75 hp (US-spec with Bosch fuel injection) and 87 lb-ft of torque.
- Fuel Delivery: Later US models (1980+) utilized Bosch L-Jetronic electronic fuel injection, a significant technical leap over the earlier Weber 34 DAT carburetors.
- Cooling System: Features a front-mounted radiator with long coolant pipes running through the center chassis tunnel, requiring a specific bleeding procedure to prevent air pockets.
Drivetrain and Transmission
- Mid-Engine Layout: The engine and transaxle are mounted transversely behind the cockpit, utilizing a "power pack" design originally derived from the front-wheel-drive Fiat 128.
- Transmission: Upgraded to a 5-speed manual transaxle in 1978, featuring a magnesium alloy casing to reduce unsprung weight at the rear.
- Differential: Open differential integrated into the transaxle; the car’s low polar moment of inertia allows for extremely rapid rotation during cornering.
Chassis and Design
- Safety Cell: Designed to meet rigorous US crash standards of the 1970s, the chassis is exceptionally rigid, featuring front and rear "crumple zones" and a reinforced roll-bar integrated into the B-pillar.
- Suspension: Independent MacPherson struts at all four corners, a rare and sophisticated setup for a small displacement sports car of that period.
- Braking: Four-wheel hydraulic disc brakes (227 mm) with a dual-circuit master cylinder, providing balanced stopping power without the need for a vacuum booster in early models.
Dimensions
- Wheelbase: 86.7 inches (2,202 mm).
- Length: 156.3 inches (3,970 mm).
- Curb Weight: Approximately 2,028 lbs (920 kg).
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