The Toyota iQ is a unique city car produced by Toyota from 2008 to 2012. While not officially sold in the United States, the iQ gained recognition for its exceptionally small footprint and innovative interior packaging. Designed primarily for the European and Japanese markets, it aimed to provide a practical and efficient vehicle for urban environments. The iQ distinguished itself with a 3+1 seating configuration, offering full seating for three adults and a limited space for a fourth occasional passenger. This article details the technical specifications and characteristics of the Toyota iQ 1.4 D-4D variant, a diesel-powered version of the model.
Toyota iQ 1.4 D-4D: An Overview
The 1.4 D-4D model represents a fuel-efficient option within the iQ lineup, utilizing a small-displacement diesel engine to maximize economy. It was targeted towards drivers prioritizing low running costs and environmental considerations. The iQ’s design philosophy centered around minimizing exterior dimensions while maximizing interior space, a challenge Toyota addressed through a clever engineering approach. The car’s short length and tight turning radius made it particularly well-suited for navigating congested city streets. The iQ was a statement in minimalist mobility, and while production was relatively short-lived, it left a mark as a uniquely packaged vehicle.
Engine & Performance
The Toyota iQ 1.4 D-4D is powered by the 1ND-TV, a 1.4-liter inline-four cylinder diesel engine. This engine produces 90 horsepower at 3800 rpm and 190 Nm (140.14 lb.-ft.) of torque between 1800 and 3000 rpm. The engine features a turbocharger with an intercooler, enhancing power output and efficiency. The diesel commonrail fuel injection system contributes to refined combustion and reduced emissions. With a compression ratio of 17.9:1, the engine is optimized for fuel economy. The power-to-weight ratio is 10.5 kg/Hp, and the torque-to-weight ratio is 5 kg/Nm. The engine’s output allows for a maximum speed of 170 km/h (105.63 mph). The iQ 1.4 D-4D achieves impressive fuel economy figures: 4.8 l/100 km (49 US mpg, 58.9 UK mpg) in urban driving, 3.5 l/100 km (67.2 US mpg, 80.7 UK mpg) on the extra-urban cycle, and a combined consumption of 4.0 l/100 km (58.8 US mpg, 70.6 UK mpg). It meets Euro 4 emission standards.
Design & Features
The Toyota iQ is a three-door hatchback with seating for four, though the rear seats are best suited for occasional use. Its defining characteristic is its compact size, measuring just 2985 mm (117.52 in) in length, 1680 mm (66.14 in) in width, and 1500 mm (59.06 in) in height. The wheelbase is 2000 mm (78.74 in). The iQ’s design prioritized interior space efficiency. The dashboard is positioned relatively far forward, maximizing cabin room. Safety features included ABS (Anti-lock Braking System) as standard. The car’s interior, while minimalist, was designed with a focus on functionality and ease of use. Trunk space is limited, ranging from a minimum of 32 liters (1.13 cu. ft.) to a maximum of 238 liters (8.4 cu. ft.) with the rear seats folded down. The iQ’s styling was modern for its time, with a distinctive front fascia and a sloping roofline. The car’s turning circle is a tight 7.8 m (25.59 ft), further enhancing its maneuverability in urban settings.
Technical Specifications
| Brand | Toyota |
| Model | iQ |
| Generation | iQ |
| Type (Engine) | 1.4 D-4D (90 Hp) |
| Start of production | November, 2008 |
| End of production | April, 2012 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Hatchback |
| Seats | 4 |
| Doors | 3 |
| Fuel consumption (urban) | 4.8 l/100 km (49 US mpg, 58.9 UK mpg) |
| Fuel consumption (extra urban) | 3.5 l/100 km (67.2 US mpg, 80.7 UK mpg) |
| Fuel consumption (combined) | 4 l/100 km (58.8 US mpg, 70.6 UK mpg) |
| Fuel Type | Diesel |
| Maximum speed | 170 km/h (105.63 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 10.5 kg/Hp |
| Weight-to-torque ratio | 5 kg/Nm |
| Power | 90 Hp @ 3800 rpm |
| Torque | 190 Nm @ 1800-3000 rpm (140.14 lb.-ft. @ 1800-3000 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | 1ND-TV |
| Engine displacement | 1364 cm3 (83.24 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 73 mm (2.87 in.) |
| Piston Stroke | 81.5 mm (3.21 in.) |
| Compression ratio | 17.9:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | OHC |
| Engine oil capacity | 4 l (4.23 US qt | 3.52 UK qt) |
| Coolant | 4.5 l (4.76 US qt | 3.96 UK qt) |
| Kerb Weight | 945 kg (2083.37 lbs.) |
| Max. weight | 1285 kg (2832.94 lbs.) |
| Max load | 340 kg (749.57 lbs.) |
| Trunk (boot) space – minimum | 32 l (1.13 cu. ft.) |
| Trunk (boot) space – maximum | 238 l (8.4 cu. ft.) |
| Fuel tank capacity | 32 l (8.45 US gal | 7.04 UK gal) |
| Length | 2985 mm (117.52 in.) |
| Width | 1680 mm (66.14 in.) |
| Height | 1500 mm (59.06 in.) |
| Wheelbase | 2000 mm (78.74 in.) |
| Minimum turning circle | 7.8 m (25.59 ft.) |
| Drivetrain Architecture | Front wheel drive |
| Number of gears | 5 |
| Gearbox type | Manual transmission |
| Front suspension | Independent type McPherson |
| Rear suspension | Torsion |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 175/65R15 |
In conclusion, the Toyota iQ 1.4 D-4D was a uniquely positioned vehicle, offering a blend of fuel efficiency, compact dimensions, and innovative packaging. While its production run was limited, it remains a notable example of Toyota’s engineering creativity and its commitment to addressing the challenges of urban mobility.
