The Honda Civic X Sedan Si 1.5T, produced for the 2017 and 2018 model years, represented a significant step forward for the Civic Si line. Positioned as the performance-oriented variant within the tenth-generation Civic sedan range, it aimed to deliver a more engaging driving experience than the standard Civic trims while remaining a practical daily driver. This model occupied a space between the more economical Civic LX and EX models and the more luxurious Touring trim, appealing to enthusiasts seeking a balance of performance and affordability. It was exclusively offered with a six-speed manual transmission, a hallmark of the Si tradition, and a turbocharged 1.5-liter inline-four engine.
Technical Specifications
| Brand | Honda |
| Model | Civic |
| Generation | Civic X Sedan |
| Type (Engine) | Si 1.5T (205 Hp) |
| Start of production | 2017 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – urban (EPA) | 8.4 l/100 km (28 US mpg, 33.6 UK mpg, 11.9 km/l) |
| Fuel consumption (economy) – extra urban (EPA) | 6.2 l/100 km (37.9 US mpg, 45.6 UK mpg, 16.1 km/l) |
| Fuel consumption (economy) – combined (EPA) | 7.4 l/100 km (31.8 US mpg, 38.2 UK mpg, 13.5 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Emission standard | LEV3-ULEV125 |
| Weight-to-power ratio | 6.4 kg/Hp, 155.5 Hp/tonne |
| Weight-to-torque ratio | 5.1 kg/Nm, 197.3 Nm/tonne |
| Power | 205 Hp @ 5700 rpm |
| Power per litre | 136.8 Hp/l |
| Torque | 260 Nm @ 2100-5000 rpm (191.77 lb.-ft. @ 2100-5000 rpm) |
| Maximum engine speed | 6500 rpm |
| Engine layout | Front, Transverse |
| Engine Model/Code | L15B7 |
| Engine displacement | 1498 cm3 (91.41 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 73 mm (2.87 in.) |
| Piston Stroke | 89.5 mm (3.52 in.) |
| Compression ratio | 10.3:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 3.5 l (3.7 US qt | 3.08 UK qt) |
| Kerb Weight | 1318 kg (2905.69 lbs.) |
| Trunk (boot) space – minimum | 416 l (14.69 cu. ft.) |
| Fuel tank capacity | 47 l (12.42 US gal | 10.34 UK gal) |
| Length | 4643 mm (182.8 in.) |
| Width | 1798 mm (70.79 in.) |
| Height | 1410 mm (55.51 in.) |
| Wheelbase | 2700 mm (106.3 in.) |
| Front track | 1537 mm (60.51 in.) |
| Rear (Back) track | 1554 mm (61.18 in.) |
| Minimum turning circle (turning diameter) | 11.5 m (37.73 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the front wheels of the vehicle. |
| Drive wheel | Front wheel drive |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Ventilated discs, 312 mm |
| Rear brakes | Disc, 282 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 235/40 R18 |
| Wheel rims size | 8J x 18 |
Introduction
The 2017-2018 Honda Civic X Sedan Si 1.5T marked a return to form for the Civic Si, blending turbocharged power with the engaging driving experience enthusiasts had come to expect. Built on the globally recognized Civic X platform (FC/FK), this variant aimed to bridge the gap between the standard Civic sedans and the more track-focused Civic Type R. The “Si” designation, historically signifying “Sport Injected,” continued to represent a performance upgrade over the base models, focusing on enhanced engine output, improved handling, and a more driver-centric interior.
Powertrain & Engine Architecture
At the heart of the Civic Si 1.5T lies the L15B7 engine, a 1.5-liter inline-four cylinder powerplant. This engine utilizes direct injection and a single-scroll turbocharger with an intercooler to produce 205 horsepower at 5700 rpm and 192 lb-ft of torque between 2100-5000 rpm. The engine features a dual-cam (DOHC) valvetrain and a compression ratio of 10.3:1. A key element of the Si’s performance is its exclusive six-speed manual transmission, featuring shorter gear ratios compared to the standard Civic. This transmission is paired with a single-mass flywheel, contributing to quicker engine response. The engine’s turbocharging system provides a broad torque curve, offering strong acceleration throughout the rev range.
Driving Characteristics
The Civic Si 1.5T delivers a noticeably more spirited driving experience than its non-Si counterparts. The shorter gearing of the manual transmission allows for quicker acceleration, while the turbocharger provides a surge of power in the mid-range. While not as brutally fast as the Civic Type R, the Si offers a more accessible and predictable power delivery, making it enjoyable for both daily commuting and spirited driving on winding roads. The steering is precise and well-weighted, providing good feedback to the driver. The suspension, tuned for performance, offers a firm but controlled ride, minimizing body roll during cornering. Compared to the standard Civic automatic, the Si’s manual transmission demands more driver involvement, but rewards with a more connected and engaging experience.
Equipment & Trim Levels
The Civic Si 1.5T came standard with a comprehensive list of features. Interior appointments included sport seats with enhanced bolstering, a leather-wrapped steering wheel, and aluminum sport pedals. Standard technology included a 7-inch touchscreen infotainment system with Apple CarPlay and Android Auto compatibility, as well as a multi-angle rearview camera. Optional extras were relatively limited, focusing primarily on accessories like all-season floor mats and a trunk spoiler. The interior trim was generally black with red accents, reinforcing the Si’s sporty character.
Chassis & Braking
The Civic Si 1.5T benefits from chassis enhancements designed to improve handling and stability. It features a unique suspension tuning with stiffer springs and dampers compared to the standard Civic. A rear stabilizer bar further reduces body roll. The braking system consists of ventilated front discs (312mm) and solid rear discs (282mm), providing adequate stopping power for the car’s performance capabilities. The standard inclusion of ABS (Anti-lock Braking System) enhances safety and control during emergency braking situations.
Market Reception & Comparison
The 2017-2018 Civic Si 1.5T was generally well-received by automotive critics. It was praised for its engaging driving dynamics, responsive engine, and well-equipped interior. Compared to the standard Civic trims, the Si offered a significant performance upgrade at a relatively affordable price point. While the Civic Type R offered even more extreme performance, the Si provided a more balanced and practical option for enthusiasts. Fuel economy was also a strong point, with the Si achieving respectable MPG figures for a performance-oriented vehicle. Some critics noted the engine’s turbo lag at lower RPMs, but overall, the Si was considered a compelling value in the compact performance segment.
Legacy
The L15B7 engine and the Civic Si 1.5T have proven to be relatively reliable in the used car market. The engine is known for its durability, and the manual transmission is generally robust. Regular maintenance, including oil changes and timely servicing of the turbocharger, is crucial for long-term reliability. Today, the Civic Si 1.5T remains a popular choice among enthusiasts seeking an affordable and engaging performance car. Its combination of practicality, fuel efficiency, and driving enjoyment has ensured its continued appeal in the used car market.
