The 2016 Civic Si marked a significant turning point in the model’s history, introducing a groundbreaking turbocharged engine for the first time. This bold move redefined the Civic Si, enhancing its performance capabilities while also boosting fuel efficiency. This article delves into the specifics of this exciting evolution, exploring how the 2016 Civic Si delivered a thrilling driving experience with its innovative powertrain.
A New Era of Power: The Turbocharged 1.5-Liter Engine
Departing from its naturally aspirated predecessors, the 2016 Civic Si embraced a potent 1.5-liter, 16-valve DOHC direct-injected turbocharged engine. This enhanced version of the powerplant found in other Civic models like the EX-T, EX-L, and Touring trims, was specifically tuned to amplify the Si’s sporty character. The result was an impressive output of 205 horsepower at 5700 rpm and a robust 192 lb-ft of torque, available across a wide band from 2100 to 5000 rpm. This represented a substantial leap of 31 horsepower and 25 lb-ft of torque compared to other 1.5-liter turbocharged Civic variants, signaling the Si’s elevated performance intentions.
The compact and powerful 1.5-liter turbocharged engine of the 2016 Civic Si, highlighting its direct injection and turbocharging systems.
This strategic shift to a smaller displacement, turbocharged engine was a departure from the previous generation 2015 Civic Si, which relied on a larger 2.4-liter naturally aspirated engine. The 36-percent reduction in displacement brought about significant advantages. The new 1.5-liter engine was lighter and more compact, contributing to improved vehicle dynamics and agility. Moreover, the sophisticated electronically controlled, intercooled turbocharging system ensured that the 2016 Si matched the peak horsepower of its predecessor (205 hp) but achieved it at a significantly lower and more accessible rpm. Crucially, the turbocharged engine delivered a superior torque output across a much broader rpm range, translating to enhanced responsiveness and a more engaging driving experience, perfectly aligning with the Si’s fun-to-drive ethos.
Preserving the Pure Driving Experience: 6-Speed Manual Transmission and Limited-Slip Differential
While the engine technology underwent a revolution, the 2016 Civic Si remained true to its core driving spirit. It continued to be offered exclusively with a 6-speed manual transmission, catering to enthusiasts who crave maximum driver control and a tactile connection with the vehicle. This all-new gearbox, however, was refined with a slicker shift action and revised ratios meticulously tailored to complement the power delivery characteristics of the new turbocharged engine.
To effectively harness the increased power and ensure optimal traction, the 2016 Civic Si retained the helical limited-slip front differential as standard equipment. This crucial feature, carried over from previous generations, played a vital role in putting power down to the ground efficiently, especially during spirited driving and cornering.
Efficiency Meets Performance: Fuel Economy and Emissions
The 2016 Civic Si engine was engineered to meet stringent emissions standards, complying with EPA Tier3/Bin125 and CARB LEV 3/ULEV125 regulations. Beyond environmental considerations, the new powertrain, coupled with aerodynamic improvements and reduced running resistance, resulted in substantial gains in both performance and fuel efficiency compared to the 2015 Civic Si with its 2.4-liter engine. EPA fuel economy ratings showcased impressive improvements across the board:
- City: +6 mpg (+27%)
- Highway: +7 mpg (+23%)
- Combined: +7 mpg (+28%)
These figures underscored the success of the turbocharged approach, delivering enhanced performance without sacrificing fuel economy.
Detailed Powertrain Specifications and Features
The 2016 Civic Si’s powertrain was packed with advanced technologies and features designed to optimize performance, efficiency, and reliability.
Turbocharged 1.5-liter, DOHC Direct-Injected Inline-4 Engine Key Highlights:
- Dual Variable Timing Control (VTC): Enhances engine responsiveness and efficiency across the rev range.
- Low Inertia Mono Scroll Turbo with Electronic Waste Gate: Provides rapid boost response and precise control over boost pressure.
- Computer-Controlled Direct Injection (DI) with Multi-Hole Fuel Injectors: Optimizes fuel atomization for efficient combustion and reduced emissions.
- 10.3:1 Compression Ratio: Specifically tuned for turbocharging and performance.
- Lightweight, High Rigidity Steel Crankshaft: Contributes to engine durability and reduced vibration.
- Drive-by-Wire Throttle System: Offers precise throttle control and enhanced driving dynamics.
- Maintenance Minder™ System: Optimizes service intervals, reducing unnecessary maintenance.
- 100,000 +/- Miles Tune-up Interval: Long-lasting components minimize maintenance needs.
- 205 Horsepower at 5700 rpm (SAE net): Peak power output for exhilarating performance.
- 192 lb-ft Torque at 2100-5000 rpm (SAE net): Broad torque band for responsive acceleration.
- Premium Unleaded Recommended Fuel: Optimized for premium fuel to unlock maximum performance.
Emissions and Fuel Economy Ratings:
- EPA Tier3/Bin125 and CARB LEV 3/ULEV125 Emissions Compliant: Meets strict emissions standards.
- U.S. EPA Fuel-Economy Ratings (city/highway/combined): 28/38/32 mpg – Excellent balance of performance and efficiency.
Transmission and Drivetrain:
- 6-speed Manual Transmission: Provides engaging driver control.
- Helical Limited-Slip Differential: Maximizes traction and handling.
A detailed view of the 2016 Civic Si’s turbocharger system, illustrating the hot and cold airflow paths for efficient performance.
Engine Architecture and Advanced Features in Detail
The 2016 Civic Si’s 1.5-liter engine was a marvel of engineering, packed with sophisticated features to deliver its impressive performance.
Cylinder Block and Crankshaft: Constructed from lightweight die-cast aluminum with reinforced main bearing caps, the engine block prioritized weight reduction. Cast-in iron cylinder liners ensured durability, while the micropolished forged-steel crankshaft minimized internal friction.
Pistons and Connecting Rods: The pistons featured cavity-shaped crowns for stable combustion and optimized skirts to reduce reciprocating weight. Twin oil jets and cooling galleries enhanced heat resistance. Ion-plated piston rings and heat-forged, crack-separated steel connecting rods further minimized friction and weight.
Cylinder Head and Valvetrain: The lightweight DOHC cylinder head was made from pressure-cast aluminum alloy and integrated the exhaust port directly into the head. A low-friction silent-chain drove the dual overhead cams and four valves per cylinder. Sodium-filled exhaust valves, smaller M12 sparkplugs, and direct-injection multi-hole fuel injectors were employed for enhanced efficiency and performance.
Direct Injection System: The direct-injection system optimized fuel delivery for increased torque and fuel efficiency. A high-pressure pump and multi-hole injectors enabled precise fuel atomization directly into each cylinder.
Low Inertia Mono Scroll High-Flow Turbo System with Electronic Wastegate: The turbocharger was designed for maximum responsiveness, building boost quickly even at low rpm. The electrically actuated wastegate allowed for precise boost pressure control, reaching a maximum of 20.3 psi in the Si. A large, low-restriction intercooler further enhanced performance by cooling the intake air.
Friction Reducing Technology: Numerous friction-reducing technologies were incorporated, including low-friction coating on piston skirts, plateau honing of cylinder bores, low viscosity 0W-20 oil, a two-stage oil pump relief valve, low-friction oil seals, low-drag piston ring design, low-friction cam chain, and a lightweight crankshaft.
Drive-by-Wire Throttle System: This system replaced the traditional throttle cable with electronic control, resulting in reduced weight, quicker throttle actuation, and optimized engine response. SPORT mode further enhanced throttle response for performance driving.
Emissions Control and Maintenance: The engine met stringent emissions standards and featured long-lasting components, with 100,000+/- mile tune-up intervals and a Maintenance Minder™ system to optimize service schedules.
6-Speed Manual Transmission: The exclusive 6-speed manual transmission was refined for smoother shifts and enhanced durability, featuring more rigid mounts, a refined shift linkage, and improved synchronizers. Revised gear ratios were specifically matched to the turbocharged engine’s power delivery.
Manual Transmission Gear Ratio Comparison:
| Gear Ratio (X:1) | 2015 Civic Si 2.4L | 2017 Civic EX-T 1.5L Turbo | 2017 Civic Si 1.5L Turbo |
|---|---|---|---|
| 1st | 3.267 | 3.643 | 3.643 |
| 2nd | 2.040 | 2.080 | 2.080 |
| 3rd | 1.429 | 1.361 | 1.361 |
| 4th | 1.073 | 1.024 | 1.024 |
| 5th | 0.830 | 0.830 | 0.830 |
| 6th | 0.647 | 0.686 | 0.686 |
| Reverse | 3.583 | 3.673 | 3.673 |
| Final Reduction Ratio | 4.760 | 4.105 | 4.105 |
Powertrain Feature Comparison:
| Feature | 2015 Civic Si 2.4L | 2017 Civic EX-T 1.5L Turbo | 2017 Civic Si 1.5L Turbo |
|---|---|---|---|
| Engine Type | L-4 | L-4 Turbocharged | L-4 Turbocharged |
| Displacement (cc) | 2354 | 1498 | 1498 |
| Horsepower @ rpm (SAE net) | 205 @ 7000 | 174 @ 5500 | 205 @ 5700 |
| Torque (lb-ft @ rpm SAE net) | 174 @ 4400 | 167 @ 1800-5500 | 192 @ 2100-5000 |
| Bore and Stroke (mm) | 87.0 x 99.0 | 73 x 89.5 | 73 x 89.5 |
| Compression Ratio | 11.0:1 | 10.6:1 | 10.3:1 |
| Maximum Boost Pressure (psi) | – | 16.5 | 20.3 |
| Fuel Injection | Port | Direct | Direct |
| Programmed Fuel Injection (PGM-FI) | • | – | – |
| Valvetrain | 16-Valve DOHC i-VTEC® | 16-Valve DOHC w/ VTC | 16-Valve DOHC w/ VTC |
| Drive-by-Wire Throttle System | • | • | • |
| Low-Inertia MONO Turbocharger | • | • | |
| Variable Intake Valve Lift | • | – | – |
| Intake/Exhaust Variable Cam Timing | • | • | • |
| Transmission | 6MT | CVT/6MT | 6MT |
| Helical Limited-Slip Differential | • | – | • |
| Front Wheel Drive | • | • | • |
| 100K +/- Miles No Scheduled Tune-Ups | • | • | • |
Fuel Economy and Emissions Ratings Comparison:
| Ratings | 2015 Civic Si 2.4L | 2017 Civic EX-T 1.5L Turbo | 2017 Civic Si 1.5L Turbo |
|---|---|---|---|
| EPA Fuel Economy Ratings1 (city/hwy/combined) | 22/31/25 (6MT) | 31/42/35 (6MT) | 28/38/32 (6MT) |
| Recommended fuel | Premium Unleaded | Regular Unleaded | Premium Unleaded |
| CARB emissions rating | ULEV-2 | LEV3-ULEV125/ LEV3-SULEV30 | LEV3-ULEV125 |
(Data source: 2017 EPA fuel-economy ratings and Honda official specifications.)
The 2016 Civic Si, though marketed as a 2017 model year vehicle, represented a transformative leap for the iconic performance trim. The introduction of the 1.5-liter turbocharged engine not only maintained the Si’s celebrated horsepower figures but significantly enhanced torque delivery and fuel efficiency, creating a more well-rounded and exhilarating driving experience for enthusiasts.
