Honda TSX 2004: Unveiling the Power and Precision of Acura's Sports Sedan

Honda TSX 2004 – Powertrain Excellence

The 2004 Honda TSX, marketed as the Acura TSX in North America, was conceived as a meticulously engineered sports sedan, harmonizing agile handling with spacious comfort for five occupants. This delicate equilibrium guided every facet of its creation, notably the selection of its powertrain. When deliberating on the ideal powertrain configuration for this novel machine, the optimal path soon became apparent. While a V-6 engine, akin to that in the 3.2 TL, could deliver substantial power, it would concurrently amplify the vehicle’s dimensions and mass, deviating from the TSX’s inherent sporting essence. Conversely, an in-line 4-cylinder engine, incorporating Acura’s cutting-edge technologies, promised a lighter, more balanced, and compact vehicle, underscoring overall sporting prowess and responsive handling.

Powering this latest Acura performance-luxury sedan, the Honda Tsx 2004, is an advanced 2.4-liter DOHC i-VTEC in-line 4-cylinder engine, an evolution of the technology found in the RSX Type-S sports coupe. Featuring an i-VTEC “intelligent” valve control system, which integrates Variable Valve Timing and Lift Electronic Control (VTEC) with Variable Timing Control (VTC), the TSX engine delivers impressive power, noteworthy fuel efficiency, and remarkably low exhaust emissions.

Feature	2004 Honda TSX (Acura TSX)
Engine Type	L-4 DOHC i-VTEC
Displacement	2354 cc (2.4-liter)
Compression Ratio	10.5:1
Recommended Fuel	Premium Unleaded, 91 Octane
Horsepower Output @ rpm	200 @ 6800
Torque Output @ rpm (lbs.-ft.)	166 @ 4500
Transmission Options	6 MT / 5 AT
EPA Estimated Mileage (City/Highway)	21/29 (MT) – 22/31 (AT)
Emissions Certification	EPA Tier 2-Bin 5, CARB LEV-2

This all-aluminum powerhouse of the Honda TSX 2004, boasting four valves per cylinder and optimized intake and exhaust systems, generates 200 horsepower at 6800 rpm. This figure surpasses its European competitors by up to 32 horsepower. Complementing this is a robust 166 pound-feet of torque at 4500 rpm and an EPA-estimated fuel economy of 21/29 mpg (City/Highway), a remarkable achievement considering the engine’s formidable horsepower.

| Engine Performance Comparison | |
|—|—|—|—|—|
| | 2004 Honda TSX (Acura TSX) | 2003 Audi A4 1.8 T | 2003 BMW 325i | 2003 Mercedes-Benz C240 |
| Engine | 2.4-liter DOHC i-VTEC I-4 | 1.8-liter DOHC I-4 turbo | 2.5-liter DOHC I-6 | 2.6-liter SOHC V-6 |
| Horsepower @ rpm | 200 @ 6800 | 170 @ 5900 | 184 @ 6000 | 168 @ 5500 |
| Torque @ rpm (lbs.-ft.) | 166 @ 4500 | 166 @ 1950 | 175 @ 3500 | 177 @ 4500 |
| Standard Transmission | 6 MT or 5AT | 5 MT | 5 MT | 6 MT |
| EPA Estimated Mileage (City/Highway) | 22/29* (MT) 23/32* (AT) | 22/31 | 20/29 | 18/27 |

Despite its potent output, the Honda TSX 2004 engine is also remarkably clean. With its rear-mounted exhaust layout, close-coupled catalyst, and advanced Programmed Fuel Injection (PGM-FI), it adheres to stringent Tier 2-Bin 5 and Low Emission Vehicle-2 (LEV-2) standards.

The Honda TSX 2004 offered transmission choices to suit different driving preferences: a 6-speed close-ratio manual transmission and a 5-speed SportShift automatic. The manual gearbox, featuring a lightweight magnesium alloy case and multi-cone synchronizers, provides light, quick action and short shift throws.

The 5-speed SportShift automatic transmission in the Honda TSX 2004 can operate as a conventional automatic or be manually shifted for a more engaging driving experience. Enhanced by a new-generation drive-by-wire throttle system, the SportShift transmission’s shift logic is refined, ensuring seamless gear transitions.

*Preliminary EPA mileage estimates determined by internal testing using EPA method.

Honda TSX 2004 Powertrain Highlights:

Engine:

2.4-liter, DOHC, i-VTEC 4-cylinder engine: 200 horsepower at 6800 rpm and 166 lbs.-ft. of torque at 4500 rpm.
i-VTEC “intelligent” valve-control system with VTC (Variable Timing Control).
Drive-by-wire throttle control system.
Computer-controlled Programmed Fuel Injection (PGM-FI).
Dual balance shafts for exceptional smoothness.
Direct ignition system.
Lightweight alloy pistons and high-strength connecting rods.
110,000-mile tune-up intervals.

Emissions/Fuel Economy:

Estimated mileage: 22/33 mpg (City/Highway, 5 AT) and 21/29 mpg (City/Highway, 6 MT) (EPA method based).
EPA Tier 2-Bin 5, CARB Low Emission Vehicle-2 (LEV 2-) compliant.
Rear-facing exhaust ports and under-floor converter for faster catalyst light-off.

6-Speed Manual Transmission:

Close-ratio 6-speed for improved performance and fuel efficiency.
Lightweight magnesium transmission case and bellhousing.
Multi-cone synchronization on all gears for light shifting.
Short 45 mm shift throws for a sporty feel.
Short clutch pedal stroke with light effort.
Compact clutch for quicker acceleration.
Advanced clutch torsion mechanism reduces gear noise.

5-Speed Sequential SportShift Automatic Transmission:

Quick-response 5-speed Sequential SportShift for semi-manual operation.
Drive-by-wire cooperative control for quicker shifts.
Ratios complement engine’s powerband for performance and efficiency.
Lockup torque converter for superior fuel economy.
Intuitive 5-position shift gate.
Advanced Grade Logic Control for reduced gear “hunting” on hills.
Linear solenoid direct-acting control for smoother and responsive shifts.

Noise, Vibration (NV) Reduction:

Chain-driven balance shafts mounted in the oil pan.
Maintenance-free silent-chain camshaft drive.
Aluminum block with cast-in iron cylinder liners for light weight and durability.
Aluminum block and one-piece aluminum crankshaft carrier for improved strength.
Maintenance-free serpentine accessory drive with auto-tensioner.

i-VTEC Valve-Control System: The Heart of Honda TSX 2004 Performance

The Honda TSX 2004 incorporates the latest iteration of the Variable Valve Timing and Lift Electronic Control (VTEC) system, initially featured in the Acura NSX supercar. By modulating valve lift based on critical engine parameters, VTEC empowers the engine to generate robust low-end torque and exceptional high rpm power. The TSX engine utilizes the “intelligent” i-VTEC system, first seen in the RSX Type-S sports coupe. This system augments VTEC with VTC (Variable Timing Control) to provide continuously variable camshaft timing. By dynamically adjusting valve lift and timing to suit the engine’s operational demands, i-VTEC delivers substantial enhancements in performance, efficiency, and emissions.

VTEC (Variable Timing and Lift Electronic Control)

VTEC is an innovative system that fine-tunes valve lift and opening duration to optimize engine performance across the rpm range. At lower rpm, VTEC adjusts valve timing and lift for optimal cylinder filling, creating a swirl effect for improved combustion. As rpm increases, VTEC transitions to a high-lift, long-duration cam profile, maximizing high-rpm output. The Honda TSX 2004 employs a VTEC variation similar to the NSX, utilizing three rockers per valve pair to vary valve lift and duration.

VTC (Variable Timing Control)

The i-VTEC system integrates VTC, continuously adjusting intake cam timing to match engine conditions. This precise control optimizes power, fuel economy, and emissions. The powertrain control unit monitors various parameters and commands the VTC actuator to adjust the intake cam, enhancing engine output and reducing emissions.

Drive-By-Wire Throttle Control System: Enhancing Driving Dynamics in the Honda TSX 2004

An electronic drive-by-wire system enhances the driving character of the Honda TSX 2004. By electronically linking the throttle pedal to the throttle butterfly, engine response is optimized for driving conditions and driver input. Eliminating the direct cable connection allows for continuous optimization of the pedal-to-throttle movement ratio, significantly improving drivability.

The system monitors pedal position, throttle position, vehicle speed, engine speed, road slope, corner radius, and engine vacuum to determine driving conditions. This data defines throttle control sensitivity, tailoring the Honda TSX 2004’s response to various driving scenarios. In stop-and-go traffic, response is smooth and progressive. In low- to medium-speed driving, gain increases for better acceleration. At high speeds, further gain ensures ample passing response. The system also adjusts for road slope and curves, maintaining control and responsiveness.

The throttle system collaborates with the SportShift 5-speed automatic transmission for faster and smoother shifts. By coordinating throttle opening with transmission functions, engine power is precisely managed during gear changes, minimizing shift shock and delay. The Honda TSX 2004 uses a DC motor for throttle butterfly control, upgraded for vibration resistance.

Alt Text: 2004 Honda TSX Engine showcasing the 2.4-liter i-VTEC inline-4, highlighting the engine’s compact and performance-oriented design.

Honda TSX 2004 – Body: Aerodynamic and Rigid Design

Introduction to the Honda TSX 2004 Body

The exterior styling of the Honda TSX 2004, marketed as the Acura TSX, established a design direction for future Acura sedans. While retaining familiar Acura styling cues, the TSX’s sheet metal embodied a more emotional and evocative approach, lending the vehicle an aggressive, sporty aesthetic. The distinct and clean body form of the Honda TSX 2004 also hinted at, and rightly so, a strong emphasis on aerodynamics.

Beneath its fresh exterior, the Honda TSX 2004 featured an exceptionally rigid unit body structure, forming the bedrock for the car’s spirited driving dynamics. The utilization of specialized high-strength materials and sophisticated computer modeling endowed the TSX driver with a performance experience that truly lived up to the car’s visual promise.

In essence, the Honda TSX 2004 epitomized stylish performance and meticulous craftsmanship, injecting substantial excitement into the Acura lineup.

Design Objectives of the Honda TSX 2004 Body

The Honda TSX 2004’s rigid and aerodynamic body was sculpted to accentuate performance. Its 105.1-inch wheelbase strategically positioned the wheels at the body’s corners, maximizing interior space, while the rounded cabin contributed to an aerodynamically efficient form. This design philosophy resulted in a European-inspired exterior appearance coupled with maximized interior volume.

The overall design language was characterized by crisp, taut lines, conveying a muscular tension that subtly promised performance. The front fascia featured Acura’s signature grille, style lines extending along the hood, and minimalist High-Intensity Discharge (HID) headlamps. Large air intakes beneath the front bumper directed airflow to the radiator. Combined with 17-inch wheels and tires that filled the wheel arches, the Honda TSX 2004 projected an aggressive and poised stance.

The body sides showcased a sharp style line originating from the front fender flare and gracefully ascending towards the rear. Substantial C-pillars enhanced structural strength and rollover protection while augmenting the car’s muscular presence. Chrome-plated door handles added a touch of luxury in both appearance and tactile feel. Exceptionally tight body gaps underscored precision engineering and meticulous attention to detail in the Honda TSX 2004.

At the rear, the rear window sloped gently to meet a short, high trunk lid. The trunk lid’s sharp termination facilitated clean air separation, minimizing turbulence and enhancing stability and fuel economy at higher speeds for the Honda TSX 2004. The all-glass windshield incorporated UV ray reflection to help maintain a cooler interior temperature.

Static and Dynamic Stiffness of the Honda TSX 2004 Body

Structural stiffness is paramount for any sports sedan. An immensely robust unit body is crucial for ensuring a quiet and rattle-free cabin, enabling precise suspension tuning for both road holding and ride comfort, and maximizing crash safety. The Honda TSX 2004 unit body was engineered and computer-modeled to embody these exact attributes.

From the outset, the stiffness targets for the Honda TSX 2004 were benchmarked against two of Europe’s most successful and respected four-door sedans: the Audi A4 and the BMW 3 Series. The Honda TSX 2004 surpassed both in bending and torsional rigidity.

Achieving superior rigidity and balanced front-to-rear stiffness necessitated meticulous attention to the front bulkhead, the area forward of the radiator, below the front fender edges, at the base of the B-pillars, and the region surrounding the C-pillars. This effort yielded maximum strength with minimal weight, a body structure highly resistant to squeaks and rattles, exceptionally sharp handling characteristics, and minimized levels of noise, vibration, and harshness (NVH) in the Honda TSX 2004.

Aerodynamic Performance and Noise Reduction in the Honda TSX 2004

Outstanding aerodynamic performance was a primary focus for Honda TSX 2004 designers. This emphasis on airflow management yielded benefits across various aspects, including reduced wind noise within the cabin, a low drag coefficient (Cd) for enhanced efficiency, and improved handling stability at high speeds. The Honda TSX 2004’s aerodynamic drag coefficient was among the top in its class, according to internal testing.

The tapered front end and rounded cabin of the Honda TSX 2004 were designed to facilitate smooth airflow around the front bumper and body sides. Engineers meticulously minimized the gap between each wheel arch and tire to reduce airflow disruption. To further control airflow around wheels and tires and minimize turbulence, the Honda TSX 2004 incorporated polypropylene inner fenders, engine undercover, mid-floor and rear floor covers, and air dams ahead of each wheel well.

Aerodynamic turbulence directly correlates to noise and drag. Consequently, the same strategies that enhanced aerodynamic performance also reduced wind noise within the Honda TSX 2004’s passenger cabin. A significant improvement stemmed from a redesigned shape for the A-pillars and side mirrors. The mirrors incorporated a subtle V-angle to manage airflow over and under the mirror, reducing turbulence and noise.

By analyzing airflow through the channel between the mirror and A-pillar, engineers discovered that the speed of airflow through this channel significantly affected cabin noise levels. Shaping this channel into an expanding V-shaped passage, along with carefully contouring the A-pillar and mirror housing, prevented air from “peeling” or tumbling across the glass. This eliminated vortex formation and substantially reduced mid- and high-frequency wind noises in the Honda TSX 2004, by as much as 1.4 dB at certain speeds.

The Honda TSX 2004 achieved remarkably low levels of mid- and high-frequency wind noise compared to competitors, enhancing occupant comfort, particularly at highway speeds or in crosswinds.

Wheels, Tires, and Lighting of the Honda TSX 2004

The Honda TSX 2004 featured generously sized P215/50R17 tires that filled the wheel arches, contributing to a distinguished and muscular appearance. Tight tolerances between tires and wheel arches further enhanced both aesthetics and aerodynamic performance.

The Honda TSX 2004 came standard with High-Intensity Discharge (HID) low beams and halogen high beams. HID headlights, with their wider beam pattern and extended range, significantly improved nighttime visibility. The light emitted by HID headlamps, while appearing slightly blue compared to conventional halogen lights, provided truer color rendition and superior clarity. HID lamps were also more energy-efficient and had a longer lifespan. Aerodynamic wrap-around lenses integrated the headlights seamlessly into the body.

At the rear, separate round brake and turn-signal lamps, tail lamps, and back-up lamps contributed to the Honda TSX 2004’s performance-oriented aesthetic.

Visibility, Moonroof, and Multiplexing in the Honda TSX 2004

Excellent outward visibility is crucial for both safety and driving enjoyment. The Honda TSX 2004 offered 284 degrees of outward visibility. Engineers prioritized expansive rear three-quarter visibility for enhanced safety in traffic and easier parking maneuvers.

The windshield, backlight, and side glass of the Honda TSX 2004 all incorporated UV-reducing properties, creating a more comfortable driving environment and protecting interior materials from sun damage.

The power glass moonroof of the Honda TSX 2004 was a notable feature. Its rigid roof structure provided a solid mounting for the glass panel and mechanism. The flush-fitting tinted glass panel and seal minimized wind noise. A specially designed linkage and motor ensured quiet operation. A pop-up air deflector further reduced wind noise. A sliding interior sunshade provided interior cooling and shade when needed.

To simplify wiring and enhance electrical system functionality, the Honda TSX 2004 employed multiplexed wiring. This system allowed a single wire to carry multiple command signals simultaneously, reducing wiring complexity, cost, and weight while improving reliability and durability.

Door Design and NVH Measures in the Honda TSX 2004

The sound of a car door closing can subtly convey luxury and quality. Honda TSX 2004 engineers meticulously refined the door sashes to minimize high-frequency resonance upon door closure. Door latches were engineered for secure closure with minimal effort and a refined sound. A special “bumping door seal” transmitted a low-frequency vibration to the door, creating a substantial closing sound that evoked an impression of solidity and quality in the Honda TSX 2004.

Even small details like the door checker mechanism contributed to perceived quality. The Honda TSX 2004 used a new type of checker for smoother door operation with distinct detents at partially open positions.

Paint Technology, Color Palette, and Anti-Corrosion Measures for the Honda TSX 2004

The Honda TSX 2004 was available in seven exterior colors, including Satin Silver Metallic, Premium White Pearl, and Nighthawk Black Pearl.

Engineers comprehensively addressed Noise, Vibration, and Harshness (NVH) in the Honda TSX 2004. The engine/suspension subframe utilized a vibration-canceling structure and rigid aluminum engine mounts. The rear suspension subframe featured stiff construction to minimize road shock and vibration transmission. Interior quietness was enhanced through sound-absorbing roof lining, urethane floor liner, and various insulators.

The Honda TSX 2004 employed a carefully engineered system of six engine mounts to balance NVH isolation with stable engine placement for handling precision. Electronically controlled hydraulic mounts adjusted stiffness based on driving conditions.

The Honda TSX 2004 was built with extensive anti-corrosion measures, including galvanized steel throughout the unit body, electroplating, seam sealants, and anti-chipping coatings. The body was backed by a 5-year/unlimited-mile limited warranty for outer body rust-through.

Alt Text: Side profile of a 2004 Honda TSX showcasing its sleek body lines, 17-inch wheels, and aerodynamic silhouette, emphasizing its sporty design.

Honda TSX 2004 – Chassis: Precision Handling and Ride Comfort

Introduction to the Honda TSX 2004 Chassis

The Honda TSX 2004, Acura’s entry-level sports sedan, was engineered to deliver responsive, balanced, and sharp handling, rivaling the best European competitors. This capability stemmed from its impressively stiff unit body, enabling precise tuning of the double-wishbone front and rear suspension systems for maximum responsiveness, flat cornering, and high-speed stability.

Goals and Benchmarks for the Honda TSX 2004 Chassis

The ride, handling, and stability targets for the Honda TSX 2004 were set to exceed those of the most respected compact sport sedans from Europe. Achieving this high performance level required an exceptionally stiff unit body structure to enhance handling precision and crash safety. This robust structure allowed the suspension to be tuned for a responsive sport driving experience, rather than compensating for body flex.

Balancing sports-car-like handling with high-speed stability and passenger comfort was a key challenge. Honda chose independent double-wishbone front and rear suspension for the TSX 2004, utilizing steel and aluminum components and specific geometry to control lift, dive, and body roll. This resulted in exceptional dynamic performance, stability, comfortable ride, and enhanced driver confidence. The Honda TSX 2004 responded accurately to steering and throttle inputs even at its cornering limits.

Front and Rear Suspension of the Honda TSX 2004

The Honda TSX 2004 front suspension was a double-wishbone system with sport-tuned shock absorbers, stabilizer bar, and shock-tower bar. This setup provided quick response and precise suspension geometry control throughout its travel range, ensuring balanced and composed handling even on uneven surfaces.

Computer-developed front suspension geometry incorporated subtle handling enhancements. The Honda TSX 2004 featured pronounced steering self-centering for improved high-speed stability and lane control. Anti-dive geometry minimized forward pitching during hard braking, while anti-lift geometry reduced front-end lift during acceleration. Toe control adjustments during cornering and braking further enhanced stability. A special compliance bushing in the front subframe allowed controlled fore-aft movement for superior ride quality.

Both front and rear suspension systems in the Honda TSX 2004 used coil-over shock absorbers with high rebound damping rates and relatively firm springs, balancing sporting performance and ride comfort through extensive testing.

The Honda TSX 2004 rear suspension employed a 5-link design with an aluminum knuckle and double tubular wishbones. The lightweight aluminum knuckle reduced unsprung weight by 13.2 lbs and increased rigidity by 50% over iron, improving ride quality and suspension responsiveness.

Like the front suspension, the rear system used anti-dive geometry for braking stability and passenger comfort. Toe control geometry optimized stability during cornering, while a stabilizer bar minimized body roll during hard cornering. The rear suspension roll center was positioned close to the vehicle’s center of gravity to enhance responsiveness and minimize body lean in sharp maneuvers in the Honda TSX 2004.

Power Steering, Tires, and Braking of the Honda TSX 2004

The Honda TSX 2004 featured a quick-ratio power rack-and-pinion steering system designed for reduced resistance, improved linearity, and minimized steering-wheel kickback. Tighter tolerances, a variable-damping steering damper, stiffer mounting bushings, and a variable hydraulic valve in the steering gearbox valve housing contributed to these improvements, providing a lighter feel, more linear response, and reduced kickback from road imperfections.

Standard P215/50R17 93V Michelin MXM4 all-season high-performance tires, jointly developed by Acura and Michelin, offered an excellent balance of ride and handling while promoting fuel efficiency. These tires were mounted on 17×7-inch aluminum wheels.

The Honda TSX 2004 braking system comprised 4-wheel disc brakes with large 11.8-inch ventilated front rotors and 10.2-inch solid rear rotors, providing exceptional braking feel. A 4-channel anti-lock braking system (ABS) was standard.

To achieve a solid brake pedal feel, engineers used a low 2.6:1 pedal ratio, a small 20.6 mm master cylinder piston, a lighter and more powerful single master power vacuum unit, and ultra-stiff front brake calipers, resulting in a firm, confidence-inspiring pedal feel and excellent braking performance.

Vehicle Stability Assist (VSA) in the Honda TSX 2004

Vehicle Stability Assist (VSA) was standard on every Honda TSX 2004. It used ABS technology, lateral acceleration sensors, wheel-speed sensors, steering position sensors, and a dedicated microprocessor to detect and mitigate wheel slip (understeer or oversteer). VSA helped maintain vehicle control by reducing engine output (via drive-by-wire throttle) or applying brakes to individual wheels as needed.

VSA activated automatically and alerted the driver via an instrument panel warning lamp when operating. It could be switched off via a dashboard switch. The VSA system also handled traction control, utilizing ABS to sense wheel spin and applying brakes and throttle control to restore traction on slippery surfaces, enhancing safety and control in winter driving or on low-friction surfaces in the Honda TSX 2004.

Alt Text: Front suspension detail of the 2004 Honda TSX, showcasing the double-wishbone design, sport-tuned shock absorbers, and robust construction contributing to its agile handling.

Honda TSX 2004 – Interior: Driver-Focused Comfort and Luxury

Introduction to the Honda TSX 2004 Interior

Stepping into the Honda TSX 2004 driver’s seat immediately reveals a purposeful cockpit designed for driving enthusiasts. Benchmarked against leading sports sedans, the TSX interior prioritized driving efficiency. Instruments were modern and concise, and controls offered a satisfying tactile feel, creating a sense of immediate familiarity and control.

Beyond its sporty focus, the Honda TSX 2004 interior transcended its class in fit and finish. From perforated leather seating to dual automatic climate control and a 360-watt Acura premium sound system, the cabin exuded a tangible sense of quality.

Honda TSX 2004 Interior At-A-Glance:

Cockpit designed for performance driving.
Large, easy-to-read LED backlit analog instruments.
Small-diameter, leather-wrapped 3-spoke steering wheel with tilt and telescope.
Leather-trimmed seats.
Supportive, performance-oriented front bucket seats.
8-way power driver’s seat with adjustable lumbar support.
Automatic dual-zone climate control, power windows, power mirrors, keyless entry.
8-speaker, 360-watt Acura Premium Sound System with 6-disc in-dash CD changer.
Side curtain airbags and comprehensive safety features.
Roomy interior with seating for five.
Blue LED ambient lighting.
60/40 locking split-folding rear seatback.
Homelink® remote control system.
Keyless entry with window controls and panic button.
Seamless passenger airbag cover.
Available Acura Navigation System with Voice Recognition.

Styling and Driver-Oriented Cockpit of the Honda TSX 2004

The Honda TSX 2004 interior layout emphasized a sporting focus, featuring large analog instruments, a thick-rimmed, small-diameter steering wheel with integrated controls, and standard perforated leather upholstery. Metallic-look accents on the steering wheel complemented a sweeping accent band across the instrument panel. Parchment leather interiors featured a warm wood pattern accent band, while Ebony and Quartz interiors had a satin alloy finish.

The driver-oriented cockpit prioritized functional and natural control placement. Supportive sport seats, an 8-way power driver’s seat, and a tilt/telescoping steering wheel accommodated diverse body types. Large format instrumentation, audio, and climate controls kept the focus on driving. Controls, especially the 6-speed manual shifter, provided positive tactile feedback in the Honda TSX 2004.

Steering Wheel, Seating, and Instrumentation in the Honda TSX 2004

The Honda TSX 2004 steering wheel featured a thick leather-wrapped rim, a clean 3-spoke design, and integrated controls for audio and cruise control. Navigation-equipped models added voice control switches.

Performance-engineered front bucket seats provided excellent support and driver connection. The 8-way power driver’s seat, benchmarked against European seats, offered superior lateral support and stable pelvic support. Adjustable lumbar support ensured proper comfort for various body types. The front passenger seat was a 4-way manual bucket seat with fixed lumbar support.

Large analog LED backlit instruments provided clear driver information. Progressive illumination created a welcoming feel. A bottom-hinged accelerator pedal offered a linear feel and finer control in conjunction with the drive-by-wire throttle in the Honda TSX 2004.

Interior Room and Cargo Versatility of the Honda TSX 2004

The Honda TSX 2004, classified as a compact car, offered generous interior space, particularly in foot room and headroom.

The 13.0 cubic foot trunk (12.8 cubic feet with navigation) was accommodating and versatile, accessible via keyless remote or electric switch. Widely spaced hinges and a flat load floor enhanced usability. A lockable 60/40 split-folding rear seatback further expanded cargo capacity. A valet key provided ignition operation but restricted access to the glove box, trunk, and rear seatback.

2004 Honda TSX (Acura TSX) Interior Dimensions Comparison
	2004 Acura TSX	Lexus IS 300	2003 Audi A4 1.8 T	2003 BMW 325i	2003 Mercedes-Benz C240
Headroom (in., front/rear)	37.8/37.3	39.1/37.7	38.4/37.2	38.4/37.5	38.9/37.6
Legroom (in., front/rear)	42.4/34.2	42.7/30.2	41.3/34.3	41.4/34.4	41.7/33.0
Shoulder Room (in., front/rear)	55.4/53.5	52.6/53/5	55.1/53.4	54.4/54.2	53.1/54.3
Hip room (in., front/rear)	54.4/54.4	52.8/53.9	NA	NA	52.0/54.4
Interior volume, EPA (cu. ft.)	104	99.3	103	102	101
Passenger volume, EPA (cu. ft.)	91	89.2	90	91	89
Trunk volume, EPA (cu. ft.)	13.0	10.1	13.0	11.0	12.0

Comfort, Convenience, and Interior Finish of the Honda TSX 2004

The Honda TSX 2004 interior included numerous comfort and convenience features, such as front and rear cup holders, storage bins, seatback map pockets, in-door storage, overhead sunglasses storage, and a padded, adjustable center armrest with a 12-volt outlet. Heated front seats, ambient blue lighting, illuminated window switches, twin 12-volt power outlets, and a HomeLink® remote system further enhanced convenience.

The interior combined sporty functionality with upscale appointments. Soft-touch materials were used throughout, including padded leather armrests and soft-touch door grab handles. A new spray-formed urethane instrument panel skin eliminated PVC, and a laser-cut tear-line concealed the passenger-side airbag.

Dual-zone automatic climate control ensured personalized comfort, with voice control available on navigation-equipped models of the Honda TSX 2004. An injection-molded urethane floor liner reduced noise and provided a more luxurious feel.

Interior Color Combinations, Keyless Entry, and Premium Sound System of the Honda TSX 2004

The Honda TSX 2004 offered perforated leather seating in three color combinations, each with a black upper instrument panel and center console. Accent band trim varied with upholstery color.

An enhanced keyless entry system offered remote window operation and a panic button. The premium sound system featured a 6-disc CD changer, AM/FM tuner, 360-watt amplifier, and eight speakers, delivering exceptional audio quality tailored to the TSX cabin acoustics. Steering wheel audio controls and voice control (navigation models) added convenience.

Acura Navigation System with Voice Recognition in the Honda TSX 2004

The Honda TSX 2004 offered an optional Acura Navigation System with Voice Recognition, featuring an 8-inch display, over seven million points of interest, and expanded voice capabilities. The system provided fast route calculation, 3-D graphics, split-screen mode, voice control of audio and climate systems, day/night modes, and turn-by-turn voice guidance.

The navigation system tracked vehicle position via GPS, gyroscope, and speed sensor. Voice recognition, developed by IBM and Honda R&D, understood approximately 150 commands and various English accents. The system could also be controlled via touch screen or joystick. A single DVD contained map data for the entire United States, with updateable DVDs available for purchase.

Alt Text: Interior view of the 2004 Honda TSX, highlighting the driver-focused cockpit, leather seats, ergonomic controls, and the optional Acura Navigation System screen.

Honda TSX 2004 – Safety: Comprehensive Active and Passive Protection

Introduction to Honda TSX 2004 Safety Features

The Honda TSX 2004 prioritized safety through advanced technologies, encompassing both accident avoidance and occupant protection. Active safety features, crucial for preventing accidents, included standard Vehicle Stability Assist (VSA), Traction Control System (TCS), and anti-lock braking system (ABS). Passive safety measures, designed to protect occupants in a collision, ranged from structural rigidity and crumple zones to advanced airbags and seatbelt systems.

Active Safety Features of the Honda TSX 2004

The Honda TSX 2004’s active safety suite comprised:

Rigid platform for precise suspension tuning and road-holding.
Sport-tuned double-wishbone suspension for sure-footed handling.
P215/50R17 Michelin MXM4 all-season tires for excellent grip.
4-wheel disc brakes with 4-channel ABS for strong braking.
Vehicle Stability Assist (VSA) for enhanced driver control.
Traction Control System (TCS) for improved traction on slippery surfaces.
Power rack and pinion steering for precise response and road feel.

Crash Safety Objectives and Side Impact Rating of the Honda TSX 2004

Honda aimed for top safety ratings for the TSX 2004:

Front NCAP (35 mph): 5 Star (projected).
Offset IIHS (40 mph): Good.
Side impact (38.5 mph SINCAP): 4 Star (projected).

The Honda TSX 2004 excelled in side-impact testing, achieving a projected 4-Star rating. High-tensile steel around the passenger compartment and reinforced joints contributed to energy absorption and distribution in side impacts and other collisions. Strong cross-member stiffeners further enhanced side-impact resistance.

Reactive Safety Features of the Honda TSX 2004

The Honda TSX 2004’s reactive safety features included:

Dual-stage, dual-threshold front airbags.
Driver and front passenger’s side airbags.
Position-sensing front passenger side airbag.
Side curtain airbags for all outboard seating positions.
Front seat-belt pretensioners with load-limiters.
Side-impact door beams.
Front and rear crumple zones.
Sliding front subframe.
Lower Anchors and Tethers for Children (LATCH) system.
Theft-deterrent system.
Engine immobilizer system.

Airbag System and Seat Belts of the Honda TSX 2004

The Honda TSX 2004 featured dual-stage, dual-threshold front airbags that deployed at different rates depending on crash severity. Side airbags in the front seats included a passenger position sensing system to prevent deployment if a child or small adult was in the deployment path. Side curtain airbags protected front and rear outboard passengers in side impacts, with rapid deployment.

Front seat belts incorporated pretensioners and load-limiters. Pretensioners tightened belts in the initial milliseconds of a collision, while load-limiters allowed belts to stretch to mitigate deceleration forces. The Honda TSX 2004 also included the LATCH system for child safety seats.

Crumple Zones, Subframe, and Anti-Theft Features of the Honda TSX 2004

Front and rear crumple zones in the Honda TSX 2004 were computer-modeled for progressive impact resistance, dispersing collision forces. A sliding front subframe moved rearward in severe frontal collisions to further absorb crash energy.

Anti-theft features included an electronic engine immobilizer, reinforced door lock cylinders, and hood and trunk lock protectors, enhancing vehicle security for the Honda TSX 2004 owners.

Alt Text: IIHS Side Impact Rating for the 2004 Honda TSX (Acura TSX), illustrating the vehicle’s structural integrity and safety performance in side collision scenarios.

Honda TSX 2004 – Environmental Sensitivity: Eco-Conscious Engineering

Environmental Sensitivity in the Design of the Honda TSX 2004

Environmental responsibility was a key engineering goal for the Honda TSX 2004 program. Engineers implemented various strategies to enhance vehicle efficiency, reduce emissions, and improve recyclability.

Key Environmental Achievements of the Honda TSX 2004:

Weight Reduction: Lightweight components like a magnesium manual transmission case, aluminum rear suspension knuckle, aluminum wheels, and a lightweight melt-sheet insulator reduced overall vehicle weight, minimizing energy consumption.
Lead Elimination: Efforts to eliminate lead resulted in significantly reduced lead content compared to industry averages.
PVC Elimination: PVC was eliminated from the urethane instrument panel, weather stripping, door moldings, and shift knob, reducing harmful materials in manufacturing and disposal.
Recycled Materials: The Honda TSX 2004 utilized a higher percentage of recycled materials, including recycled bumpers used for under panels and bumper spacers, promoting sustainability.

The Honda TSX 2004 demonstrated Acura’s commitment to both performance and environmental consciousness, offering a sports sedan that was not only exhilarating to drive but also designed with environmental sensitivity in mind.

Alt Text: CARB LEV-II Emission Standards graphic relevant to the 2004 Honda TSX, indicating its compliance with California Air Resources Board Low Emission Vehicle standards.