Honda Civic Track Build: Adding AC & Electric Power Steering

Transforming Our $500 Track Civic: Comfort Meets Performance

After investing $45,000 in brakes, suspension, wheels, and a new engine, our track-focused Honda Civic remained brutally uncomfortable and trailed the Civic Type R by 5 seconds. We faced a critical dilemma: preserve raw speed or add creature comforts. This build diary reveals how we installed air conditioning, an ultra-lightweight lithium battery, and electric power steering—without compromising performance. Post-modification dyno results and real-world testing prove it’s possible to have both comfort and speed.

Why These Upgrades Matter for Track/Street Hybrids

Most stripped-down track cars sacrifice essentials like AC and assisted steering. But when blistering lap times come with unbearable cabin heat and arm fatigue, drivers lose consistency. Our solution:

• Electric power steering (EPS) from a Volvo/Porsche Cup car eliminates parasitic loss from mechanical pumps
• Full AC system with custom condenser routing fights heat soak during extended sessions
• Optima Lithium battery saves 18 lbs while powering new electrical demands

These aren’t luxury additions—they’re performance multipliers for endurance events and street-to-track transitions.

Chapter 1: Electric Power Steering Conversion

The ITB Compromise and EPS Solution

Individual throttle bodies (ITBs) created clearance issues with the factory hydraulic steering pump. Our fix: a Volvo-sourced electric power steering pump requiring 75-85 amps. Key considerations:

Safety First: Circuit Breakers Are Non-Negotiable

"Never skip the circuit breaker. Without it, amperage spikes can ignite wiring. We mounted a 100-amp breaker directly beside the pump."

The installation process involved:

1. Removing the hydraulic pump and serpentine belt
2. Installing a K-Tuned idler pulley kit to maintain belt tension
3. Fabricating brackets for the EPS unit near the crash bar
4. Routing high-gauge wiring (4 AWG) with fuse protection

Real-World Performance Gains

Post-installation testing revealed immediate benefits:

• Steering effort reduced by 60% at low speeds
• No parasitic drain on the engine (verified via dyno)
• Adjustable assist via voltage regulators (future upgrade)

Pro Tip: Porsche Cup cars use similar EPS systems for reliability during 24-hour races—validate your donor parts against racing applications.

Chapter 2: Air Conditioning Installation Challenges

AC Physics Simplified

Refrigerant’s state change between liquid and gas enables cooling:

1. Compressor pressurizes refrigerant (heating it)
2. Condenser dissipates heat (like a radiator)
3. Expansion valve triggers cooling via pressure drop
4. Evaporator transfers cold air to the cabin

Fitment Nightmares and Fixes

Damaged core support from previous jacking mishaps complicated condenser mounting. Our approach:

1. Straightening Core Supports: Used hydraulic rams to align crumpled sections
2. Custom Bracketry: Fabricated angled mounts to clear the intercooler
3. Fender Removal: Required for AC line routing between engine bay and evaporator

Critical Insight: "Factory service manuals underestimate real-world fitment issues. Budget 3x more time for custom fabrication."

The Filter vs. Hood Clearance Battle

Our ITBs forced the air filter into conflict with the hood. Despite attempts to modify the filter neck, clearance remained insufficient. Solution:

• Hood vent cutouts above the filter area
• Water-resistant sock cover for rainy conditions

"Coastal and desert driving demands filtration. Sacrificing protection for clearance risks engine longevity."

Chapter 3: Lithium Battery and Electrical Upgrades

Why Optima Lithium?

At 4.4 lbs versus 22 lbs for lead-acid, this battery offered:

• 75% weight reduction
• Faster cranking voltage
• Compact size enabling relocation

Terminal Adaptation:
Standard ring terminals don’t fit lithium posts. We:

1. Cut off old terminals
2. Crimped on M6 eyelet connectors
3. Used thread-locker on posts

Electrical System Load Testing

With AC (30A) and EPS (85A) drawing significant current, we:

• Upgraded alternator to 140A
• Installed a secondary bus bar
• Validated voltage drop at peak load (<0.5V)

Dyno Tuning Revelation:
Initial cranking issues traced to voltage sag. Solution:

• Pre-prime fuel system before ignition
• Use thicker ground cables

Final Results: Dyno Numbers and Driving Impressions

Performance Metrics

Component	Before	After
Wheel Horsepower	28 whp	230 whp
Weight	2,600 lbs	2,480 lbs
Track Gap vs Type R	+5 seconds	-0.8 sec

The Verdict

Post-modification testing confirmed:

• AC dropped cabin temps by 22°F within 5 minutes
• EPS made low-speed maneuvers effortless
• Lithium battery maintained 13.2V during simultaneous AC/EPS load

"This isn’t a compromised track car—it’s a faster one. Comfort additions reduced driver fatigue, enabling consistent lap times."

Toolbox: Essential Components and Resources

Immediate Action Checklist

1. Size circuit breakers 20% above peak amperage
2. Pressure-test AC lines before charging refrigerant
3. Mock up condenser placement before bumper installation

Recommended Gear

• K-Tuned Pulley Kits: Precision-machined for Honda K-series engines
• Optima Lithium Batteries: 2,500+ CCA in ultra-compact form
• Vintage Air Condensers: Slim profiles for tight engine bays

Why We Recommend: These brands survived 200+ track miles in our Civic with zero failures.

Conclusion: The Comfort-Speed Paradox Solved

Adding air conditioning and power steering to our track Civic didn’t just improve livability—it shaved seconds off lap times by reducing driver exhaustion. The 230 whp at 2,480 lbs proves lightweight components and electrical efficiency can coexist.

"What’s your biggest hurdle in balancing comfort and performance? Share your build challenges below—we’ll troubleshoot solutions together."

Final Thought: This project demonstrates that "race car" and "daily driver" aren’t mutually exclusive. With smart packaging and modern components, you can defy the trade-off.