title：How Honda Builds the NSX Supercar: Step-by-Step Factory Process

content: The Curiosity Behind Supercar Building

Ever wondered what makes a supercar different from a mass-produced sedan? When the video creators visited Honda’s Ohio factory to drive the NSX across Route 66, they got an inside look at the precision and care that goes into building this hybrid supercar. This article breaks down that process—from chassis welding to final quality checks—so you can understand exactly how Honda crafts each NSX.

The Honda Performance Manufacturing Center: A Factory Apart

Honda’s Marysville, Ohio, campus has two factories. One churns out 800 Accords daily, but just a short drive away is the Honda Performance Manufacturing Center (HPMC). Built exclusively for the NSX, this factory produces only 8-10 cars per day with a team of 100 staff. Unlike the mass-production plant, HPMC’s open layout lets visitors see every build stage—no hidden walls, no secret processes.

Chassis Construction: Precision to the Micron

The NSX’s chassis is a mix of aluminum space frame and monocoque. Pressed aluminum panels are welded on-site using robotic booths with 12 different jigs. Honda claims the chassis is welded to 0.1mm accuracy, meaning no post-weld machining is needed (unlike some other supercars). To verify, a coordinate measuring machine (CMM) checks 2700 data points across 500 locations—tolerances as tight as 50 microns (about the width of a human hair).

Steel A-pillars are bolted (not welded) to the aluminum frame to avoid corrosion (aluminum and steel react badly). This choice prioritizes frontal visibility—aluminum would take more space—even though it adds complexity. Carbon fiber roof and floor panels are attached later, after corrosion treatment.

Corrosion Treatment & Paint: Industrial Rigor Meets Art

Completed chassis go through six treatment tanks—cleaning and coating to prevent rust. Most liquid is recycled, making the process eco-friendly. Then, the chassis is baked to cure the coating.

Paint is a mix of robot and hand work. The body gets 11 coats (around 4 gallons) applied by robots for a flawless finish. Hand painting is reserved for parts like the front grille—black plastic that’s repainted to prevent fading.

Engine & Assembly: Handcrafted Hybrid Power

The NSX’s 3.5L twin-turbo V6 hybrid engine is built by hand in another U.S. plant. Each engine undergoes a 45-minute test and break-in before reaching HPMC. Installing the engine is a manual process—only one robot is used (for sealant). With just 3-4mm of clearance on either side, it takes over an hour to fit the engine into the chassis.

Every bolt is hand-threaded first to avoid cross-threading (aluminum is soft). Torque-controlled wrenches connected to computers ensure each nut is tightened to the exact setting—data logged for future reference.

Quality Control: No Stone Left Unturned

Honda holds 12 patents for the NSX build process, 6 of which are in quality control. Checks include:

Wheel alignment: Using a rigid test chassis to calibrate the machine, ensuring accuracy.
Corner weighting: Balancing the car to ensure optimal performance.
Dyno testing: Four runs to check power delivery, speed accuracy, brake pressure, and parking brake strength.
Bounce test: To catch any rattles or loose parts.
Paint inspection: In a bright, shiny room to spot scratches.
Water leak test: A spray booth to ensure no leaks.

Toolbox & Action Guide

For car enthusiasts wanting to dive deeper:

Checklist for Supercar Build Quality: Look for tight panel gaps, consistent paint finish, and documented torque settings (if possible).
Resource Recommendations:
- Honda Heritage Center: Visit to see NSX history and build process artifacts.
- NSX Factory Documentary: Honda’s official video gives a closer look at HPMC.
- Car and Driver’s NSX Review: For performance insights beyond the build process.

Conclusion

Building the NSX is a balance of robotic precision and human craft. From 0.1mm welding accuracy to hand-installed engines, every step is designed to deliver a supercar that’s both powerful and reliable.

What part of the NSX build process surprises you most? Is it the tight tolerances or the mix of automation and manual work? Share your thoughts in the comments!