The NASCAR Helmet to IMSA Adapter (SKU: SCC-NHEL2I) is a specialized communication interface cable designed to bridge the gap between two distinct motorsports wiring standards. This adapter enables drivers with NASCAR-style helmet wiring to seamlessly connect to IMSA car harness systems, providing critical communication capability across different racing disciplines. At $55.00, this adapter represents an essential piece of equipment for multi-series racers and teams operating in various motorsports environments.
 
Technical Specifications
Electrical Characteristics
Input Configuration: 3-conductor NASCAR standard wiring
Output Configuration: 4-conductor IMSA standard wiring
Operating Voltage: 12V DC nominal
Current Rating: Up to 3.0A continuous
Cable Length: 6 inches (152mm)
Connector Type: Molded automotive-grade connectors
Operating Temperature Range: -40°C to +85°C
Wire Gauge: 22 AWG stranded copper conductors
 
Physical Specifications
Overall Length: 6 inches (152mm)
Weight: 0.1 pounds (45g)
Connector Housing: High-impact thermoplastic
Cable Jacket: Polyurethane (PUR) - abrasion and chemical resistant
Bend Radius: 25mm minimum
 
NASCAR vs IMSA Wiring Standards
NASCAR 3-Conductor Standard
NASCAR helmet systems utilize a 3-conductor configuration where the microphone and speaker grounds are tied together. This simplified wiring scheme provides reliable communication for stock car racing environments where full-duplex communication is not typically required. The 3-conductor system includes:
Microphone positive (+)
Speaker positive (+)
Common ground (shared mic/speaker)
 
IMSA 4-Conductor Standard
IMSA systems employ a 4-conductor configuration that separates the microphone and speaker grounds, enabling advanced communication features including full-duplex intercom capability between driver and co-driver. The 4-conductor system includes:
Microphone positive (+)
Microphone ground (-)
Speaker positive (+)
Speaker ground (-)
 
This separation allows for superior noise isolation and enables compatibility with advanced radio systems from manufacturers like Motorola, Vertex Digital, Kenwood, and Baofeng that require the IMSA standard.
 
Primary Helmet Partnership - Roux Helmets
Speedcom maintains an exclusive partnership with Roux Helmets, offering factory-integrated communication systems. Available Roux models include:
Roux GT Carbon Kevlar Helmet ($1,575.00 regular, $1,417.50 sale price)
ROUX R-1F Fiberglass ($669.00)
Complete accessory packages and gear bags
 
These helmets feature factory-integrated communications with Speedcom's patented noise-cancelling RTM microphone and Harris Radio plugs, specifically engineered for closed-cockpit GT racing applications.
 
Professional Installation Services
While Speedcom specializes in Roux helmets, they provide professional installation services for major racing helmet brands including Bell, Stilo, Arai, Simpson, HJC, Pyrotect, and Zamp. The NASCAR to IMSA adapter is universally compatible with any helmet equipped with proper NASCAR-style 3-conductor wiring configuration.
 
Technical Compatibility Notes
Bell Helmets: Speedcom offers specific installation tutorials and services for Bell racing helmet communication systems
Universal Compatibility: The adapter functions with any helmet having appropriate NASCAR wiring, regardless of manufacturer
Custom Applications: Technical support available for unique helmet configurations and racing requirements
 
Applications and Use Cases
Multi-Series Racing
This adapter is essential for drivers competing in multiple racing series with different communication standards. Teams operating in both NASCAR and IMSA environments can utilize existing helmet investments across platforms while maintaining optimal communication performance.
 
Equipment Standardization
Racing teams can standardize on IMSA car harnesses while accommodating drivers with NASCAR helmet systems, reducing inventory complexity and training requirements across different racing disciplines.
 
Professional Racing Series
Compatible with official communication systems used in Creventic 24H Series, Pirelli World Challenge, FARA, Trans Am, HSR, U.S. F-4 Championship, GT Open, GT Spain, and Supercar Challenge, reflecting Speedcom's position as the official communications equipment supplier to these premier racing organizations.
 
Technical Support and Services
For installation assistance, compatibility questions, or professional installation services, contact Speedcom Communications technical support at 386-760-7110. Speedcom's experienced technicians provide comprehensive support for both Roux helmet integration and aftermarket installations on other major helmet brands. Professional installation services are available through authorized dealers and racing equipment specialists nationwide, ensuring optimal performance and safety compliance across all racing applications.