Boost Leash systems offer precise boost control for turbocharged vehicles, enhancing performance and providing customizable settings for various driving scenarios.
Forum discussions highlight installations on Mustangs and Camaros, showcasing the system’s adaptability and integration with existing turbo kits and braking systems.
What is a Boost Leash?
Boost Leash, manufactured by On3 Performance, is a sophisticated electronic boost controller designed for turbocharged engines. It’s a five-stage, time-based system, coupled with a dedicated launch stage, offering both Race and Street modes for versatile control.
The system utilizes a simple three-wire hookup – 12V power, ground, and a launch input – simplifying installation. It allows users to precisely manage boost levels, enhancing performance and tailoring the driving experience to specific needs, as demonstrated in installation guides and forum discussions.
Benefits of Using a Boost Leash
Boost Leash provides significantly improved boost control accuracy compared to manual methods, leading to optimized engine performance and reliability. Users benefit from customizable boost stages, enabling tailored setups for different driving conditions – street cruising or aggressive racing.
Integration with systems like trans brakes, as discussed on LS1TECH, streamlines operation. The system’s timer-based control and launch features enhance responsiveness and consistency, maximizing power delivery and overall driving enjoyment.

Components of a Boost Leash System
A Boost Leash system includes a controller, CO2 bottle with regulator, solenoid valves, and a wiring harness for seamless integration and precise boost management.
Boost Leash Controller
The Boost Leash controller is the central hub, offering five time-based boost stages plus a dedicated launch stage for optimal performance. It features a simple three-wire hookup – 12V power, ground, and a launch input – simplifying installation.
Users can activate different boost groups instantaneously or on a timer using the green and orange wires, allowing for customized control. The controller remains powered on with the ignition, providing constant readiness.
CO2 Bottle and Regulator
The CO2 bottle provides the necessary pressure for the Boost Leash system to function, regulated to deliver precise boost control. Mounting typically occurs in the trunk, requiring secure techniques to prevent movement during operation.
Pairing the bottle with a regulator ensures consistent pressure delivery to the solenoid valves. Careful consideration of trunk space and accessibility is crucial during installation for easy refills and maintenance.
Solenoid Valves
Solenoid valves are critical components, precisely controlling the flow of boost based on signals from the Boost Leash controller. These valves rapidly open and close, enabling quick boost adjustments for different driving modes or stages.
Motion Raceworks kits often include twin wastegate CO2 setups, enhancing control. Proper plumbing and secure connections are essential to prevent leaks and ensure optimal system performance and responsiveness;
Wiring Harness and Connectors
The Boost Leash utilizes a straightforward wiring scheme: 12V power, ground, and a launch input. The controller’s green and orange wires facilitate switch logic, activating boost groups instantaneously or on a timer.
Secure, quality connectors are vital for reliable operation. Careful routing prevents damage, and proper insulation safeguards against shorts. Integrating with a trans brake is possible using the same activation button.
Installation Preparation
Boost Leash installation requires specific tools and a vehicle compatibility check. Prioritize safety by disconnecting the battery and reviewing all instructions carefully before starting;
Tools Required for Installation
Essential tools for a successful Boost Leash installation include a standard wrench set, screwdrivers (Phillips and flathead), wire strippers, and a crimping tool for secure electrical connections.
A multimeter is crucial for verifying power and ground, while Teflon tape ensures leak-proof plumbing connections. Additionally, a drill with appropriate bits may be needed for mounting the controller and CO2 bottle securely. Don’t forget safety glasses and gloves!
Safety Precautions
Prioritize safety during Boost Leash installation! Always disconnect the vehicle’s battery before commencing any electrical work to prevent shorts.
Handle the CO2 bottle with care, ensuring it’s securely mounted to avoid movement during operation. Wear safety glasses when working with plumbing and wiring. Be mindful of hot exhaust components and avoid flammable materials near the installation area. Proper ventilation is also recommended.
Vehicle Compatibility Check
Confirm compatibility before installing the Boost Leash. The system is widely used on Mustangs (S550, GT, EcoBoost) and Camaros, often paired with turbo kits like Hellion’s.
Ensure sufficient space for controller mounting (Fat House Fab bracket is popular) and CO2 bottle placement in the trunk. Verify the vehicle’s electrical system supports the 12V power requirement for the controller’s operation.
Wiring the Boost Leash Controller
Wiring involves a simple three-wire hookup: 12V power, ground, and a launch input. Utilize the green and orange wires for switch logic and boost group activation.
Power Connection (12V)
Establishing a reliable 12V power source is crucial for the Boost Leash controller’s operation. Connect the designated power wire to a switched 12V source within the vehicle’s electrical system, ensuring it activates only with the ignition.
Avoid direct connection to the battery for safety and to prevent potential draw when the vehicle is off. A fused connection is highly recommended to protect the controller and wiring from electrical faults or overloads, safeguarding the entire system.
Ground Connection
A solid ground connection is paramount for the Boost Leash controller’s stable performance and accurate readings. Connect the controller’s ground wire to a clean, unpainted metal surface on the vehicle’s chassis, ensuring minimal resistance.
This direct connection minimizes electrical interference and ensures reliable signal transmission. Secure the connection with a suitable grounding lug and bolt, verifying a firm and corrosion-free contact for optimal system functionality and long-term dependability.
Launch Input Wiring
The Boost Leash utilizes a simple three-wire hookup for launch control integration: 12V power, ground, and the launch input. Connect the launch input wire to a switched 12V source activated during launch, such as a trans brake switch or a momentary activation button.
This triggers the pre-set launch boost stage, delivering maximum power off the line. Proper wiring ensures seamless integration and responsive boost delivery during critical acceleration phases.
Switch Logic Wiring (Green and Orange Wires)

The green and orange wires enable activation of different boost groups, either instantaneously or on a timer, when the controller is in switch logic mode. These wires require connection to switched 12V sources controlled by separate switches.
Combining a trans brake and Boost Leash on a single button is feasible, offering convenient control. Careful planning of switch activation sequences is crucial for optimal performance.

Plumbing the Boost Leash System
Proper routing of boost lines and secure connections to the boost source and wastegate are essential for optimal system function and reliable boost control.
Connecting to the Boost Source
Establishing a connection to a reliable boost source is paramount for accurate control. Typically, this involves tapping into the charge piping post-intercooler, ensuring a consistent pressure reading. Utilize appropriate fittings and high-quality boost line tubing to prevent leaks.
Carefully consider the location to minimize pressure drop and ensure responsiveness. Securely tighten all connections, and double-check for any potential air leaks before proceeding with the installation. A solid connection guarantees precise boost management.
Routing Boost Lines
Proper boost line routing is crucial for optimal performance and to avoid interference. Keep lines away from exhaust components and moving parts to prevent melting or damage. Secure the lines with clamps at regular intervals, ensuring they don’t kink or rub.
Maintain a clean and organized layout for easy troubleshooting and future maintenance. Utilize appropriate line lengths to avoid strain on fittings and ensure smooth operation of the boost control system.
Wastegate Connection
Connect the Boost Leash solenoid valves directly to the wastegate(s) using high-quality boost line. Motion Raceworks kits simplify this process for twin wastegate setups. Ensure airtight seals at all connections to prevent boost leaks and maintain precise control.
Proper wastegate connection is vital for accurate boost regulation. Verify the lines are routed to the correct ports on the wastegate for intended operation;
Controller Mounting and Placement
Mount the Boost Leash controller using a Fat House Fab bracket, ideally below the radio for easy visibility and access during operation and adjustments.
Fat House Fab Bracket Installation
Utilizing the Fat House Fab bracket simplifies controller mounting, providing a secure and accessible location within the driver’s reach. Installation typically involves bolting the bracket to a suitable surface, often below the radio as suggested in forum posts.
Ensure the bracket is firmly attached to prevent vibrations and maintain controller stability. Proper placement is crucial for quick adjustments during track events or street driving, maximizing the benefits of the Boost Leash system.
Controller Visibility and Accessibility
Optimal controller placement prioritizes clear visibility and effortless access for real-time adjustments. Mounting below the radio, as many users recommend, keeps the controller within easy reach without obstructing essential driving functions.
Ensure the display is unobstructed and well-lit for quick boost stage verification. Accessibility is paramount, allowing drivers to switch between settings swiftly during launches or mid-run, enhancing overall control and performance.

CO2 Bottle Mounting
Secure CO2 bottle mounting within the trunk is crucial, utilizing robust techniques to prevent movement during acceleration and maintain system integrity.
Trunk Mounting Considerations
When mounting the CO2 bottle in the trunk, prioritize a location that minimizes potential impact during aggressive driving or unexpected stops. Ensure ample clearance around the bottle for safe handling and to prevent damage to the tank or vehicle body.
Proper ventilation is also important, although CO2 is not flammable, preventing buildup is a good practice. Secure the bottle firmly using straps or a custom bracket, preventing any shifting or rolling. Consider accessibility for easy refilling or replacement of the CO2 cartridge.
Secure Mounting Techniques
To securely mount the CO2 bottle, utilize robust straps or a fabricated bracket designed to withstand significant G-forces; Avoid relying solely on friction or loosely fitted restraints. Regularly inspect the mounting hardware for any signs of wear, loosening, or damage.
Employ padding between the bottle and mounting surface to minimize vibration and potential impacts. Ensure the mounting location doesn’t interfere with trunk access or other vehicle functions, prioritizing safety and functionality.

Boost Leash Configuration
The Boost Leash allows setting five boost stages, including a timer-based system and instantaneous groups, activated via switch logic or launch input.
Setting Boost Stages
The Boost Leash controller enables precise configuration of up to five distinct boost stages, catering to diverse performance needs. Users can tailor each stage to specific driving conditions, from relaxed street cruising to aggressive track performance.
These stages are programmable, allowing adjustments to boost levels for optimal engine safety and power delivery. Careful calibration is crucial, ensuring each stage functions as intended and avoids exceeding safe boost limits.
Timer-Based Boost Control
Boost Leash’s timer-based control allows for staged boost increases over a set duration, ideal for building power progressively during launches or acceleration. This feature prevents immediate shock to the drivetrain, enhancing component longevity.
Users define the timing for each boost stage transition, creating a customized power curve. This method provides a controlled and predictable boost delivery, maximizing traction and minimizing wheelspin, ultimately improving performance consistency.
Instantaneous Boost Groups
Boost Leash enables instantaneous switching between pre-set boost groups using the green and orange wires, offering on-the-fly power adjustments. This is particularly useful when paired with a trans brake, allowing for immediate high-boost launches.
These groups provide quick access to different power levels without relying on timers, catering to varied track conditions or driver preferences. Seamless transitions ensure responsive power delivery for optimal performance and control.
Testing and Calibration
Initial system checks and boost level verification are crucial after installation. Fine-tuning settings ensures accurate boost control and optimal performance for your specific setup.
Initial System Check
Before hitting the road, a thorough system check is paramount. Confirm the controller powers on with the ignition, verifying the 12V and ground connections are secure. Cycle through each boost stage to ensure the solenoid valves are responding correctly.
Visually inspect all boost lines for leaks, and double-check the CO2 bottle regulator is functioning as expected. A preliminary log, even a basic one, can reveal any immediate anomalies needing attention before calibration begins.
Boost Level Verification
After the initial system check, verify boost levels with a reliable boost gauge during controlled pulls. Start with the lowest boost setting and incrementally increase, carefully monitoring for accuracy. Compare the displayed boost to the configured stage within the controller.
Data logging is crucial here; record boost pressure alongside other vital engine parameters. Discrepancies indicate potential issues with solenoid operation, boost line leaks, or controller calibration needing immediate attention.
Fine-Tuning Boost Settings
Once boost levels are verified, fine-tune settings for optimal performance and safety. Adjust timer durations for staged boosts, ensuring smooth transitions between pressure levels. Experiment with instantaneous boost groups activated via switch logic, tailoring response to specific needs.
Small adjustments are key; monitor data logs closely after each change. Prioritize engine health and avoid exceeding safe boost limits for your components. Consistent testing yields the best results.

Integrating with Other Systems
Boost Leash seamlessly integrates with trans brakes and twin-turbo setups, offering synchronized activation and expanded control options for enhanced track performance;
Trans Brake Integration
Integrating a Boost Leash with a trans brake allows for simultaneous activation, launching with pre-staged boost for dramatically improved reaction times. Users report successfully connecting both systems to a single button, simplifying operation at the track. This setup ensures optimal power delivery immediately upon release, maximizing acceleration potential. The controller’s switch logic wiring, specifically the green and orange wires, facilitates this integration, enabling customized boost profiles triggered alongside the trans brake.
Twin Turbo Applications
The Boost Leash excels in twin turbo setups, offering independent control over boost levels for each turbocharger, or a unified boost strategy. Installations on vehicles like the Hellion twin 6466 Mustang demonstrate its compatibility with complex turbo configurations. Utilizing a Motion Raceworks CO2 kit alongside the Boost Leash ensures precise wastegate control, crucial for balancing boost across both turbos and maximizing overall power output.
Troubleshooting Common Issues
Controller power failures, solenoid valve malfunctions, and inconsistent boost levels are typical issues; verify wiring, connections, and CO2 supply for resolution.
Controller Not Powering On
If the Boost Leash controller fails to power on, begin by meticulously checking the 12V power connection and ensuring it’s securely fastened and receiving adequate voltage. Subsequently, verify the ground connection is solid and free from corrosion, as a poor ground can prevent operation.
Inspect the wiring harness for any damage or loose connections. Confirm the fuse, if present, hasn’t blown. A multimeter can pinpoint voltage drops or breaks in the circuit, aiding in diagnosis.
Solenoid Valve Malfunctions
When encountering solenoid valve issues, first confirm proper wiring to the controller, checking for loose connections or damaged wires. Verify the CO2 bottle has sufficient pressure and the regulator is functioning correctly, delivering consistent flow.
Inspect the valves themselves for physical damage or obstructions. A multimeter can test solenoid coil resistance; an open circuit indicates a failed valve. Ensure correct plumbing connections, avoiding kinks or leaks in the boost lines.
Inconsistent Boost Levels
If boost levels fluctuate, begin by re-verifying all boost line connections, ensuring they are airtight and free from leaks. Double-check the CO2 bottle pressure and regulator setting for stable output. Examine wastegate operation; a sticking or malfunctioning wastegate impacts boost control.
Review controller settings, confirming accurate stage configurations and timer values. Consider environmental factors, as temperature can influence boost performance. Data logging can pinpoint inconsistencies.

Resources and Support
On3 Performance provides direct support, while Mustang6G and LS1TECH forums offer valuable community insights and installation experiences from fellow enthusiasts.
On3 Performance Support
On3 Performance is the primary source for direct assistance with the Boost Leash system. Their team can address specific questions regarding installation, configuration, and troubleshooting.

They offer detailed product information and guidance, ensuring customers have the resources needed for a successful setup. Check their official website for contact details, including phone numbers and email addresses, to connect with their support staff.
Furthermore, On3 Performance provides video demonstrations, like the one available at https://youtu.be/yEXmNoDtSGg, illustrating the simple three-wire hookup process.
Mustang6G Forum Discussions
The Mustang6G forum is a valuable resource for Boost Leash users, particularly those with S550 Mustangs. Numerous threads detail installation experiences, offering photos and advice from fellow enthusiasts.
Users share insights on mounting the controller (often using a Fat House Fab bracket below the radio) and the CO2 bottle in the trunk.
These discussions provide practical tips and solutions for common challenges encountered during the installation process, aiding in a smoother setup.
LS1TECH Forum Discussions
LS1TECH provides a dedicated space for discussions surrounding the Boost Leash, especially within the Camaro and Firebird communities. Users explore integrating the system with a trans brake using a single button activation.
The controller’s always-on functionality with ignition is a key topic, alongside utilizing the green and orange wires for timed or instantaneous boost group activation.
These forums offer valuable insights into wiring configurations and operational nuances for optimal performance.
Advanced Features and Customization
Boost Leash allows for tailored wiring setups and data logging capabilities, offering enthusiasts deeper control and analysis of boost performance parameters.
Custom Wiring Configurations
Boost Leash’s flexibility extends to wiring; beyond the standard 12V, ground, and launch input, users can modify configurations for unique setups. The green and orange wires facilitate switch logic, enabling activation of different boost groups instantaneously or via timers.
Integrating with a trans brake on a single button is a common customization, streamlining operation. Advanced users can explore custom wiring to interface with other vehicle systems, maximizing control and personalization.

Data Logging Capabilities
While not explicitly detailed in the provided snippets, the potential for data logging exists within advanced Boost Leash configurations. Monitoring boost levels, timer durations, and switch activation events allows for precise tuning and performance analysis.
Users can leverage this data to optimize boost stages for specific track conditions or driving styles, ensuring consistent and reliable performance. Further investigation into On3 Performance resources may reveal specific logging features.
