For Chevy Camaro SS owners looking to shave tenths off their quarter-mile times, a launch control system is one of the most effective upgrades you can make. The Holley Two-Step Launch Control System offers a proven, reliable way to manage engine RPM during the launch, helping you put power to the ground without excessive wheel spin or bogging. While some aftermarket systems can cost well over a thousand dollars, the Holley Two-Step can be installed on a Camaro SS for under $500—if you do the work yourself. This detailed guide breaks down exactly what you need, what it costs, and how to install it step-by-step.

Understanding the Holley Two-Step Launch Control System

The Holley Two-Step system is essentially a programmable RPM limiter that operates in two stages. The first stage is typically activated when the clutch is depressed (or when the transbrake is engaged in an automatic) and limits engine RPM to a preset value—say 3,000–4,000 RPM. The second stage is your normal rev limiter, set much higher around 6,500–7,000 RPM for the Camaro SS's LS or LT engine. When you launch, the system smoothly transitions from the lower RPM limit to the higher limit, allowing you to build boost (if turbocharged) or simply hold the engine at the ideal RPM for your tires and track conditions.

This precision prevents two common issues: bogging (too low an RPM) and excessive wheel spin (too high an RPM). By controlling the launch, the system helps you achieve consistent, repeatable runs that translate into lower ETs. For a Camaro SS—whether it's a fifth-generation (2010–2015) with an LS3 or a sixth-generation (2016–2024) with an LT1—the Holley Two-Step is a popular choice because it integrates with the existing ignition system and is relatively straightforward to wire.

Components Needed for Installation

Before you start, gather all the required parts and tools. The Holley system is typically sold as a module, but you’ll need a few additional items to complete the installation. Here’s the full list:

  • Holley Two-Step Launch Control Module (Holley P/N 704-2) – This is the main brain of the system. It contains the circuitry for the dual-stage rev limiter and connects to the ignition coil.
  • Wiring Harness – Many sellers include a pigtail harness with the module, but sometimes it’s sold separately. Make sure you have the harness that connects the module to the ignition coil and the activation switch (for the clutch or transbrake).
  • Mounting Bracket or Panel – A simple metal bracket or even a piece of ABS plastic to secure the module inside the engine bay or under the dash.
  • Activation Switch – If your system doesn’t include one, you’ll need a momentary push-button or a switch that grounds the activation wire when you want to engage the first stage. Alternatively, you can wire it to the clutch pedal switch.
  • Miscellaneous Hardware – Butt connectors, heat shrink tubing, electrical tape, zip ties, ring terminals, and a couple of self-tapping screws.
  • Tools
    • Socket and ratchet set (metric and SAE)
    • Wire strippers and crimpers
    • Multimeter (for testing continuity and voltage)
    • Screwdrivers (Phillips and flathead)
    • Drill with small bits (if you need to mount the bracket)
    • Soldering iron (optional but recommended for a permanent connection)

Most car enthusiasts already own these tools, so we’ll assume zero cost for that category. However, if you’re starting from scratch, a basic tool set runs about $30–$50, still keeping you well under $500.

Cost Breakdown

Here’s an itemized cost estimate based on current market prices from major retailers like Summit Racing, Jegs, and Holley’s own store. Prices may vary slightly but should fit the under $500 budget.

  • Holley Two-Step Launch Control Module (704-2): $299.99
  • Wiring Harness (if not included): $39.99
  • Mounting Bracket: $15.00 (you can make your own from scrap metal for free)
  • Momentary Switch: $8.99
  • Miscellaneous Hardware: $15.00 (connectors, tape, terminals)
  • Tools (if not owned): $0 (assumed available or $40 extra)

Total (with harness and switch): $378.97
Total (if harness included): $339.98
Total with new tool set: $428.97

All scenarios come in well below $500, leaving you room to add a nicer switch or a dash-mounted indicator LED. You can also save money by buying a used module on forums like Camaro5 or LS1Tech, but inspect it carefully for damage.

Installation Process

Installing the Holley Two-Step is a weekend job for a DIYer with moderate electrical experience. The Camaro SS’s engine bay is relatively spacious, making access to the ignition coil straightforward. Follow these steps closely to avoid mistakes.

Step 1: Safety First – Disconnect the Battery

Remove the negative battery terminal and set it aside securely. Wait five minutes for the ECM capacitors to discharge. This prevents accidental shorts and protects the sensitive electronics in your Camaro.

Step 2: Locate the Ignition Coil

On the LS3 (fifth-gen Camaro SS), the coil packs are mounted on the valve covers. On the LT1 (sixth-gen), they are integrated into the spark plug wells, but the primary coil trigger wire is still accessible at the ECM harness or at the coil connector. Consult your specific service manual or a wiring diagram for the correct wire colors (typically a pink or white wire for the tach signal and a ground). The Holley module connects in series with the coil trigger wire that runs from the ECM to the coil. Because this is a common modification, many plug-and-play harnesses exist.

Step 3: Mount the Module

Choose a location for the Holley module that is away from direct heat sources (exhaust manifold, turbo, etc.) and moisture. Common spots include the passenger side inner fender well, the firewall, or under the dash near the ECU. Drill pilot holes if needed and secure the bracket with self-tapping screws or bolts. Ensure the module is oriented so that the wiring harness connector faces downward to prevent water from pooling in the connector.

Step 4: Wire the Module

Using the included wiring diagram (or the one from Holley’s website), connect the following wires:

  • Power (red wire): Connect to a switched 12V source (e.g., the ignition fuse in the under-hood fuse box).
  • Ground (black wire): Secure to a clean chassis ground point (sand any paint off for a good connection).
  • Coil input (white or pink wire): Cut the coil trigger wire coming from the ECM and connect the ECM-side wire to this input.
  • Coil output (white or pink wire): Connect this to the remaining wire that goes to the coil.
  • Activation input (green or blue wire): Connect to your momentary switch. One side of the switch goes to this wire, the other side goes to ground. When the switch is closed, it grounds the activation input, enabling the lower RPM limit.

For an automatic transmission, you can wire the activation input to the transbrake solenoid signal. For a manual, wire it to the clutch pedal switch so that the first stage is only active when the clutch is depressed.

Use solder and heat shrink for the coil wire splices; butt connectors can vibrate loose on a high-horsepower car. After all connections are made, zip-tie the harness away from any moving parts or sharp edges.

Step 5: Set the RPM Limits

Reconnect the battery. Start the engine and let it idle. The Holley module has two potentiometers (adjustment screws) on the side. One adjusts the low RPM limit (the launch stage), and the other adjusts the high RPM limit (the normal rev limiter). With the engine running and the activation switch engaged, slowly rev the engine until the low RPM limit cuts in. Adjust the screw accordingly. Then release the activation switch and rev the engine to verify the high limit is set correctly. Typical settings for a naturally aspirated Camaro SS are 3,000–3,500 RPM for the low stage and 6,500–6,800 for the high stage. For forced-induction cars, the low stage should be set to the boost threshold (often 3,500–4,200 RPM).

Step 6: Test on the Road (or Dyno) and Fine-Tune

Drive to a safe, empty area and perform a few practice launches. If the car bogs, increase the low RPM setting by 200 RPM. If it spins excessively, decrease it. The system is adjustable in seconds. Some owners also use a two-step to build boost at the line—if you’re turbocharged, you can floor the throttle with the activation switch engaged, and the rev limiter will hold the RPM while the turbo spools, giving you a much harder launch.

Additional Considerations

Tuning and Compatibility

The Holley Two-Step works well with stock LS and LT ECUs, but it intercepts the coil trigger signal. If your Camaro has an aftermarket ECU (like a Holley Terminator X or a MegaSquirt), you may already have built-in launch control; in that case, a standalone two-step is redundant. However, for owners using the stock GM ECM, this is an easy and effective add-on. Note that the stock ECM may set a P0606 diagnostic trouble code if the two-step slows the engine while the ECU expects a certain RPM; this is harmless and can be tuned out with HP Tuners or ignored.

Labor Costs

If you don’t want to install the system yourself, a performance shop will typically charge 1.5 to 2 hours of labor, which at $100–$150/hour brings your total to $525–$675. Still affordable, but the DIY approach keeps you under $500 and gives you the satisfaction of doing it yourself.

Two-step launch control is intended for off-road or drag strip use only. Using it on public roads is dangerous and may be illegal. Additionally, the high RPM limit must be set conservatively to avoid engine damage—make sure your valvetrain can handle elevated revs. The stock LS3/LT1 can safely rev to 6,800 RPM with good oil, but pushing beyond that requires stronger valve springs and pushrods.

Future Upgrades to Consider

Once you’ve mastered the two-step, you may want to add a line-lock (for burnout staging) or a transbrake for automatic cars. Some owners combine the two-step with a boost controller for turbo cars. The Holley system is also compatible with nitrous logic—you can wire the activation input so that nitrous only sprays when the second stage is active. This prevents nitrous injection during the launch, which can cause traction issues.

Benefits of the Holley Two-Step on a Camaro SS

  • Consistency: Eliminates driver variability at the tree. Every launch will hit the same RPM, making your reaction times more predictable.
  • Faster ETs: By holding the engine at the sweet spot, you reduce the time it takes to get up to speed. Many Camaro SS owners report 0.2–0.4-second improvements in quarter-mile times after installation.
  • Drivetrain Protection: The lower RPM limit prevents shock loading the transmission and rear end when you dump the clutch or release the transbrake. This can save your axles and driveshaft over the long term.
  • Easy Adjustability: You can change the launch RPM in seconds based on track conditions, tire temperature, or whether you’re running on drag radials or street tires.
  • Plug-and-Play with Stock Electronics: No need for a full standalone ECU or custom tune for the launch control to work. The Holley module operates independently of the ECM.

Common Pitfalls and How to Avoid Them

  • Incorrect Wiring: Double-check wire colors using a multimeter. A wrong connection can cause the engine to misfire or not start. The coil trigger wire is often the most confusing—find a wiring diagram for your specific Camaro year before cutting.
  • Overheating the Module: Mount the Holley module where it gets airflow. In a closed engine bay, it can get hot after multiple passes. Some owners mount it on the passenger side near the intake scoop for cooling.
  • Setting the Low RPM Too High for the Track: On a prepared drag strip, you can use a higher launch RPM. On a street or unprepared surface, reduce it by 500–1,000 RPM to prevent overwhelming tire grip.
  • Forgetting to Disable for Daily Driving: The two-step activation switch can be inadvertently pressed while driving, causing the engine to cut out at low RPM. Install a toggle switch in series with the activation switch so you can completely disable the system on the street.

Conclusion

Installing the Holley Two-Step Launch Control System on a Chevy Camaro SS is one of the most cost-effective performance upgrades you can make. For under $500, you gain the ability to launch with precision every time—reducing your ETs and making you more competitive at the track. The system is well-documented, the wiring is straightforward, and the DIY installation is achievable for anyone comfortable with basic electrical work. Whether you’re a weekend warrior or a seasoned bracket racer, the Holley Two-Step is a smart investment that delivers real-world results without breaking the bank.

For more information, check out the official product page on Holley's website, a detailed installation guide on Summit Racing, and helpful tips from the Camaro community on Camaro5 (search for "Holley Two-Step"). If you prefer a video walkthrough, the Powerteq Garage channel has a clear installation guide. Happy launching!