Understanding the S2000's Engine and the Need for Forced Induction

The Honda S2000, produced from 1999 to 2009, is revered for its naturally aspirated F20C and later F22C engines. These powerplants are engineering marvels, delivering class-leading specific output – over 120 hp per liter in the early Japanese versions. The F20C, with its 9,000 rpm redline and high compression ratio of 11.0:1, was designed for peak power at high revs. While this makes for an exhilarating driving experience, the torque curve is relatively flat and the engine feels anemic below 6,000 rpm. For many enthusiasts, the desire for stronger mid-range punch and a broader power band leads them to forced induction. Among the available options, the Comptech supercharger has earned a strong reputation for providing a substantial, reliable power increase without sacrificing the S2000’s essential character.

Supercharging offers distinct advantages over turbocharging for this platform: immediate throttle response, simpler installation (no complex exhaust manifold or oil lines), and a linear power delivery that complements the S2000's chassis balance. Comptech, a pioneer in Honda performance since the 1980s, developed a supercharger system specifically for the S2000 that has been proven on street and track alike. This article details how a Comptech supercharger can add 50+ horsepower to your S2000 and what you need to know to get the most from the upgrade.

The Comptech Supercharger System – Overview and History

Comptech’s Roots in Honda Performance

Comptech was founded in the early 1980s by two Honda engineers who began developing performance parts for the CVCC and later the CRX and Integra. By the time the S2000 was introduced, Comptech had already established itself as a leading source for supercharger kits on the CR-V and Prelude. Their approach to the S2000 was methodical: they chose the Eaton Roots-type supercharger (MP62) because of its compact size, excellent low-to-mid-range boost characteristics, and proven reliability in OE applications (including the Mercedes-Benz M111 engine and the Mini Cooper S). The kit was designed as a full, intercooled system that could be installed with hand tools and a weekend of work.

How the Comptech Kit Works

The core of the system is the Eaton MP62 supercharger, driven by a dedicated serpentine belt off the crankshaft. Air is drawn through a high-flow intake filter, compressed by the supercharger to about 6-8 psi (depending on pulley combination), then routed through an air-to-air intercooler mounted behind the front bumper. The compressed, cooled air then enters a cast aluminum intake manifold that replaces the stock plastic unit. The supercharger mounts on the passenger side of the engine, using a custom bracket that also tensions the drive belt. The fuel system is upgraded with larger injectors (usually 440-550cc), and a fuel pressure regulator or auxiliary fuel controller is provided. The kit was originally supplied with a generic tune that worked with a piggyback ECU or a reflash, but modern installations typically require a standalone ECU for best results.

Dyno-Proven Gains: How 50+ HP is Achieved

Baseline and Expected Numbers

A stock AP1 S2000 (F20C) produces about 195-210 whp on a typical dyno. A properly tuned AP2 (F22C) will show around 210-220 whp. The Comptech supercharger kit, when installed with the supplied pulley and a conservative tune, consistently yields 260-275 whp on a Dynojet. That’s an increase of 50-65 horsepower at the wheels. With a smaller supercharger pulley (the kit offers a 6-psi and an 8-psi option), or additional supporting mods, owners have seen 290-310 whp. This power is delivered with a near-seamless curve – boost builds quickly from 2,500 rpm and holds strong to redline. The torque increase is even more dramatic: stock torque around 130-140 lb-ft jumps to 190-210 lb-ft, giving the car the low-end grunt it lacked from the factory.

Why 50+ HP is a Conservative Estimate

The 50 hp figure cited in many product descriptions is intentionally conservative because it assumes a stock engine, no tuning adjustments beyond the supplied fuel controller, and a safe air-fuel ratio. In practice, with proper tuning and an upgraded fuel system, gains of 70-80 hp are common. The intercooler keeps intake air temperatures in check, preventing knock and allowing more aggressive timing. The Roots design also provides instant boost: at 3,000 rpm, the engine is already making 5 psi, which translates to a massive increase in daily-drivable torque. For drivers who autocross or track their cars, this powerband transformation is ideal because it reduces the need to keep the engine screaming above 7,000 rpm to make passes.

Installation Process and Considerations

Preparation and Required Skills

The Comptech supercharger kit is considered one of the more straightforward forced induction installations for the S2000. The manifold, supercharger, intercooler, and piping all bolt on without cutting or welding. However, the job requires mechanical confidence and a full set of tools: socket set, torque wrench, belt tension gauge, and a lift or jack stands. Most owners opt to have a professional install the kit, costing 8-12 hours of labor. DIY installation takes a careful weekend.

Step-by-Step Overview

  1. Prepare the Engine: Disconnect the battery, drain the coolant, and remove the intake manifold, throttle body, and stock airbox.
  2. Install the Intercooler: Mount the intercooler core behind the front bumper, using the provided brackets. This requires removing the front bumper cover, headlights, and crash bar for access.
  3. Mount the Supercharger Bracket: The aluminum bracket bolts to the engine block on the passenger side. Ensure it is flat – minor warping can cause belt alignment issues.
  4. Install the Supercharger: Bolt the Eaton unit to the bracket. Attach the new belt tensioner and route the drive belt. The belt routing is critical; ensure the tension is within spec to prevent slip.
  5. Replace the Intake Manifold: The Comptech manifold replaces the stock composite manifold. Use new gaskets and torque the bolts to spec (18 N·m).
  6. Plumb the Piping: Connect the supercharger outlet to the intercooler inlet, then the intercooler outlet to the throttle body using silicone couplers and T-bolt clamps.
  7. Upgrade the Fuel System: Remove the stock injectors and install the supplied larger injectors. Install the fuel pressure regulator or voltage clamp if included.
  8. Reconnect Electronics: Plug in the MAF sensor, IAT sensor, and any piggyback ECU or tuning module. Secure all wiring away from heat.
  9. Fill Fluids: Refill coolant, check engine oil, and prime the supercharger with a small amount of oil (the Eaton unit has its own oil supply – verify the dipstick).
  10. Initial Start and Check for Leaks: Crank the engine without starting to prime the fuel system. Start and check for vacuum leaks (spray carb cleaner near seams while idling).
  11. Professional Tuning: Even the most complete kit requires a final tune on a dyno. The supplied base map is safe but leaves power on the table.

Common Pitfalls

  • Belt Alignment: The pulley on the supercharger must align perfectly with the crank pulley. If not, use shims or adjust the bracket position.
  • Clearance Issues: Some 2004+ S2000 models have different power steering line routing; you may need a $20 relocation bracket.
  • Insufficient Fuel Pump: On higher boost levels (above 8 psi), the stock fuel pump will struggle. Upgrade to a Walbro 255lph pump before going above 275 whp.
  • Overheating: The intercooler core reduces radiator airflow. If you track the car, consider a higher-flow radiator and an oil cooler.

Tuning the S2000 for Boost

The Comptech supercharger will not run optimally on the stock ECU map. The increased air density requires more fuel and altered ignition timing to prevent knock. Early kits used a simple rising-rate fuel pressure regulator (FMU) that added fuel under boost – a crude method that often caused rich conditions and potential misfires. Modern best practice is to use a standalone engine management system such as Hondata K-Pro (via a K-swap adapter? No, for F-series you need Hondata FlashPro or AEM EMS). Many owners choose the Piggyback ECU from Comptech's own kit which was a repurposed GReddy e-manage. Today, the preferred options are:

  • Hondata FlashPro: Works with OBDII AP2 ECUs. Provides full control over fuel, spark, and boost compensation tables.
  • AEM Infinity or EMS-4: For those comfortable wiring a standalone. Offers the best features but requires full harness integration.
  • ECU Reflash: Some tuners (like Science of Speed or LHT Performance) offer reflashed stock ECUs with custom maps for Comptech kits.

A proper dyno tune by a specialist familiar with boosted S2000s is essential. Expect to pay $500-$900 for tuning. The tuner will optimize air-fuel ratio (target 11.5:1 under full boost), ignition timing (conservative for pump gas), and set the boost cut and knock control. The result is a reliable 260-280 whp with no detonation.

Supporting Modifications for Maximum Performance

To extract the full potential of the Comptech supercharger – and to ensure durability – consider these supporting upgrades:

  • Fuel System: As mentioned, a Walbro 255 or AEM 340lph fuel pump plus properly sized injectors (550cc for 275-300 whp, 750cc for higher). A fuel pressure regulator set to 58 psi base pressure.
  • Exhaust: A high-flow catalytic converter or test pipe and a 3-inch cat-back exhaust reduce backpressure. Expect 5-10 hp gain. Popular choices: GReddy, HKS, Invidia, or custom.
  • Intake: The Comptech kit includes a conical air filter. For better flow at high RPM, replace it with a larger cold air intake filter box from a company like AEM or K&N.
  • Cooling System: Boost increases engine heat. A Koyo or Mishimoto aluminum radiator and a lower-temperature thermostat are recommended. For track use, add an oil cooler and consider a hood vents for airflow.
  • Drivetrain: With 50-80 more horsepower, the stock clutch may slip. A Stage 2 or Stage 3 clutch from ACT, Competition Clutch, or Exedy handles the torque. Also consider a lighter flywheel for quicker revs.
  • Differential: The S2000’s Torsen diff can handle the power, but if you increase boost beyond 8 psi, a reinforced diff mount is wise to avoid axle tramp.

Reliability and Longevity

Engine Internals

The stock S2000 engine is remarkably robust. The F20C and F22C have forged connecting rods and oil squirters that cool the pistons. With proper tuning and good fuel, the engine can handle up to 350 whp reliably. The Comptech kit at 6-8 psi (260-280 whp) is well within this safety margin. At these power levels, the stock clutch, transmission, and differential are reliable if not abused. However, sustained high-RPM use with boost (track days) stresses the cooling system and oiling. Using a high-quality synthetic oil like Mobil 1 5W-30 or Torco SR-5 and changing it every 3,000 miles helps. The supercharger itself requires periodic gear oil changes (Mobil 1 synthetic gear oil 75W-90) every 15,000 miles.

Heat Management

The biggest enemy of a supercharged S2000 is heat soaking. On hot days or during extended runs, the intercooler may become heat-soaked, reducing its efficiency. This can lead to knock and power loss. Solutions include: upgrading to a k-series intercooler core (larger), adding a water/methanol injection kit (e.g., Snow Performance or Devil’s Own), or installing a ducting system to direct more air to the intercooler. A hood riser also helps extract hot engine bay air.

Cost and Value Comparison

The Comptech supercharger kit for the S2000 is no longer in production, but complete used kits typically sell for $2,500-$3,500 on forums like S2KI or eBay. A new kit when available was around $3,900. Adding a used kit with installation and tuning runs roughly $4,500-$5,500. Compare this to a turbocharger system (e.g., Full Race or LoveFab) that can cost $5,000-$7,000 plus installation and tuning – and delivers 350-500 whp but with more complexity and heat. Another supercharger option is the Jackson Racing supercharger (roots-type, similar to Comptech) or the SOS Vortech centrifugal kit. The Comptech offers a proven, linear powerband with excellent drivability at a moderate cost. For the enthusiast seeking a 250-280 whp daily driver with low maintenance, the Comptech kit is an outstanding value.

Conclusion

Installing a Comptech supercharger on your Honda S2000 is one of the most satisfying and effective performance upgrades available. With proven gains of 50-80 horsepower at the wheels, improved torque across the rev range, and an immediate throttle response that never feels laggy, the transformation is transformative. The kit's well-engineered components, combined with proper tuning and supporting modifications, yield a reliable setup that can be enjoyed on the street, at autocross, or on road courses. While it requires a modest investment of time and money, the result is an S2000 that feels like a bigger, faster car without losing its nimble character. For those looking to unlock the true potential of their S2000, the Comptech supercharger remains a benchmark choice.

For more information and owner experiences, check out the Supercharger section on S2KI.com, Comptech’s archived page on the Wayback Machine, and tuning guides from Science of Speed. If you’re planning the upgrade, connect with your local Honda performance tuner to ensure a seamless installation and a safe, high-power result.