Understanding the S2000 AP1

The Honda S2000 AP1, produced from 1999 to 2003, remains a benchmark for affordable rear-wheel-drive sports cars. Its heart is the legendary 2.0-liter F20C engine, which originally produced 240 horsepower at a stratospheric 8,300 RPM and a redline of 9,000 RPM. This naturally aspirated masterpiece, combined with a lightweight chassis and a near-perfect 50/50 weight distribution, delivers an unfiltered driving experience that has earned a passionate following. The AP1’s quick steering ratio (13.6:1) and double-wishbone suspension provide razor-sharp turn-in and exceptional feedback. However, as the car ages and enthusiast expectations evolve, many owners find themselves craving more power to match the chassis’ capability. This has made supercharging one of the most popular modifications for the S2000 AP1.

The Appeal of Supercharging

Supercharging offers a distinct advantage over turbocharging: instant, linear power delivery that preserves the S2000’s responsive nature. Unlike a turbocharger, which builds boost with exhaust flow and introduces lag, a supercharger is belt-driven from the crankshaft, providing immediate throttle response. For the S2000 AP1, this means the engine’s high-RPM character is enhanced without sacrificing the connection between the accelerator and the rear wheels. Two main supercharger types are common for the F20C: centrifugal superchargers (such as those from Vortech, ProCharger, and Jackson Racing) and roots/twin-screw positive displacement units (like the SOS Performance or Harrop TVS1320). Centrifugal units offer high top-end power, while positive displacement blowers deliver more low-end torque and a broader torque curve. Both can transform the S2000 into a genuinely fast car, but the choice depends on driving style and goals.

Performance Gains – What to Expect

Horsepower and Torque Numbers

A well-tuned supercharged AP1 can produce between 330 and 420 horsepower at the wheels, depending on boost pressure, intercooling, and supporting modifications. That’s a 40–80% increase over the stock rear-wheel output (typically around 190–210 whp). Torque, which is often criticized as lacking in the stock F20C, jumps from about 120–130 lb-ft to 200–250 lb-ft. This makes the car significantly quicker in everyday driving and on track. Most owners report 0–60 mph times dropping from the high 5-second range to the mid-4-second range, with quarter-mile times improving from the mid-14s to the low 13s or high 12s.

Dyno Tuning and Boost Levels

Safe, reliable setups run approximately 6–10 psi of boost with a proper intercooler. Pushing beyond 12 psi on stock internals requires careful tuning and often leads to diminishing reliability. Reputable tuners, such as those at ScienceofSpeed or SOS Performance, recommend sticking with a conservative tune using a quality standalone ECU like a Hondata or AEM. A conservative build yields 300–330 whp, which is more than enough to make the S2000 feel substantially faster while retaining daily-driver manners.

Breakdown of Costs

Supercharger Kits

Complete supercharger kit prices range from $3,000 to $7,000. Entry-level centrifugal kits (e.g., Jackson Racing’s or Vortech’s base offerings) start around $3,200–$4,500. Premium kits such as the SOS Performance twin-screw or Harrop/Hi-Torque positive displacement kits cost $5,500–$7,000. These prices typically include the supercharger unit, mounting brackets, belt drive, intercooler or pre-cooler, intake piping, blow-off valve, and fuel management components. However, not all kits include everything needed for a safe install – some require additional purchases.

Installation Costs

Professional installation by a shop experienced with S2000s adds $1,000 to $2,500 depending on labor rates and the complexity of the kit. A typical job takes 15–20 hours. DIY installation is possible for mechanically skilled owners, but mistakes can be costly. Expect to pay extra if you need custom piping or unexpected fabrication.

Supporting Modifications

To handle the increased air and fuel, you’ll need upgraded fuel injectors (typically 550–750cc), a high-flow fuel pump (e.g., Walbro 255), and often a larger radiator or oil cooler. Many owners also add a stronger clutch (e.g., ACT or Exedy) and a limited-slip differential upgrade. Budget $1,500–$3,500 for these supporting parts. Additionally, a proper tune on a dyno costs $400–$800 and is non-negotiable for reliability.

Ongoing Maintenance

Supercharged S2000s require more frequent maintenance. Oil changes every 3,000–4,000 miles with high-quality synthetic oil are essential. Spark plugs should be replaced every 15,000 miles. The supercharger itself may require rebuilds every 40,000–60,000 miles, costing $400–$800. The added heat and stress also accelerate wear on the cooling system and drive belts. Annual inspections are recommended.

Real Owner Feedback and Experiences

Online forums like S2KI and YouTube channels dedicated to S2000 builds provide a wealth of owner insights. Common themes emerge from those who have supercharged their AP1s:

  • Thrilling Power Increase: Owners consistently report that the car feels transformed. The enhanced torque makes the car more forgiving in traffic and easier to drive briskly without constantly revving to 9,000 RPM. Many say the car finally has “proper sports car power.”
  • Improved Daily Usability: The additional low-end torque (especially with positive displacement kits) smooths out the driving experience. The car no longer falls on its face below 5,000 RPM, making stop-and-go traffic less frustrating.
  • Reliability – Not a Simple Bolt-On: While many owners enjoy trouble-free miles, reliability issues are frequently mentioned. Heat management is the biggest challenge. Without an effective intercooler and adequate cooling system, intake air temperatures skyrocket, and the engine is prone to detonation. Several owners warn that a cheap intercooler or no oil cooler can lead to catastrophic failure within months.
  • Cost Creep: Almost every owner comments that the initial kit price is only the beginning. Once you factor in clutch, differential, tuning, and inevitable repairs, the total investment often doubles. One owner on S2KI noted, “I spent $5k on the kit, $2k on installation, $2k on supporting mods, and then another $1k on a blown engine rebuild six months later because I skimped on the tune.”
  • Resale Value Impact: Some owners report that finding a buyer for a supercharged S2000 is easier because the power is desirable, but others say the potential for reliability issues reduces the pool of interested buyers. Insurance premiums may also increase, as modified cars are often considered higher risk.

Maintenance and Longevity Considerations

To keep a supercharged AP1 running strong, owners must be meticulous. Oil coolers are strongly recommended – the F20C already runs hot at 220–230°F under heavy load; boost adds 30–50°F. A quality engine oil cooler (e.g., Setrab or Mocal) is a wise investment. Upgraded radiators (Koyo or Mishimoto) with higher capacity and dual electric fans help maintain stable coolant temps. Additionally, the factory clutch often slips above 300 whp, so a stage 2 or stage 3 clutch kit is almost mandatory. Differentials – especially the stock AP1 unit – can fail under repeated hard launches. Many owners swap in an OS Giken or AP2 differential for stronger gears and better oil flow. Finally, never skip regular compression and leak-down tests. A healthy engine with good compression is critical before adding boost; some owners rebuild the bottom end with stronger rods and pistons preemptively to handle higher boost levels safely.

Alternatives to Supercharging

Supercharging isn’t the only path to more power. Turbocharging offers higher peak numbers (400+ whp is common on a built motor) but with more lag and installation complexity. A well-sorted turbo kit from companies like LoveFab or Full Race can produce 450–500 whp, but requires extensive supporting work. For those who cherish the high-RPM N/A feel, a naturally aspirated build using high compression pistons, aggressive cams, ported head, and header/exhaust can yield 260–280 whp while retaining throttle response and reliability. However, such builds are expensive (often $8,000–$12,000) and still fall short of supercharged torque. For budget-conscious owners, a simple intake, exhaust, and tune (which adds 10–20 whp) may suffice, but few enthusiasts find that satisfying after a year. Ultimately, supercharging strikes the best balance between cost, power increase, and daily usability for most AP1 owners.

Is It Worth the Investment?

There is no universal answer – it depends entirely on your goals, budget, and tolerance for maintenance. If you prioritize an unfiltered, raw driving experience and prefer the stock responsiveness, leaving the AP1 naturally aspirated may be the smarter choice. However, if you find the stock power lacking for spirited driving or track use, and you have the budget for a quality kit plus all supporting modifications (expect $8,000–$12,000 total for a reliable setup), then supercharging is absolutely worth it. The car becomes significantly more enjoyable, with power that matches its legendary handling. Just be prepared for the higher running costs and potential headaches. Buy a proven kit from a reputable manufacturer, invest in professional installation and tuning, and maintain a diligent service schedule. When done correctly, a supercharged S2000 AP1 remains one of the most rewarding driver’s cars on the road – a true enthusiast’s investment that pays dividends in smiles per mile.