Unlocking the Full Potential of the Honda S2000

The Honda S2000 remains a benchmark for front-engine, rear-wheel-drive sports cars, largely thanks to its naturally aspirated F20C and later F22C engines. These high-revving powerplants produce exceptional specific output, but the path to 350 wheel horsepower naturally aspirated is expensive and often impractical for daily driving. Turbocharging offers a proven, repeatable route to reliable four-digit power levels while maintaining street manners. This guide focuses on turbo kits built around Garrett and Precision components, two manufacturers known for engineering excellence and real-world durability. Whether you are building a weekend canyon carver or a dedicated track toy, the right turbo kit transforms the S2000 into a different animal.

Why Garrett and Precision Components?

Both Garrett Motion and Precision Turbo & Engine have earned their reputations through decades of motorsport and aftermarket development. Garrett's GT and GTX series feature advanced billet compressor wheels, low-inertia turbine designs, and dual ball-bearing center sections that spool quickly and survive sustained high-rpm operation. Precision components, particularly the 6266 and 6262 turbos, use proprietary billet wheels and patented bearing systems that balance airflow and durability. Choosing a kit from a reputable fabricator that uses these core turbos ensures you are not fighting poor-quality castings or questionable wastegate designs. These kits are not just about the turbocharger itself; they include properly sized intercoolers, mandrel-bent piping, high-flow intake and downpipe configurations, and often a tuned ECU calibration to get the car running safely from the start.

Top Turbo Kits for 350+ Horsepower

The following kits are currently the most popular and proven options for Honda S2000 owners targeting 350 to 600+ wheel horsepower. Each kit is engineered for specific power goals, response characteristics, and budget levels. All three use either a Garrett or Precision turbocharger as the core component.

1. Garrett GTX2867R Gen II Kit (Full Race or Inline Pro)

The Garrett GTX2867R Gen II is the modern evolution of the classic GT28RS. This 52-trim turbo features a 57mm billet compressor wheel and an advanced aerodynamics design that flows 47 lb/min, enough for 400+ wheel horsepower on a properly supported F20C. The dual ball-bearing core and .64 or .86 A/R turbine housing options allow for excellent spool characteristics, with full boost coming on as early as 3500–3800 RPM. This makes the GTX2867R an ideal choice for street cars where immediate throttle response matters.

  • Power output: 350–420 whp on 91‑93 octane; up to 480 whp on E85.
  • Spool characteristics: 18–20 PSI by 3800 RPM with a 3-inch downpipe.
  • Included components: Cast or tubular manifolds, Tial wastegate and BOV, air‑to‑air intercooler, all silicone couplers and T‑bolt clamps.
  • Compatibility: Fits both AP1 and AP2; requires relocation of the battery or use of a small Odyssey battery in some kits.

This is the go‑to kit for drivers who want to retain the high‑rev charm of the S2000 while adding meaningful torque across the entire rev range. It is often paired with a 3.5‑inch exhaust system and a Hondata FlashPro or MoTeC M1 for tuning.

2. Precision 6266 Turbo Kit (Ballade Sports or SOS Performance)

The Precision 6266 is a 66mm inducer, 62mm exducer billet turbo capable of supporting 600+ wheel horsepower. Unlike smaller turbos, the 6266 uses a Gen 2 compressor wheel with a 67.3mm inducer that flows over 70 lb/min. The .81 A/R T4 turbine housing and P‑trim wheel provide a good balance of top‑end power and moderate spool times. With a properly sized manifold and 3‑inch exhaust, boost builds from 4200 RPM and pulls hard to the 8500‑RPM redline.

  • Power output: 450–650 whp depending on boost, fuel, and engine build.
  • Spool characteristics: 15–18 PSI by 4500 RPM with a divided T4 twin‑scroll manifold.
  • Included components: Full Race or Ballade Sports divided T4 manifold, Tial 44mm wastegate, Precision ProLine blow‑off valve, triple‑pass intercooler.
  • Compatibility: Requires a built bottom end (forged rods and pistons) for any boost over 18 PSI; AP1 and AP2 both accommodated.

The 6266 is the standard for S2000 owners who plan to invest in a fully built engine, upgraded fueling, and a race‑spec ECU. It delivers dyno charts that stay flat from 5500 RPM to redline, making it a popular choice for time‑attack and road‑race applications.

3. Full Race Motorsports Twin Scroll Kit (Garrett G30-770 or Precision 6479)

Full Race is renowned for its twin‑scroll manifold designs that optimize exhaust pulse separation. Their S2000 kit can be spec’d with a Garrett G30-770 (70mm) or Precision 6479 (66mm/72mm). The twin‑scroll configuration improves turbine efficiency by 10–15% over open T4 setups, resulting in faster spool and higher peak power. With a G30‑770, the kit supports 550–700 whp while spooling like a much smaller turbo.

  • Power output: 500–750 whp on high‑boost pump gas or E85.
  • Spool characteristics: 25 PSI by 4500 RPM with the G30‑770; 20 PSI by 4800 RPM with the 6479.
  • Included components: 321 stainless steel twin‑scroll manifold, BorgWarner EFR or Garrett turbine housing options, Tial 44mm wastegates (dual in some configurations), V‑band downpipe.
  • Compatibility: Requires extensive engine bay modifications (relocate brake booster, wire tuck) and a full fuel system upgrade. Not for the faint of heart.

This is the ultimate kit for owners who want every last horsepower from a street‑legal, emissions‑legal (with proper tuning) S2000. It demands a professional build but rewards with an experience that rivals exotics.

Supporting Modifications for a Reliable 350+ HP Build

Bolting on a turbo kit is only the beginning. To safely achieve 350 wheel horsepower and beyond, the following components must be addressed:

  • Fuel system: 1000cc‑1200cc injectors, a Walbro 525 or AEM 340 lph pump, and a fuel pressure regulator are minimums for 350 hp. For 500+, step up to a surge tank and twin pumps.
  • Engine internals: The F20C’s factory pistons and rods can handle up to about 400 whp with conservative tuning and good octane. Beyond that, forged pistons (CP, Mahle) and rods (Manley, Eagle) are mandatory.
  • Engine management: Hondata FlashPro is the most common and accessible option for 350‑500 whp. MoTeC M1, Haltech Elite, and AEM Infinity are preferred for higher power levels or advanced features like traction control and anti‑lag.
  • Intercooler and piping: A large 3‑inch to 4‑inch core bar‑and‑plate intercooler is essential to keep inlet air temperatures below 120°F. Mandrel‑bent 2.5‑inch to 3‑inch piping minimizes pressure drop.
  • Intake and exhaust: A 3.5‑inch diameter cold‑air intake and a 3‑inch mandrel‑bent turbo‑back exhaust are required for power goals above 350 whp.
  • Cooling system: Upgraded aluminum radiator, high‑flow thermostat, and possibly an oil cooler to maintain stable temperatures during sustained pulls.
  • Drivetrain: The stock AP1 differential and axles can fail above 400 whp under hard launches. A stage‑2 clutch (e.g., ACT, Exedy) and a differential cooler are wise upgrades.

Installation and Tuning Considerations

Even the best turbo kit will underperform or cause damage if installation and calibration are rushed. Key points to keep in mind:

  • Professional installation: While a skilled DIYer can install a Full Race or Ballade Sport kit, expect 30–50 hours of labor. Welding tabs, modifying charge piping, and routing coolant lines require a meticulous approach. A shop experienced with S2000 builds can complete the job in three to five days.
  • Engine bay preparation: Removing the factory airbox and cleaning out debris prevents ingestion of foreign objects. Some kits require cutting the inner fender liner for the intake pipe; plan accordingly.
  • Initial start‑up and fueling check: Before any full‑throttle runs, verify fuel pressure and check for leaks with a boost leak tester. A leaking coupler or wastegate actuator can cause lean conditions.
  • Tuning process: Use a wideband oxygen sensor (AEM, PLX) to monitor air‑fuel ratio. For 350‑450 whp, a conservative tune targeting 11.5:1 at peak torque and 12.0:1 at high RPM on pump gas is safe. On E85, leaner mixtures (12.5:1) are acceptable but require injector scaling and dynamic tables.
  • Ignition timing: Modern ECUs can adjust timing per cylinder. For a 350‑hp build, keep peak torque timing at 18–20 degrees BTDC and taper to 14–16 degrees at redline to avoid knock.
  • Post‑installation checks: Perform a heat‑cycle session (no boost) to ensure oil return is adequate. Then proceed with a low‑boost run (5–7 PSI) before turning up the boost controller.

Frequently Asked Questions

Can I achieve 350 whp with a stock internal F20C using a Garrett GTX2867R?

Yes. With 14–18 PSI of boost from a GTX2867R and a safe tune, the factory F20C can reliably produce 350–380 whp. The stock block is known to hold up to about 400 whp with conservative timing and good fuel. However, the factory head gasket and head studs should be upgraded during the turbo installation to minimize risk.

What is the best turbo for a street‑driven S2000?

The Garrett GTX2867R Gen II provides the best balance of response and power for street use. It spools quickly and delivers a linear power curve that complements the S2000’s chassis dynamics.

Do I need a built transmission for 350 hp?

The stock AP1 and AP2 transmissions are robust and often handle 400 whp without issues, provided you avoid frequent hard launches. Clutch upgrade is recommended; a stage‑1 or stage‑2 disc with a heavy‑duty pressure plate is sufficient for 350 whp.

How much does a complete turbo kit installation cost?

A complete turbo kit (turbo, manifold, intercooler, piping, wastegate, BOV) costs $4,500–$7,500. With supporting mods (fuel system, ECU, clutch, cooling) and professional installation, the total often reaches $10,000–$15,000. Tuning adds another $500–$1,500.

Are there any emissions concerns?

Turbocharging will affect emissions characteristics. A proper tune can keep the car within legal limits for most states, but visual inspection may fail if the catalytic converter is removed. Some kits offer a catted downpipe option.

Final Thoughts

Turbocharging a Honda S2000 with a Garrett or Precision‑based kit is one of the most satisfying modifications you can make. The combination of high‑revving character and forced induction creates a driving experience that few other cars can match. Whether you choose a quick‑spooling GTX2867R for daily driving or a power‑oriented Precision 6266 for track work, the key is to invest in a quality kit from a reputable fabricator, support it with the necessary fuel and cooling upgrades, and entrust the tuning to someone who understands the nuances of the F20C/F22C engine. With proper preparation, a 350‑plus‑horsepower S2000 is not just achievable—it is reliable, thrilling, and deeply rewarding.

For further reading and parts sourcing, visit Garrett Motion, Precision Turbo & Engine, and Full Race Motorsports. For community‑based build advice, the S2KI forum remains an invaluable resource.