Introduction: Unlocking the Full Potential of Your S2000 AP2

The Honda S2000 AP2 represents the pinnacle of Japanese roadster engineering, with its F22C1 engine revving to 8200 RPM and chassis that rewards precise driving. Yet even this masterpiece can benefit from forced induction. The JR Supercharger Kit (produced by Jackson Racing) is a proven, reliable way to add 80–100+ horsepower to the rear wheels while retaining the car’s linear power delivery and crisp throttle response. This expanded guide takes you beyond the basic steps, offering torque specs, tips from experienced installers, and critical pre‑installation checks. Whether you’re a seasoned DIYer or a first‑time supercharger installer, these instructions will help you complete the job safely and correctly.

Tools and Materials: What You’ll Really Need

Beyond the obvious list, investing in the right tools and consumables will save you frustration. Here’s a detailed inventory:

  • JR Supercharger Kit – ensure it includes the Rotrex C30‑94 supercharger, bracket, belt, intercooler (if your kit is intercooled), high‑flow injectors (usually 550cc or 750cc), fuel pressure regulator, intake piping, couplers, clamps, air filter, and mounting hardware.
  • Socket and ratchet set – ¼‑in, ⅜‑in, and ½‑in drive with metric sockets (8mm to 19mm).
  • Torque wrench – ⅜‑in drive for small fasteners, and a ½‑in drive for critical bolts (e.g., bracket bolts, crank pulley).
  • Allen wrenches (hex keys) – metric sizes, especially 4mm, 5mm, 6mm.
  • Pry bar or seal puller – for removing the factory belt tensioner.
  • Pick set and hook tool – helps with hose clamp removal and vacuum line routing.
  • Vacuum hose – 3.5mm and 4mm silicone hose (optional if you need to replace any brittle factory hoses).
  • Engine oil – 5W‑30 or 10W‑30 synthetic (check kit recommendations; some require a specific viscosity after supercharger installation).
  • Coolant – Honda Type 2 or equivalent.
  • Shop towels, brake cleaner, and thread locker – blue Loctite for bracket bolts, red for critical fasteners if specified.
  • Fender covers and floor jack with jack stands – safety first.

Preparation: Setting the Stage for Success

Proper preparation prevents half‑finished projects. Allocate a full weekend (or two) and work in a clean, well‑lit area.

Step 1: Disconnect the Battery

Disconnect the negative terminal and secure the cable away from the battery post. Wait 15 minutes for the ECU capacitors to discharge. This prevents accidental airbag deployment and short circuits when working near the engine bay.

Step 2: Drain Fluids and Remove Components

  • Drain the engine oil and replace the oil filter (use a quality filter, not a cheap aftermarket).
  • Drain the coolant at the radiator petcock and engine block drain bolt.
  • Remove the factory air intake assembly, air box, and intake tube.
  • Remove the engine cover (four 10mm bolts) and set aside.
  • Remove the drive belt (serpentine belt) using a 14mm wrench on the tensioner pulley.
  • Remove the radiator fan shroud (two 10mm bolts at the top and two at the bottom) to gain clearance for the supercharger bracket.
  • Remove the alternator (two 14mm bolts) – this makes bracket installation far easier.

Installing the Supercharger Bracket

The bracket is the foundation of the whole system. Take your time to align it perfectly.

Step 3: Install the Main Bracket

  • Clean the engine block mounting surfaces with brake cleaner.
  • Apply a small amount of blue Loctite to the bracket bolts (supplied in kit – typically M10 x 1.25, M8 x 1.25, and M6 x 1.0).
  • Position the bracket against the driver‑side of the engine, aligning with the A/C compressor mounting holes, the alternator bracket, and the lower timing cover holes.
  • Torque values: M10 bolts to 44 ft‑lbs (60 N·m), M8 bolts to 22 ft‑lbs (30 N·m), M6 bolts to 9 ft‑lbs (12 N·m). Use the torque wrench; overtightening can strip the block threads.
  • Re‑install the alternator and torque its bolts to 33 ft‑lbs (45 N·m).

Step 4: Mount the Supercharger Unit

  • The Rotrex supercharger should be bolted to the bracket using the supplied M8 bolts. Do not tighten fully until the belt is aligned.
  • Slide the supercharger pulley onto the shaft, install the key, and tighten the pulley nut to 60 ft‑lbs (81 N·m). Use a strap wrench to hold the pulley.
  • Rotate the supercharger by hand to ensure smooth bearing operation – no noise or roughness.
  • Install the idler pulley and tensioner pulley supplied with the kit. Apply blue Loctite.
  • Route the new, shorter serpentine belt per the kit’s diagram: crank pulley → supercharger pulley → idler → tensioner → A/C (if retained) → alternator → back to crank.
  • Release the tensioner to take up slack. Rotate the crank pulley clockwise (by hand) several times to verify belt tracking. Adjust supercharger position if the belt runs toward the front or rear of the pulley flanges.
  • Tighten the supercharger mounting bolts to 22 ft‑lbs (30 N·m).

Connecting the Intake and Intercooler System

Step 5: Install the Intake Piping

  • Attach the cast aluminum intake elbow to the supercharger outlet using a silicone coupler and T‑bolt clamps. Tighten clamps to 35 in‑lbs (4 N·m) – do not overtighten or the silicone can tear.
  • Route the charge pipe to the intercooler (if equipped) or directly to the throttle body. Use rubber hose supports if provided to prevent vibration fatigue.
  • If your kit includes an air‑to‑air intercooler, mount it in front of the radiator using supplied brackets. Be mindful of clearance to the hood latch and A/C condenser.
  • Connect the blow‑off valve or bypass valve (if included) per instructions. Most JR kits use a recirculating valve to maintain drivability.
  • Attach the air filter to the supercharger inlet. Position it in a cool area behind the driver‑side headlight – avoid hot radiator air.

Step 6: Install Fuel Injectors and Fuel Pressure Regulator

  • Remove the fuel rail (two 10mm bolts). Carefully pull injectors from the rail – push the retaining clips inward.
  • Install the supplied high‑flow injectors. Lubricate O‑rings with clean engine oil or vaseline to prevent tearing.
  • Re‑install the fuel rail. Torque bolts to 8 ft‑lbs (11 N·m).
  • Mount the adjustable fuel pressure regulator (FPR) on the firewall or near the fuel rail. Connect it inline with the return fuel line. Set base pressure to 58 psi (4.0 bar) with the vacuum line disconnected – this is the standard for most JR supercharger calibrations.
  • Reconnect the battery briefly and cycle the key to prime the fuel system, then check for leaks.

Finalizing the Installation

Step 7: Connect Vacuum Lines and Sensors

  • Plug the supercharger bypass valve vacuum line into a manifold vacuum source (typically the port on the intake manifold that originally fed the EVAP system).
  • If your kit includes a boost gauge, tee into the manifold vacuum line.
  • Install the IAT (intake air temperature) sensor supplied with the kit into the charge pipe. Connect it to the harness extension (if required).
  • Ensure all vacuum lines are secured with zip ties; use silicone hose for any replacements.

Step 8: Refill Fluids and Double‑Check Everything

  • Refill engine oil – use the spec recommended by Jackson Racing (often 5W‑30 synthetic). Fill to the upper mark on the dipstick.
  • Refill coolant using a funnel to burp air pockets. Start with the heat on full, then add coolant until the radiator is full and the reservoir is at the MAX line.
  • Inspect all clamps, bolts, and hoses. Re‑torque the crank pulley bolt (if removed for intercooler bracket installation) to 180 ft‑lbs (244 N·m) with the proper tool (crank pulley holder).
  • Check belt tension: the belt should deflect approximately ½ inch (12mm) at the longest span when pressed firmly.

Testing and Tuning Essentials

Step 9: Reconnect the Battery and Perform a Pre‑Start Check

  • Reconnect the negative terminal. Ensure no tools or rags are left in the engine bay.
  • Key on, engine off: listen for the fuel pump prime, check for leaks at the fuel rail and FPR.
  • Crank the engine without starting (by pulling the fuel pump relay or fuse) for 10 seconds to build oil pressure. Replace relay/fuse.

Step 10: Start the Engine

  • Start the engine and let it idle. Initially keep RPM below 2500 for the first few minutes. Listen for belt squeal (re‑tension if needed) and check for coolant or oil leaks.
  • Monitor dashboard and scan tool for any check engine lights. Common initial codes: P0101 (MAF), P0171 (lean) – these are normal if the ECU hasn’t been calibrated yet.
  • Allow the engine to reach operating temperature. The cooling fans should cycle on and off.

Tuning and Calibration

The JR Supercharger Kit typically comes with a FlashPro or K‑Pro ECU calibration (depending on your year and region). Do not drive the car hard without loading the correct calibration. If you purchased a used kit, source the current map from Jackson Racing or an authorized tuner. For optimal results, schedule a dyno tune with a professional who has experience with Rotrex‑supercharged F22C engines. Expect 290–320 whp on a safe pump‑gas tune.

For more tuning resources, see Hondata’s S2000 support page and the S2KI Forced Induction forum for community‑tested maps.

Maintenance and Long‑Term Care

Supercharged S2000s require a slightly different maintenance schedule:

  • Oil changes every 3000 miles – use a high‑quality synthetic. Rotrex units share engine oil, so cleanliness is critical.
  • Belt inspection every 5000 miles – replace at the first sign of glazing or cracking.
  • Supercharger oil level – Rotrex has its own oil reservoir (if unit is self‑contained) or shared with engine. Consult kit manual; some require periodic changing of the supercharger oil.
  • Intercooler core cleaning – if you drive in wet or dusty conditions, spray out the intercooler fins with a gentle stream of water.
  • Check all hoses and clamps annually – silicone degrades over time; replace couplers every 4‑5 years.

For detailed maintenance intervals, refer to the Jackson Racing instructions page.

Common Pitfalls and Pro Tips

  • Belt slip under high boost: If you hear a screech at 6000 RPM, the tensioner may need a tighter setting. Some installers upgrade to a larger idler pulley for better wrap.
  • Coolant temperature creep: The supercharger adds heat. Consider an aftermarket aluminum radiator and a lower‑temperature thermostat (160°F) if you plan to track the car.
  • Fuel system limitations: Stock fuel lines can support ~350 whp, but beyond that you’ll need a return‑style system. The JR kit is designed for 300–320 whp, so you’re safe.
  • Intake heat soak: Wrap the charge pipe with reflective DEI heat tape if you live in a hot climate.
  • Clutch upgrade: With increased torque, the stock AP2 clutch may slip. Budget for a Stage 1 or 2 organic clutch if you plan to drive aggressively.

Conclusion: Enjoy the Boost

Installing the JR Supercharger Kit on your S2000 AP2 transforms an already exhilarating car into a serious track‑day weapon. The kit is well‑engineered, the instructions are generally clear, and the community support is outstanding. By following this expanded guide—paying attention to torque values, belt alignment, and proper ECU calibration—you’ll avoid common rookie mistakes and enjoy many miles of reliable, forced‑induction fun. Remember, the key to a successful build is patience and preparation. Happy boosting!