Clutch Masters 02-06 Acura RSX 2.0L Type-S 6 Sp (High Rev) / 02-06 Honda Civic SI 2.0L& 6...

Clutch Masters 08037-HRB6 is the FX500 six-puck race clutch for the six-speed K20: the 2002-2006 Acura RSX Type-S, the 2006-2011 Honda Civic Si and the 2006-2011 Acura CSX Type-S. It is aimed at drag and track cars making well beyond stock power, where an FX300 or FX400 still slips on a hard launch or a boosted upshift. Clutch Masters labels it race only.

What the FX500 does in a K20 six-speed

This is the top single-disc step in the Clutch Masters lineup for this car. The FX500 uses the Power Plus II pressure plate, a high-leverage design with heavy-duty straps and two stacked heat-treated diaphragms for very high clamp force. It is paired with a solid-hub, unsprung disc carrying six ceramic pucks. Clutch Masters rates it at a 200 to 400 percent increase in holding capacity and states it is SFI certified to spec 1.2 for NHRA, NDRA, IDRC, IHRA, SCCA and NASA competition. The trade-offs are spelled out by the maker: heavy pedal pressure, an on-off engagement, and chatter that makes it unsuitable for the street.

If the car is driven on the road, the sprung FX400 08037-HRC6 or the Kevlar FX300 08037-HRTZ are the better fit.

Symptoms that point to the clutch

• Clutch slips on launches or at high boost even after a Stage 3 or Stage 4 upgrade
• Rpm flares on fast power shifts at the top of second or third gear
• Glazed or heat-cracked friction surfaces at teardown
• Engagement point drifting as a worn disc loses thickness
• Bearing noise that comes and goes with pedal position

How to confirm before you buy

Log a full-throttle pull and compare engine speed to wheel speed; a step up in rpm without matching speed is slip. Verify the hydraulics fully release and re-engage, check for oil contamination from the rear main seal, and make sure the power level truly needs a race clutch. Our slipping diagnosis guide and the clutch chatter guide explain what to look for.

Fitment

Clutch Masters lists 08037-HRB6 for the 2002-2006 Acura RSX 2.0L Type-S six-speed, the 2006-2011 Honda Civic Si 2.0L six-speed and the 2006-2011 Acura CSX Type-S six-speed. Our listing title says 02-06 Civic Si, but the 2002-2005 Civic Si is a five-speed car and is not on the maker's list for this part. The base RSX five-speed is not on it either; that car uses the 08036 series. With swaps common on K-series cars, match the transmission by its old clutch or send us the year and VIN before it ships.

Install notes

• Clutch Masters ships the disc, pressure plate, throwout bearing, pilot bearing when applicable and an alignment tool. No flywheel is included.
• Resurface or replace the flywheel and clean both friction faces before assembly.
• Use the supplied tool to center the disc, then draw the pressure plate down evenly in a crisscross pattern.
• Expect a much heavier pedal. Healthy hydraulics matter; the master, slave and braided line kit is a sensible addition. Bleed with DOT 3 fluid.
• Refill the six-speed with Honda MTF.
• Follow the Clutch Masters break-in and expect the solid hub to add driveline noise.

Also consider the Competition Clutch Stage 4 rigid kit for comparison.

Which cars does 08037-HRB6 fit?

Clutch Masters lists the 2002-2006 RSX Type-S six-speed, the 2006-2011 Civic Si six-speed and the 2006-2011 CSX Type-S six-speed. It does not list the 2002-2005 Civic Si or the base RSX five-speed.

Is this an FX400 or FX500?

It is the FX500: Power Plus II pressure plate with a solid-hub six-puck ceramic disc, rated 200 to 400 percent over stock holding capacity.

Can I daily drive it?

Clutch Masters labels it race only. It engages instantly, has a heavy pedal and chatters, so a street car is better with the FX300 or FX400.

Is it legal for sanctioned racing?

Clutch Masters states the FX500 is SFI certified to spec 1.2 for NHRA, NDRA, IDRC, IHRA, SCCA and NASA.

What else should I replace with it?

Resurface or replace the flywheel and make sure the master and slave cylinders are healthy, since the pedal is much heavier. Use DOT 3 for the hydraulics and Honda MTF in the gearbox.

• How to Diagnose Transmission Slipping
• Shift Flare vs. Slip: How to Tell Them Apart
• Rebuild vs Replace vs Reman Transmission