ACT 1999 Acura Integra HD/Perf Street Sprung Clutch Kit
ACT AI4-HDSS is a complete heavy duty street clutch kit for the 1994-2001 Acura Integra and the other B-series Hondas that share its clutch. It is the kit most owners pick when the factory clutch is worn out and the car is stock or lightly modified: an intake, exhaust or header on a GS-R or LS, a daily-driven Type R, or a del Sol VTEC that slips when the revs climb. It adds holding power over stock while keeping a pedal that is comfortable in traffic.
The clutch connects the B18 engine to the five-speed gearbox. When the pedal comes up, the pressure plate diaphragm clamps the disc against the flywheel and torque passes into the input shaft. AI4-HDSS pairs ACT's H025 Heavy Duty pressure plate, which uses a revised diaphragm to raise clamp load and reduce deflection, with the 3000105 Performance Street sprung disc. That disc is 220 mm (8.7 in) across with a steel-backed organic lining high in copper for heat transfer, a sprung hub to soak up driveline shock, and reduced marcel for quicker shifts.
ACT rates the kit at 245 ft-lb at the crank, 31 percent over the factory clutch, and describes the pedal as light to moderate with smooth engagement. That is the right range for a naturally aspirated B18 with bolt-ons. If the engine has a turbo, a big cam package or sees drag launches, step up to the AI4-XTSS Xtreme street kit instead.
Clutch wear does not set a check engine code, so test it on the road. Warm the car, select fourth at about 2,500 rpm and floor it; if the tach jumps while the car barely accelerates, the disc is slipping. Our slipping diagnosis guide walks through the test and the flare versus slip article helps separate a clutch problem from a shifting habit. Before blaming the disc, check that the hydraulic release is not holding the bearing against the fingers, and look for oil from the rear main seal on the bellhousing, since an oil-soaked disc slips no matter how new it is.
Our listing names the 1999 Acura Integra. ACT's application chart for AI4-HDSS covers a wider range of the same clutch: the 1994-2001 Integra 1.8L five-speed (B18B1, B18C1 and B18C5, so LS, RS, GS, GS-R, Special Edition and Type R), the 1994-1997 Civic del Sol VTEC, the 1999-2000 Civic Si, and the 1998-2001 CR-V. The input shaft spline is 1-1/32 in. Earlier 1990-1993 Integras use a different clutch and are not covered. If your car has had a transmission swap, match the gearbox, not the badge, and send us the year and VIN if you are unsure. More options are in our rebuild kits collection.
| Brand | ACT |
| Part number | AI4-HDSS |
| Fits | ACT 1999 Acura Integra HD/Perf Street Sprung Clutch Kit |
| Vehicle fitment | Acura Integra Hd/Perf (1999) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
ACT lists it for the 1994-2001 Integra 1.8L five-speed with the B18B1, B18C1 or B18C5, which covers the LS, RS, GS, GS-R, Special Edition and Type R. Automatic cars and 1990-1993 Integras are not covered.
ACT's chart also lists the 1994-1997 Civic del Sol VTEC, the 1999-2000 Civic Si and the 1998-2001 CR-V with the B-series engine.
ACT rates AI4-HDSS at 245 ft-lb at the crank, 31 percent over stock. That suits stock and bolt-on B18 engines; turbo or high-compression builds should look at the XT kits.
Per ACT: H025 Heavy Duty pressure plate, 3000105 Performance Street sprung disc, RB817 release bearing, PB1002 pilot bearing and AT88 alignment tool. The flywheel is sold separately.
Somewhat. ACT says to expect 15 to 40 percent more pedal effort with its Heavy Duty plates and describes this kit as light to moderate effort.
Yes. ACT recommends 300 to 500 miles of mild engagement such as normal stop-and-go driving before hard launches or track use.
