{"product_id":"909-motorsport-m5-abs-kit-subaru-wrx-gd-sti","title":"909 Motorsport M5 ABS Kit Subaru WRX GD - STI","description":"\u003cp\u003e\u003cstrong\u003eBosch Motorsport M5 ABS Kit for Subaru WRX GD (and GD STI)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis is a \u003cstrong\u003eBosch Motorsport M5 ABS\u003c\/strong\u003e kit for the GD-chassis Subaru WRX, built around a wheel speed sensor package developed front and rear, with a rear option to suit GD STI hubs.\u003c\/p\u003e\n\u003cp\u003eAt the heart of the system is the \u003cstrong\u003eBosch Motorsport M5 ABS\u003c\/strong\u003e, a professional-level motorsport unit used in racing worldwide. The M5 provides ultra-fast processing, highly accurate wheel slip control, and configurable ABS strategies for track use. Eleven selectable calibrations on a 12-position map switch allow the ABS behaviour to be tuned for tyres, surface conditions, and driving style.\u003c\/p\u003e\n\u003cp\u003eGD Subarus turn up everywhere from tarmac rally to circuit, usually with the driveline and suspension long since sorted and the braking control still stock. The sensing on this platform is what makes or breaks a motorsport ABS conversion, so it has been developed properly at both ends of the car, for WRX or STI hubs.\u003c\/p\u003e\n\n\u003ch3\u003eThe problem with factory ABS in competition: what track drivers call “ice mode”\u003c\/h3\u003e\n\u003cp\u003eABS works by holding each tyre near a target slip ratio, the difference between wheel speed and vehicle speed, where 0% is a freely rolling tyre and 100% is a locked one. Peak braking force sits somewhere between the two, and exactly where depends on the tyre and the surface. The cycling you feel through the pedal is the system chasing its target, and while it’s in slip control, pressing harder adds nothing; extra pedal force won’t be sent to a tyre the system already considers at its limit.\u003c\/p\u003e\n\u003cp\u003eRoad-car calibrations have to be built conservatively: one calibration must stay safe on every surface a road car can meet, down to the very worst. Under genuine circuit braking (real speed, semis or slicks, kerbs and bumps working the tyre) that conservative logic can settle on a slip target far below the grip actually available. The result is what drivers call ice mode: the system refuses to build brake pressure no matter how hard you stand on the pedal, and the only way out is to come almost completely off the brake, let the wheels match the car’s speed, and reapply. If you braked at the limit for the corner, that margin doesn’t exist.\u003c\/p\u003e\n\u003cp\u003eIt isn’t a fault, and pads, fluid or bigger discs won’t touch it. It’s a road calibration operating outside the envelope it was designed for.\u003c\/p\u003e\n\u003cp\u003eMotorsport ABS approaches the problem from the other direction: the driver selects the calibration for the tyre and conditions actually in use, and the system controls to a slip target appropriate for genuine circuit grip. Eleven selectable calibrations on the 12-position map switch cover the range from wet circuit to slicks, chosen before the braking zone, not discovered during it.\u003c\/p\u003e\n\n\u003ch3\u003eWhat’s Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBosch Motorsport M5 ABS control unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFront wheel speed sensors and adapters\u003c\/strong\u003e: common to WRX and STI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRear wheel speed sensors and adapters\u003c\/strong\u003e to suit \u003cstrong\u003eWRX hubs\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSTI rear option\u003c\/strong\u003e: different rear mounting parts to suit the larger STI hub and bearing\u003c\/li\u003e\n\u003cli\u003eStainless mounting hardware for the supplied components\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eBrake lines from the master cylinder to the hydraulic unit are made to suit the vehicle at install: 909 specifications call for Goodridge or Speedflow hardware.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWRX or STI rear hubs\u003c\/h3\u003e\n\u003cp\u003eThe front sensing is the same part across both cars. At the rear it isn’t: the STI runs a larger hub and bearing, so the sensor mounting hardware differs. Choose the rear option that matches what is actually fitted to your car, not the badge on the boot, because GD builds swap this assembly often enough that it is worth a look before ordering. If you’re unsure, send us a photo of the rear hub and we’ll tell you which one you need.\u003c\/p\u003e\n\n\u003ch3\u003eHydraulic unit and cabin mounting\u003c\/h3\u003e\n\u003cp\u003eOne thing to know up front: no 909 hydraulic unit mounting or in-cabin hardware is offered for the GD platform. Those are chosen and made at install to suit the individual build, and given how differently these cars get built for tarmac rally versus circuit, that has been the sensible way to do it.\u003c\/p\u003e\n\u003cp\u003eSo everything else is here, and the hydraulic unit location, cabin hardware and brake lines are handled at install with 909 guidance drawn from the cars we have already been through.\u003c\/p\u003e\n\n\u003ch3\u003eKey Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFront and rear sensing engineered for the platform\u003c\/strong\u003e rather than fabricated per car\u003c\/li\u003e\n\u003cli\u003eCommon front parts across WRX and STI, with a dedicated rear option for the larger STI hub and bearing\u003c\/li\u003e\n\u003cli\u003eHonest scope: hydraulic unit and cabin mounting are chosen at install, with 909 guidance\u003c\/li\u003e\n\u003cli\u003eEleven selectable ABS calibrations for slicks, semi-slicks, wet circuit and loose-surface work\u003c\/li\u003e\n\u003cli\u003eProven Bosch Motorsport reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications: Bosch Motorsport M5 ABS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl Strategy:\u003c\/strong\u003e High-speed multi-channel wheel slip control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaps:\u003c\/strong\u003e Eleven selectable calibrations on a 12-position map switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInputs:\u003c\/strong\u003e 4x wheel speed sensors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutputs:\u003c\/strong\u003e Hydraulic modulation via Bosch Motorsport valve block\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBosch Motorsport M5 vs Factory ABS\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003cth\u003eFactory GD WRX \/ STI ABS\u003c\/th\u003e\n\u003cth\u003eBosch Motorsport M5 ABS Kit\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTechnology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEarly-2000s road-car ABS module\u003c\/td\u003e\n\u003ctd\u003eModern, high-speed multi-channel motorsport ABS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProcessing Speed\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLimited, slower ECU response\u003c\/td\u003e\n\u003ctd\u003eUltra-fast ECU with real-time wheel slip control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eABS Maps\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle, fixed road calibration\u003c\/td\u003e\n\u003ctd\u003eEleven selectable calibrations for different tyres and conditions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWheel Speed Sensing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFactory sensors and tone rings, tuned for stock hubs\u003c\/td\u003e\n\u003ctd\u003eMotorsport sensors with front adapters common to both cars and rear adapters for WRX or STI hubs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDriver Control\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003eDriver-selectable map switch, adjustable between sessions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFactory fit\u003c\/td\u003e\n\u003ctd\u003eVehicle-specific kit with developed front and rear sensing; hydraulic unit mounting, cabin hardware and lines are made at install with 909 guidance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePerformance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAdequate for road use; limited under hard braking\/track\u003c\/td\u003e\n\u003ctd\u003eMotorsport-level braking performance for the track\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAdjustability\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003eAdjustable for tyres, surface conditions, and driver preference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Which cars does this kit suit?\u003c\/strong\u003e\u003cbr\u003e\nA: The GD-chassis Subaru WRX. The front sensing is common across WRX and STI; at the rear, choose the option matching the hubs actually fitted to your car.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I know whether I need the WRX or STI rear option?\u003c\/strong\u003e\u003cbr\u003e\nA: The STI hub and bearing are larger, and the rear mounting parts differ accordingly. GD builds swap hubs often, so check what’s on the car rather than what it left the factory with, or send us a photo and we’ll confirm.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the kit include hydraulic unit and cabin mounting?\u003c\/strong\u003e\u003cbr\u003e\nA: No, and we’d rather say so plainly. Everything else is here, the M5 and the developed front and rear sensing for your hubs, but the hydraulic unit location, cabin hardware and brake lines are made at install, with our guidance. See the section above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: My factory ABS has never caused a problem. Why replace it?\u003c\/strong\u003e\u003cbr\u003e\nA: Because the problem shows up at competition pace under maximum braking, which is precisely when you can’t afford it. A road calibration has to stay safe on every surface a road car might meet, so at real speed on semis or slicks it can settle on a slip target well below the grip you actually have, and refuse to build pressure no matter how hard you push the pedal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need special tools or skills to install the kit?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes, more so than our full integration kits, because the hydraulic unit mounting is designed at install alongside the brake lines. Professional installation is strongly recommended. We can install and commission the system in our Newcastle workshop, or supply the kit with our guidance behind your own builder. We cover the whole job, brackets to commissioning, in \u003ca href=\"\/blogs\/news\/what-a-bosch-motorsport-abs-m5-install-actually-involves\"\u003ewhat a Bosch Motorsport ABS M5 install actually involves\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can you ship this kit overseas?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes. These are 909 vehicle-specific kits and we ship them worldwide. Contact us for freight to your country.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the system validated for road use?\u003c\/strong\u003e\u003cbr\u003e\nA: No, Bosch Motorsport ABS is for track usage only.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I adjust the ABS behaviour?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes. The kit includes a driver-selectable map switch with eleven selectable calibrations, allowing ABS response to be tuned for dry, wet or low-grip conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this kit suit a LHD car?\u003c\/strong\u003e\u003cbr\u003e\nA: We have not had access to a LHD vehicle for testing. For the right pilot customer we would be willing to work together on testing, please get in touch via the contact page.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What's the difference between the Clubsport, Kit 1 and Kit 2 core options?\u003c\/strong\u003e\u003cbr\u003e\nA: Every option includes the same M5 system and the same 909 platform hardware. The Clubsport core uses Bosch's universal harness, the right choice for most club and time-attack builds. Kit 1 moves to a vehicle-specific loom and supports the M5's advanced control functions for cars with real aero or braking beyond about −2 g, and Kit 2 adds Autosport-specification connectors at the wheel-speed sensor leads for endurance-style service schedules. Our \u003ca href=\"\/blogs\/news\/which-bosch-abs-kit-clubsport-vs-kit-1-vs-kit-2\"\u003ekit comparison guide\u003c\/a\u003e covers the choice in detail.\u003c\/p\u003e","brand":"909 Motorsport","offers":[{"title":"WRX \/ Clubsport Kit","offer_id":47888590602462,"sku":"909ABS_WRX_GD","price":13840.0,"currency_code":"AUD","in_stock":true},{"title":"STI \/ Clubsport Kit","offer_id":48541165355230,"sku":"909ABS_WRX_GD_STI","price":13840.0,"currency_code":"AUD","in_stock":true},{"title":"WRX \/ Kit 1","offer_id":48541165387998,"sku":"909ABS_WRX_GD_K1","price":22240.0,"currency_code":"AUD","in_stock":true},{"title":"STI \/ Kit 1","offer_id":48541165420766,"sku":"909ABS_WRX_GD_STI_K1","price":22240.0,"currency_code":"AUD","in_stock":true},{"title":"WRX \/ Kit 2","offer_id":48547662463198,"sku":"909ABS_WRX_GD_K2","price":24410.0,"currency_code":"AUD","in_stock":true},{"title":"STI \/ Kit 2","offer_id":48547662495966,"sku":"909ABS_WRX_GD_STI_K2","price":24410.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0764\/9162\/0574\/files\/IMG_9845.jpg?v=1785577999","url":"https:\/\/www.909motorsport.com.au\/products\/909-motorsport-m5-abs-kit-subaru-wrx-gd-sti","provider":"909 Motorsport","version":"1.0","type":"link"}