![]() The bellhousing and input shaft were changed for the Subaru EJ engine, the first was used until about 1998, when a major redesign of the holding devices was released. This transmission was released in 1988 for use in the Subaru XT6 and Leone Touring Wagon. VTD was introduced on the Alcyone SVX in 1991 and is usually found in performance models equipped with a turbocharger, along with the VDC outback and USDM 2003-2004 Legacy GT/2.5GT.ĪCT and VTD are found in both generations of the 4 speed while the 5 speed uses only VTD. The active clutch operation is similar to the ACT system, although the clutch is used to suppress differential action instead of as the differential itself. VTD adds a twin planetary center differential to the clutch and therefore has a static, starting torque split calculated on the planetary gear ratio, with the most common being 45:55. This system is the more commonly used setup used on most Subaru products after its introduction on the XT6. ![]() Later attempts at reducing customer confusion resulted in torque split numbers being given, but these have no meaning as there is no mechanical or other device to provide a static starting point for the control unit. Vehicles with higher power engines use a more aggressive model resulting in generally higher rear engagement. ![]() The control unit can and does alter torque several times per second. The effect is a constantly and actively changing torque to the rear wheels anywhere from a few percent to fully locked. The control unit monitors several factors including vehicle speed, gear position, and wheel speed and then varies the application of the clutch based on a model stored in memory. ACT drives the front wheels directly and the rear wheels through a hydraulic clutch. Subaru uses two types of traction delivery systems, called Active Torque Split (ACT), or the performance oriented Variable Torque Distribution, called VTD. It was available in FWD and Full-time awd. Subaru built their own four-speed automatic transmission based on the old Jatco design. The 3AT was a hydraulically controlled 3AT with available Single-Range 4WD. Since the 2014 model year, the conventional automatic transmissions in North American-spec Subaru vehicles have been replaced with Lineartronic CVTs (with one exception : the BRZ)Īll of Subaru's three speed automatic transmissions were made by Jatco. Subaru manufactures its own manual and CVT transmissions (for non- Kei cars). Subaru motor vehicles have used manual, conventional automatic, and continuously variable (CVT) transmissions.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |