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Article Comments - 2009 Subaru Forester XT First Drive and Full Test
67 messages, Last post on Feb 09, 2009 at 12:16 PM
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First Drive: 2009 Subaru Forester XT - First Impressions: The style factor is up, but so is the practicality.(more)
Full Test: 2009 Subaru Forester 2.5XT Limited - Bottom Line: Bigger and better, the quirky little Forester has become a grown-up SUV. (more)
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Replying to: rich505 (Sep 03, 2008 11:20 am) Let us know how you like it. |
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"...the torque split for the AWD system constantly varies according to acceleration, deceleration and wheel slip, and as much as 100 percent of power can be directed to the wheels with the most grip." This is not correct. I sent an email to Subaru asking the questions about the torque split, and got reply from them as below: ------------------------------------------------ Thank you for contacting Subaru Canada, Inc. The Forester does not have a Variable Torque Distribution (VTD) centre differential. For the 2009 model year, the Forester 2.5XT includes a Multi-plate Transfer (MPT) System that adjusts torque from 60/40 (F/R) to 50/50 (or anywhere in-between) depending on throttle input, road conditions and input from the Vehicle Dynamics Control (VDC) System. VDC operates like most electronic stability control (ESC) systems in that it can adjust engine output, adjust individual brake pressure and even front rear torque distribution to retain/regain vehicle stability. It is not possible for the system defeat the role of the centre differential and thus torque output will always be split between the front and rear differential. Meaning, the system cannot direct 100% of power to a single wheel - whether it be with VTD or MPT. We trust this information is helpful. Sincerely, Rosanne Kernerman Bilingual Consumer Support Representative After Sales 1-800-894-4212 www.subaru.ca
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Replying to: henrylw (Nov 18, 2008 7:44 am) However, you can also install a fuse to defeat the AWD (for cases w/ emergency spare or other). At that point, Forester reverts to a FWD car, and I assume all the engine power is available for the FWD.
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Replying to: kurtamaxxxguy (Feb 06, 2009 1:00 pm) The FWD fuse disengages the rear axle completely, so 100/0 is possible. I think people mis-use the term 50/50. I think a lot of people mean the two axles are locked when they say that. Example with a viscous coupling: Let's say the front axle is on ice. At first the front wheels slip, but then the VC locks the two axles together, and the power is transmitted to the rear axle. If the two axles are truly locked together, the fact is the front axle is really getting no power at all, or perhaps only enough to overcome the inertia needed to spin the front tires at the same speed as the rears. So locked is not the same as 50/50. Locked means the power will go to whichever axle has grip. I think that's what they mean when they say "50/50". |
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