Beanboy Posted October 15, 2006 Share Posted October 15, 2006 Why the hell can't people wrap their heads around the fact a manual subaru minus STI always has 50/50 torque split of engine output to the axles? There are NO ADDITIONAL CLUTCHES/GEARS that magically appear when one set of axles slip people. GRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR -B http://www.standardshift.com Link to comment Share on other sites More sharing options...
rao Posted October 15, 2006 Share Posted October 15, 2006 Because that isn't true. The viscous center diff will shift the split from 50/50. Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
Beanboy Posted October 15, 2006 Author Share Posted October 15, 2006 OMG YOU ARE ONE OF THEM! The CENTER DIFF IS NOT VISCOUS!!! GRRRRRRRRRR!!!!!! The center diff is set at 50/50!!! The viscous limited slip "locks" the diff..WHICH IS 50/50!!!!! BAN THE MOD!!!!! -B http://www.standardshift.com Link to comment Share on other sites More sharing options...
rao Posted October 15, 2006 Share Posted October 15, 2006 Would you like to place a wager on that? Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
Beanboy Posted October 15, 2006 Author Share Posted October 15, 2006 Yes! -B http://www.standardshift.com Link to comment Share on other sites More sharing options...
Beanboy Posted October 15, 2006 Author Share Posted October 15, 2006 Think about it... 50/50 split... Diff locks because of slip... becomes a "one piece" driveshaft. How can the torque split change? Hmm? Acts just like a part-time 50/50 truck system when it is "locked" or a Haldex system when locked. -B http://www.standardshift.com Link to comment Share on other sites More sharing options...
rao Posted October 15, 2006 Share Posted October 15, 2006 I don't need to think about it because I already know the answer Place your bet and then get ready to pay up. Just so we are clear: The Legacy (GT, and 2.5i) have a center viscous differential which shifts torque between the front and rear axles based on the variation in tire toration speed (slip) between the front and rear axles. Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
G.T.Subie Posted October 15, 2006 Share Posted October 15, 2006 Denial is your best friend Link to comment Share on other sites More sharing options...
Beanboy Posted October 15, 2006 Author Share Posted October 15, 2006 IT DOES NOT! All it does is a speed diff occurs the viscous limited slip tries to lock the center diff, and since the center diff is 50/50... First of all, the center diff is not viscous, it is geared. Only thing viscous is the limited slip coupler. From what you describe, I can call a truck locked 50/50 system the same thing... Put a 60 year-old pickup truck in 4WD. Put front wheels on ice, rear on pavement. What happens? OMG! Center diff shifts torque rear? No, it is a locked 50/50 system... -B http://www.standardshift.com Link to comment Share on other sites More sharing options...
PhilT Posted October 15, 2006 Share Posted October 15, 2006 Does this video help to explain it at all ? http://legacygt.com/forums/showthread.php?t=45631 If it's locked at 50/50, then how come the front and back wheels can spin at different speeds ? Double Award Winning Legacy GT Wagon Link to comment Share on other sites More sharing options...
rao Posted October 15, 2006 Share Posted October 15, 2006 IT DOES NOT! All it does is a speed diff occurs the viscous limited slip tries to lock the center diff, and since the center diff is 50/50... First of all, the center diff is not viscous, it is geared. Only thing viscous is the limited slip coupler. From what you describe, I can call a truck locked 50/50 system the same thing... Put a 60 year-old pickup truck in 4WD. Put front wheels on ice, rear on pavement. What happens? OMG! Center diff shifts torque rear? No, it is a locked 50/50 system... It is not a "locked" 50/50 system. If it didn't have the viscous diff (which it does) and was a conventional open differential then all of the torque would go to the axel that had no traction and was spinning. Your description of the trucks center diff has nothing to do with t he Legacy's viscous center differential. Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
Beanboy Posted October 15, 2006 Author Share Posted October 15, 2006 Because the viscous diff doesn't fully lock, eventhough it tries to. And because of that, it actually has a touch more power to the wheels that slip a little more than the wheels that grip, hehe. OMG! Using a truck system to prove a point? The Subaru system tries to fully lock, it really can't, so in fact it isn't quite as good as a fully locked system in slippery environment. -B http://www.standardshift.com Link to comment Share on other sites More sharing options...
Beanboy Posted October 15, 2006 Author Share Posted October 15, 2006 http://www.main.experiencetherave.com:8080/subaru_manual_scans/FSM_Scans/AWDMT_description.jpg "The center differential uses a highly reliable, bevel gear" "In addition, the the viscous coupling serves as a differential-action control to eliminate a mechanical lock mechanism" -B http://www.standardshift.com Link to comment Share on other sites More sharing options...
Beanboy Posted October 15, 2006 Author Share Posted October 15, 2006 Only a few cars have a center diff that actually can change torque split...STI being one of them. -B http://www.standardshift.com Link to comment Share on other sites More sharing options...
mickeyd2005 Posted October 15, 2006 Share Posted October 15, 2006 From the 2007 Subaru Legacy Brochure: CONTINUOUS AWD Legacy models equipped with the 5- or 6-speed manual transmissions use a viscous-locking center differential. Should wheel slippage occur, it helps transfer power to the wheels with the most traction. The center diff starts at 50/50 but when the oil heats up due to slipping, the viscosity changes and the torque split changes. Even if it doesn't lock, it will change the torque split. Link to comment Share on other sites More sharing options...
rao Posted October 15, 2006 Share Posted October 15, 2006 Only a few cars have a center diff that actually can change torque split...STI being one of them. What are you talking about? All Subaru's do it. Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
Beanboy Posted October 15, 2006 Author Share Posted October 15, 2006 Not sure what cars on the road actually have a true viscous center diff. I know the Porsche 996 AWD and earlier did. -B http://www.standardshift.com Link to comment Share on other sites More sharing options...
-TT- Posted October 15, 2006 Share Posted October 15, 2006 i like debates. they are fun to read. Link to comment Share on other sites More sharing options...
Vimy101 Posted October 15, 2006 Share Posted October 15, 2006 Link to comment Share on other sites More sharing options...
rao Posted October 15, 2006 Share Posted October 15, 2006 There is no debate, the Legacy has a viscous center differential and it varies the torque split between the front and rear axles. Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
Metal2You Posted October 15, 2006 Share Posted October 15, 2006 There is no debate, the Legacy has a viscous center differential and it varies the torque split between the front and rear axles. Yeah, that was my understanding when I bought the car. Apparently up to 90% of the torque can be delivered to either the front or rear axle. 50/50 split is just the "default." Link to comment Share on other sites More sharing options...
Beanboy Posted October 15, 2006 Author Share Posted October 15, 2006 A non-STI manual subaru can't do this: - VDC and the Transmission Control Module In addition to its transmission shift control duties, the Transmission Control Module (TCM) aids wheel traction. When a loss of traction is detected, the VDC system signals the Transmission Control Module (TCM) to adjust power distribution between the front and rear wheels, helping to ensure that the wheels with the best traction receive the most power. -B http://www.standardshift.com Link to comment Share on other sites More sharing options...
Beanboy Posted October 15, 2006 Author Share Posted October 15, 2006 Fine, a locked partime truck system has 0/100 to 100/0 system then, hehe. And Haldex? That's the same then! 0/100 to 100/0... -B http://www.standardshift.com Link to comment Share on other sites More sharing options...
-TT- Posted October 15, 2006 Share Posted October 15, 2006 There is no debate, the Legacy has a viscous center differential and it varies the torque split between the front and rear axles. i believe you, just saying this thread was fun to read Link to comment Share on other sites More sharing options...
gfxdave99 Posted October 15, 2006 Share Posted October 15, 2006 ROTFLMAO Whether it's tackling a gravel-strewn FIA WRC special stage, or simply running into standing water on tarmac, keeping your car stable by getting the best possible traction is vital. That's where the technology of our torque distribution system sets Subaru apart from conventional 4-wheel drive set-ups. Evolved from the very outset specifically for Symmetrical AWD, it actively distributes engine torque to individual wheels - not just to front or rear axles, as some others do. In fractions of a second, our smart system automatically adjusts the amount of torque, giving maximum grip and stability wherever and whenever it's needed - not only in extreme conditions, but in everyday driving. The result is dynamic handling that feels truly intuitive, making the car behave like an extension of the driver's body and mind. So, even when road conditions change unexpectedly, torque distribution plays a crucial role in achieving the goal of stability and control. http://www.subaru-global.com/about/awd/performance/index.html If everything seems under control, you're just not going fast enough. - Mario Andretti Link to comment Share on other sites More sharing options...
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