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Old 04-07-2000, 02:22 PM   #1
D-man
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Join Date: Feb 2000
Location: BC, Canada / WA, US
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1999 2.5 RS
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Question How does AWD work?

How does AWD work on a normal day? Is it actually FWD? Or is it "all time 4WD"?
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Old 04-07-2000, 03:45 PM   #2
Robin2
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Chapter/Region: E. Canada
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All time all wheel drive....

Manual tranny has a 50-50 set-up while the automatic tranny has 90% front to 10% in the back (in normal driving conditions) but this fluctuates readily when needed more traction in the rear....

RObin
National Capital Subaru Club
www.ottawasubaru.com
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Old 04-07-2000, 04:02 PM   #3
Ver.III
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Robin2,
Try 60-40,rear to front on the RS. 50-50 is mostly on the STI competition center diffs (except the adjustable one) Automatics, I dunno

Rich
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Old 04-07-2000, 04:08 PM   #4
Vege
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Yeah, automatics have 90/10. It switches to 60/40 I think when you begin to lose traction.
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Old 04-07-2000, 07:47 PM   #5
altibaby
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I don't know if this info is right. Actually I happened to call Subaru Canada tech service this afternoon, one tech representive said automatics WILL switches to 50/50...if we jack up the front 2 wheels, there will be 50% power to the rear 2 wheels. But he didn't know about how much % of power will be transfered between the 2 rear wheel(left <-> right) by limited-slip rear differential if one of the rear wheel lose traction. Any idea?

[This message has been edited by altibaby (edited April 07, 2000).]
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Old 04-08-2000, 08:40 AM   #6
Yeoman
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I think the best answer you'll get is on the Checkpoint Web site. Check the links. It'll be under the TECH section.
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Old 04-10-2000, 05:11 PM   #7
Mike Moffa
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guys, you should check Subaru USA site, they explain everything..
http://www.subaru.com/awd/inside.html

50/50 for manual
and 90/10 front/rear for automatic, transfer up to 50/50 when needed

Take care
Mike M.

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Old 12-23-2006, 09:44 PM   #8
flat-4wagon
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For those searching for the answers:

http://www.subarudrive.com/SubaruDri...emystified.htm
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Old 12-23-2006, 10:15 PM   #9
SubiePilot
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This has to be the oldest thread I have ever seen be resurrected.
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Old 12-23-2006, 11:30 PM   #10
wrxfool
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Thread of X-mas past
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Old 12-23-2006, 11:44 PM   #11
Yannerd
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Haha this is before the bugeye eh!
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Old 12-24-2006, 11:28 AM   #12
andys
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Quote:
Originally Posted by Ver.III View Post
Robin2,
Try 60-40,rear to front on the RS. 50-50 is mostly on the STI competition center diffs (except the adjustable one) Automatics, I dunno

Rich
Rich, you obviously have a dererved subie guru status but I am very sure that my VIII tranny is heavily rear biased with the dccd off. It drives that way and the tranny charts confirm a 65:35 RF open diff bias. Now with dccd locked my RF torque split is variable between 0:100 and 100:0. Thing about it; lift the front wheels and accelerate: 100:0. Lift the rears and accelerate: 0:100. 50:50 (or any fixed split) does not equal locked diff. 50:50, by very careful and ingenious design, is OPEN diff.

Any locker, or LSD allows the torques to variably split so that a slippery wheel can receive very little torque while the tractive wheels can get torqued on. Wheels that slip to the wheels that grip. For that to happen you need a system where the the torque can be varied. Sounds complicated? Not really. Subaru advertises a system that monitors traction and sends torque form the wheels that slip to the wheels that grip. Marketing. Sigh. What is the fastest responding mechanical system that will transfer torque from the wheels that slip to the wheels that grip???? Weld the diffs. Three welded diffs will automatically and very rapidly transfer torque to the wheels that grip in an infinitely variable fashion with an impossible to predefine torque split.

Last edited by andys; 12-24-2006 at 11:42 AM.
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Old 12-22-2009, 01:45 PM   #13
TheHorseFace
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Just didnt want a good post from 2000 go unoticed.
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Old 12-22-2009, 08:27 PM   #14
nikiter
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damn right, let this thread live on
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