AWD system ? Tech
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Lexus Test Driver
Joined: Mar 2013
Posts: 838
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From: Ohio
AWD system ? Tech
Anyone have any information about the 3IS AWD ? I would like to know how many LSD it has, is there any electrical clutch ? Is it Based on RWD ? or FWD. The more specific detail, the better. Thank you
Lexus Champion
Joined: Nov 2013
Posts: 13,274
Likes: 1,889
From: WA
I am not so sure how great this site is, but I came across this explanation, and it seems to mostly jive with what I know about the Lexus AWD system. The article is a couple years old but I believe it's still applicable. Perhaps this helps?
http://www.carthrottle.com/the-carth...luxury-sedans/
The Lexus AWD system is similar in design and function to Nissan’s ATTESA-ETS. The transmission is mounted to the back of the engine, with a driveshaft going to the rear differential. A planetary-gear type limited slip differential is attached to the transmission, with output to it regulated by a multi-plate clutch transfer case. This differential on the rear of the transmission powers a drive shaft which sends power back to the front axle – just like the Nissan, only slightly more complicated. In normal driving, the power split is about 80% rear, but it can send up to 50% to the front axle.
Lead Lap
Joined: Nov 2013
Posts: 4,309
Likes: 1,231
From: IL
Lexus Literature:
Full-Time All-Wheel Drive
This traction-enhancing system distributes power to the front and rear axles during normal driving, and resists sending power to an axle that encounters a low-grip surface.
• A planetary-type center differential and chain drive provide robust, reliable power transfer.
• A wet clutch helps keep an axle from spinning if the front or rear tires encounter slick pavement.
• The clutch engages smoothly and avoids binding when making tight turns.
• Traction control is specially tuned to work in concert with the all-wheel-drive system.
• A robust differential continually delivers power to the front and rear axles.
• The planetary gear design eliminates binding when making sharp turns.
• The wet-clutch limited-slip device helps to keep wheels from spinning on very slippery surfaces.
• Electronic controls help the system respond quickly to changing road and driving conditions
VDIM with Sport Mode:
• One of the high-performance features included on IS 250 and IS 350 F SPORT sedans.
• When VDIM Sport Mode is selected, the VSC and TRAC programming switch to a high-performance mode that raises the threshold at which the systems intervene.
• VDIM Sport Mode allows the driver to accelerate, corner and, in some cases brake more aggressively, without activating VSC.
• VDIM Sport Mode allows the driver to accelerate from a corner or pull away from a dead stop with TRAC operating in A-LSD mode—simulating a limited-slip differential.
• Each time the vehicle is started, VDIM defaults to normal mode
Full-Time All-Wheel Drive
This traction-enhancing system distributes power to the front and rear axles during normal driving, and resists sending power to an axle that encounters a low-grip surface.
• A planetary-type center differential and chain drive provide robust, reliable power transfer.
• A wet clutch helps keep an axle from spinning if the front or rear tires encounter slick pavement.
• The clutch engages smoothly and avoids binding when making tight turns.
• Traction control is specially tuned to work in concert with the all-wheel-drive system.
• A robust differential continually delivers power to the front and rear axles.
• The planetary gear design eliminates binding when making sharp turns.
• The wet-clutch limited-slip device helps to keep wheels from spinning on very slippery surfaces.
• Electronic controls help the system respond quickly to changing road and driving conditions
VDIM with Sport Mode:
• One of the high-performance features included on IS 250 and IS 350 F SPORT sedans.
• When VDIM Sport Mode is selected, the VSC and TRAC programming switch to a high-performance mode that raises the threshold at which the systems intervene.
• VDIM Sport Mode allows the driver to accelerate, corner and, in some cases brake more aggressively, without activating VSC.
• VDIM Sport Mode allows the driver to accelerate from a corner or pull away from a dead stop with TRAC operating in A-LSD mode—simulating a limited-slip differential.
• Each time the vehicle is started, VDIM defaults to normal mode
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