As first implemented in the Acura RL, SH-AWD allows torque to be continuously distributed between front and rear wheels from 70% front/30% rear to 30% front/70% rear, with up to 100% of the rear power being distributed to the outer left or right wheel to assist in cornering and dramatically reducing understeer. For example, in straight line full throttle acceleration, the RL is capable of distributing 40% of torque to the rear wheels and 60% to the front wheels. In a hard turn, of percentage of power distributed to the rear wheels, up to 100% of the rear wheel power can be distributed to the single, outer rear wheel. This action will push the rear around the corner, and helping with steering, reducing understeer and keeping the car balanced and controlled. The effect can be likened to steering in a row boat where applying more power to one oar can turn the boat.
ACURA The RDX takes over from
2011 Acura RDX Turbo Engine
The SH-AWD all-wheel drive system was lauded by Popular Science as one of the best automotive innovations of 2004, and as part of an already tech filled vehicle helped to earn the 2005 "Tech car of the year" from CNET.com. All wheel drive systems for passenger cars, although common place today, have existed in the luxury car segment for quite some time. Audi's all wheel drive system quattro was introduced in 1980 on the Audi Quattro. Audi's parent company Volkswagen Group has been developing four-wheel drive systems almost since its inception during the Second World War.
Acura RDX Turbo SH-AWD
On a very gross level, the SH-AWD system is combination of the Honda VTM-4 automatic all wheel drive system and the ATTS variable torque distribution system. Honda introduced the Active Torque Transfer System (ATTS) technology in the 1997 Honda Prelude Type SH . Honda introduced the Variable Torque Management 4WD (VTM-4) automatic all wheel drive system in late 2000 on the 2001 model year Acura MDX sport utility vehicle (SUV) and later on the 2002 Honda Pilot SUV.
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acura rdx
The ATTS equipped front-wheel drive Honda Prelude was labeled Type SH - for "Super Handling". The ATTS was able to distribute torque across the front drive wheels in order to reduce understeer in cornering, and provide more neutral handling for the front-wheel driven car. The ATTS garnered high praise for the 5th and last generation of the Honda Prelude, and earned the Type SH Prelude the best handling car under $30,000 award from Car and Driver magazine. However, the real usefulness of this high technology differential, which came at a more than $2000 premium, was debatable in a car that was already well-known for its handling prowess. The ATTS was only available in the highest trim level, manual transmission form, or about 5% of the Preludes offered for sale.
Acura RDX.
2.3-liter i-VTEC Turbocharged
The VTM-4 system claimed to be different from other all wheel drive systems in that it "anticipated" wheel slippage, rather than waiting for the vehicle to sense wheel slippage, after the vehicle may already be in trouble. The VTM-4 system consisted of a pair of computer controlled wet clutches in the rear axle that worked in concert with the front wheels regardless of road conditions. On start-up, the VTM-4 system would send torque (power) from the front wheels to the rear wheels to supplement the normal front wheel drive mode. With all four wheels being powered on start-up, regardless of conditions, more tire adhesion is provided from four driving wheels rather than two front driving wheels. In the dry, this served to reduce front wheel drive torque steer, and provide more front tire adhesion for cornering. In the wet, snow or mud, power to the rear wheels moves the vehicle from rest with a minimum of wheelspin because all four tires are working together to move the car, rather than just two front tires. If conditions are really slippery and wheel spin is unavoidable, VTM-4 instantly reacts by adding rear-wheel torque in proportion to both the slippage and the rate of increase of slippage. VTM-4 was also designed with a special lock mode to help extract the vehicle from a stuck condition, such as a snow bank. This lock mode automatically engaged power to all four wheels at low speeds. As speeds increased, the power to the rear wheel would decrease, and by 18 mph, the system would revert to front wheel drive.
2011 Acura RDX | Photos
2007 Acura RDX Turbo SH-AWD
Acura Rdx Turbo
SH-AWD combined both the automatic all wheel drive VTM-4 system capability with the "super handling" torque shifting ability of ATTS on the rear axles.
Acura RDX Engine View
2010 Acura RDX Turbo Pictures
In the North American market, Honda introduced the original SH-AWD system introduced in late 2004 with the second generation 2005 Acura RL. Two other SH-AWD variants were introduced in late 2006 in the then all new 2007 Acura RDX and the new second generation 2007 Acura MDX Sport Utility Vehicles SUV. In late 2008, an improved version of the Acura RL SH-AWD was introduced in the significantly revised Mid-Model Change (MMC) of the 2009 Acura RL. This improved version provided earlier SH-AWD intervention (first gear vs second) and more precise use of the rear differential electromagnetic clutch system to provide an improved limited-slip differential function.
Acura RDX
2011 Acura RDX Turbo 4
Acura Rdx Turbo. 2011 Acura
2010 Acura RDX
2011 Acura RDX Profile
ACURA The RDX takes over from
2011 Acura RDX Turbo Engine
The SH-AWD all-wheel drive system was lauded by Popular Science as one of the best automotive innovations of 2004, and as part of an already tech filled vehicle helped to earn the 2005 "Tech car of the year" from CNET.com. All wheel drive systems for passenger cars, although common place today, have existed in the luxury car segment for quite some time. Audi's all wheel drive system quattro was introduced in 1980 on the Audi Quattro. Audi's parent company Volkswagen Group has been developing four-wheel drive systems almost since its inception during the Second World War.
Acura RDX Turbo SH-AWD
On a very gross level, the SH-AWD system is combination of the Honda VTM-4 automatic all wheel drive system and the ATTS variable torque distribution system. Honda introduced the Active Torque Transfer System (ATTS) technology in the 1997 Honda Prelude Type SH . Honda introduced the Variable Torque Management 4WD (VTM-4) automatic all wheel drive system in late 2000 on the 2001 model year Acura MDX sport utility vehicle (SUV) and later on the 2002 Honda Pilot SUV.
acura rdx
The ATTS equipped front-wheel drive Honda Prelude was labeled Type SH - for "Super Handling". The ATTS was able to distribute torque across the front drive wheels in order to reduce understeer in cornering, and provide more neutral handling for the front-wheel driven car. The ATTS garnered high praise for the 5th and last generation of the Honda Prelude, and earned the Type SH Prelude the best handling car under $30,000 award from Car and Driver magazine. However, the real usefulness of this high technology differential, which came at a more than $2000 premium, was debatable in a car that was already well-known for its handling prowess. The ATTS was only available in the highest trim level, manual transmission form, or about 5% of the Preludes offered for sale.
Acura RDX.
2.3-liter i-VTEC Turbocharged
The VTM-4 system claimed to be different from other all wheel drive systems in that it "anticipated" wheel slippage, rather than waiting for the vehicle to sense wheel slippage, after the vehicle may already be in trouble. The VTM-4 system consisted of a pair of computer controlled wet clutches in the rear axle that worked in concert with the front wheels regardless of road conditions. On start-up, the VTM-4 system would send torque (power) from the front wheels to the rear wheels to supplement the normal front wheel drive mode. With all four wheels being powered on start-up, regardless of conditions, more tire adhesion is provided from four driving wheels rather than two front driving wheels. In the dry, this served to reduce front wheel drive torque steer, and provide more front tire adhesion for cornering. In the wet, snow or mud, power to the rear wheels moves the vehicle from rest with a minimum of wheelspin because all four tires are working together to move the car, rather than just two front tires. If conditions are really slippery and wheel spin is unavoidable, VTM-4 instantly reacts by adding rear-wheel torque in proportion to both the slippage and the rate of increase of slippage. VTM-4 was also designed with a special lock mode to help extract the vehicle from a stuck condition, such as a snow bank. This lock mode automatically engaged power to all four wheels at low speeds. As speeds increased, the power to the rear wheel would decrease, and by 18 mph, the system would revert to front wheel drive.
2011 Acura RDX | Photos
2007 Acura RDX Turbo SH-AWD
Acura Rdx Turbo
SH-AWD combined both the automatic all wheel drive VTM-4 system capability with the "super handling" torque shifting ability of ATTS on the rear axles.
Acura RDX Engine View
2010 Acura RDX Turbo Pictures
In the North American market, Honda introduced the original SH-AWD system introduced in late 2004 with the second generation 2005 Acura RL. Two other SH-AWD variants were introduced in late 2006 in the then all new 2007 Acura RDX and the new second generation 2007 Acura MDX Sport Utility Vehicles SUV. In late 2008, an improved version of the Acura RL SH-AWD was introduced in the significantly revised Mid-Model Change (MMC) of the 2009 Acura RL. This improved version provided earlier SH-AWD intervention (first gear vs second) and more precise use of the rear differential electromagnetic clutch system to provide an improved limited-slip differential function.
Acura RDX
2011 Acura RDX Turbo 4
Acura Rdx Turbo. 2011 Acura
2010 Acura RDX
2011 Acura RDX Profile
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