M's AWD system...
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Moderator Alumnus
Joined: Dec 2003
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From: NYC/SF/Tokyo/HK
M's AWD system...
I was checking on Infiniti's M35 AWD model last night,
Standing Start:
M: 25% on each front wheel, 25% on each rear wheel (50/50); then, it could send up to 50% to each rear wheel (0/100).
Running:
M: Up to 25% of power could send to each front wheel if necessary.
Snow Mode:
M: After pressing Snow Switch, 25% power to each wheel in most of time.
So, how does RL distribute its power to wheels in these situations? 30/70 (front/rear)?... Thanks.
Standing Start:
M: 25% on each front wheel, 25% on each rear wheel (50/50); then, it could send up to 50% to each rear wheel (0/100).
Running:
M: Up to 25% of power could send to each front wheel if necessary.
Snow Mode:
M: After pressing Snow Switch, 25% power to each wheel in most of time.
So, how does RL distribute its power to wheels in these situations? 30/70 (front/rear)?... Thanks.
Standing start:
RL: 70% front, 30% rear unless slippage is detected. Capable of transferring up to 70% to rear.
Running:
RL: same as above, unless in maneuvers where additional power is required to rotate the car.
Snow:
RL: same as first unless slippage is detected. RL being front heavy utilizes FWD bias to provide best traction.
RL: 70% front, 30% rear unless slippage is detected. Capable of transferring up to 70% to rear.
Running:
RL: same as above, unless in maneuvers where additional power is required to rotate the car.
Snow:
RL: same as first unless slippage is detected. RL being front heavy utilizes FWD bias to provide best traction.
Thread Starter
Moderator Alumnus
Joined: Dec 2003
Posts: 12,177
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From: NYC/SF/Tokyo/HK
So, how's about Audi Quattro, BMW X, MB 4MATIC, and Lexus 06GS300 AWD?
I heard BMW is 38% front/62% rear fixed, and MB is 40%/60% fixed, are they right? Thanks.
Thank You. CGTSX2004
I heard BMW is 38% front/62% rear fixed, and MB is 40%/60% fixed, are they right? Thanks.
Thank You. CGTSX2004
Originally Posted by CGTSX2004
Let's compare...
SH-AWD : FWD bias during regular driving. 70/30 front rear power split. Capable of 30/70 split under certain conditions and capable of actively sending all of the power in the rear to either wheel during hard cornering.
Quattro: FWD bias during regular driving, rear differential is not always engaged. When the front wheels begin to lose traction, powerful is diverted from the the front to the rear via a Haldex differential. 4MOTION on the VWs is the same thing. Maximum of 50% power transfer to the rear.
4Matic: All-time AWD system with 50/50 (I think this is right?) split. Capable of transferring power forward or backward depending on traction with up to a maximum of between 60-70% at either axle at any time.
X-Drive: RWD biased with 35/65 power distribution. Capable of transferring power forward when rear loses traction. Maximum of 50/50 split.
ATTESSA-ETS: RWD bias (or fwd depending on application, but let's assume the G35x for now). 100% power to rear except when traction lost. Maximum of 50/50 split. Capable of actively transferring power between front and rear axles.
So essentially, the SH-AWD takes the ATTESSA-ETS system one step farther by using an active rear differential. Many of the AWD systems simply split power between front and rear with an open differential between the left and right wheels. SH-AWD uses an open differential up front, but an active differential in the rear with an active differential connected to the transmission to allow the power to be routed depending on the computer's sensor inputs.
SH-AWD : FWD bias during regular driving. 70/30 front rear power split. Capable of 30/70 split under certain conditions and capable of actively sending all of the power in the rear to either wheel during hard cornering.
Quattro: FWD bias during regular driving, rear differential is not always engaged. When the front wheels begin to lose traction, powerful is diverted from the the front to the rear via a Haldex differential. 4MOTION on the VWs is the same thing. Maximum of 50% power transfer to the rear.
4Matic: All-time AWD system with 50/50 (I think this is right?) split. Capable of transferring power forward or backward depending on traction with up to a maximum of between 60-70% at either axle at any time.
X-Drive: RWD biased with 35/65 power distribution. Capable of transferring power forward when rear loses traction. Maximum of 50/50 split.
ATTESSA-ETS: RWD bias (or fwd depending on application, but let's assume the G35x for now). 100% power to rear except when traction lost. Maximum of 50/50 split. Capable of actively transferring power between front and rear axles.
So essentially, the SH-AWD takes the ATTESSA-ETS system one step farther by using an active rear differential. Many of the AWD systems simply split power between front and rear with an open differential between the left and right wheels. SH-AWD uses an open differential up front, but an active differential in the rear with an active differential connected to the transmission to allow the power to be routed depending on the computer's sensor inputs.
Retired MOD
Joined: Mar 2001
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From: Fredericksburg, VA
Originally Posted by CGTSX2004
Standing start:
RL: 70% front, 30% rear unless slippage is detected. Capable of transferring up to 70% to rear.
Running:
RL: same as above, unless in maneuvers where additional power is required to rotate the car.
Snow:
RL: same as first unless slippage is detected. RL being front heavy utilizes FWD bias to provide best traction.
RL: 70% front, 30% rear unless slippage is detected. Capable of transferring up to 70% to rear.
Running:
RL: same as above, unless in maneuvers where additional power is required to rotate the car.
Snow:
RL: same as first unless slippage is detected. RL being front heavy utilizes FWD bias to provide best traction.
The RL does not required slippage to change power ratio nor a buttom.
The RL uses almost everything before slippage to reroute power to the wheels. for example:
The RL will us 70% of the power from standing start if WOT not because of slippage. The RL will route power on many factors like steering angle, yaw rate, latteral G, acceleration, speed, etc, before it does because of slippage like conventional AWD systems.
In the other hand you have MB 4matic wich is NOT fixed but acutally the most flexible AWD system I know of. It will use slippage, but it could take or give up to 100% to each individual wheel, so for snow and traction it will be the best.
Retired MOD
Joined: Mar 2001
Posts: 3,995
Likes: 1
From: Fredericksburg, VA
Originally Posted by CGTSX2004
Standing start:
RL: 70% front, 30% rear unless slippage is detected. Capable of transferring up to 70% to rear.
Running:
RL: same as above, unless in maneuvers where additional power is required to rotate the car.
Snow:
RL: same as first unless slippage is detected. RL being front heavy utilizes FWD bias to provide best traction.
RL: 70% front, 30% rear unless slippage is detected. Capable of transferring up to 70% to rear.
Running:
RL: same as above, unless in maneuvers where additional power is required to rotate the car.
Snow:
RL: same as first unless slippage is detected. RL being front heavy utilizes FWD bias to provide best traction.
The RL does not required slippage to change power ratio nor a buttom.
The RL uses almost everything before slippage to reroute power to the wheels. for example:
The RL will send 70% of the power to the rear from standing start if WOT not because of slippage. The RL will route power on many factors like steering angle, yaw rate, latteral G, acceleration, speed, etc, before it does because of slippage like conventional AWD systems.
In my opinion the RL is no FWD bias, but puts the power where is more needed according to the situation. In most situations the power is more efficient in the front, that is why the RL is on a 70/30 split most of the time, but it is the right place, so I wouldn't say bias just in the right place.
In the other hand you have MB 4matic wich is NOT fixed but acutally the most flexible AWD system I know of. It will use slippage, but it could take or give up to 100% to each individual wheel, so for snow and traction it will be the best.
Thread Starter
Moderator Alumnus
Joined: Dec 2003
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From: NYC/SF/Tokyo/HK
Originally Posted by AcuraRLBlue
I thought that the RL is programmed to have more of the power going to the rear wheels during initial acceleration from a stop, but I noticed on the meter that the power was at the front wheels. Has anyone noticed this?
This thread indicates that RL shifts some power to the front for the start....
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Retired MOD
Joined: Mar 2001
Posts: 3,995
Likes: 1
From: Fredericksburg, VA
Originally Posted by rets
This thread indicates that RL shifts some power to the front for the start....
Own an RL
Stright empty road
Have MID display SH-AWD
From standing start go WOT (wide open throttle) full accel.
Look at your MID and see where the power is going.
I'm almost sure more power goes to the rear, but I'm not 100%
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