i have a 1994 legacy turbo.. i read from magazines that US legacy
turbo have center and rear LSD... but i also read one article that
says it has a front LSD....
anyways.. i was wonder how i could tell my LSDs are working properly
becoz in first gear in wet.. my car still want to understeer more
than
oversteer.. does that mean my LSD might have some problem?
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Question about LSDs on US legacy turbo
Moderators: Helpinators, Moderators
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Josh Colombo
Question about LSDs on US legacy turbo
That really doesn't have anything to do with the LSD
Depending on transmission.... With the manual transmissions it uses a center viscous clutch system to distribute power to front and rear, it's a 50/50 split....when one plate ie front or rear spins slower or faster then the other reacts to compensate for the slip....so if the rear is spinning the front wants to catch up spinning at the same speed, and will get more of the power....so in essance it is limited slip...but not really....don't know if that makes sense...if not, lemme know..and I can try again or if someone else can chime in.
As for the automatic transmission the front and rear torque split is electronically controlled...as to how...I'm not positive...it's electronics
As for the LSD, it basically does something similar....but I believe it locks up...so both will spin together...sorta like a solid axle...I don't think it really transmits power from left to right though.
If anyone else has any more technical answers, feel free to correct me.
Josh
-----Original Message-----
From: prostho@netscape.net [ mailto:prostho@netscape.net]
Sent: Sunday, January 21, 2001 12:50 AM
To: BC-BFLegacyWorks@egroups.com
Subject: [BC-BFLegacyWorks] Question about LSDs on US legacy turbo
i have a 1994 legacy turbo.. i read from magazines that US legacy
turbo have center and rear LSD... but i also read one article that
says it has a front LSD....
anyways.. i was wonder how i could tell my LSDs are working properly
becoz in first gear in wet.. my car still want to understeer more
than
oversteer.. does that mean my LSD might have some problem?
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Depending on transmission.... With the manual transmissions it uses a center viscous clutch system to distribute power to front and rear, it's a 50/50 split....when one plate ie front or rear spins slower or faster then the other reacts to compensate for the slip....so if the rear is spinning the front wants to catch up spinning at the same speed, and will get more of the power....so in essance it is limited slip...but not really....don't know if that makes sense...if not, lemme know..and I can try again or if someone else can chime in.
As for the automatic transmission the front and rear torque split is electronically controlled...as to how...I'm not positive...it's electronics
As for the LSD, it basically does something similar....but I believe it locks up...so both will spin together...sorta like a solid axle...I don't think it really transmits power from left to right though.
If anyone else has any more technical answers, feel free to correct me.
Josh
-----Original Message-----
From: prostho@netscape.net [ mailto:prostho@netscape.net]
Sent: Sunday, January 21, 2001 12:50 AM
To: BC-BFLegacyWorks@egroups.com
Subject: [BC-BFLegacyWorks] Question about LSDs on US legacy turbo
i have a 1994 legacy turbo.. i read from magazines that US legacy
turbo have center and rear LSD... but i also read one article that
says it has a front LSD....
anyways.. i was wonder how i could tell my LSDs are working properly
becoz in first gear in wet.. my car still want to understeer more
than
oversteer.. does that mean my LSD might have some problem?
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prostho@netscape.net
Question about LSDs on US legacy turbo
by the way.. is part # 27011AA151 LSD? thats what the tag on my diff
says in the rear.. and gear ratio 3.900.
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says in the rear.. and gear ratio 3.900.
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prostho@netscape.net
Question about LSDs on US legacy turbo
from what i heard.. subaru cars have a open center diff with a viscous
lock.. viscous differential will only result in part time awd while
subaru has full time AWD...
corrections anyone??
anyways.. i am more interested in rear LSD becoz i don't know if its a
LSD or not... but i am pretty sure all subarus more moderm subaru with
full time AWD has the viscous lock center diff system
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lock.. viscous differential will only result in part time awd while
subaru has full time AWD...
corrections anyone??
anyways.. i am more interested in rear LSD becoz i don't know if its a
LSD or not... but i am pretty sure all subarus more moderm subaru with
full time AWD has the viscous lock center diff system
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Rod
Question about LSDs on US legacy turbo
Rear differential........on RS Turbo (not std Liberty, they do not have VC in rear diff.. only centre VC)
1. when right and left wheels turn at equal speed: during normal straight road driving where the right and left wheels run at equal speed , the differential case and side gears rotate together, just as in conventional differentials. As a result, driving torque is transmitted equally to the right and left side gears.
2. when right and left wheels turn at different speeds: when a speed difference occurs between the right and left wheels, the viscous coupling, (VC), housing and the VC hub turn relatively at the same speed difference as that of the rear drive shaft. Because of the shearing forces caused in the silicon oil, a differential torque is generated, which controls differential operation. eg, if the left wheel turns idle due to a difference in the road resistance, a speed difference ocuurs between the right and left wheel. Since the VC is installed between the right and left wheels differential torque is transferred from right to left (left to right). Accordingly, a greater driving force is transferred to the other wheel which is rotating at a lower speed.
This is in conjuntion with the centre VC Differential found in the manual gearbox. Works in the same manner but transfers engine torque from front to rear.
There is no VC in the front differential. Although i do think the is one on the STI 22B WRX.
Over steering is just an inherent problem of the way subaru have set up the suspension. Fitting a larger rear sway bar will help this ..heaps. Generally a all-wheel drive car will handle similar to a front wheel drive car ..understeer.
Regards, Rod
----- Original Message -----
From: Josh Colombo <mailto:jcc189@psu.edu>
To: BC-BFLegacyWorks@egroups.com
Sent: Sunday, January 21, 2001 5:16 PM
Subject: RE: [BC-BFLegacyWorks] Question about LSDs on US legacy turbo
That really doesn't have anything to do with the LSD
Depending on transmission.... With the manual transmissions it uses a center viscous clutch system to distribute power to front and rear, it's a 50/50 split....when one plate ie front or rear spins slower or faster then the other reacts to compensate for the slip....so if the rear is spinning the front wants to catch up spinning at the same speed, and will get more of the power....so in essance it is limited slip...but not really....don't know if that makes sense...if not, lemme know..and I can try again or if someone else can chime in.
As for the automatic transmission the front and rear torque split is electronically controlled...as to how...I'm not positive...it's electronics
As for the LSD, it basically does something similar....but I believe it locks up...so both will spin together...sorta like a solid axle...I don't think it really transmits power from left to right though.
If anyone else has any more technical answers, feel free to correct me.
Josh
-----Original Message-----
From: prostho@netscape.net [ mailto:prostho@netscape.net]
Sent: Sunday, January 21, 2001 12:50 AM
To: BC-BFLegacyWorks@egroups.com
Subject: [BC-BFLegacyWorks] Question about LSDs on US legacy turbo
i have a 1994 legacy turbo.. i read from magazines that US legacy
turbo have center and rear LSD... but i also read one article that
says it has a front LSD....
anyways.. i was wonder how i could tell my LSDs are working properly
becoz in first gear in wet.. my car still want to understeer more
than
oversteer.. does that mean my LSD might have some problem?
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BC-BFLegacyWorks-unsubscribe@egroups.com
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1. when right and left wheels turn at equal speed: during normal straight road driving where the right and left wheels run at equal speed , the differential case and side gears rotate together, just as in conventional differentials. As a result, driving torque is transmitted equally to the right and left side gears.
2. when right and left wheels turn at different speeds: when a speed difference occurs between the right and left wheels, the viscous coupling, (VC), housing and the VC hub turn relatively at the same speed difference as that of the rear drive shaft. Because of the shearing forces caused in the silicon oil, a differential torque is generated, which controls differential operation. eg, if the left wheel turns idle due to a difference in the road resistance, a speed difference ocuurs between the right and left wheel. Since the VC is installed between the right and left wheels differential torque is transferred from right to left (left to right). Accordingly, a greater driving force is transferred to the other wheel which is rotating at a lower speed.
This is in conjuntion with the centre VC Differential found in the manual gearbox. Works in the same manner but transfers engine torque from front to rear.
There is no VC in the front differential. Although i do think the is one on the STI 22B WRX.
Over steering is just an inherent problem of the way subaru have set up the suspension. Fitting a larger rear sway bar will help this ..heaps. Generally a all-wheel drive car will handle similar to a front wheel drive car ..understeer.
Regards, Rod
----- Original Message -----
From: Josh Colombo <mailto:jcc189@psu.edu>
To: BC-BFLegacyWorks@egroups.com
Sent: Sunday, January 21, 2001 5:16 PM
Subject: RE: [BC-BFLegacyWorks] Question about LSDs on US legacy turbo
That really doesn't have anything to do with the LSD
Depending on transmission.... With the manual transmissions it uses a center viscous clutch system to distribute power to front and rear, it's a 50/50 split....when one plate ie front or rear spins slower or faster then the other reacts to compensate for the slip....so if the rear is spinning the front wants to catch up spinning at the same speed, and will get more of the power....so in essance it is limited slip...but not really....don't know if that makes sense...if not, lemme know..and I can try again or if someone else can chime in.
As for the automatic transmission the front and rear torque split is electronically controlled...as to how...I'm not positive...it's electronics
As for the LSD, it basically does something similar....but I believe it locks up...so both will spin together...sorta like a solid axle...I don't think it really transmits power from left to right though.
If anyone else has any more technical answers, feel free to correct me.
Josh
-----Original Message-----
From: prostho@netscape.net [ mailto:prostho@netscape.net]
Sent: Sunday, January 21, 2001 12:50 AM
To: BC-BFLegacyWorks@egroups.com
Subject: [BC-BFLegacyWorks] Question about LSDs on US legacy turbo
i have a 1994 legacy turbo.. i read from magazines that US legacy
turbo have center and rear LSD... but i also read one article that
says it has a front LSD....
anyways.. i was wonder how i could tell my LSDs are working properly
becoz in first gear in wet.. my car still want to understeer more
than
oversteer.. does that mean my LSD might have some problem?
To unsubscribe from this group, send an email to:
BC-BFLegacyWorks-unsubscribe@egroups.com
To unsubscribe from this group, send an email to:
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Kevin & Alyse
Question about LSDs on US legacy turbo
Here is the skinny on the diffs......I am a driving instructor at a four
wheel driving facility.......
Anyway, a viscous coupling or VC is basically a clutch between your front
and rear drive axles. When all four wheels are spinning at the same speed,
power is transmitted equally (50% front and 50% rear). When you turn a
corner, even if you have good traction, your wheels (all 4) turn at
different speeds. In this situation, the VC will not activate because it is
designed to accomodate a certain amout of "slop" in the system (you would
go through tires very quickly if it were not this way.)
To preface the next part, let it be understood that differentials are lazy
and send power to the wheel or axle with the least amount of traction,
whether it be the front center or rear diff.
When you start to lose traction at the ie front of the car, the front drive
shaft turns faster than the rear and creates friction inside the VC. The
friction then heats up the fluid inside the VC, and forces clutch plates
together to essentially lock the front and rear driveshafts together.
Because the system relies on friction and heat, this lock will unlock as the
fluid then cools. However, keep in mind that this all happens within a
fraction of a second so the user may not even notice. Because of this, the
VC can lock and unlock many times within a very small time frame until good
traction is restored.
As far as I know, there is no LSD on the front of our cars. There is one on
the rear. It works similar to the vc, but does not lock. Instead, there is
a certain amount of slop, meaning difference in wheel speeds built into the
lsd, thus "limited slip". Once the maximum slip is acheived, a percentage
of the power that is being sent to that axle (be it front or rear) will go
to the slower spinning wheel, however no equalization is acheived.
Basically if you have a right wheel spinning, the left will still spin at a
percentage of the right until good traction is restored.
I think all my ducks are in a row, but if anyone can find some fault in this
please let me know.
By the way, the VC is TUNABLE by using different weight fluids. It can as
you may have guessed, be set up more agressively (more traction and tire
wear) or lazier!
KMH
----- Original Message -----
From: <prostho@netscape.net>
To: <BC-BFLegacyWorks@egroups.com>
Sent: Sunday, January 21, 2001 1:34 AM
Subject: [BC-BFLegacyWorks] Re: Question about LSDs on US legacy turbo
> from what i heard.. subaru cars have a open center diff with a viscous
> lock.. viscous differential will only result in part time awd while
> subaru has full time AWD...
>
> corrections anyone??
>
> anyways.. i am more interested in rear LSD becoz i don't know if its a
> LSD or not... but i am pretty sure all subarus more moderm subaru with
> full time AWD has the viscous lock center diff system
>
>
> To unsubscribe from this group, send an email to:
> BC-BFLegacyWorks-unsubscribe@egroups.com
>
>
To unsubscribe from this group, send an email to:
BC-BFLegacyWorks-unsubscribe@egroups.com
wheel driving facility.......
Anyway, a viscous coupling or VC is basically a clutch between your front
and rear drive axles. When all four wheels are spinning at the same speed,
power is transmitted equally (50% front and 50% rear). When you turn a
corner, even if you have good traction, your wheels (all 4) turn at
different speeds. In this situation, the VC will not activate because it is
designed to accomodate a certain amout of "slop" in the system (you would
go through tires very quickly if it were not this way.)
To preface the next part, let it be understood that differentials are lazy
and send power to the wheel or axle with the least amount of traction,
whether it be the front center or rear diff.
When you start to lose traction at the ie front of the car, the front drive
shaft turns faster than the rear and creates friction inside the VC. The
friction then heats up the fluid inside the VC, and forces clutch plates
together to essentially lock the front and rear driveshafts together.
Because the system relies on friction and heat, this lock will unlock as the
fluid then cools. However, keep in mind that this all happens within a
fraction of a second so the user may not even notice. Because of this, the
VC can lock and unlock many times within a very small time frame until good
traction is restored.
As far as I know, there is no LSD on the front of our cars. There is one on
the rear. It works similar to the vc, but does not lock. Instead, there is
a certain amount of slop, meaning difference in wheel speeds built into the
lsd, thus "limited slip". Once the maximum slip is acheived, a percentage
of the power that is being sent to that axle (be it front or rear) will go
to the slower spinning wheel, however no equalization is acheived.
Basically if you have a right wheel spinning, the left will still spin at a
percentage of the right until good traction is restored.
I think all my ducks are in a row, but if anyone can find some fault in this
please let me know.
By the way, the VC is TUNABLE by using different weight fluids. It can as
you may have guessed, be set up more agressively (more traction and tire
wear) or lazier!
KMH
----- Original Message -----
From: <prostho@netscape.net>
To: <BC-BFLegacyWorks@egroups.com>
Sent: Sunday, January 21, 2001 1:34 AM
Subject: [BC-BFLegacyWorks] Re: Question about LSDs on US legacy turbo
> from what i heard.. subaru cars have a open center diff with a viscous
> lock.. viscous differential will only result in part time awd while
> subaru has full time AWD...
>
> corrections anyone??
>
> anyways.. i am more interested in rear LSD becoz i don't know if its a
> LSD or not... but i am pretty sure all subarus more moderm subaru with
> full time AWD has the viscous lock center diff system
>
>
> To unsubscribe from this group, send an email to:
> BC-BFLegacyWorks-unsubscribe@egroups.com
>
>
To unsubscribe from this group, send an email to:
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