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Re: limited slip differential
"Stephen R. Conrad" <sconrad@telecommunity.to> wrote in message news:2ronnfF1cpl9sU1@uni-berlin.de... > Why doesn't the ABS see the spinning tire and try to slow it down by > applying that tire's brake? That would be "traction control". JoBo > "Jerry Bransford" <jerrypb@cox.net> wrote in message > news:yQ2Yc.159033$sh.115904@fed1read06... > > One thing a limited slip differential does 'not' do is shift power to one > > side or the other. All it does is couple the spinning side to the > > non-spinning side a little via its clutch pack so the resistance of the > tire > > with better traction allows more torque to be sent to both tires. Both > > tires always, always, ALWAYS see exactly 50% of the torque sent to the > rear > > axle by the engine. It's just that when one tire starts spinning on an > open > > differential, the engine only sees the resistance of the spinning tire so > it > > develops very little torque and thus very little torque gets provided to > the > > tire that still has good traction. The more resistance the engine sees, > the > > more torque it develops... so when the LSD couples the spinning tire to > the > > tire that is not spinning, it sees more resistance and thus develops more > > torque... which gives the tire with more traction more power so it gets > you > > going again. This is why stepping on the brakes a little when you're > stuck, > > or pulling the parking brake on a little if it's a rear tire that is > > spinning, will often get you moving again since it provides more > resistance > > for the engine to work into which raises the amount of torque being sent > to > > both tires. > > > > So when one tire is spinning, it's not that the differential is sending > > "all" of the power to the spinning tire... it's really sending a 50:50 > split > > to both sides... but with one tire spinning, the engine sees so little > > resistance that very little torque is developed and when that very little > > torque is split 50:50 to both sides, the side with traction isn't getting > > enough torque to move the vehicle... thus you're stuck. > > > > The fact that both tires always see 50% of the 'available' torque, no > matter > > if it's equipped with a locker, LSD, or just an open axle is the hardest > > thing for most people to understand. It's just how much torque is really > > available to those tires that determine if you're going to be able to move > > or not. :) > > > > Jerry > > -- > > -- > > Jerry Bransford > > PP-ASEL N6TAY > > See the Geezer Jeep at > > http://members.cox.net/jerrypb/ > > "Handywired" <handywired@aol.com> wrote in message > > news:20040828033849.19087.00004249@mb-m06.aol.com... > > > > > >> Pricing out on edmunds my car. What exactly does the > > >> limited > > >>slip differential option do on a jeep, and is it preferable to have it? > > > > > > Yeah, it's a good thing. It shifts some power to the tire with more > > > traction > > > when the rear tires have unequal traction. Otherwise, with an open > > > differential, if you say had one rear tire on an ice patch, and one on > dry > > > pavement, an open differential will literally send all the power to the > > > wheel > > > with NO traction and you'll sit there spinning... > > > > > > However the Jeep Traklock is nothing to get too excited about. It's > > > clutch-based and will wear out. But it'll last 60 or 80K miles and > > > that's > > > probably about when most people who buy new cars sell 'em anyway > (wouldn't > > > know > > > <g>)... > > > > > > -jeff > > > > > > |
Re: limited slip differential
"Stephen R. Conrad" <sconrad@telecommunity.to> wrote in message news:2ronnfF1cpl9sU1@uni-berlin.de... > Why doesn't the ABS see the spinning tire and try to slow it down by > applying that tire's brake? That would be "traction control". JoBo > "Jerry Bransford" <jerrypb@cox.net> wrote in message > news:yQ2Yc.159033$sh.115904@fed1read06... > > One thing a limited slip differential does 'not' do is shift power to one > > side or the other. All it does is couple the spinning side to the > > non-spinning side a little via its clutch pack so the resistance of the > tire > > with better traction allows more torque to be sent to both tires. Both > > tires always, always, ALWAYS see exactly 50% of the torque sent to the > rear > > axle by the engine. It's just that when one tire starts spinning on an > open > > differential, the engine only sees the resistance of the spinning tire so > it > > develops very little torque and thus very little torque gets provided to > the > > tire that still has good traction. The more resistance the engine sees, > the > > more torque it develops... so when the LSD couples the spinning tire to > the > > tire that is not spinning, it sees more resistance and thus develops more > > torque... which gives the tire with more traction more power so it gets > you > > going again. This is why stepping on the brakes a little when you're > stuck, > > or pulling the parking brake on a little if it's a rear tire that is > > spinning, will often get you moving again since it provides more > resistance > > for the engine to work into which raises the amount of torque being sent > to > > both tires. > > > > So when one tire is spinning, it's not that the differential is sending > > "all" of the power to the spinning tire... it's really sending a 50:50 > split > > to both sides... but with one tire spinning, the engine sees so little > > resistance that very little torque is developed and when that very little > > torque is split 50:50 to both sides, the side with traction isn't getting > > enough torque to move the vehicle... thus you're stuck. > > > > The fact that both tires always see 50% of the 'available' torque, no > matter > > if it's equipped with a locker, LSD, or just an open axle is the hardest > > thing for most people to understand. It's just how much torque is really > > available to those tires that determine if you're going to be able to move > > or not. :) > > > > Jerry > > -- > > -- > > Jerry Bransford > > PP-ASEL N6TAY > > See the Geezer Jeep at > > http://members.cox.net/jerrypb/ > > "Handywired" <handywired@aol.com> wrote in message > > news:20040828033849.19087.00004249@mb-m06.aol.com... > > > > > >> Pricing out on edmunds my car. What exactly does the > > >> limited > > >>slip differential option do on a jeep, and is it preferable to have it? > > > > > > Yeah, it's a good thing. It shifts some power to the tire with more > > > traction > > > when the rear tires have unequal traction. Otherwise, with an open > > > differential, if you say had one rear tire on an ice patch, and one on > dry > > > pavement, an open differential will literally send all the power to the > > > wheel > > > with NO traction and you'll sit there spinning... > > > > > > However the Jeep Traklock is nothing to get too excited about. It's > > > clutch-based and will wear out. But it'll last 60 or 80K miles and > > > that's > > > probably about when most people who buy new cars sell 'em anyway > (wouldn't > > > know > > > <g>)... > > > > > > -jeff > > > > > > |
Re: limited slip differential
ABS doesn't apply brakes, it releases them when it senses a wheel has
stopped spinning from a brake that is locked up. There are other systems that sense spinning tires and apply the brake to the offending wheel but they are not ABS systems. Jerry -- Jerry Bransford PP-ASEL N6TAY See the Geezer Jeep at http://members.cox.net/jerrypb/ "Stephen R. Conrad" <sconrad@telecommunity.to> wrote in message news:2ronnfF1cpl9sU1@uni-berlin.de... > Why doesn't the ABS see the spinning tire and try to slow it down by > applying that tire's brake? > > "Jerry Bransford" <jerrypb@cox.net> wrote in message > news:yQ2Yc.159033$sh.115904@fed1read06... >> One thing a limited slip differential does 'not' do is shift power to one >> side or the other. All it does is couple the spinning side to the >> non-spinning side a little via its clutch pack so the resistance of the > tire >> with better traction allows more torque to be sent to both tires. Both >> tires always, always, ALWAYS see exactly 50% of the torque sent to the > rear >> axle by the engine. It's just that when one tire starts spinning on an > open >> differential, the engine only sees the resistance of the spinning tire so > it >> develops very little torque and thus very little torque gets provided to > the >> tire that still has good traction. The more resistance the engine sees, > the >> more torque it develops... so when the LSD couples the spinning tire to > the >> tire that is not spinning, it sees more resistance and thus develops more >> torque... which gives the tire with more traction more power so it gets > you >> going again. This is why stepping on the brakes a little when you're > stuck, >> or pulling the parking brake on a little if it's a rear tire that is >> spinning, will often get you moving again since it provides more > resistance >> for the engine to work into which raises the amount of torque being sent > to >> both tires. >> >> So when one tire is spinning, it's not that the differential is sending >> "all" of the power to the spinning tire... it's really sending a 50:50 > split >> to both sides... but with one tire spinning, the engine sees so little >> resistance that very little torque is developed and when that very little >> torque is split 50:50 to both sides, the side with traction isn't getting >> enough torque to move the vehicle... thus you're stuck. >> >> The fact that both tires always see 50% of the 'available' torque, no > matter >> if it's equipped with a locker, LSD, or just an open axle is the hardest >> thing for most people to understand. It's just how much torque is really >> available to those tires that determine if you're going to be able to >> move >> or not. :) >> >> Jerry >> -- >> -- >> Jerry Bransford >> PP-ASEL N6TAY >> See the Geezer Jeep at >> http://members.cox.net/jerrypb/ >> "Handywired" <handywired@aol.com> wrote in message >> news:20040828033849.19087.00004249@mb-m06.aol.com... >> > >> >> Pricing out on edmunds my car. What exactly does the >> >> limited >> >>slip differential option do on a jeep, and is it preferable to have it? >> > >> > Yeah, it's a good thing. It shifts some power to the tire with more >> > traction >> > when the rear tires have unequal traction. Otherwise, with an open >> > differential, if you say had one rear tire on an ice patch, and one on > dry >> > pavement, an open differential will literally send all the power to the >> > wheel >> > with NO traction and you'll sit there spinning... >> > >> > However the Jeep Traklock is nothing to get too excited about. It's >> > clutch-based and will wear out. But it'll last 60 or 80K miles and >> > that's >> > probably about when most people who buy new cars sell 'em anyway > (wouldn't >> > know >> > <g>)... >> > >> > -jeff >> >> > > |
Re: limited slip differential
ABS doesn't apply brakes, it releases them when it senses a wheel has
stopped spinning from a brake that is locked up. There are other systems that sense spinning tires and apply the brake to the offending wheel but they are not ABS systems. Jerry -- Jerry Bransford PP-ASEL N6TAY See the Geezer Jeep at http://members.cox.net/jerrypb/ "Stephen R. Conrad" <sconrad@telecommunity.to> wrote in message news:2ronnfF1cpl9sU1@uni-berlin.de... > Why doesn't the ABS see the spinning tire and try to slow it down by > applying that tire's brake? > > "Jerry Bransford" <jerrypb@cox.net> wrote in message > news:yQ2Yc.159033$sh.115904@fed1read06... >> One thing a limited slip differential does 'not' do is shift power to one >> side or the other. All it does is couple the spinning side to the >> non-spinning side a little via its clutch pack so the resistance of the > tire >> with better traction allows more torque to be sent to both tires. Both >> tires always, always, ALWAYS see exactly 50% of the torque sent to the > rear >> axle by the engine. It's just that when one tire starts spinning on an > open >> differential, the engine only sees the resistance of the spinning tire so > it >> develops very little torque and thus very little torque gets provided to > the >> tire that still has good traction. The more resistance the engine sees, > the >> more torque it develops... so when the LSD couples the spinning tire to > the >> tire that is not spinning, it sees more resistance and thus develops more >> torque... which gives the tire with more traction more power so it gets > you >> going again. This is why stepping on the brakes a little when you're > stuck, >> or pulling the parking brake on a little if it's a rear tire that is >> spinning, will often get you moving again since it provides more > resistance >> for the engine to work into which raises the amount of torque being sent > to >> both tires. >> >> So when one tire is spinning, it's not that the differential is sending >> "all" of the power to the spinning tire... it's really sending a 50:50 > split >> to both sides... but with one tire spinning, the engine sees so little >> resistance that very little torque is developed and when that very little >> torque is split 50:50 to both sides, the side with traction isn't getting >> enough torque to move the vehicle... thus you're stuck. >> >> The fact that both tires always see 50% of the 'available' torque, no > matter >> if it's equipped with a locker, LSD, or just an open axle is the hardest >> thing for most people to understand. It's just how much torque is really >> available to those tires that determine if you're going to be able to >> move >> or not. :) >> >> Jerry >> -- >> -- >> Jerry Bransford >> PP-ASEL N6TAY >> See the Geezer Jeep at >> http://members.cox.net/jerrypb/ >> "Handywired" <handywired@aol.com> wrote in message >> news:20040828033849.19087.00004249@mb-m06.aol.com... >> > >> >> Pricing out on edmunds my car. What exactly does the >> >> limited >> >>slip differential option do on a jeep, and is it preferable to have it? >> > >> > Yeah, it's a good thing. It shifts some power to the tire with more >> > traction >> > when the rear tires have unequal traction. Otherwise, with an open >> > differential, if you say had one rear tire on an ice patch, and one on > dry >> > pavement, an open differential will literally send all the power to the >> > wheel >> > with NO traction and you'll sit there spinning... >> > >> > However the Jeep Traklock is nothing to get too excited about. It's >> > clutch-based and will wear out. But it'll last 60 or 80K miles and >> > that's >> > probably about when most people who buy new cars sell 'em anyway > (wouldn't >> > know >> > <g>)... >> > >> > -jeff >> >> > > |
Re: limited slip differential
ABS doesn't apply brakes, it releases them when it senses a wheel has
stopped spinning from a brake that is locked up. There are other systems that sense spinning tires and apply the brake to the offending wheel but they are not ABS systems. Jerry -- Jerry Bransford PP-ASEL N6TAY See the Geezer Jeep at http://members.cox.net/jerrypb/ "Stephen R. Conrad" <sconrad@telecommunity.to> wrote in message news:2ronnfF1cpl9sU1@uni-berlin.de... > Why doesn't the ABS see the spinning tire and try to slow it down by > applying that tire's brake? > > "Jerry Bransford" <jerrypb@cox.net> wrote in message > news:yQ2Yc.159033$sh.115904@fed1read06... >> One thing a limited slip differential does 'not' do is shift power to one >> side or the other. All it does is couple the spinning side to the >> non-spinning side a little via its clutch pack so the resistance of the > tire >> with better traction allows more torque to be sent to both tires. Both >> tires always, always, ALWAYS see exactly 50% of the torque sent to the > rear >> axle by the engine. It's just that when one tire starts spinning on an > open >> differential, the engine only sees the resistance of the spinning tire so > it >> develops very little torque and thus very little torque gets provided to > the >> tire that still has good traction. The more resistance the engine sees, > the >> more torque it develops... so when the LSD couples the spinning tire to > the >> tire that is not spinning, it sees more resistance and thus develops more >> torque... which gives the tire with more traction more power so it gets > you >> going again. This is why stepping on the brakes a little when you're > stuck, >> or pulling the parking brake on a little if it's a rear tire that is >> spinning, will often get you moving again since it provides more > resistance >> for the engine to work into which raises the amount of torque being sent > to >> both tires. >> >> So when one tire is spinning, it's not that the differential is sending >> "all" of the power to the spinning tire... it's really sending a 50:50 > split >> to both sides... but with one tire spinning, the engine sees so little >> resistance that very little torque is developed and when that very little >> torque is split 50:50 to both sides, the side with traction isn't getting >> enough torque to move the vehicle... thus you're stuck. >> >> The fact that both tires always see 50% of the 'available' torque, no > matter >> if it's equipped with a locker, LSD, or just an open axle is the hardest >> thing for most people to understand. It's just how much torque is really >> available to those tires that determine if you're going to be able to >> move >> or not. :) >> >> Jerry >> -- >> -- >> Jerry Bransford >> PP-ASEL N6TAY >> See the Geezer Jeep at >> http://members.cox.net/jerrypb/ >> "Handywired" <handywired@aol.com> wrote in message >> news:20040828033849.19087.00004249@mb-m06.aol.com... >> > >> >> Pricing out on edmunds my car. What exactly does the >> >> limited >> >>slip differential option do on a jeep, and is it preferable to have it? >> > >> > Yeah, it's a good thing. It shifts some power to the tire with more >> > traction >> > when the rear tires have unequal traction. Otherwise, with an open >> > differential, if you say had one rear tire on an ice patch, and one on > dry >> > pavement, an open differential will literally send all the power to the >> > wheel >> > with NO traction and you'll sit there spinning... >> > >> > However the Jeep Traklock is nothing to get too excited about. It's >> > clutch-based and will wear out. But it'll last 60 or 80K miles and >> > that's >> > probably about when most people who buy new cars sell 'em anyway > (wouldn't >> > know >> > <g>)... >> > >> > -jeff >> >> > > |
Re: limited slip differential
You're thinking of the Traction Control System, found on most rear
wheel drive Fords: http://www.conti-online.com/generato...system_en.html God Bless America, ßill O|||||||O mailto:-------------------- http://www.----------.com/ "Stephen R. Conrad" wrote: > > Why doesn't the ABS see the spinning tire and try to slow it down by > applying that tire's brake? |
Re: limited slip differential
You're thinking of the Traction Control System, found on most rear
wheel drive Fords: http://www.conti-online.com/generato...system_en.html God Bless America, ßill O|||||||O mailto:-------------------- http://www.----------.com/ "Stephen R. Conrad" wrote: > > Why doesn't the ABS see the spinning tire and try to slow it down by > applying that tire's brake? |
Re: limited slip differential
You're thinking of the Traction Control System, found on most rear
wheel drive Fords: http://www.conti-online.com/generato...system_en.html God Bless America, ßill O|||||||O mailto:-------------------- http://www.----------.com/ "Stephen R. Conrad" wrote: > > Why doesn't the ABS see the spinning tire and try to slow it down by > applying that tire's brake? |
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