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<blockquote data-quote="AlucarD" data-source="post: 1063920565" data-attributes="member: 1703"><p>There is a common misconception that by replacing the rear LSD the AYC will be disable. The AYC is a hydraulic operated system and only way to disable it is to take out the pump or prevent the pump from operating. Normal street car can have both AYC and LSD running at the rear. A good example is the Cusco LSD for the rear that is designed to work with the AYC. To take out the AYC entirely you need to take out the plumbing and fit a non AYC LSD the likes or Kaaz or wavetrack. Also you need to modify the rear housing to enable proper lubrication holes for the normal gear oil to flow into the AYC side. The is normally for race application or if you have RS rear diff that does not come with AYC but a mechanical OEM LSD. If you have problem with the system the 3 lights on your dash with be light up permanently. </p><p></p><p>The 3 lights in your dash is also for the ACD. The ACD seldom gives any problem. You can replace the center diff (which is in your gearbox housing) with a LSD also. Quaif makes center LSD for it. And if you have that all 3lights will be on irregardless if you have AYC issues as the ACD has been removed. </p><p></p><p>I would walk away from a car with 3 solid lights if you do not know what has been done with the car. Many mech in Msia do not know how to properly diagnose issues with the AYC. It could be a simple blown fuse, dirty sensors or the dreaded AYC pump accumulator failure. </p><p></p><p>Good luck</p></blockquote><p></p>
[QUOTE="AlucarD, post: 1063920565, member: 1703"] There is a common misconception that by replacing the rear LSD the AYC will be disable. The AYC is a hydraulic operated system and only way to disable it is to take out the pump or prevent the pump from operating. Normal street car can have both AYC and LSD running at the rear. A good example is the Cusco LSD for the rear that is designed to work with the AYC. To take out the AYC entirely you need to take out the plumbing and fit a non AYC LSD the likes or Kaaz or wavetrack. Also you need to modify the rear housing to enable proper lubrication holes for the normal gear oil to flow into the AYC side. The is normally for race application or if you have RS rear diff that does not come with AYC but a mechanical OEM LSD. If you have problem with the system the 3 lights on your dash with be light up permanently. The 3 lights in your dash is also for the ACD. The ACD seldom gives any problem. You can replace the center diff (which is in your gearbox housing) with a LSD also. Quaif makes center LSD for it. And if you have that all 3lights will be on irregardless if you have AYC issues as the ACD has been removed. I would walk away from a car with 3 solid lights if you do not know what has been done with the car. Many mech in Msia do not know how to properly diagnose issues with the AYC. It could be a simple blown fuse, dirty sensors or the dreaded AYC pump accumulator failure. Good luck [/QUOTE]
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