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6 Jun 2006, 11:16 (Ref:1628390)
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#1 | |
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Racer
Join Date: Dec 2005
Posts: 246
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Differential
Hi all!
I am looking for some infos about limited slip differentials way of working. In particular, i would like to know something more about the salisbury type: preload, ramps, discs etc I was thinking about what happens if, for example, i change my ramp angle in power or in coast side... Help is needed! Thx |
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6 Jun 2006, 14:20 (Ref:1628540)
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#2 | ||
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Veteran
Join Date: Nov 2001
Posts: 601
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my understanding of it is that by altering the ramp angle you alter the speed that the diff locks up either under power or when braking.
preload is effectively the amount of limited slip there is when static. you could wind it right up and the diff is effectively locked or you oculd set it so that there is a relatively large amount of slip allowed before the diff acts... (think this is right  )
Last edited by imull; 6 Jun 2006 at 14:23. |
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__________________
I love the deadlines. Especially the sound of them screaming by...
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7 Jun 2006, 15:25 (Ref:1629319)
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#3 | |
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Veteran
Join Date: Apr 2002
Posts: 9,718
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I'm just about to embark on my first LSD rebuild ( salisbury plate type in an english axle) If I add more shims, presumably theres less free space between plates so the plates will bind sooner when a differential in wheel speed happens ? I guess then the downside is the wear rate will be increased ?
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7 Jun 2006, 17:57 (Ref:1629407)
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#4 | ||
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Racer
Join Date: Feb 2005
Posts: 162
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If you go onto the Hewland website, they have manuals for all their gearboxes.
http://www.hewland.com/svga/manuals.htm The one I downloaded for the F3A has a couple of page description of how a plate and ramp type diff works and how to tune it. |
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8 Jun 2006, 09:23 (Ref:1629803)
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#5 | |
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Veteran
Join Date: Apr 2002
Posts: 9,718
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cool, donloading now, I have an unknown spare in the workshop I'm going to strip as an excercise . . .I'll post a pic of all the bits in a heap next week
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9 Jun 2006, 14:33 (Ref:1630658)
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#6 | |
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Racer
Join Date: Dec 2005
Posts: 246
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Ok let's make it easier.
Let's say i am going to change the ramp angle on power side from 60 to 45 degrees. What should happen to the balance of the car? It should show more oversteer or more understeer when the driver goes on the throttle? I am also looking for any explanation on the way of working of limited slip differentials. Anyone can help? Thx |
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11 Jun 2006, 07:02 (Ref:1631471)
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#7 | |||
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Racer
Join Date: May 2005
Posts: 137
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Quote:
If you imagine the different components of tractice forces at any point of the corner (be it entry, mid or an exit segment) on each corner of the car (ie longitudinal forces, drag, load transfer etc) and the tractive force on each wheel from the diff will vary the handling. An open diff will be good as the driver comes off the throttle, but a spool diff will understeer horribly and the diff tries to push the car straight. |
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