Quote:
Originally Posted by bigjae1976
Looking at used E39 M5 diffs...seems much easier and more economical to go with a Diffsonline 3 clutch unit.
Question, by variable ramp angle, do they mean that there are different lock up rates under acceleration and deceleration like a 1.5 way Kaaz? Or does it refer to being able to customize the ramp angle(s)?
A steeper ramp angle means quicker lock up?
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This depends on the angle is measured.
With OS giken it's the other way around. With ZF LSD (210mm diffsonline for example), an angle of 30/90 means that the LSD is 1 way:
30 angle on acceleration means that it will lock less progressively than 45 degree stock (the end locking is the same though, that depends on the clutches, friction material, etc ...)
90 degrees on deceleration means that the LSD will not do anything when decelerating since the 90 degrees angle will be blocking the spider gears support from engaging the clutches and hence will be an OPEN diff.
Stock is 45/45 which is a very neutral and safe.
Diffsonline can also do a variable ramp 30/60/90 and drexler can do a curve ramp instead of a straight line:
a 30/60/90 is a 1 way diff that on acceleration will initially have a less aggressive lockup pattern and after arriving to a higher degree of slip the diff will still be locking up progressively but at a more aggressive pace as the slip becomes greater. (it could be also the opposite, depending on how the LSD is machined and what the race driver wants the car to behave like)
This kind of variable ramp can only provide a benefit for a very very skilled driver as he will need to be able to pull off special driving tactics like entering a corner and rotating the car with the LSD benefitting from the progressively aggressive lockup.
Now to images:
This is a 55/90 on the right and 45/20
This is the link and image for example:
