webby wrote:the DR30 LSD I had in my old Skyline locked both ways, so did the TRD 2-way in my mate's smallport AE71. So I'd assume that they're supposed to do it?
Don't see how they'd not lock in reverse anyway
webby wrote:the "ways"actually refer to the amount of lsd-ing the centre'll do under acceleration/deceleration, it has nothing to do with forward or reverse.
Stand on the throttle in a car with a 2-way and it's going to spin both wheels, whether it's in 1st or reverse doesn't matter.
webby wrote:mate, spend enough time around drifters and you learn fairly quickly how these things work. Believe who/what you want, but I'd be very suprised if even a one way didn't lock up if you stood on it in reverse.
Webby for a guy that claims to know all about drifting and a self proclaimed expert on LSDs,
you're way off dude
Billsy wrote:totally depends on the type of LSD.
2 Way, Yes
1.5 way, partially
1 Way, No
Torsion, NFI?
DVSFIN is right this is close.
1 way has a gradual ramp, when there is a difference between the rotation speed of the two axles, load is transferred from the axle that is spinning the least, as it has the most torque load on it, that forces the spider gears pinion shaft to slide on the gradual ramp, to allow the pinion to slide up the ramp and push the side plate outwards, and therefore push the clutch plates/dog gears together to engage both wheels to spin at the same speed.
It does not have a ramp in the opposite direction
1.5 way has a gradual ramp in the forward direction, but a steep agressive ramp in the reverse direction.
So it takes less load to make the pinion push the side plates out and apply load to the clutch plates/dog gears when driving in forward, or spinning the wheels in forward direction.
However due to the steep ramp in reverse direction, it takes more load to make the pinion drive up the steeper ramp, and drive the side plates out to engage the clutch packs.
So if you Dump the clutch in reverse, it will lock the rear axles to spin the same in reverse!
However if you were on wet grass, or sand, depending on how the clutches are set, it may not be able to apply enough torque to the axles, pinion, and therefore ramp to lock it up.
And NO it will not have enough torque to ramp up the steep ramp under deceleration conditions.
Unlike the 1.5way which has a gradual ramp in the forward direction, and a steep ramp in the reverse direction,
a 2 way has a Gradual ramp in Both direction.
So in either forward, or reverse it takes little torque, and load to allow the pinion to act.
Therefore under Deceleration, it Can activate the LSD conditions.
In a straight line, No.
As there is no difference between the wheel speeds, and therefore no difference in torque loads.
But if you stab the hand brake, and get the rear end sliding, or if the clutches/springs are set right, even just turning the wheels, and allowing a difference in wheel speed between the two rear wheels, Can allow enough torque difference to engage the LSD so that you can have the rear end sliding, and stepping out in a desired direction (backing in) as you come into the corner.
So that then allows you to have already lost traction, and allows you to apply acceleration and make it easier to be spinning the wheels as you apply power.
here is a quick video where you can see the ramps in a 2 way
http://www.youtube.com/watch?v=oqcPizDUekI
And a better discription from KAAZ
http://www.youtube.com/watch?v=who5AG3M ... re=related
Now in saying that.
Can a stock open diff centre lock both wheels to spin and get sideways.
Yes.
Due to tolerances in the bearing, and gear mesh it CAN allow the diff spider gears to act as though they are locking up when the wheels are spinning and there is low load on the wheels.
That is why every time it rains i have P platers crashing their cars on the round about out the front of my house, because its the only time they can attemp to "DRIFT"
It can even spin both in Reverse if you are on the grass.
But as we all know it is not a proper LSD, and can come in and out of having both wheels spinning the same speed depending on load.
And thats where you can come unstuck.
Torsion is a full Mechanical helical gear LSD as opposed to Clutch packs and dog gear set ups.
And Eaton Truetrac is also full mechanical Gear design.
However it works the opposite to what you want in a race/rally/drift lsd,
It wants to STOP the wheels spinning, and transfers the torque to the axle with the Most traction, to reduce the wheel with the least traction from spinning...
