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|In USA, all the FWD Honda's with the
exception of the Integra Type-R and the new Prelude SH with
ATTS are offered with any type of limited slip differential. The Civic
Real-Time 4WD Wagons came with a viscous coupling center LSD, and the
Acura NSX also has LSD (clutch type I believe).
Differentials allows the wheels to turn at different speeds. They are
essential in street cars for drivability especially in low speed turns.
Under most everyday driving conditions, the standard open differentials
works just fine. How ever, if one wheels starts to spin such as slick
surface or when you are trying to power out of a tight corner, the
spinning wheel would keep on turning power into smoke unless you back
off the gas pedal.
There are mainly three types of LSD - viscous coupling, clutch pack, and
torque sensing (Torsen). Each type has their pros and cons.
Part of this was from a post relating to the IS300, someone was asking
about the difference between the LSDand the VSC option on their car... I
figure i would share, because some of you out there may be interested.
This is not technical by any means, but it is a good start to be able to
tell the difference between the two.
Im just going to take a stab at this, but if VSC is similar to other
anti-skidding systems found on other cars thisshould be informative.
VSC is used to control understeer and oversteer, which is by definition
the car skidding. Understeer as you know is when the car is losing
traction up front, most commonly associated with front wheel drive cars.
While rear wheel drive cars have the ability to power oversteer.
Understeer is easier to control IMO, and is safer. Some reason for
losing traction are as follows, power to overwhelm the tire\'s traction
causing it to slip since there isa thing called a traction circle, or
transfering weight off from the tires in question..less weight = less
traction. It controls it by applying brakes to individual wheels in
order to manipulate load and correct the error. Understeering can be
solved by application of brakes because it throws the load up front,
more load, more traction. If your over anxious and powering through that
hairpin turn, your going to power oversteer the car, so VSC i would
imagine limits your throttle and cuts back so you don't spin the rubber
and lose traction. Basically it manipulates load transfers.
LSD - Limited slip differentials are used instead of open
differentials for performance reasons. When you turn, the inside wheel
has little weight on it as the load transfers to the outside wheels.
With an open differential, the power will go to the wheel with the least
resistance (the inside wheel), and it will just spin, what do you get?
nothing. Ever notice those cars that do burnouts at a track to warm up
their tires, and sometimes only ONE WHEEL SPINS, that's an open
differential. Limit-slip allows the car to sense which wheel is slipping
and transfer power to the wheel (in increments) to the wheel with the
resistance. I guess you can say "from the wheels that slip to the wheels
Kinds of LSDs.
Well there a few kinds up there, helical, viscious, active, viscious
coupling and im sure a couple more since they all have variations. Some
require clutch plates and gear oil as regular maintenance, breaking,
while some of them just "bolt on" and drive. The former would be a
mechanical LSD, and the latter, a helical LSD. Which one is better?
Beats me, just like most questions like that, "it depends".
1.5,2 way LSD.
Ok, well a 1-way LSD only is active when its moving in one direction.
and that happens to be while your accelerating. When you are off the
accelerator, your LSD will not be active, and thus the benefits for
having one is nullified.
1.5-way is the medium between 1 and 2, as the name may suggest, however,
it\'s still not much better than the 1-way, because the 1.5way LSD, is
particularly active when your on the accel. but let go of the gas pedal
and you will find that the effects are very little.
The 2-way, As you may have guessed, these are "better" than the 1.5 way
because these remain active whether or not your foot is smashing the gas
or the brake.
Traction Control, in the simplest sense i can think of, basically cuts
the power until traction is regained, this is from my observation on a
few cars that had this feature, once they start slipping the engine
pulls back and viola traction will eventually be regained.
Launches, cornering will be improved with the use of an LSD. Because
your not spinning as much and actually getting power down to the ground,
not just using kinetic friction.
Bad weather / sloppy driving will be
assisted but the VSC however, i do feel that it takes a lot out of the
actual "driver driving the car".
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