L.S.D, When, wut, why? Options

[Lil-Joe101]

Ok, so I see everybody talking and L.S.D.(Limited Slip Differential for those who are behind the curve) When would I need one and wut is the point of haveing one on a FWD car? I saw that TRD makes one for the 3sfe but I wanna know wut is the point of haveing one?

Can anyone answer this question for me?

Thanx

[celica9110]

since ur asking questions....
wtf is LSD?
i know limited slip diff.
but what does it do


^^^^^sorry joe for the thread jack



This post has been edited by celica9110: Jan 3, 2009 - 1:01 AM

[bccentaur3]

The point of having lsd is for better traction. Good for the tracks either the strip or road course. So basically with a non lsd trans you have an open diff. Meaning horrible traction when you are producing power.

Now in my case I have the e153 VLSD trans with my 2nd gen 3sgte swap and I'm spinning like crazy. To be honest it HAS to be the damn tires.

LSD def.

[Lil-Joe101]

Thanx man. Question answered

This post has been edited by Lil-Joe101: Jan 3, 2009 - 1:28 AM

[97celiman]

side note-does trd still make lsd for s54? or was that for a different trans?
would the s54 with lsd be better than an e153 with lsd for a 5sfte producing anywhere from 230-250hp?

[BonzaiCelica]

would this lsd fit the st204. The celica gt.

http://www.horsepowerfreaks.com/partdetail...mited_Slip/1357

also for the description of the trd lsd it says this

The TRD mechanical LSD is 1.5-way clutch-type unit best suited for track use on modified vehicles. It can be switched to a 2-way configuration without any additional parts (except Vitz models). The 1.5-way is recommended for most users because the LSD functions strongly during acceleration, but is weaker when not accelerating preventing understeer going into corners. With the 2-way, the LSD functions strongly during engine deceleration, providing excellent vehicle control under a variety of conditions but requiring a bit more skill from the driver.

what does the stuff i highlighted in red and underlined really mean. if im driving normal with lsd it will be more difficult to turn. So it would be ideal not to have lsd while im using my car for daily driving?? im a bit confused on that. If anyone could clarify that for me i would appreciate it.

This post has been edited by BonzaiCelica: Jan 4, 2009 - 4:39 AM

[BloodyStupidDave...]

wtf is LSD?

A standard (open) differential is a set of gears, typically between the two drive wheels, which allows the wheels to turn at different speeds. This is important for cornering. However, a standard differential can lead to loss of traction under extre

When there is a difference in traction between the left and right wheels, on a car without LSD (a car with open diff), the wheel with the most traction will move less and the wheel with less traction will rotate more (scenario A). Taking this to an extreme, if one wheel is in mud or on ice, that is the wheel that will rotate and the one with excellent traction will stay put (scenario B). It should be clear that both scenario A and scenario B are the opposite of what you want.

An LSD is a clever set of gears, a little like a clutch, which allows for small differences in rotation speed between left and right (such as is needed when cornering) yet continues to drive both wheels even when there is a large traction difference between left and right.

The wikipedia article, while technically acurate, isn't a particularly good introduction to the subject. Try these instead:
http://www.drivingfast.net/technology/Differentials.htm
http://auto.howstuffworks.com/differential4.htm

This post has been edited by BloodyStupidDavey: Jan 3, 2009 - 8:02 AM

[jdg371]

LSD is a type of drug that very bad you see..... hmm k





Limited Slip Differential helps with putting the power down. The best example I can say would be..... you would like 300whp through 1 tire or 2?

[97celiman]

would this lsd fit the st204. The celica gt.

http://www.horsepowerfreaks.com/partdetail...mited_Slip/1357

i dunno if you are asking or telling but this would fit i believe (dont take my word for it)
the price tag is about 1k though so im imagining finding a e153 trans with lsd (from mr2, do the solara ones come with lsd?) is cheaper?
is this why people do it, that and the e153 is just a beefier trans and can take the load of a turbo or swap car?

[808celica]

would this lsd fit the st204. The celica gt.

http://www.horsepowerfreaks.com/partdetail...mited_Slip/1357

I highly doubt it, since its not the US gt's???

but then........... 91-95 NA m/t MR2?????? possibility???

[_Jim_]

would this lsd fit the st204. The celica gt.

http://www.horsepowerfreaks.com/partdetail...mited_Slip/1357

also for the description of the trd lsd it says this

The TRD mechanical LSD is 1.5-way clutch-type unit best suited for track use on modified vehicles. It can be switched to a 2-way configuration without any additional parts (except Vitz models). The 1.5-way is recommended for most users because the LSD functions strongly during acceleration, but is weaker when not accelerating preventing understeer going into corners. With the 2-way, the LSD functions strongly during engine deceleration, providing excellent vehicle control under a variety of conditions but requiring a bit more skill from the driver.

what does the stuff i highlighted in red and underlined really mean. if im driving normal with lsd it will be more difficult to turn. So it would be ideal not to have lsd while im using my car for daily driving?? im a bit confused on that. If anyone could clarify that for me i would appreciate it.

Basically, 1.5-way clutch type unit is only "activated" or truly "LSD" under load, or "hard" acceleration. So Basically when making a turn at normal speeds and not hammering the gas, the car WILL turn as nicely as a car with NON-LSD.....or open-diff. I can feel it when I go around a corner, anybody can. It is VERY noticeable. If I am going around a rotary and driving like I am supposed to, the car is fine. But if I push the car hard around the rotary I can feel the car wanting to "straighten out" more. Which makes total sense because when entering/making a turn, the outside wheel is spinning at a faster rate then the inside wheel, but when the LSD is "Active" both wheels want to rotate at the same pace/speed.

For example, think of a compass (the tool used to make circles, not the tool used for dictating north) So you set up your compass to make a 10inch circle. So you center pin is in the center of where you want to make your 10" circle, and you outside pin is 5"from there. Now make your circle. But instead of pins, imagine they were tires. The center pin/tire would actually not move at all, just kind of get pushed to follow the direction of the outside tire, but not actually rotating, still staying on the same spot where it contacted the groud before you started. But your outside tire is actually rotating/moving at a given speed. So for argument sake, call it 10mph, where your inside tire is actually moving at 0mph in order to accomplish this circle.

That is how an open diff works, and this was an extreme example to help visualize what I was saying. Now a 1.5-way LSD works identical to an open-diff when driven without load through a turn. Where as a 2-way LSD is much more aggressive. For lack of a better term, it is "always active," which makes turning a lot harder, and less "tight" (tight meaning the smallest circle that can be made by the same vehicle) A car with a open-diff and a 1.5way diff will essentially make the same "tight" circle when turning, where as a 2-way diff can not.

But as for "when" a LSD in "needed"....there really is no preset number because driver skill will play a big role at what power level the transfer from open-diff to LSD is made. But for your average driver.....If you plan on making over 200whp (and assumed associated torque is also around 200wftlbs, because that is the real problem when dealing with traction from a stand still) then I would say go with an LSD.

This post has been edited by _Jim_: Jan 15, 2009 - 11:19 AM

[97celiman]

so 1.5 lsd would be best for the daily/occasional weekend road course car. im nnot sure if my question was answered though?...it does or doesnt fit usdm gt's? im going with no but im not sure
ppl are kicking me off so i must go
thanks for your help

[Culpable04]

the one for the MR2 non turbo ( 91-95 ) fits

[97celiman]

right i mean this trd 1.5 lsd, does it fit usdm gt celicas?
and did the non turbo mr2's come w/ lsd?
im assuming yes

[bccentaur3]

NA mr2s came with the s53 trans IIRC not the s54. No they did not come with lsd.

[terqui]

That site has an LSD for the 4age, would that fit the 7a tranny? Im assuming no because its not the same used on the 4a.

[Culpable04]

you can get a tranny from a 4sge equiped car and use it with your 7a