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Can someone help exlpain LSD to me? Would it be beneficial on a civic? Thanks.

 
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*waits for Grey, the allmighty car god, to come explain this*

 
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Man you are a post *****!![IMG]i/expressions/face-icon-small-tongue.gif[/IMG]

 
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Limited slip essentially "ties" your front wheels together so they rotate at the same speed. You'll notice that the car tends to torque steer hard in right turns. This is because the inner wheel is rotating faster than the outer. LSD eliminates the speed difference between the wheels so it should knock out most of the torque steer. It also helps to do 2 wheel burnouts, but that's a side effect. It would be beneficial if you were racing and the what not because it would make the car track straighter under hard acceleration and you'd have both wheels pulling equally out of corners, but for everyday driving it's something that can be done without. I don't know if there is an LSD for our cars yet.... might want to check with Quaife... they make good ones.

 
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Yeah, the front wheels don't spin at the same rate. This is so that you can turn and not have the wheels chirp as you make the turn. So yeah, solid axle is out. Those are only good for some off-road situations or maybe tractor pulling. Anyway, we've got a cheapie differential that allows the wheels to spin at different rates. This is good for simple low speed turning, but practically nothing else. You go over some snow and the cheapie differential will make the wheel with less grip have more power from the engine transfered to it. Stupid huh? It should be the other way around. The differential should transfer power to the wheels with more grip. Hence the name Limited Slip Differential.

Ever do a burnout in out cars? Most likely you'll only do a one wheel burnout. Although I've had a couple two wheel ones. This is possible if the gears inside the differential get "stuck" and spin together acting as a solid axle. I'm not sure how the design allows for this, but I've personally left two tire marks on my street for like 10 - 15 feet, so it is possible. Now, with an LSD you can do two wheel burnouts all day long. More traction off the line means a shorter E/T in the quarter mile.

Snow is less of a problem as are ice patches with an LSD. Ever get stuck on the side of the road where one wheel is spinning and the other is standing still (the one with the grip). Yeah, that sucks. No more of that crap with an LSD.

Also, cornering is improved. It's all about traction. You have more traction when you apply the gas through a corner since the LSD will transfer power to the wheel with grip. Probably the outside wheel in a corner.

Quaife does make LSD's; although their design is a locking type. I've read about their design a while back, but I can't remember how their design is different from a regular LSD. Check it out: Quaife America

 
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LOL [IMG]i/expressions/laugh2.gif[/IMG]

 
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What about Phantom Grip? I mean i don't want to drag race with my civic, but I might be interested in upgrading a little to perform better.

 
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Someone answer! Id like to know too

 
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From what I have learned about Phantom Grip is that it is CRAP!

The springs inside of it are not that great and they loose their ability
to expand after about 4 months.

 
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Am I the only one who chuckles when they read about Quaife? I just cant help but replace it with quefe..or however you spell it.

 
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It's works a little bit, but it wears out quickly. Kinda sucks IMO. I'de save your money and get a real LSD if you seriously want one.

 
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I want LSD. Accelerating hard after turns drifts to the outside(or during turns). On hard turns my inner front wheels gets off the ground(Tein has about 2 inch stroke - with my front tires off the ground, the gap is about stock) and spin. The outer wheel does nothing and I slow down. Just another thing to get for my car. Personally I rather sell my car and head down to MotoREX and request a S15. It would be nice.

 
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What you are describing is Throttle induced Understeer. An LSD isnt going to fix that. What the LSD will help with on the corners is Corner Exit Acceleration. when you go through a corner, weight is transfered to the outside of the car. and Since we ushually slow for a corner, weight is also transfered to the front. so In a corner, the Outside Front tire is doing A whole Lotta work. Our Fun little civics as every one here knows is front wheel drive, so when you press on the accelator durring a corner, you place more Demands on the Front tires which are all ready dealing with turning the car. So the front of the car ends up sliding more because Tires only have so much traction and by trying to accelerate while turning ushually ends up exceeding the total traction availible.

An LSD Helps the Corner EXIT acceleation. when a "Normal" Diff is pushed throug a corner, as stated above, the weight is transfered to the Front ouside corner. and as we know a standard Diff will transfer more power to the wheel that has the least grip. The resulting action ushually causes the inside tire to break free and spin causing you to accelerate very little as you come out of the turn.
With An LSD, in the same instance, the power will be distributed evenly between the two tires. this in turn allows the tire with the most grip(outside) to be able to accelerate the car better. HOWEVER, if you try to accelerate to much, you will still get throttle Induced Understeer.


[IMG]i/expressions/beer_yum.gif[/IMG]

 
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So basically you are saying to go all out (with Quaife) or not at all. There is no improvement that isn't so expensive?

 
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He said there is but it doen't last....in other words waste of money

 
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to further elaborate, if you had a full limited slip, and went through a corner you would suffer extreme understeer, this is why most cars come with no limited slip from the factory, this way the majority of drivers(ignorant to decent driving tecniques due to lack of training)wont get into an accident so easily. you do, however, liek grey stated, wnat a limited slip for after you pass the apex and want the best possible traction for good exit speed.


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You go over some snow and the cheapie differential will make the wheel with less grip have more power from the engine transfered to it. Stupid huh? It should be the other way around.


think of it this way, nature is lazy, the power takes the easiest route, usually the spinning wheel


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Although I've had a couple two wheel ones. This is possible if the gears inside the differential get "stuck" and spin together acting as a solid axle. I'm not sure how the design allows for this, but I've personally left two tire marks on my street for like 10 - 15 feet, so it is possible.


in this situation, i think its a matter of there being no "easier" route for the power to go to, another example of this is cruising down a straight highway with the cruise set, or whatever, both of the drive wheels are going rougly the same speed, so again theres on "easier" way, so power gets applied pretty much evenly