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CLSD VS VLSD
StraightAwayZ |
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Theres a few ways a C-Lsd can work (but all generally work on the same principle). The one were most familiar with are the cam-styled 1, 1.5, and 2 way lsds. Basically as the diff spins, a little cam gets forced into a ramp- The harder it gets forced into the ramp, the more tension itll put on the clutches (Clsds are all about pressure between the clutches). 1 way lsds for example only have 1 ramp to push into, and are flat on the other side. When you accelerate, that cam locks down into the ramps and applies "extra" pressure to the clutches, which makes it harder to get "slip" between the clutch disks, which essentially locks the wheels harder together. When you decelerate, it hits against the flat side- so no extra pressure is applied beyond the static pre-load of the diff. 2 ways on the other hand have a cam on each side, so if youre accelerating or decelerating itll apply extra tension and help keep the wheels locked together (This is why drifters like them). 1.5 ways are designed so they add a "little" extra on decel, but having a slightly different shaped cam to press into the clutches. Below is a picture- hopefully this explanation has made it clear what youre looking at. And again theres other ways of doing this- Take for example stock corolla GTS rear ends. Theyre not 1, 1.5, or "2 way" in the sense- They dont have these cams at all. All they have are some springs inside that attempt to apply pressure on the clutches. This is why theyre notoriously weak, and have very minimal break away torque from the factory- Which brings us to another term Break away torque is how much torque you need to cause the clutches to slip. Small break away figures require little effort to cause the insides to spin, larger figures require more and essentially "lock the wheels harder together". So if you corner in a car with little break away torque, chances are the clutches will slip a bit and only some of the power will be distributed to both wheels (again, because the inside wheel will be allowed to slip against the outside wheel). One with a higher break away torque will keep the wheels locked together firmly, and probably cause the inside tire to slip. Theres advantages/disadvantages to both of these depending on what you want to do. A high break away figure means youll always power both wheels, but too much means youll have little difference than if you drove with a welded rear end, youll always be fighting big under or oversteer, because the inside wheel will always be "slipping". On the flip side lighter break away torque means youll hopefully give "just enough" power to the inside wheel, so that it helps power the car- and hopefully will help you avoid spinning a tire so you lose acceleration potential- But too light and youll be no better than an open dif and will always spin the easiest tire to spin. Now onto VLSDs- In as simplest as I can describe them, theyre essentially torque converters (like in an automatic transmission) for your differential. As the diff rotates they build up fluid-pressure, and that pressure is what causes the axles to be powered together. This is why theyre a bit finicky, this is why they dont work when a tires up in the air (no resistance to build pressure), this is why they act different when they get hot/cold, and etc. Just my 02 cents, if ive stated something wrong i welcome people to correct me.
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StraightAwayZ |
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Legendary Emperor
Group: Members
Posts: 296
Member No.: 1,547
Joined: Nov 28th 2007
Location: Update Profile
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Would it help keep it cool, yes. How much will it reduce temps by? Loaded question with a lot of variables. How much fluid is in the system, how much air does the exchanger get, how big is the exchanger, and what kind of driving will you be doing.
Diff coolers are neat if you plan to track the car seriously for half hour or longer sessions, but kind of redundant otherwise. If youre not over heating the fluid, you dont really need one imo. The oil needs to be at a proper temp to work right too, too cold and youll do more harm than good. Not sure if thatll be a factor or not honestly, but its worth checking.
Whats your intended purpose for the car? If 99% of the vehicles time is going to be spent on the streets, I wouldnt bother. If you plan to track race regularly, it might be worth looking into- Id recommend monitoring the temps under track conditions a few times though before you decide. You may or may not be getting too hot- You can use a simple heat-gun on the diff as soon as you pull in, or use some thermal tape (changes colors as it gets hotter) to see the hottest it got to.
Vlsds are "Decent" for track racing, but thats about it imo. Theyll help you put down a little more power than an open diff- but thats about it, and thats only if you dont slide/spin a wheel (in which case itll act like an open dif), or pick the inside tire up on a corner (again, open dif).
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