Vlsd installed....so how hard/effectively do they lock?

[carheadman]

I recently installed an s13 hicus vlsd into my s14 240, and my question is how hard do these lock because i have a driveway where there is alittle storm drain gutter thing at the bottom, and with my car on coils and a slight grade of my driveway i 2 wheel goin up...so i figured that after installin the vlsd i should be able to get up my driveway without having to fly up but when i 2 wheel it starts acting like a regular open diff...if i pulsate the throttle it sees to budge slightely then back to slipping like and open diff. Is this normal because it is just an oem vlsd so it is very mild...or is mine just completely worn out. THanks everyone!

[xKnownShadowX]

If I'm correct it locks when both wheels spin at the same speed?

I got a R33 VLSD and both wheels spin when I go up my drive way cause one skids as the front dips and rear lifts up.Yeah I go at an angle I'm on coilovers too.

Maybe it's that you think it's acting like an open diff but one tire is just in the air?

[carheadman]

yeah exactly 1 tire is completly off the ground and in the air...i was under the impression that vlsd would make it still lock up in that condition

[liquid_cool]

yeah exactly 1 tire is completly off the ground and in the air...i was under the impression that vlsd would make it still lock up in that condition

i use a welded diff...BUT..lsd's are supposed to lock under load man...they are torque sensing and or pressure sensing like yours...vlsd's work by expanding fluids to lock plates...they do require maintinance every so often..this is an area im not to well versed on..as i run welded...but..you should lock if im correct when one wheel spins freely.

[r3v_v3ng3]

vlsd has to be in certain temps to lock up. it is liquid inside so when its hot it grabs more

[locoluna825]

yea it does^^^^

I got mine outa a 150 xxx mile car the thing chirps on drive ways and sometimes on corners. but i noticed it does it more after it has warmed up. then it starts locks up pretty good.

[xKnownShadowX]

to me it sounds like it's working,but since one wheel is off the ground it acts as an open diff.Does the wheel off the ground skirt or can you hear it rub the ground as your going up until it touches the ground?

Like the rest said it can also be maintenance.

[Kraelic]

Could your VLSD be worn out?

I think I got lucky to find one not abused. I thought the brakes were seized or something when I lifted one side of the car to get under the car to unbolt the driveshaft for towing.

I turned the tire in the air with the transmission in neutral and it was a bear to turn by hand. I was able to loosen the lug nuts with the tire off the ground.

The Helical Torsen diff from the s15 acts like an open diff when one tire is off the ground.

[carheadman]

it might be worn...thats y im gonna shim it once the shim comes in

but i still get 2 wheel burnouts rightnwo..and i can't really tll whether it locks or ot when i try to slide

[OutToWinPAHC]

FYI this is not a technical question. Moved to gen.

[carheadman]

so i shimmed the diff this weekend with one .80 shim and i have to admit im a little dissapointed it still spins one wheel if its in the air, which still gives me a hard time making it up my driveway...i guess i will try 2 shims sometime

[locoluna825]

i think you should just go pick yourself up a j30 vlsd

[adrianfromthecastle]

its a vlsd... it'll do that.

like liquid_cool said, it works by the diff fluid. Under heavy load it'll lock. You won't be able to tell just cuz one wheel is in the air, you're putting little stress on the diff just going up your driveway, you won't be able to get it to lock with that little pressure. That's why its called "VLSD". V for viscous (not vicious).. it uses the viscosity of the diff fluid to do its job

if you want a better lock, get a clutch type diff or weld an open diff.

vlsd has to be in certain temps to lock up. it is liquid inside so when its hot it grabs more

I think you have this concept backwards. It becomes useless after its past a certain temp (basically turns into an open diff).

I have a j30 vlsd on my s13... I can enjoy like 3 hours of drifting (if that.. maybe less?) before I start noticing one wheel not locking. Then I'd have to let my diff cool down for a few hours before hitting it back up. Lets face it, vlsd's were intended for the spirited driver, not the daily racer.

[CkrooK]

+128739927 for Adrian always postin USEFUL information.

You da man

[r3v_v3ng3]

dont have the concept backwards, thats actually what i meant but wrote it vaguely. just like any lubrication, has to reach certain temp to work best but not thermal breakdown then its not doin its job.

yeah exactly 1 tire is completly off the ground and in the air...i was under the impression that vlsd would make it still lock up in that condition

i dont think this is your vlsd's fault, its your suspension thats doing that mostlikely your coilover or maybe your bars making go up in the air. depending on how deep your driveway is and how you slant your car to go in it'll make your one wheel up in the air. my car does this on certain driveway

[krash]

I have a j30 vlsd on my s13... I can enjoy like 3 hours of drifting (if that.. maybe less?) before I start noticing one wheel not locking. Then I'd have to let my diff cool down for a few hours before hitting it back up.

Is that why the JDM cars came with diff coolers?