Lsd gearbox???

[Kiwi6539]

Hi. Car ae82 gt (fxgt) racecar.

Can anyone help. Swapped my gearbox today as gze box was not lsd. Bigger and stronger but wheels spun in opposite direction when Jacked up. So I installed a lsd box in my corolla gt today. Not exactly sure what the gearbox is out of but has the hex Bar and when jacked up both wheels spin the same direction.

All good I thought. It is lsd.

Once running did a practice start to test out. Result drivers side wheel spinning leaving a black mark and passengers side. nothing. Although didn't go inspect the road closely to see if passengers side tried too spin.

Can anyone tell me if this can happen with and lsd??

Or chance it's worn or even the lsd oil could effect result?

Cheers

[mega4a]

i have a ae101 4agze lsd box on mine and from time to time it one wheels most likely to be worn viscous lsd.

could also be the wrong oil or old oil.

http://www.youtube.com/watch?v=w2bRb17jJ1U

[Kiwi6539]

Cheers for reply

I'm guessing worn but will look at changing oil I put in. Was for lsd.

What oil or mix how you found best for viscious lsd?

Racing Sunday

[Crucible]

They are getting a bit old now and most have had a hard time. A friend brought two and both wouldnt hook both wheels up so he gave up, would in the wet on corners but not in the dry off the mark. Worn I guess?

[Kiwi6539]

Update.

After doing research tonight I'm lost as to what box I have installed. Should have checked more stuff out but rushed getting ready for racing

Vicious lsd or plate I have no idea. The gearbox shaft seal I purchased from repco measured of my gearbox came up as an e box. But what model I have no idea?.

Does anyone know if the gearbox axle seal are different diameter on the C boxes repco seem to think they were.

So what oil to use as lsd didn't seem to work to well on a full race start.

I have 3 gearboxes to with hex bar one in car now the other pretty sure mr2 box only on option for start motor.

And what I think is a gze box no hex and wheels span opposite way. Much bigger stronger looking gearbox. But not lsd. Bigger shafts too that would not fit the other 2 boxes.

So lost can you tell by counting splines on shaft that fit the smaller boxes.


Just want to get right oil for the box in now. And see if maybe lsd is knackered. Or one wheel spinning can still happen in certain circumstances?

Any advice would be greatly appreciated!!!

Or ways to tell by numbers on the box axle seal in box diameter size, splines etc

Cheers to any one who can offer some insight for me.

[Grrrrrrr!]

Cheers for reply

I'm guessing worn but will look at changing oil I put in. Was for lsd.

What oil or mix how you found best for viscious lsd?

Racing Sunday

Viscous LSDs are a sealed unit, the LSD wont care what oil you run.

[Mr Revhead]

No stock FWD toyota box is a plate type to the best of my knowledge. They are either viscous, or helical type.

Viscous can spin one wheel. Also not sure viscous can wear out?
Helical will as well, they need resistance to work and they are softer than plate type. Hence why they are used on FWD
Plate type can also spin a wheel if worn or wrong oil.
Wrong oil will not affect viscous, the viscous coupling is sealed.

Stock LSDs are soft, they will not lock up solid like an aftermarket plate type.
I think you have normally functioning stock LSDs.

[Kiwi6539]

Thank you for that information.

And what I understand is oil doesn't make a huge difference to the viscious lsd. What about the other option. Helical

Just wondering if I should replace the oil I put in there..

Taking it for a good long run tomorrow to see how it feels on some twisty up down or camber etc roads.

To see if notice a difference for the old box.


So happy to hear a lsd can spin one wheel from a hard launch.

So guess just want to know what oil I should run for the other to options?

[Mr Revhead]

Helical is done by gears, so oil won't affect the LSD operation.
Don't forget: LIMITED slip diff.
Soft factory ones still allow slip and won't lock up.

Normal gearbox oil is fine. I forget the exact numbers though

[sergei]

I believe that viscous when wears out it will become stiffer not other way around.
With torsen/helical you must use GL5 oil.
With viscous you can use anything from engine oil to ATF.
Some hondas run plain engine oil (10W30 stuff) in their gearboxes.

[cat007]

I believe that viscous when wears out it will become stiffer not other way around.

Really? I've heard of some caldina owners who's center diff, which is viscous, become 'loose' over time causing the fronts to light up and the back do nothing...

Or is this comparing apples and oranges?

[Lloyd]

The viscous units should be sealed, so gearbox oil shouldn't make any difference.

[mega4a]

but the viscous does work off the oil doesn't it ? like the dude explains in the video i posted and the viscous plates wear down after time. and the viscous lsd is made to one wheel like in corners one wheel will be spinning faster than the other so it has to act like an open diff but in a straight line it will two wheel.

if it was a sealed unit what would be the point of axle seals and why does oil leak out from the diff if i was to pull an axle out ?

[touge_ae101]

chances are you have a c56 box. Was it out of a 20V engined car?

they have shitty viscous LSD's really aren't a 'true' LSD and are pretty useless on the track (still loads better than no LSD mind you). They can't be modified or shimmed up.

What you need is a TRD plate type LSD set up in 1.5way (thats their standard setting). will reduce understeer and settle the car as well as giving you more grip than you can use. Kaaz is also another good option (may be slightly cheaper). Hit up our sponsor Mark/1i1 for latest pricing iirc TRD option $1250. Will be the best money you ever spend on the car.

[Mr Revhead]

but the viscous does work off the oil doesn't it ? like the dude explains in the video I posted and the viscous plates wear down after time. and the viscous lsd is made to one wheel like in corners one wheel will be spinning faster than the other so it has to act like an open diff but in a straight line it will two wheel.

if it was a sealed unit what would be the point of axle seals and why does oil leak out from the diff if i was to pull an axle out ?

The LSD part is sealed inside the gearbox. So it has its own no replaceable oil inside.
I guess maybe viscous plates/turbines. whatever could wear down, I don't know.


I'd only ever go for a plate type LSD in a FWD if it was a track car. I'd avoid like the plague for a road car.

[Grrrrrrr!]

Viscous units can fail open or locked, depending on failure mode. If it fails due to thermal/shear breakdown of the fluid they go open since the fluid becomes the consistency of water, but if the internal rotors warp they often bind up quite tight. Neither is going to be good in a FWD car.

[Lloyd]

but the viscous does work off the oil doesn't it ? like the dude explains in the video i posted and the viscous plates wear down after time. and the viscous lsd is made to one wheel like in corners one wheel will be spinning faster than the other so it has to act like an open diff but in a straight line it will two wheel.

if it was a sealed unit what would be the point of axle seals and why does oil leak out from the diff if i was to pull an axle out ?

Here is a pic of a random viscous unit by itself, cut open. (Actually from a Landrover VCU, which are prone to sh*t themselves, but basically the same as what would be in your LSD)

The splined bit in one side is where your inner CV fits. The viscous unit is part of the diff and the whole lot is enclosed inside the gearbox. The whole gearbox and diff all run in gear oil to keep the gears and crown/pinion/spider gears happy. Axle seals stop all the gear oil from coming out.

The viscous unit itself is filled with a silicone fluid rather than a gear oil. Normal oil gets thin when it gets hot. Silicone fluid does the opposite, it basically turns to goo rather than a liquid. When you end up with the plates and the housing turning at different speeds then things get warm and the goo essentially starts to lock the plates together. As far as wearing out, I'd imagine that it's like any lubricating/hydraulic/anything fluid and that it loses its properties over time.