How do I know if i've got an LSD fitted?

[bryno]

Is there a simple check I can do to confirm if my '94 Supersprint has an LSD fitted or not, i.e. if I jack up one back wheel only, should it be easy or hard to turn?

 

 

[Dave B]

Best way is to jack up both rear wheels, turn one and the other should turn in same direction.

 

Dave B

[Shaun_E]

...unless it is a torque biasing diff in which case it will turn in the opposite direction just like an open diff!

 

Yellow SL #32 - member of Drowned Rat Racing

[Rich N]

One wheel on the wet grass, one wheel on the tarmac, see how it goes when you plant it 😬

[Billyboy]

As MAV said to me see if you can make an 11 😬

[bryno]

^^

Like that idea!

 

So with both wheels in the air, if I turn one wheel and the other goes the opposite way, I still can't be sure it's not an LSD? any other way?

[Billyboy]

HAVE a look here Angus's 7 site - Its very good for understanding an LSD and you could tell what you have IF you whip off a drive shaft 😬

 

Scroll down to bottom of page YWSWIM........

[The Village Idiot]

Find a tight corner (like a hairpin) with loads of run off/vision. (Cones in a car park, or the Stelvio pass )

 

Mid corner second gear give it some beans.

 

If you sit there what seems like an age without accelerating and the inside wheel spinning up it has an open diff.

 

If the car accelerates away as soon as you hit the gas you have a LSD (ps a dab of oppo at this point also helps )

 

Dicks

[Doug]

Looking at Angus's site, this is how an engineer friend explained how an AP LSD works, even he was a bit puzzled by it: -

 

If we say the crown wheel is a fixed point then the only way I can see this working is if the dif assembly internals slide one way or the other according to where we want the drive to go. As they do so they travel higher or lower on the funny shaped faces so the radius effectively increases or decreases giving you a differential. This is how rail wheels work on a railway track so a train can go round the corner. the flanges never touch the rail, they are just there to hold it on in crossings.

 

'Have you any idea what it's like to have the wind rushing through your hair!' (Quote:Sq Cdr the Lord Flashheart)

[Markiebabes]

Hi Bryno

Welcome to the mad house

if your free Saturday there is a meet at Penn 😬 with a pre meet blat beforehand you can then see lots of LSD's in action 😬 😬

 

If you ever fancy a blat give me a shout

 

 

Mark

 

Penn7's area Stuff

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^{_{R400 pure fun ( more so with Aero fitted ) Webshots here}}

[Willie.]

Bryno,

 

Find an empty bit of road or carpark. Roll to a stop with full right or left lock on. Give it plenty of revs and drop the clutch to spin the wheels. If it flicks the tail round you've got an LSD...if you drive round in a big circle with the inside wheel spinning...hang your head in shame and go home and tell nobody.

 

Try it both ways as sometimes the plates in the clutch don't engage and it won't do the job.

 

Willie

p.s. If it does flick round, keep her at it.