How to determine whether your C56 has LSD?

[TRD_ZERO]

Ok my 2c isn't gospel but from what I know the c56 gearboxes that came out of prefacelift superstrut levins/truenos were LSD. On the build plate the gearbox will have c56xxA - "a"= open diff and c56xxC - "c"= LSD. I really don't think it's c56xxB like said on wiki. Do you know what car it came out of? but then again you can't be certain to check the build plate on that either as boxes can get replaced quick snap.
Ace sniper did a great thread somewhere with pics showing open diff, torsen and plate type LSDs. My c56 LSD box that I sold awhile ago had a plate in the middle with little gaps either side so not like stated above that you can see through it. I have a e58 box now and it has the bar inside and looked nothing like that either obviouly as it viscous.
I also go stuck half on the grass and half on concrete and just spun the one wheel.
If you really really want to know just take the time to pull the drive shaft out and have a look take a photo and go from there. Atleast you won't have to keep trying to find weird methods of establishing whether is LSD or not.
That's all I got hope it helps.

[rollaholic]

Drive car.

Will become VERY obvious when accelerating out of low speed corner if car has working LSD or not.

/shrug.

this really, even if it has the magic bar or whatever that doesnt tell you if its actually giving both wheels drive.

[Kiwi-Corolla]

Cheers for all of the replies. Sounds like pulling the shaft out is the only way to truly determine if it's an LSD box. I actually need new front tyres soon so will no doubt pull a quick burnout before I get the new ones fitted. Haven't done one of those since I was about 16

[XS1V]

The C56 ratios are the same as mentioned so the test you have been told is another internet gem. The LSD in the C56 is torsen so can be tested by the standard Torsen test, a little hard when in the car but:

Spin the input shaft of the diff. One wheel will may spin freely with the other stationary. I can hold one axle still, spin input shaft and the other axle will spin free. If I try to stop the spinning axle with my leg, just let the spinning axle rub my calf for example - the axle I am holding still with my hand will instantly start spinning in same direction. As soon as any torque is applied to the spinning axle - torque is transferred to the stationary axle and they spin together. TORque SENsing.

If you are doing the axle out check there will be a metal plate in there when you look through as opposed to the metal bar on the standard diff.

Brad[/u]

[Kiwi-Corolla]

Bit of an update on this - I did a few burnouts yesterday and still couldn't really come to a conclusion. The burnouts were surprisingly hard to do as the car would try and gain traction shortly after the wheels started spinning and would begin pulling away, making me think that it does possibly have an LSD gearbox. I could see the two black lines where the burnout started but it wasn't laying down enough rubber to leave clearly visible marks further down the road.

I tried three different techniques. The rev it to redline and drop the clutch technique, the chuck your handbrake on and drop the clutch at full redline technique, and the roll-back technique revved all the way to 8,000rpm before dropping the clutch.

All three of those methods resulted in the car spinning both wheels and then the tyre marks became almost invisible slightly after the initial wheel spin as the car started getting traction. All of the 'tests' were done on flat black smooth tarmac, bone dry with partially worn tyres.

Opinions anyone?

[Grrrrrrr!]

2 x spacesavers, try again

[iOnic]

Enter a corner at low speed in low gear. Bury right foot. Soon know if you have an LSD or not

[Leon]

Enter a corner at low speed in low gear. Bury right foot. Soon know if you have an LSD or not

This. Especially if it's wet.

One wheeler peeler with inside wheel spinning uselessly = open.

[touge_ae101]

I would say yes it is from your description. the c56 lsds are a viscous type which tbh doesn't really work like a lsd unless both wheels are loaded evenly. it is not like a plate type diff that always spins both with a certain amount of slip..

easiest way to tell is a standard engine won't wheelspin through 2nd gear if it has a standard lsd...

plate type/trd diffs are the best thing in the world to do to your fwd makes them handle and drive amazingly. throw standard lsd away...

[diss7]

If you can't tell if the car has an LSD or not, then just say it does for Wank factor. Because clearly you don't need an LSD if you can't tell whether it has one or not.

[iOnic]

^like.

[KinLoud]

the c56 lsds are a viscous type which tbh doesn't really work like a lsd unless both wheels are loaded evenly.

No
They are torsen type lsd - very different and way better than viscous

plate type/trd diffs are the best thing in the world to do to your fwd makes them handle and drive amazingly. throw standard lsd away...

I disagree (for a road car)
I put a 20v into a Marino with c56 open diff, adjustable shocks, higher rate springs, good tyres. It handled really well (I drove it very hard)
When I sold it to my mate he asked me to put a trd plate lsd diff in the gearbox (one I had lying around).
It was harder and slower to drive on the road! You'd end up with power understeer (even in the dry).
We changed it to a torsen type lsd and it was waay better/faster/nicer to drive.

Ken

[sergei]

torsen is much nicer than plate on FWD.

[pc]

torsen is much nicer than plate on FWD.

Agree, plate is good when you have good tyres on a good surface, but not so good for all types of road driving.

[touge_ae101]

it depends a lot on how the plate type is set up and what oil you run. I've only had good experiences. transformed my understeering ae101 into a rocket ship both on the road and on the track. bit of a knack to driving as you feel the understeer coming in slighly earlier but is easy to drive around and mid corner and on the exit there was so much more grip there with a good diff.



..but back to OP I agree with what diss7 said!

[d1 mule]

yet another case of the answer to your question being thrown in front of you 15 posts ago and you havnt done it and still have no idea.

GO DO A $&#$% SKID = question answered in 5 seconds

FFS

[Bling]

Opinions anyone?

I'm surprised you haven't killed this car yet. Won't be long at this rate though, you'll have the proof sitting on the tarmac. Will be easier to inspect in bits. Why do you care so much if it's LSD or not?

[RobertC]

Did anybody else think "Troll" then they read the reply? Dropping clutch in the dry @ redline with the hand brake on???

But if that is the case, an open diff box would easily smoke up on the spot. LSD would probably drag the car along.

[Kiwi-Corolla]

yet another case of the answer to your question being thrown in front of you 15 posts ago and you havnt done it and still have no idea.

GO DO A $&#$% SKID = question answered in 5 seconds

FFS

If someone told you to jump off a bridge to see how deep the water was, would you do it? No, chances are you'd think of another way to find out. Doing a burnout was the last option for me. I'm not going to willingly smoke up my tyres if there's an easier alternative of finding out . It made a lot more sense to wait and read people's replies, rather than just start destroying shit because somebody said "do a skid bro".

I'm surprised you haven't killed this car yet. Won't be long at this rate though, you'll have the proof sitting on the tarmac. Will be easier to inspect in bits. Why do you care so much if it's LSD or not?

Meh, these engines are built for abuse, and if it blows I'll just whack another one in - Simple . I'm just genuinely curious if it has an LSD box or not. Don't have a specific reason, just want to know.

Did anybody else think "Troll" then they read the reply? Dropping clutch in the dry @ redline with the hand brake on???

But if that is the case, an open diff box would easily smoke up on the spot. LSD would probably drag the car along.

That's exactly what the point of the test was. If it was going to spin up and give me any definitive proof that it was an open diff then surely dropping the clutch at 8,000rpm with the handbrake on was going to be the best way to find out.

[diss7]

Your second statement completely contradicts the first. Talk about changing your mind to suit the arguement.

Just stick this on the car and be done with it...