Doctor

Hi Paul, what are the ramp angles in the ZF?

MTL in 6 speed felt like a bag of spanners. Not happy. 

I believe it is still no spectators?

Hi Noel, done my reading, you are right. The LSD additives are designed to allow the LSD plates to slip when not engaged thus decreasing the noise. Not much of an issue using non-LSD oil in the LSD (more noise), the issue is using the LSD oil (by mistake) in the synchro mesh gearbox. 

Confused is my middle name.

I have a temp gun, so easy to measure temp. It is very crude, but all you need is a trend.

No, the thicker oil is not going to cause to run in cooler, but is will be slightly more resilient to heat cycles.

SPC Tracsport oil is 75W-90. As it doesn't slip, the temp stays at about 85'C, so no need for 75W-140 that CC recommends for Titan. 
 

beware - the oil has to have the LSD additive, otherwise the LSD slips.

*thumbup*Perhaps. 

Hi Scott - this is just to show the difference in size or the casing. BMW type 168 diff has a bracket on it to replicate the mounting points of the 7" Sierra diff to be able to be fitted to Caterham chassis. CC uses different back plate (BMW usually has air "oil cooler" at the back) in order to keep the size compact. Seeing SPC Tracksport going in the Sierra casing (how tight the fitment is side to side) I would be very surprised if you could squeeze the same unit into the BMW 168 casing. The TITAN LSD unit is way smaller. 

https://caterhamparts.co.uk/differentials/4453-caterham-diff-3-91-lsd-assmebly.html?search_query=differential&results=45

https://caterhamparts.co.uk/differentials/4795-diff-assy-3-62-with-lsd.html?search_query=differential&results=45

Not sure about that. Both LSDs might be from TITAN, but it is not going to be the same diff.

John - no it doesn't. ATB stands for automatic torque bias and is the same as Torsen - torque sensitive. It has gears inside, not plates, so just regular oil changes. It is OK for gentle road use (Audi used to use it in its longitudinal engine vehicles as central differential), but useles on the track. It doesn't lock fully, it just transfers a portion of the torque to the outer wheel (usually the one with more traction). The problem is that if your inner wheel hits the bump and (even momentarily) gets airborne, the car looses the drive as portion of zero is still zero. 

SPC Tracksport for 7" Sierra casing is much bigger than the version for BMW diff CC uses. Titan LSD handles the power OK when working, unfortunately due to a engineering flaw in is very prone to fracture it's Belleville pre load spring and that makes the diff behavior erratic and more prone to slip. 

Size on the inside. Sierra diff is able to handle power outputs than the version of BMW diff CC uses.

Now just make sure the ramp angles are 30/30 and then you can say you have a proper LSD! 

The diff is a good news!! They are good!!

Mark, well done!!! 

They are smooth and run fine, just unable to handle higher powered vehicles. 

Bottom line is not to buy a Caterham with BMW diff. 

Truth to be said, Sierra is a much stronger diff than BMW, and that goes for the SPC as well. 

Way easier!!! 

If the opposite wheel rotates the other way when the car is jacked at the rear the LSD has lost the preload. the Belleville spring has fractured - most likely due to the fact that the Titan LSD is pressing the Belleville spring completely flat when locking under load and when doing this repeatedly introducing metal fatigue and destruction of the spring. Locking with no preload becomes more erratic and leads to increased wear of plates due to slipping. All this is due to the poor design of Titan LSD that the company refuses to rectify. 

Quite easy on CSR - just unbolt the wishbones and tracking arm and pull the whole thing out - beware of the brake line and speedo.

Anyone following the weather forecast? Is it going to rain (again)? Do I need to put some meaningful tyres on? 

The first CSR cars tended to have ATB LSD in (as intended as road cars). The plated LSD usually went in at customer's request. 

It looks that way. The original one came off with ease and without damage. I don't seem to have any loss of boost.