[pcockley]

Firstly let me say I have posted this on another forum, so I am sorry if you are reading this twice, but I thought seems there are far more 335's in NA than down under you chaps might be better informed..

I am looking for an LSD, but as I have the DCT gearbox (welded) I am looking at a very expensive option to get a Quaife LSD.

This has led me to wonder if i could buy an M3 DCT final drive unit and simply bolt it up without modification?

I guess if this is possible the next Q would be whats the cost of an M3 final drive unit?????

[tibra1]

I dont think it will fit..driveshaft sizes and bolt pattern/sizes are almost certainly different between the m3 and the 335i and especially between DCT and normal tranny ..even if it would fit..you are looking at close to $3K for the m3 DCT final drive unit

[vasillalov]

I would suggest that you do a little more research on LSD's in general. While Quaife is a good differential, it is a torque sensing unit. Two issues with it:

1. It requires that both wheels have some sort of friction in order for it to lock. If one of the wheels lifts or is on a very slippery surface, the Quaife will not lock and act as an open differential.

2. The Quaife requires torque to be transmitted via the driveshaft in order to lock. This is fine for the times you want to be accelerating. However, under deceleration, it will behave as an open diff.

Look into other differentials. Clutch-type and clutch-pack differentials (the M3 diff is a clutch type) are better at providing and managing the lock between the wheels. They do require a bit more maintenance and attention though.

I will be going with OS Giken SuperLock differential next season. It is clutch type differential but unlike the competitors it has 28 plates which makes it very very durable. Most other clutch type differentials have 7-10 plates at the most and they wear out quicker.

[pcockley]

Originally Posted by vasillalov

I would suggest that you do a little more research on LSD's in general. While Quaife is a good differential, it is a torque sensing unit. Two issues with it:

1. It requires that both wheels have some sort of friction in order for it to lock. If one of the wheels lifts or is on a very slippery surface, the Quaife will not lock and act as an open differential.

2. The Quaife requires torque to be transmitted via the driveshaft in order to lock. This is fine for the times you want to be accelerating. However, under deceleration, it will behave as an open diff.

Look into other differentials. Clutch-type and clutch-pack differentials (the M3 diff is a clutch type) are better at providing and managing the lock between the wheels. They do require a bit more maintenance and attention though.

I will be going with OS Giken SuperLock differential next season. It is clutch type differential but unlike the competitors it has 28 plates which makes it very very durable. Most other clutch type differentials have 7-10 plates at the most and they wear out quicker.

Thanks for the feedback! I have looked and looked and as far as I can tell the only diff I can get is the Quaife as I have an 09 with DCT

[tibra1]

Originally Posted by vasillalov

Look into other differentials. Clutch-type and clutch-pack differentials (the M3 diff is a clutch type) are better at providing and managing the lock between the wheels. They do require a bit more maintenance and attention though.

I will be going with OS Giken SuperLock differential next season. It is clutch type differential but unlike the competitors it has 28 plates which makes it very very durable. Most other clutch type differentials have 7-10 plates at the most and they wear out quicker.

^This... I got the OS Giken..but the TCD not the Superlock..TCD has machined oil grooves and holes on all the clutch plates ..makes for silky smooth operation..its a beast of an LSD..100% full lock on accel and 50% lock up on decel

[pcockley]

Originally Posted by Motion

That sounds like a question for Harold @ HP.

I almost bought a Quaife from him for my E36 M3 to replace the worn out stock unit, but end up just have him built me a 40% lock using the stock unit.

Yes I have been talking to Harold (I dont think he sleeps) quite a lot and have a few things on order awaiting delivery. Sadly he confirmed the only option I have is the Quaife and because i live down under I am looking at around 5K for a new diff...... I have decided for the time being i will settle for some sticky tyres and see how they hold up (thus far I am having no traction issues)

[Renus]

I am so expecting to see the LSD from OS Giken for welded drive's DCT 335i ^^, and by the way, will this LSD come with M3 gearset or itself's gearset? any news?

Originally Posted by vasillalov

I would suggest that you do a little more research on LSD's in general. While Quaife is a good differential, it is a torque sensing unit. Two issues with it:

1. It requires that both wheels have some sort of friction in order for it to lock. If one of the wheels lifts or is on a very slippery surface, the Quaife will not lock and act as an open differential.

2. The Quaife requires torque to be transmitted via the driveshaft in order to lock. This is fine for the times you want to be accelerating. However, under deceleration, it will behave as an open diff.

Look into other differentials. Clutch-type and clutch-pack differentials (the M3 diff is a clutch type) are better at providing and managing the lock between the wheels. They do require a bit more maintenance and attention though.

I will be going with OS Giken SuperLock differential next season. It is clutch type differential but unlike the competitors it has 28 plates which makes it very very durable. Most other clutch type differentials have 7-10 plates at the most and they wear out quicker.

[HP Autosport]

Originally Posted by pcockley

Firstly let me say I have posted this on another forum, so I am sorry if you are reading this twice, but I thought seems there are far more 335's in NA than down under you chaps might be better informed..

I am looking for an LSD, but as I have the DCT gearbox (welded) I am looking at a very expensive option to get a Quaife LSD.

This has led me to wonder if i could buy an M3 DCT final drive unit and simply bolt it up without modification?

I guess if this is possible the next Q would be whats the cost of an M3 final drive unit?????

M3 DCT final drive will cost you more as you will need the M3 drive shaft as well and the gear ratio is way off.