BMW 335 E90/91/92/93 and 1-st series in particular have a very distinctive and different from the others differential. Here is prepared LSD for 335d, 335iA, 335i. Brand new LSD units are integrated. These are BSS111 for typ215L and BSS102 for typ188L, manufactured by BMW shper studio.
You are free to ask for availability and price.
F01 760i V12 bi-turbo
It is interesting that the N74’s differential is larger than the other F01. A cast iron casing and a longer pinion is a reference to good old times.
This is the same diff of all N74 cars F01/F02 plus Hybrid 7, Alpina B6/B7
This is the same diff of all N74R engines in Rolls Royce Ghost, Rolls Royce Wraith, Rolls Royce Dawn.
Yes. Rolls Royce.
In 2009 the turbocharged N74 replaced the N73 and was used in the new F01 760i. A 6.6 litre version powered Rolls Royce models from 2013 and 6.6 M-Performance engine from a G01 M760i.
I have to introduce three differentials. All three LSDs together completely by chance.
From left to right: E36, E46, E90
First is typ188 BMW E36 LSD S3,73 60%lock
In the middle typ188K BMW E46 LSD S2,93 70%lock
On the right typ215L BMW E92 330d LSD S2,65 40%lock
M14x1.5 Another one delusion
It seems to be a popular fallacy in the north (UK and Scandinavian) that E30 has M14x1,5 on the crown gear bolts. Each typ188 has bolt size M12x1.5.
I have been doing with differentials for years. The only differential type188 with M14x1.5 I’ve ever met is the BMW E36 M3 3.0. Also in the official documentation of BMW is invariably present thread M12x1.5 of gear ring bolt.
This is the first front differential become stronger. It’s from BMW E90 320xd.
The original bearings have been removed. They have been replaced by much more durable tapered roller bearings.
New OEM bearings on the left, comprare to standard tapered roller bearings on the right.
As we know at BMW rear wheels are driven. BMW chose to use LSD friction type produced by ZF. All BMW models until E36, E34, E32 could be produced with the option “LSD”. Over the years, they were installed and other types as Visco LSD, locking type (EH Differential), Torsen… but this was as an exception.
Here I will explain what is the difference between open differential and LSD. Differential character is determined by planetary gear. This mechanism is designed to differential case. Here is an example of open case type and limited slip case.
The main problem of the open diff is the loss of traction. When one drive wheel is in the air or on ice or road surface with different grip, the car loses it mobility and power. Rotates only the wheel which has no traction. Americans call this effect (or defect) “one wheel peel”. Anyone who has driven a car has experienced this defect, even if he did not know that’s is happening. I personally find it very unpleasant. But I’m not impartial. Limited slip differential (LSD) can transmit a certain torque to the wheel that got traction.
This can be done by using friction discs (#9 in the picture), installed in LSD case:
There is a lot of practical advantages when we talk about LSD. At first, the limited slip differential is very useful in poor road conditions such as snow, mud… LSD makes possible different road performances, donuts and having a lot of fun . The fun is guaranteed if you decide to take a turn sideways. As a man who enjoys sports driving and track racing LSD is necessary, and when it comes to motor sports is MUCH needed. This applies not only to drift, but for all track and rally disciplines. In drag racing, for example, the presence of LSD makes the start much better. The things can be almost perfect…
It is possible to make LSD with an higher percentage lock and a different gear ratio, according to the field of application.
The most amazing thing about LSD is the fact that it works completely automatically. Don’t need any human intervention, pressing buttons, etc. As someone says: self-blocking differential. However it requires a little more attention to service. If in the open diff not fundamentally change the oil (Long life), the limited slip differential requires a special oil, which must be changed frequently, depending on how you use the car and what is the main purpose.
