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      03-21-2014, 01:42 PM   #23
jannisa
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Quote:
Originally Posted by nicknaz View Post
GREAT post.
You 'll make me blush, Nick.
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      03-21-2014, 01:55 PM   #24
Brian_VACsales
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Oh, I know the F10 and new M4/3 have the fancy new electronic diff - pretty wild stuff. They are on another level and not even worth discussing with E89, E9X as that does not carry over.


Quote:
Originally Posted by Asbjorn View Post
They used to be mechanical, but now they are electronic, read more here:

http://www.bmw.com/com/en/newvehicle..._catalogue.pdf

Quote: "How does the Active M Differential work? It adjusts electronically and in advance. The previous system only locked with wheel spin on the rear axle. Now we can steer the lock proactively. An electronic control unit links the active system and DSC. If the accelerator is engaged and the sensors anticipate wheel spin, locking torque is applied to the differential. This prevents wheel spin, power is optimally transferred to the tarmac and the driving situation is dynamically controlled."

The diff in N54 cars are all mechanical, also the one in the 1-series M coupe.

Quote: "The BMW 1 Series M Coupe is fitted as standard with a variable M differential lock. This generates lock-up torque as required and completely variably up to 100%, thus providing for optimum traction on all road surfaces. The variable M differential lock responds to differences in rotational speeds in the right and left rear wheel, redirecting drive torque within a fraction of a second. So where there are significant differences in friction coefficients between the right and left rear wheel, for example, optimum traction and maximum propulsion power are ensured. The principle of the engine-speed-sensing M differential lock supports the dynamic qualities of rear-wheel drive both on slippery surfaces and when accelerating out of bends."

The e-diff you refer to is a DSC sub-function which according to speculation is only active in DSC=off mode (ie not in DTC mode), and only on cars fitted with open non-variable differentials. According to speculation it is configured more aggressively on the Z4 compared to N54 3-series cars.

In any case, it prevents the situation where only one wheel keeps spinning, although the diff is open. The upside is price, also on maintenance, and the downside is that the system does not react instantly as with the variable locking mechanical diffs, or proactively as is possible with the electronic locking diffs.
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      10-10-2014, 05:30 PM   #25
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Anyone pull the trigger? interested in review before and after. I'm still thinking of going for it.
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      10-11-2014, 09:35 PM   #26
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I have a VAC built quaife in my Z4. Still spin up both wheels just as easy, most notable when on a track day with extra traction out of the corner.
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      10-11-2014, 11:37 PM   #27
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I'm thinking of going with a WaveTrac LSD when funds allow.
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      10-21-2014, 02:28 PM   #28
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If there was a way to get this on my Z in SoCal I would be game for it.
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2011 35is Stock but for how long?
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      10-22-2014, 03:34 AM   #29
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Quote:
Originally Posted by TheFoz View Post
If there was a way to get this on my Z in SoCal I would be game for it.
Contact Harold @ HPAutowerks, great guy.
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