For Sale - 135i 08/09 Stock open diff

[BMW86]

$300 factory open diff

[M3EATERS]

Hi,
Was this off a dct version? What brand is it please?

[vtl]

Looks like the OEM open diff to me, non LSD

[BMW86]

It's the stock e diff from a steptronic

[John_01]

/ LSD

[The Wind Breezes]

That's not an LSD or an e-diff. It's a regular open differential. The car vectors torque with the rear brakes, which have nothing to do with the diff.

[PrematureApex]

Originally Posted by The Wind Breezes

That's not an LSD or an e-diff. It's a regular open differential. The car vectors torque with the rear brakes, which have nothing to do with the diff.

No, you cannot "vector torque" with rear brakes (or anything else) and an open diff. Torque split across an open diff is ALWAYS 50/50, period. Always.

[The Wind Breezes]

Originally Posted by PrematureApex

No, you cannot "vector torque" with rear brakes (or anything else) and an open diff. Torque split across an open diff is ALWAYS 50/50, period. Always.

Hahahaha. What in the hell are you talking about? That's how an open diff works lol, it sends the power to the side of least resistance.

[Kkuba]

Originally Posted by The Wind Breezes

Hahahaha. What in the hell are you talking about? That's how an open diff works lol, it sends the power to the side of least resistance.

Actually, he is correct, it is always 50:50. If one wheel has hardly any traction, it will spin up with (arbitrary) 10Nm of torque that means the other wheel will receive 10Nm as well. Therefore the car will go nowhere.

It's counter intuitive, but that's the physics behind it.

[The Wind Breezes]

Originally Posted by Kkuba

Actually, he is correct, it is always 50:50. If one wheel has hardly any traction, it will spin up with (arbitrary) 10Nm of torque that means the other wheel will receive 10Nm as well. Therefore the car will go nowhere.

It's counter intuitive, but that's the physics behind it.

Read what I wrote lol. I don't see how this could possible be unclear:

Originally Posted by The Wind Breezes

it sends the power to the side of least resistance.

50:50 torque split means each wheel gets 50% of torque. An open diff has a 0:100 torque split as soon as traction is lost. It's not counterintuitive in the slightest. And yes, this is a REGULAR OPEN DIFF--the car uses the rear brakes to slow whichever wheel loses traction. This is hardly theoretical territory, everyone knows the car has an open diff and software to simulate a LSD.

[Kkuba]

Originally Posted by The Wind Breezes

Read what I wrote lol. I don't see how this could possible be unclear:



50:50 torque split means each wheel gets 50% of torque. An open diff has a 0:100 torque split as soon as traction is lost. It's not counterintuitive in the slightest. And yes, this is a REGULAR OPEN DIFF--the car uses the rear brakes to slow whichever wheel loses traction. This is hardly theoretical territory, everyone knows the car has an open diff and software to simulate a LSD.

No, it is 50:50 torque split. All the time.

Do you know how much power (torque) your engine makes when not under load? Bugger all.

When one wheel is on a slippery surface the engine will have hardly any load against it, so the engine might only make 30Nm. With an open diff, 15Nm will go to the wheel with no traction, and 15Nm will go to the wheel with traction. If you open the throttle more, the engine might rev up, but it won't actually produce more torque. so you will only always get the same amount of torque to the wheel with traction.

I am not disputing what the 135i has (open diff, brakes to simulate LSD). I am saying that ALL open diff have a permanent 50:50 torque split.

I hope this helps you understand:

https://www.youtube.com/watch?v=_HOa0aRZYpw