[Askadry]

Originally Posted by Feddersen

Your car has a open diff as others mention. Imagine you have 100% of power that somehow has to leave your engine by sending it to the will and whereever there is the least resistance the power will go. This means if you loose traction with one of the wheels that wheel will just spin (all power) while the other one stands still (no power). However that can somehow be compensated by having a "eLSD". The way that works is by applying brakes to the spinning wheel. Now the power is blocked on the spinning wheel and suddenly the other wheel gets the power and the car moves forward. This method really wears down your rear brakes and also your tires if you like to drive a bit spirited.

A welded diff is the total opposit of an open diff. It locks the possibility of distributing the power. This means that 50% of the power goes to each wheel under any circumstance.

The M Performance LSD has a lock of 30%. This allows the some wheel spin on one wheel but at least 30% of the power goes to the wheel with the most resistance at the same time meaning that the car will move forward at any time.

Then there is the "Active LSD" in M2/M3/M4. That one can adjust is lock levels electronically. It is done internally in the pumpkin with some sort of clutch technology and not by using brakes. I've tried that in a M4 on very narrow roads where I also drive my 335i and must admit that it just works perfectly.

The open diff has the advantage that it always follows a curve perfectly. If you take a very narrow curve and you have full traction the LSD can make the car feel like it rather like to go forward instead of taking the narrow curve. However if you start loosing traction the LSD makes much more fun. The Active LSD in the M cars combines the best of both worlds by locking the distribution perfectly to match the curve and still give the most possible traction.

Sadly there are no options of active LSDs for the F30.

BTW: I have a lot of footage from my driving so if there is a certain situation you'd like to see I might be able to find something.

From a street-drifting-fun-perspective, does the 3K$ worth it for the M Performance LSD?

Or stay with the stock open diff?

The is mu first rear wheel drive car, F30 335i

[Feddersen]

Nice ride :-)

The question is actually simple. Do your wheels often spin when you're driving? If yes, then the extended smile of having a LSD will be worth the money :-)

I tried a M235i with the open diff and "eLSD" with poor tires. I was told to bring it to its (or my) limits and it was jumping from side to side all the time because it constantly applied the brakes on either the left or the right rear wheel. :-(

[Gio72]

Originally Posted by Feddersen

Your car has a open diff as others mention. Imagine you have 100% of power that somehow has to leave your engine by sending it to the will and whereever there is the least resistance the power will go. This means if you loose traction with one of the wheels that wheel will just spin (all power) while the other one stands still (no power). However that can somehow be compensated by having a "eLSD". The way that works is by applying brakes to the spinning wheel. Now the power is blocked on the spinning wheel and suddenly the other wheel gets the power and the car moves forward. This method really wears down your rear brakes and also your tires if you like to drive a bit spirited.

A welded diff is the total opposit of an open diff. It locks the possibility of distributing the power. This means that 50% of the power goes to each wheel under any circumstance.

The M Performance LSD has a lock of 30%. This allows the some wheel spin on one wheel but at least 30% of the power goes to the wheel with the most resistance at the same time meaning that the car will move forward at any time.

Then there is the "Active LSD" in M2/M3/M4. That one can adjust is lock levels electronically. It is done internally in the pumpkin with some sort of clutch technology and not by using brakes. I've tried that in a M4 on very narrow roads where I also drive my 335i and must admit that it just works perfectly.

The open diff has the advantage that it always follows a curve perfectly. If you take a very narrow curve and you have full traction the LSD can make the car feel like it rather like to go forward instead of taking the narrow curve. However if you start loosing traction the LSD makes much more fun. The Active LSD in the M cars combines the best of both worlds by locking the distribution perfectly to match the curve and still give the most possible traction.

Sadly there are no options of active LSDs for the F30.

BTW: I have a lot of footage from my driving so if there is a certain situation you'd like to see I might be able to find something.

I agree everything except on tour explanation of the 30% lockout: it means that the difference in torque between tire with more traction and tire with less traction will be up to 30%. So the wheel with more resistance will recive 65% of torque and on the other 35% will go to the wheel with less traction, not, respectevly 30-70 as you wrote
I'm really satisfied too with my M Performance LSD: the lockout is very fast and this makes the car more nervous (more oversteer in all condition), but really more funny and fast out of the tight corner!

[eluded]

Does a stock 340 or 335 come with LSD?

[F32Fleet]

Originally Posted by eluded

Does a stock 340 or 335 come with LSD?

No. Only M cars get a mechanical LSD.

[Feddersen]

Originally Posted by Gio72

I agree everything except on tour explanation of the 30% lockout: it means that the difference in torque between tire with more traction and tire with less traction will be up to 30%. So the wheel with more resistance will recive 65% of torque and on the other 35% will go to the wheel with less traction, not, respectevly 30-70 as you wrote
I'm really satisfied too with my M Performance LSD: the lockout is very fast and this makes the car more nervous (more oversteer in all condition), but really more funny and fast out of the tight corner!

I stand corrected :-)

I agree that it feels a bit more nervous but the fact that it is predictable makes it easier to handle.

[Gio72]

Originally Posted by Feddersen

I stand corrected :-)

I agree that it feels a bit more nervous but the fact that it is predictable makes it easier to handle.

Absolutely true! It's more "natural" and for me it's a come back to the past: on 1990 I learned to drive with an Alfa 75 1.8 turbo and a Maserati 2.24v both equipped with mechanical LSD!

[Daftasabrush]

Originally Posted by Feddersen

I stand corrected :-)

I agree that it feels a bit more nervous but the fact that it is predictable makes it easier to handle.

Seconded, more nervous, but more fun, and more controllable.

[Polo08816]

Originally Posted by Feddersen

Your car has a open diff as others mention. Imagine you have 100% of power that somehow has to leave your engine by sending it to the will and whereever there is the least resistance the power will go. This means if you loose traction with one of the wheels that wheel will just spin (all power) while the other one stands still (no power). However that can somehow be compensated by having a "eLSD". The way that works is by applying brakes to the spinning wheel. Now the power is blocked on the spinning wheel and suddenly the other wheel gets the power and the car moves forward. This method really wears down your rear brakes and also your tires if you like to drive a bit spirited.

A welded diff is the total opposit of an open diff. It locks the possibility of distributing the power. This means that 50% of the power goes to each wheel under any circumstance.

The M Performance LSD has a lock of 30%. This allows the some wheel spin on one wheel but at least 30% of the power goes to the wheel with the most resistance at the same time meaning that the car will move forward at any time.

Then there is the "Active LSD" in M2/M3/M4. That one can adjust is lock levels electronically. It is done internally in the pumpkin with some sort of clutch technology and not by using brakes. I've tried that in a M4 on very narrow roads where I also drive my 335i and must admit that it just works perfectly.

The open diff has the advantage that it always follows a curve perfectly. If you take a very narrow curve and you have full traction the LSD can make the car feel like it rather like to go forward instead of taking the narrow curve. However if you start loosing traction the LSD makes much more fun. The Active LSD in the M cars combines the best of both worlds by locking the distribution perfectly to match the curve and still give the most possible traction.

Sadly there are no options of active LSDs for the F30.

BTW: I have a lot of footage from my driving so if there is a certain situation you'd like to see I might be able to find something.

Originally Posted by Gio72

I agree everything except on tour explanation of the 30% lockout: it means that the difference in torque between tire with more traction and tire with less traction will be up to 30%. So the wheel with more resistance will recive 65% of torque and on the other 35% will go to the wheel with less traction, not, respectevly 30-70 as you wrote
I'm really satisfied too with my M Performance LSD: the lockout is very fast and this makes the car more nervous (more oversteer in all condition), but really more funny and fast out of the tight corner!

I don't think that's actually correct. Not in the way BMW uses the term. The reason is because the M Performance LSD has a 30% lock on acceleration and a 9% lock on deceleration. The deceleration lock makes the differential perform more like an open differential.

In other words, the lower the %, the closer it is to an open differential. The higher the % the closer it performs to a welded diff.

[R1d3r]

Hello people,

Does anyone know where I can buy Lsd for F30 automatic from Europe?

[n55david]

Originally Posted by R1d3r

Hello people,

Does anyone know where I can bought Lsd for F30 automatic from Europe?

Yeah, you need to find one.

[Bl00DY F30]

Originally Posted by n55david

Yeah, you need to find one.

[R1d3r]

Originally Posted by Bl00DY F30

yeah, really funny

[jv004]

I bought mine when they were selling for 500, so with install it came to 875. For Daily driver with some spirited driving, I say it's not worth the cost. I don't track the car and the only reason it's installed was because it only cost 800 bucks hehe

[jandeman58]

Originally Posted by R1d3r

Hello people,

Does anyone know where I can buy Lsd for F30 automatic from Europe?

Hardeman Motorsport in the Netherlands does OS Giken, better then M Sport. And they know their business.

Have one for years now under my 440I (400+ HP / 600Nm) combined with the Öhlins Road & Track (also mounted by Hardeman).

https://hardemanmotorsport.nl/#

[F32Fleet]

Originally Posted by jandeman58

Hardeman Motorsport in the Netherlands does OS Giken, better then M Sport. And they know their business.

Have one for years now under my 440I (400+ HP / 600Nm) combined with the Öhlins Road & Track (also mounted by Hardeman).

https://hardemanmotorsport.nl/#

OS Giken offers a different experience but I wouldn't call it better as it's more tailored for hardcore track environment.

[Boostedphil698]

Originally Posted by R1d3r

Hello people,

Does anyone know where I can buy Lsd for F30 automatic from Europe?

Birds Auto out of the UK can sell you a built one. They take a stock differential and modify it to how you want.