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2Addicts | BMW 2-Series forum Technical Topics B58 (M240i) Engine, Transmission, Exhaust, Tuning LSD for 18 M240i

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      07-13-2018, 02:32 PM   #1
Jerich0
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LSD for 18 M240i

Hello guys...

I am looking to add an LSD to the 18’ M240i... which one do you recommend and is the difference worth it?

Thanks!
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      07-13-2018, 04:53 PM   #2
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Mine m240i will be deliverd this month with the M Performance LSD
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      07-13-2018, 06:05 PM   #3
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Quote:
Originally Posted by dannyvdberg View Post
Mine m240i will be deliverd this month with the M Performance LSD
I was told that the LSD isn't a installed at the dock option for the 2 series.
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      07-13-2018, 09:43 PM   #4
Jerich0
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Thanks guys but what is there to buy right now?
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      07-14-2018, 12:11 PM   #5
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Checkout Diffsonline. They give you options to configure the diff the way you want. I went with a Wavetrac and have been very happy with it. You can also elect to drop the final drive ratio if you are so inclined. Once you install the LSD you send them your stock unit in exchange for a core deposit. Really simple. Also, Turner Motorsport offers a similar service.

Edit: Checkout this post. Recommendations from a bunch of folks.

https://www.2addicts.com/forums/show....php?t=1390045
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Last edited by RotorOver; 07-14-2018 at 12:17 PM.
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      07-17-2018, 11:22 PM   #6
Jerich0
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Quote:
Originally Posted by RotorOver View Post
Checkout Diffsonline. They give you options to configure the diff the way you want. I went with a Wavetrac and have been very happy with it. You can also elect to drop the final drive ratio if you are so inclined. Once you install the LSD you send them your stock unit in exchange for a core deposit. Really simple. Also, Turner Motorsport offers a similar service.

Edit: Checkout this post. Recommendations from a bunch of folks.

https://www.2addicts.com/forums/show....php?t=1390045
Thank you!
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      08-13-2018, 03:42 PM   #7
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Guys, for the B58 engines I heard there was some coding to be done when installing the M Diff... does anyone know what should be coded since I am doing it in my friends shop.
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      08-13-2018, 05:40 PM   #8
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Quote:
Originally Posted by Jerich0 View Post
Guys, for the B58 engines I heard there was some coding to be done when installing the M Diff... does anyone know what should be coded since I am doing it in my friends shop.
There is no coding required for the MP LSD.
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      08-13-2018, 06:13 PM   #9
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Quote:
Originally Posted by PeterWT View Post
There is no coding required for the MP LSD.
OK thanks!... how did you like your LSD? You think its word it for a street driven car?
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      08-13-2018, 07:30 PM   #10
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Quote:
Originally Posted by Jerich0 View Post
OK thanks!... how did you like your LSD? You think its word it for a street driven car?
Love it and I don't track my car. The car should come with it from the factory.
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      08-15-2018, 12:42 PM   #11
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Agreed - anything with an M designation - be it M lite (M240i/M235i) or the full M (M2/M3/M4/M5 etc.) should come with LSD standard. Bmw could differentiate between M lite and full M with a mechanical diff and M-diff which can vary lockup and slip electronically.

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Love it and I don't track my car. The car should come with it from the factory.
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      08-15-2018, 07:38 PM   #12
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Quote:
Originally Posted by RotorOver View Post
Checkout Diffsonline. They give you options to configure the diff the way you want. I went with a Wavetrac and have been very happy with it.
Same here...diffsonline...Wavetrac...it works as advertised.

Dan has built clutch-based diffs for my track and race cars, and I recommend diffsonline highly. For sure check them out.

The helical gear-based Wavetrac that Dan built for me has made a big difference in my M240i, and I'm looking forward to what it can do for me at Mid-Ohio's handling track this weekend.
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      08-16-2018, 09:45 AM   #13
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Quote:
Originally Posted by dradernh View Post
Same here...diffsonline...Wavetrac...it works as advertised.

Dan has built clutch-based diffs for my track and race cars, and I recommend diffsonline highly. For sure check them out.

The helical gear-based Wavetrac that Dan built for me has made a big difference in my M240i, and I'm looking forward to what it can do for me at Mid-Ohio's handling track this weekend.
As someone not in the know as someone like yourself, can you explain the real difference between something like the Wavetrac and the M LSD? Of course, price for one, but what is real world for someone who will not track often but just wants to put the power to the ground a little better (in a 6spd).

Also, I know if I get the BMW M LSD in there my warranty is still fine. What about with a Wavetrac or similar? Obviously the diff wouldn't be covered by BMW but would it be likely for BMW to deny ANY drivetrain warranty claim if using a non BMW diff?

Thx
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      08-20-2018, 05:16 PM   #14
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Can someone explain the real world everyday advantages of having the LSD. I know what it is and how it works but for daily driving and weekend canyon runs what will it do to my drive? Will I be able to tell its even there? Is it more of a track thing? Its a pricey add on and wanna get some opinions.Thanks
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      08-20-2018, 05:45 PM   #15
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Quote:
Originally Posted by mike519 View Post
As someone not in the know as someone like yourself, can you explain the real difference between something like the Wavetrac and the M LSD? Of course, price for one, but what is real world for someone who will not track often but just wants to put the power to the ground a little better (in a 6spd).

Also, I know if I get the BMW M LSD in there my warranty is still fine. What about with a Wavetrac or similar? Obviously the diff wouldn't be covered by BMW but would it be likely for BMW to deny ANY drivetrain warranty claim if using a non BMW diff?

Thx
Quote:
Originally Posted by BallHog5873 View Post
Can someone explain the real world everyday advantages of having the LSD. I know what it is and how it works but for daily driving and weekend canyon runs what will it do to my drive? Will I be able to tell its even there? Is it more of a track thing? Its a pricey add on and wanna get some opinions.Thanks
First, I'm no expert when it comes to diffs. As I say to my wife: if I watch an internet animation of how a particular type of limited slip diff works...well, five minutes later I can't really explain how it works, even to myself! I just think of them as black boxes.

However, I do know this - your car will do a significantly better job of putting the power down to both wheels with a limited slip diff. Where it's made a difference for me is coming out of corners, whether it's on a back road or exiting the Bus Stop at Watkins Glen. The car simply hooks up and goes. If you have a favorite corner where you're getting the most out of the car on exit, you will notice the difference after you install a LSD. Whether the cost and other issues are worth it is up to each driver.

I got the Wavetrac based upon Dan's advice. I told him it was going into a street car that would see two or three track events each year, and he said the Wavetrac was the one to get. I assume if I'd told him it was for a race car that he would again have advised a clutch-based unit, but that's just an assumption.

From my point of view, the advantage of the Wavetrac is that it doesn't require periodic rebuilds. I don't know the rebuild interval for the BMW clutch-based LSD, but I'm assuming the clutches do eventually need to be replaced. All of my clutch-based track/race LSDs eventually needed to be rebuilt; of course, they were seeing much more intense use than they would if they had been installed in a street car.

As far as the OEM warranty goes, I don't really know what the situation is. Beyond possible issues with halfshafts (axles), I'm not sure what BMW could say a non-OEM diff did that caused damage to other parts of the car. I'm not suggesting that it's not an issue, but my guess is that a properly installed non-OEM diff is unlikely to result in a legitimately denied warranty claim when that claim is otherwise valid.
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      10-11-2018, 09:06 AM   #16
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I pulled the trigger on the Wavetrac in 3.08, it's a bit pricey but I've been a good boy :-) With new bearings $600, a core charge of $600 it worked out to $3,400 so minus the core it's more like $2800 but you'll spend $500 to get it installed.
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      10-12-2018, 08:24 PM   #17
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Quote:
Originally Posted by rickd View Post
I pulled the trigger on the Wavetrac in 3.08, it's a bit pricey but I've been a good boy :-) With new bearings $600, a core charge of $600 it worked out to $3,400 so minus the core it's more like $2800 but you'll spend $500 to get it installed.
You won’t regret it brother!
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