[Bmwhead]

Hello everybody.

I recently bought a M240i MY19 AUT8 and the first modification that he wanted to make is to install an LSD differential because the previous owner told me that it does not have it incorporated, after analyzing the Quaife options and the original BMW M Performance I have gone to An official BMW workshop to ask for a quote on its installation, my surprise was when they told me that they could not install it because I have it mounted originally, all AUT8 have LSD differential and 6MT come with open differential and for them they do there is the option of retrofitting an LSD. I have consulted in Realoem and he agrees, for cars with automatic transmission only the M Performance LSD 33108659989 is available and with manual transmission the open differential 33107599411, existing for the 6MT the option of the M Performance LSD 33108659987. It has been very strange to me and I have consulted On the phone at another official BMW workshop and they have given me exactly the same information, have we been deceived all this time? Why don't they advertise that this series element is incorporated? Perhaps because of the controversy of the proximity in benefits to the M2 N55?

[Nickies]

Originally Posted by Bmwhead

Hello everybody.

I recently bought a M240i MY19 AUT8 and the first modification that he wanted to make is to install an LSD differential because the previous owner told me that it does not have it incorporated, after analyzing the Quaife options and the original BMW M Performance I have gone to An official BMW workshop to ask for a quote on its installation, my surprise was when they told me that they could not install it because I have it mounted originally, all AUT8 have LSD differential and 6MT come with open differential and for them they do there is the option of retrofitting an LSD. I have consulted in Realoem and he agrees, for cars with automatic transmission only the M Performance LSD 33108659989 is available and with manual transmission the open differential 33107599411, existing for the 6MT the option of the M Performance LSD 33108659987. It has been very strange to me and I have consulted On the phone at another official BMW workshop and they have given me exactly the same information, have we been deceived all this time? Why don't they advertise that this series element is incorporated? Perhaps because of the controversy of the proximity in benefits to the M2 N55?

This is very interesting........

Hope some gurus will chime in. I remember reviewers of the Auto8 model saying that the $3.5K option was highly recommended.

[pikcachu]

https://www.realoem.com/bmw/enUS/sho...diagId=33_1620

shows you have the option for the LSD
https://www.realoem.com/bmw/enUS/par...&q=33108659989

or the open one
https://www.realoem.com/bmw/enUS/par...&q=33107599411

[spidy512]

Thanks pikachu.

I read it the same way. The LSD is optional, as it shares the "#1" line item for the diff assembly.

Bmwhead, have you confirmed the part number that is on the car?

josh

[Nickies]

Originally Posted by spidy512

Thanks pikachu.

I read it the same way. The LSD is optional, as it shares the "#1" line item for the diff assembly.

Bmwhead, have you confirmed the part number that is on the car?

josh

Go with your serial number. Mine has RWD and has the MP LSD confirmed.

I am wondering if it is limited to RWD models.

[spidy512]

iIt must be limited.

My m240ix has partnum = 33108485723

More likely the same open diff but with a different gear ratio?

josh

[dradernh]

Originally Posted by Nickies

Go with your serial number. Mine has RWD and has the MP LSD confirmed.

Are you saying that your RWD M240i came from the factory with the MP LSD installed?

[Nickies]

Originally Posted by dradernh

Are you saying that your RWD M240i came from the factory with the MP LSD installed?

Yes it did.

[Bmwhead]

pikachu I think the one you indicate is for 6MT, speaking only of M240i LCI RWD we have three versions

2J51 EUR specifications
2J52 USA specifications
2J53 EUR RHD specifications

And in the three options you can mount 6MT or AUT8, in the first the final development is 3.08 and in the second 2.81, according to Realoem the differential for 3.08 development is 33107599411 (open) and for 2.81 it would be 33108659989 (LSD), later as an option We would have the 33108659987 differential (LSD with 3.08 development for 6MT) which is an option that is mounted afterwards, it cannot be fitted at the factory or as an option.

Completing the information and to avoid confusion I find that only the M240i AUT8 RWD OG with EUR specifications (LHD and RHD) that have code 2G11 and 2G13 can come with an open rear differential 33107603760, but with USA specifications (code 2G13) it is always LSD. LSD is also not available for M240iX.

I also think it is interesting to comment that the M235i has the same final development (3.08) in 6MT and AUT8, for this there is only open differential in 6MT and open or LSD in AUT8.

Once I have analyzed all this, I am very surprised, also looking for information in the forum I have been able to confirm that all the users who tell about their experience of installing the LSD differential are always 6MT.

[dradernh]

Originally Posted by Nickies

Yes it did.

How were you able to determine this?

[spidy512]

Its too bad the ix didn't get one as well. But makes sense why they didn't put on in.

Pretty cool if we continue to see this on others cars. Great find Bmwhead!

Can someone remind me what the final drive ratio is for a ix auto? Curious if you could find a used "auto LSD" from a RWD that would work in the ix. But, if I remember correctly the final drive is different.


thanks!
josh

[aerobod]

Originally Posted by Bmwhead

.... have code 2G11 and 2G13 can come with an open rear differential 33107603760, but with USA specifications (code 2G13) it is always LSD.

2G13 in North America does not always come with an LSD. LSD is/was a port installed option when available, not linked to the 2G13 manufacture code. I think you will find the majority of 2G13 cars will not have an LSD.

[FancyDan]

I am very, very interested in this as I recently installed the LSD on my RWD Auto M240i. I still have the original unit as I haven't been able to sell it (this may turn out to be a blessing in disguise).

How can I tell if the unit is the M performance LSD? Visually, it looks the same as the pictures I find online. It has a sticker with a barcode and some kind of serial number, but it isn't the part number (33108659989).

[XutvJet]

In the US, no M235s or M240s came with LSDs as standard equipment. It was either port installed as part of the customer order or installed after delivery.

A simple test to determine if you have the LSD or not is to jack up the car by the differential and spin a wheel. If the opposite wheel spins in the same direction, then you have the LSD. If it spins backwards, then you have an open differential.

[Bmwhead]

Originally Posted by spidy512

Its too bad the ix didn't get one as well. But makes sense why they didn't put on in.

Pretty cool if we continue to see this on others cars. Great find Bmwhead!

Can someone remind me what the final drive ratio is for a ix auto? Curious if you could find a used "auto LSD" from a RWD that would work in the ix. But, if I remember correctly the final drive is different.


thanks!
josh

The differential of the M240iX has the same relationship as the RWD (2.81) but it is different and its reference number does not match, I do not know if it is possible in some way to adapt an LSD.

Originally Posted by FancyDan

I am very, very interested in this as I recently installed the LSD on my RWD Auto M240i. I still have the original unit as I haven't been able to sell it (this may turn out to be a blessing in disguise).

How can I tell if the unit is the M performance LSD? Visually, it looks the same as the pictures I find online. It has a sticker with a barcode and some kind of serial number, but it isn't the part number (33108659989).

Outwardly it is difficult to detect since they may have different numbers printed on the outer casing, the test of lifting the wheels and turning is good but I do not know if it will be valid in the M Performance because of its clutch system. You can also see the sticker with the exact reference of the part above the differential and to see it you have to have it disassembled or access it with the car raised. I think the unequivocal way is to do like Nickies and I call an official BMW point and tell us the part we have with the VIN number.

[dradernh]

Originally Posted by XutvJet

A simple test to determine if you have the LSD or not is to jack up the car by the differential and spin a wheel. If the opposite wheel spins in the same direction, then you have the LSD. If it spins backwards, then you have an open differential.

^ This.

[Bmwhead]

It is possible that the discussion is more complicated than it seems, on the one hand we are already two users to whom BMW has confirmed that we have it, in addition Realoem offers information that can be considered very reliable. What is very strange is that BMW has not publicized the incorporation of this element since that would have made it win many sales, just as it is not understood that they incorporate it with an automatic box and not with a manual box. It would be very interesting if the owners could call a BMW workshop with their VIN number so that they will inform them of what exactly they have mounted and thus all be able to obtain information that clarifies this discussion.

[FancyDan]

Sorry if it wasn't clear, but I meant how can I tell if the factory differential that is not mounted on the car anymore is an LSD or not? I changed the factory unit with the M performance version and have the original one boxed up. The dealer that did the work did not mention that I am replacing the factory unit with the same one.

I called two separate dealerships and they both told me that the only part in their system for a diff on a RWD Auto M240i is the M performance unit, and thus the car had to have been shipped that way from the factory. They also said that only the factory could decode the serial number that's on the factory unit.

[PurpleFunkMan]

Hi All. There is no way the MPerformance LSD came standard.
All M235i and M240i came stock with an "open" electronic diff. which is totally different than the mechanical clutch type the MPerformance is.


I had my MPerformance LSD dealer installed a few days after i bought the car.
And BTW, it is NIGHT and DAY difference!)
I have a 2019 M240i Auto RWD
Part #33108659989 for automatic transmission.

Hope this helps.

[Bmwhead]

Originally Posted by FancyDan

Sorry if it wasn't clear, but I meant how can I tell if the factory differential that is not mounted on the car anymore is an LSD or not? I changed the factory unit with the M performance version and have the original one boxed up. The dealer that did the work did not mention that I am replacing the factory unit with the same one.

I called two separate dealerships and they both told me that the only part in their system for a diff on a RWD Auto M240i is the M performance unit, and thus the car had to have been shipped that way from the factory. They also said that only the factory could decode the serial number that's on the factory unit.

Once disassembled you will see that at the top there is a white sticker, there you have to have a series of numbers among which is the reference of the piece.



At this point there will be people who think that it is included and there will be people who think that it is not, for those who think that it comes standard with open differential I ask them:

- If in Realoem all the stock parts of the car appear, why is there not an open differential for the RWD AUT8? Only exists for the M235i

- We are already two people who have contacted an official BMW workshop and they have told us that we cannot install the LSD differential because we already have it, I called a third place today insisting more on the question and they have given me the same information, they say that the data is obtained directly from a database in Germany by entering the VIN.

And my doubt for those of us who are more inclined to the option that it comes with incorporated LSD:

- Why doesn't this feature appear anywhere?

- It seems that there are people with a RWD AUT8 who have assembled it (although it was not in an official BMW workshop), have they installed one just like the one that already existed?

[FancyDan]

The sticker on the factory diff says 7603759-04/EA5764;2.81 with two barcodes underneath and a serial number that only the factory can decode.

Looking up just 7603759 in RealOEM suggests that this diff was on the 3 series GT. My guess is that it was also used on the F30 and F32.

But it really begs the question as to why RealOEM and even BMW themselves only have the M performance option as a part for the RWD Auto. Does that mean if you had to change the factory diff for whatever reason your only option is the LSD?

[Bmwhead]

Originally Posted by FancyDan

The sticker on the factory diff says 7603759-04/EA5764;2.81 with two barcodes underneath and a serial number that only the factory can decode.

Looking up just 7603759 in RealOEM suggests that this diff was on the 3 series GT. My guess is that it was also used on the F30 and F32.

But it really begs the question as to why RealOEM and even BMW themselves only have the M performance option as a part for the RWD Auto. Does that mean if you had to change the factory diff for whatever reason your only option is the LSD?

What you are saying seems to me to be very important information because it is objective data and there is no room for doubt, an open differential was fitted at the factory with the same final ratio but which does not officially exist for the M240i, so as you say yes If you had to change it yourself or if you had to change it, BMW under warranty would give you LSD because it is theoretically the only one that exists and with which our cars are supposed to come, although with so much information I don't even know what to think because it seems silly to stop BMW I have mounted a differential that may not have.