[Dylan86]

Originally Posted by WolfGTI

Understood - I usually ride in sport with for chassis - I keep the driveline comfort, if I could get rid of the burbles I would be in DSC off mode all the time - burbles are loud with a DP and cat back.

I like the TC for rain and wintry weather.

Yea I hear ya on the pops/burbles and I don't even have a flash tune (just catless DP/IC/Intake etc) and it's a bit obnoxious. I've learned to modulate the throttle in a way to mostly mitigate the racket, but sometimes I also induce it to tease other tuners lol

[WolfGTI]

Upside will be after I do my suspension refresh in spring - no more EDC - so I'll have the permanent firm ride and handling!

Originally Posted by Dylan86

Yea I hear ya on the pops/burbles and I don't even have a flash tune (just catless DP/IC/Intake etc) and it's a bit obnoxious. I've learned to modulate the throttle in a way to mostly mitigate the racket, but sometimes I also induce it to tease other tuners lol

[Dylan86]

Originally Posted by WolfGTI

Upside will be after I do my suspension refresh in spring - no more EDC - so I'll have the permanent firm ride and handling!

That will be a game changer for sure. Any bushings getting done in the back? Well worth it, imo! Namely diff bushings, rear subframe and rear LCA outer bushings

[WolfGTI]

PowerFlex rear subframe bushings - black series
Delrin differential mounts,
Turner Monoball thrust arms,
F80 lower control arms
Ohlins coilovers.
Ohlins EDC delete module
Super Pro rear LCA bushings

Already have the GC camber plates installed.

Big heap on the shelf in the basement - can't wait for spring!!

Originally Posted by Dylan86

That will be a game changer for sure. Any bushings getting done in the back? Well worth it, imo! Namely diff bushings, rear subframe and rear LCA outer bushings

[Dylan86]

Originally Posted by WolfGTI

PowerFlex rear subframe bushings - black series
Delrin differential mounts,
Turner Monoball thrust arms,
F80 lower control arms
Ohlins coilovers.
Ohlins EDC delete module
Super Pro rear LCA bushings

Already have the GC camber plates installed.

You, my friend, are going to have more "M" feel in the car, than most M cars lol. Pretty much my setup aside from Black Series mine are the blue/purple and the difference in coilovers. Can't wait to hear your before/after on the transformation. I know you will love it!

[WolfGTI]

Hoping so - car has enough power for DD / occasional track use. The focus is on handling now. When I come up to the 416/905 with the car - I'll have to let you know. My brother lives in Caledon.

Originally Posted by Dylan86

You, my friend, are going to have more "M" feel in the car, than most M cars lol. Pretty much my setup aside from Black Series mine are the blue/purple and the difference in coilovers. Can't wait to hear your before/after on the transformation. I know you will love it!

[Dylan86]

Originally Posted by WolfGTI

Hoping so - car has enough power for DD / occasional track use. The focus is on handling now. When I come up to the 416/905 with the car - I'll have to let you know. My brother lives in Caledon.

With the 3-way CS's I have the car getting what feels like 100% of the power to the ground, pure mechanical grip, it's awesome on track as I can push full out with DSC off in full confidence. Never could accomplish this with the factory struts/bushings etc etc. I have a video I posted in one of the FB groups showing some of the cars leg stretching ability. Tracked down and was consistently faster than a prepped Lotus Exige with an experienced driver. Faster than the M2C that was there, faster than a lot of things aside from a gutted RX7 racecar lol who was only .8 faster. I lapped the identical time as my buddies fully prepped/downforce Z3M with about 600whp. Goes to show power means very little. I am finally biting the bullet on BM3 this year, and only because I have the suspension dialed in to a point where the added power is welcomed. The JB4 gives decent power, but not flash tune power...

[Aaron@Autosource]

Up until this weekend I've always been content with the M240i's overall performance in stock form.
However, after running Streets of Willow this weekend, I can say that more than anything, the car desperately needs an LSD.

[glen711]

I'm a little mystified. Recently bought a 2017 m240i RWD, auto, convertible and have been reading a lot here. Love the power but do find that the rear end can step out quite easily. I read about installing the LSD. I considered it and stopped at my local BMW dealer today to check out pricing etc. I was informed by both the service department and the parts department that it being an 'M' version that the car already has an LSD as part of the M designation. What gives? Am I missing something? Is it possible both departments at BMW are mistaken? He showed me the parts breakdown while I was there. Anyone?

[msej449]

Originally Posted by glen711

I was informed by both the service department and the parts department that it being an 'M' version that the car already has an LSD as part of the M designation.

The standard M235i ex-factory did not have an LSD fitted as far as I can see from postings over the last 4 years on this and other forums. In the UK it definitively never had an LSD fitted ex-factory.

In the USA, you could get the LSD retro-fitted on arrival, before local delivery, replacing the original differential.

In all other cases and geographies, the only way to get an LSD retro-fitted was at the dealers, where you could retain the original differential if you wanted.

I don't know what parts list they showed you. I suppose it's possible it was the list for a US-type model where the LSD was fitted on arrival before local delivery.

I'm happy to be corrected, however ...

[gosi]

I am also sure that no M235/M240 has an LSD fitted as standard. Go back to them and ask them to put the car on a lift and spin one tire by hand and see if both tires rotate in the same direction

[RvR]

Originally Posted by glen711

Love the power but do find that the rear end can step out quite easily. I read about installing the LSD. I considered it and stopped at my local BMW dealer today to check out pricing etc. I was informed by both the service department and the parts department that it being an 'M' version that the car already has an LSD as part of the M designation. [...] Is it possible both departments at BMW are mistaken? He showed me the parts breakdown while I was there. Anyone?

As msej449 points out, the M Performance cars, such as your M240i, do not come with an LSD. Not only that, it couldn't be ordered factory installed (grr), either the U.S. BMW port prep or a dealer had to do it for an extra charge ($3,500 in my case, argh, but well-worth it.)

Now the M2 and M2CS have LSDs standard, apparently your dealership is confusing your car with them?

The fact you think your rear can step out too easily tells me you do not have an LSD. The difference in the car is remarkable, without vs. with.

Do the test gosi suggests, it'll prove it one way or the other.

See this Chris Harris video about at the 7:25 mark, where he gets the M Performance LSD installed (money mentioned is in UK pounds):

[dradernh]

Originally Posted by msej449

In all other cases and geographies, the only way to get an LSD retro-fitted was at the dealers, where you could retain the original differential if you wanted.

Here in the States, an owner doesn't need to go to the dealer to have an LSD installed. There are plenty of garages capable of installing a differential. That's true whether an owner buys the BMW LSD or an aftermarket LSD.

[msej449]

Originally Posted by dradernh

Here in the States, an owner doesn't need to go to the dealer to have an LSD installed. There are plenty of garages capable of installing a differential. That's true whether an owner buys the BMW LSD or an aftermarket LSD.

I meant this in the context of the OP being shown a BMW vehicle specification by a dealer which included an M Performance LSD e.g. if you went to my dealer, the registered vehicle's spec' in their service database would include the M Performance LSD that they supplied and retro-fitted.

As you say, if you took delivery of a standard, ex-factory M235i you could also get an M Performance LSD fitted by an independent, or a 3rd-party LSD fitted by an independent. In these cases, though, I don't think that the BMW Dealer's Service details for the car would say that it had an LSD.

So Glen711 that's why there's some confusion in the responses. We're 99.9999% sure no M235i/M240i has ever left the factory with an M Performance LSD fitted. If you've been shown the BMW internal service record specifically for your VIN and it includes one, then it must have been retro-fitted: either as a 'Port Prep' option before delivery to your dealer, or by a dealer as a retro-fit.

If it's a generic ex-factory parts list for a 2 Series and includes an LSD, then what you're being shown is an M2 or M2 CS spec', not an M235i/M240i spec'.

Unfortunately, the only truly definitive way to be absolutely sure it's a standard differential (or not) is to check the part number label. And problemaically, this is stuck to the upper side of the differential (opposite the tarmac side). People have reported being able to manoeuvre their mobile phone into the space between the top of the diff' and the bodywork, to photograph it or use a mirror. Here is my original standard diff' after being replaced:



In effect, this is the view looking down on it if you could see through the trunk floor. And here's my standard diff part number:



but the diff' part number isn't the same through various years and variants, so you need to get it checked by the Service Dept.

[cristo]

For the M240i models, it looks like
the regular diff is 33107603760 auto
and 33107599411 manual, and the
LSD M versions that fit them are
33108659989 auto and 33108659987
manual.

[cooolone2]

So aside from the differential itself, what else is required for the "retrofit?". Very interesting, and was not aware the LSD was available for the AWD version ... I would have definitely done this, lol.

[msej449]

From my reading of the threads on this, there's also a special BMW tool used by them to separate the half-shafts. People have reported being able to do without the special tool: it depends a lot on your skill as a mechanic as far as I can see. TO my eyes, the whole process looks quite challenging. But that depends on your skill as a mechanic, of course. Plus, as with a lot of jobs, it's much easier if you have a proper car lift. I was happy to pay dealer premium to get the job done by them and a BMW Certified option (UK insurers are very fussy about modifications that aren't manufacturer-certified).

[aerobod]

Originally Posted by msej449

From my reading of the threads on this, there's also a special BMW tool used by them to separate the half-shafts. People have reported being able to do without the special tool: it depends a lot on your skill as a mechanic as far as I can see. TO my eyes, the whole process looks quite challenging. But that depends on your skill as a mechanic, of course. Plus, as with a lot of jobs, it's much easier if you have a proper car lift. I was happy to pay dealer premium to get the job done by them and a BMW Certified option (UK insurers are very fussy about modifications that aren't manufacturer-certified).

Although the special tools to pop the half shafts out (and pop them in again) is the easiest way to do it, an equivalent tool that levers on the steps in the shaft behind the dust shield can be fashioned with some basic metal working skills. A large screwdriver and mallet with a wooden block as a pivot against the diff casing could work, but with the risk of damage to the boot or dust shield if it slips. It doesn’t take a lot of force to pop the circlip on the shaft, but it needs to be an abrupt force for both removal and insertion.

[Garrus]

I really liked the M240, and may get it one day.

Did anyone ever change the gearing in their new LSDs to anything higher? How did they like it?