will the 135 rear differential be one-piece?

[crzy4135i]

After doing some research online, it appears newer rear differentials in the 335i are one piece. The ring gear can't be unbolted for installation of an aftermarket limited slip differential. If it really is one piece.. installing a mechanical rear lsd will be VERY expensive. I get the feeling bmw will not offer rear lsd's as an option because it leaves the 135i with a major performance handicap that will prevent it from embarrassing the M3.

I guess I'll wait and see if the 135i really comes with a one-piece differential. If true, I won't order one. Coming from an awd car there's no way I'll sell it for a rear drive car with electronic differential. I wonder if the entire rear axle could be retrofitted from an older M3?

http://www.turnermotorsport.com/html...=100-100-00008

http://www.activeautowerke.com/drive...92335/main.php

[Fast Kiwi]

My rep has told me BMW will offer an LSD as a dealer installed option under there new performance section..

so, good new for you.. you can still get the 1er..

[crzy4135i]

Originally Posted by Fast kiwi

My rep has told me BMW will offer an LSD as a dealer installed option under there new performance section..

so, good new for you.. you can still get the 1er..

Your rep? You mean a sales guy at the dealership? I'm going to my dealership *this afternoon* to speak with the sales guy that sold me our '06 325i. He told me awhile back that bmw might offer their own software upgrade for the 135 but I didn't know to ask about rear lsd's at the time.

It sounds like bmw finally realized the profit margin on performance upgrades is (likely) higher than new car sales. Assuming the test drive goes OK, I will definitely get the 135i with a dealer installed lsd.. bmw oem software upgrade would also be a dream come true. Thanks!!!

[BMWeber]

if you use the search function you.........ahh never mined

[crzy4135i]

Originally Posted by BMWeber

if you use the search function you.........ahh never mined

Thanks for the kind welcome wagon post with the requisite "search the archives" comment. I just went to my bmw dealer and they do not know of a dealer installed optional lsd for 335i, or anything abou the 135i. I did get a copy of the bmw performance brochure. I'll keep checking in with them and hope for the best. I also test drove a 335i to get a feel for the power.

[Fast Kiwi]

Originally Posted by crzy4135i

Your rep? You mean a sales guy at the dealership? I'm going to my dealership *this afternoon* to speak with the sales guy that sold me our '06 325i. He told me awhile back that bmw might offer their own software upgrade for the 135 but I didn't know to ask about rear lsd's at the time.

It sounds like bmw finally realized the profit margin on performance upgrades is (likely) higher than new car sales. Assuming the test drive goes OK, I will definitely get the 135i with a dealer installed lsd.. bmw oem software upgrade would also be a dream come true. Thanks!!!

LOL.. NO, i mean... MY rep.. funny enough, im that "sales guy"

and your welcome..

There isnt any info about it as yet.. But he seemed pretty sure about this

[BMWeber]

Originally Posted by crzy4135i

Thanks for the kind welcome wagon post with the requisite "search the archives" comment. I just went to my bmw dealer and they do not know of a dealer installed optional lsd for 335i, or anything abou the 135i. I did get a copy of the bmw performance brochure. I'll keep checking in with them and hope for the best. I also test drove a 335i to get a feel for the power.

sorry we get a little bored here and we go over the same thing many times so when someone comes in and asks questions that have Been discussed debated and beaten to death we get a little snappy. sorry again :biggrin:

if your dealer knows nothing about the 135i find a new dealer. they should have at the lest the brochure and base pricing.

[Garrett]

Originally Posted by crzy4135i

After doing some research online, it appears newer rear differentials in the 335i are one piece. The ring gear can't be unbolted for installation of an aftermarket limited slip differential. If it really is one piece.. installing a mechanical rear lsd will be VERY expensive. I get the feeling bmw will not offer rear lsd's as an option because it leaves the 135i with a major performance handicap that will prevent it from embarrassing the M3.

I guess I'll wait and see if the 135i really comes with a one-piece differential. If true, I won't order one. Coming from an awd car there's no way I'll sell it for a rear drive car with electronic differential. I wonder if the entire rear axle could be retrofitted from an older M3?

http://www.turnermotorsport.com/html...=100-100-00008

http://www.activeautowerke.com/drive...92335/main.php

??

Moot, because you don't need an aftermarket LSD in the future. BMW will offer it out of THEIR Performance catalogue and installed at the dealership!

If you dealership has no knowledge of this.. then ask them why they don't read their own Roundel magazine or the news briefs!

[Fast Kiwi]

Originally Posted by Garrett

??

Moot, because you don't need an aftermarket LSD in the future. BMW will offer it out of THEIR Performance catalogue and installed at the dealership!

If you dealership has no knowledge of this.. then ask them why they don't read their own Roundel magazine or the news briefs!

Thank you.. I knew some one was listening out there..

[crzy4135i]

Originally Posted by BMWeber

sorry we get a little bored here and we go over the same thing many times so when someone comes in and asks questions that have Been discussed debated and beaten to death we get a little snappy. sorry again :biggrin:

if your dealer knows nothing about the 135i find a new dealer. they should have at the lest the brochure and base pricing.

No problem.. it's funny because I've responded the same way on other forums. It's almost a form of initiation to be told to search the forums. My dealer is checkered flag bmw in Va Beach. They're great for service and have a nice coffee machine.

[larryn]

You may have already seen this pic in another thread, but it certainly pertains to this one too. This is the diff on the 135i, and pretty much answers the topic of this thread:

[BMWeber]

I think the major thing is the new diffs ring and pinion is welded to the chuck not that you cant open it up. i will check into this this week and get some info

[JO3]

if the 1er has a welded dif, they wouldn't that make it that much more difficult to offer a dealer installed optional LSD? That makes me think it won't be welded - for ease of installing their own upgrade.

[BMW135iCA]

I agree witht Joe.

Chris

[dereknmmi]

I think it might be more expensive to go with the dealer installed performance upgrades, but smarter because of warranty issues.

[BMWeber]

Originally Posted by joe

if the 1er has a welded dif, they wouldn't that make it that much more difficult to offer a dealer installed optional LSD? That makes me think it won't be welded - for ease of installing their own upgrade.

I would almost guarantee the BMW LSD will be an entire assembly not just a chuck. somewhat like what HARTGE offers. assembling the diff and shimming and lining up the ring and pinion is a bit touchy so I doubt BMW would leave it up to the dealers. I just hope the BMW LSD doesn't have the same sticker shock

http://www.turnermotorsport.com/html...CT_ID=33920335

[Fast Kiwi]

^^ wholy crap!!! thats expensive..

[atr_hugo]

Originally Posted by Fast kiwi

^^ wholy crap!!! thats expensive..

+1 - at that price you'd think it was hand-carved out of a single billet of 'unobtainium'.

[Euro Durch Tod]

the 1er has potential but if the diff is welded and an upgrade its the same as the 335 im gonna be disappointed. thats a pretty expansive upgrade for a part that should be installed on a car with that kinda power. I have to say its pretty said bmw didnt relize this and if there doin it for the aftermarket profits that sux.

[eMINI]

Does this replacement diff use the same final drive ratio as OE? Or, is there an option for a numerically higher final drive?

[Fast Kiwi]

Originally Posted by Euro Durch Tod

the 1er has potential but if the diff is welded and an upgrade its the same as the 335 im gonna be disappointed. thats a pretty expansive upgrade for a part that should be installed on a car with that kinda power. I have to say its pretty said bmw didnt relize this and if there doin it for the aftermarket profits that sux.

I dont think thats the reason behind it as BMW has had the Ediff for such a long time.. its worked for them for some time so i can imagine changing directions would be an expensive venture, amoung other reasons.. I just hope it doesnt cost too much..

[crzy4135i]

Originally Posted by eMINI

Does this replacement diff use the same final drive ratio as OE? Or, is there an option for a numerically higher final drive?

I agree with the post regarding the dealers installing the entire lsd rear end as a unit. The only problem is the original welded ring gear means the original won't be usable as a core, which leads me to believe it will cost at least $3k, probably closer to $4k. IF they swap in the entire rear as a unit, it would be very easy for bmw to provide a better gear ratio.