[jellish]

nice!

[07tundra]

Anyone else looking to do this the same guy I bought my stuff from has a 3.15 diff w/driveshaft for 800+ shipping no axles though but im sure you can find those

[FEDE/E92]

Originally Posted by 07tundra

Anyone else looking to do this the same guy I bought my stuff from has a 3.15 diff w/driveshaft for 800+ shipping no axles though but im sure you can find those

Hit me up with his info

[07tundra]

Originally Posted by FEDE/E92

Hit me up with his info

pm'd

[07tundra]

Originally Posted by neuroclast

nice!

So why is it that BMW uses a 2 piece ds? why cant an aluminum one piece ds be used?

[07tundra]

anyone?

[Christopher John]

Originally Posted by AlexN

With an aftermarket diff, you'll still have to pay a machine shop to install the diff in the pumpkin and you'll still keep the weaker 335 axles and driveshaft.

A very big benefit to go with the M3 diff is the fact that you can eventually part it out and sell it as a bolt on kit and make most of your money back. (you'll just need a new 335i DS)



you're lucky as you can choose.
MT guys can only use the 3.15 which will shorten the gears a bit
335is DCT guys (2.56 ratio) will need to open the diff up and change the final gear

Anyone with a 335is do this yet? Can the tranny be reprogrammed? Not that a 3.15 would be used, in fact it would suck, but just curious.

[jellish]

Originally Posted by 07tundra

So why is it that BMW uses a 2 piece ds? why cant an aluminum one piece ds be used?

You can, you'd just have to have one made. I don't know why BMW used a 2 piece, but it probably had something to do with optimum angles on the u-joints (purely a guess though).

[Aus335iguy]

Can't we just code for the different ratios?

[Christopher John]

Originally Posted by Aus335iguy

Can't we just code for the different ratios?

How do the Nissan GT-R guys get away with all their shenanigans? There must be a way to retrain the system. Although the current final ratio is probably sufficient, maybe lower when boosted.

[DR-JEKL]

Originally Posted by 07tundra

So why is it that BMW uses a 2 piece ds? why cant an aluminum one piece ds be used?

I believe VTT use a Cr Mo one piece DS, and there are one piece cf options out there also.

[AlexN]

Originally Posted by 07tundra

So why is it that BMW uses a 2 piece ds? why cant an aluminum one piece ds be used?

a one piece driveshaft is definitely possible

Here is one guy who used a custom made carbon driveshaft by the drive shaft shop

http://www.e90post.com/forums/showpo...&postcount=322

It's $1399 and you'll need to supply the exact dimensions for it.

VTT uses the same one

[07tundra]

Looks like the 335 dct has the same drive shaft as the m3 style does anyone know the length? Maybe there won't be a need to modify the 335 nondct drive shaft if it is in deed the same length

[Aus335iguy]

Originally Posted by 07tundra

Looks like the 335 dct has the same drive shaft as the m3 style does anyone know the length? Maybe there won't be a need to modify the 335 nondct drive shaft if it is in deed the same length

@******** broke one if I recall... he might know
Stands to reason they would be the same style the DCT in the 335i is exactly the same as the one in the M3

[07tundra]

Originally Posted by Aus335iguy

@******** broke one if I recall... he might know
Stands to reason they would be the same style the DCT in the 335i is exactly the same as the one in the M3

Now the only thing is length?

[BQTuning]

Originally Posted by 07tundra

Now the only thing is length?

I really dont know. There is a guy who is a BMW tech I think that work on his own car whos did the swap

BoostNinja perhaps he can chime in more on the subject.

[BoostNinja]

3.15 gearing will not work on dct. It is programmed to the transmission. Will set faults and be undrivable. Regearing to within 10% of 2.56. Closer is better. You will have to shorten the m3 shaft to fit.

[07tundra]

Originally Posted by BoostNinja

3.15 gearing will not work on dct. It is programmed to the transmission. Will set faults and be undrivable. Regearing to within 10% of 2.56. Closer is better. You will have to shorten the m3 shaft to fit.

I'm Not sure what your trying to say but this what I'm asking BoostNinja

So just wondering on the length of the m3 ds vs 335i dct ds vs 335i mt ds?


335i dct driveshaft looks like it bolts up exactly like the m3 driveshaft

https://www.facebook.com/photo.php?f...1868117&type=3

the left is the dct ds from a 335i

[BoostNinja]

no it does not bolt up the same. different bolt pattern on transmission side.

on the diff side the m3 shaft and diff use a cv with 6 bolts. The dct shaft has one nut connection like all 335i

the length is also different.

you will need a m3 shaft and modify it to get it all to work.

[BoostNinja]

That picture is one that I took when converting David Rooney's 135i to DCT. The shaft on the left looks different because it has a protection cap on the end for shipping purposes. It is removed before install.

[07tundra]

Originally Posted by BoostNinja

That picture is one that I took when converting David Rooney's 135i to DCT. The shaft on the left looks different because it has a protection cap on the end for shipping purposes. It is removed before install.

My apologies you are completely correct in the pic it looked like the m3 ds. So back to the drawing board.

[ucsbwsr]

Originally Posted by 07tundra

I'm Not sure what your trying to say but this what I'm asking BoostNinja

So just wondering on the length of the m3 ds vs 335i dct ds vs 335i mt ds?

Drive shaft lengths are listed in millimeters on RealOem, you can use that info in combination with looking at pics of driveshafts for sale on eBay and start to connect the dots. This is what I did for retrofitting my M5 driveshaft on my E61, I ended up needing an E60 M5 guibo, M5 trans output flange, and having the shaft custom lengthened (30mm) to fit.

Evan