BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      06-26-2014, 01:27 PM   #23
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Quote:
Originally Posted by dcaron9999 View Post
With a bolted ring gear Diff (DCT + steptronic), 3 hours of labor by a qualified shop is required, as there are tight tolerances to respect and shims to add/remove to install the LSD chunk (inside the pumpkin).

The whole pumpkin installation (LSD chunk already installed) is a reasonable DIY, if you have the proper tools.

This table highlites the options and subtle differences, to help you pick and search for the proper used pumpkin
Master Reference Chart:
Hm. That's not so bad...just wanted to make sure it wasn't a 12hr job or something along those lines.

Looks like it's time I find a 3.46 bolted diff. Thanks for the info
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      06-26-2014, 03:10 PM   #24
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The DCT is welded. it even says so on that chart you posted.
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      06-26-2014, 03:31 PM   #25
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Any thoughts on the Dinan LSD?
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      06-26-2014, 05:54 PM   #26
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Originally Posted by zx10guy View Post
Any thoughts on the Dinan LSD?
+1
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      06-26-2014, 07:04 PM   #27
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Quote:
Originally Posted by zx10guy View Post
Any thoughts on the Dinan LSD?
I've read dinan uses wavetrac units
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      06-26-2014, 11:04 PM   #28
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Quote:
Originally Posted by Andrewcoja View Post
The DCT is welded. it even says so on that chart you posted.
Yes it does and now I'm confused
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      06-26-2014, 11:08 PM   #29
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This is the chart on Quaife's sit for DCT aTBs

http://www.hpashop.com/Quaife-LSD-13...e-DCT-135i.htm
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      06-27-2014, 03:06 AM   #30
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Looks like all DCT have welded rings, and 2.56 ratio. Probably requires more labor and ratio bump from 2.56 to 3.08 or 3.46 might too high, so better stick with 2.56.

See what your options are with the top four diff rebuilders in the US:
  1. HP Autosport
  2. ***VAC Motorsports (probably cheapest, even sells stock pre-built complete differential housings with Quaife LSD installed)
  3. DiffsOnline
  4. Turner Motorsports
Send them an email or call them to get an estimate.

*** The E87 & E88 135i is equipped with a welded ring and pinion gear making it impossible for most facilitys to install an aftermarket LSD. As the master importer for Quaife, we have special machinery and techniques for fitting this and other LSDs into your OEM differential! No more waiting and overpaying for early cores, buying extra kits, and no downtime as you send your diff out!
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Last edited by dcaron9999; 06-27-2014 at 03:11 AM..
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      06-27-2014, 03:26 AM   #31
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Quote:
Originally Posted by dcaron9999 View Post
Looks like all DCT have welded rings, and 2.56 ratio. Probably requires more labor and ratio bump from 2.56 to 3.08 or 3.46 might too high, so better stick with 2.56.

See what your options are with the top four diff rebuilders in the US:
  1. HP Autosport
  2. ***VAC Motorsports (probably cheapest, even sells stock pre-built complete differential housings with Quaife LSD installed)
  3. DiffsOnline
  4. Turner Motorsports
Send them an email or call them to get an estimate.

*** The E87 & E88 135i is equipped with a welded ring and pinion gear making it impossible for most facilitys to install an aftermarket LSD. As the master importer for Quaife, we have special machinery and techniques for fitting this and other LSDs into your OEM differential! No more waiting and overpaying for early cores, buying extra kits, and no downtime as you send your diff out!

All DCT and ALL* Manual cars except for 2007 models have welded ring gears. The cost between a DCT diff and a Manual diff should be the same, both require the same exact machining process. However the cost difference comes in with the cost of the CORE. Finding a used Manual 3.08 diff is easy, but the same cannot be said for the 2.56 DCT diff. Because of this shops charge more for DCT builds... DCT owners should be able to avoid the added cost by directly shipping your DCT diff for machining.
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      06-27-2014, 03:44 AM   #32
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Quote:
Originally Posted by Sfvalley135i View Post
All DCT and ALL* Manual cars except for 2007 models have welded ring gears. The cost between a DCT diff and a Manual diff should be the same, both require the same exact machining process. However the cost difference comes in with the cost of the CORE. Finding a used Manual 3.08 diff is easy, but the same cannot be said for the 2.56 DCT diff. Because of this shops charge more for DCT builds... DCT owners should be able to avoid the added cost by directly shipping your DCT diff for machining.
Agreed.

For my 2011 135i, I found a used 3.46 bolted diff from a 2007 335i. So I did not have to pay core charges, or have a disabled car while I my diff got re-done across the border (live in Canada).

OP should still explore options with VAC motorsports, as they carry a large inventory. For his 2.56 large housing, he will likely have to pay core charges, and get a refund when he sends his Open diff back ...
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      06-27-2014, 06:18 AM   #33
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Quote:
Originally Posted by dcaron9999 View Post
Looks like all DCT have welded rings, and 2.56 ratio. Probably requires more labor and ratio bump from 2.56 to 3.08 or 3.46 might too high, so better stick with 2.56.

See what your options are with the top four diff rebuilders in the US:
  1. HP Autosport
  2. ***VAC Motorsports (probably cheapest, even sells stock pre-built complete differential housings with Quaife LSD installed)
  3. DiffsOnline
  4. Turner Motorsports
Send them an email or call them to get an estimate.

*** The E87 & E88 135i is equipped with a welded ring and pinion gear making it impossible for most facilitys to install an aftermarket LSD. As the master importer for Quaife, we have special machinery and techniques for fitting this and other LSDs into your OEM differential! No more waiting and overpaying for early cores, buying extra kits, and no downtime as you send your diff out!
Don't forget Jim at Performance Gearing.

IMO it is worth the value for a Clutch-Type over a Torsen
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      06-27-2014, 08:31 AM   #34
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Quote:
Originally Posted by dcaron9999 View Post

*** The E87 & E88 135i is equipped with a welded ring and pinion gear making it impossible for most facilitys to install an aftermarket LSD. As the master importer for Quaife, we have special machinery and techniques for fitting this and other LSDs into your OEM differential! No more waiting and overpaying for early cores, buying extra kits, and no downtime as you send your diff out!
Whoa whoa whoa.

So all 6AT 135i have bolted ring gears - except the verts? BMW just decided to use a welded ring on the E88s for some reason? If that's true i'm It's the same motor, mated to the same trans, mated to the same output shafts. Why would they do that? Surely to spite me...
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      06-27-2014, 12:41 PM   #35
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Quote:
Originally Posted by 135Pats View Post
Whoa whoa whoa.

So all 6AT 135i have bolted ring gears - except the verts? BMW just decided to use a welded ring on the E88s for some reason? If that's true i'm It's the same motor, mated to the same trans, mated to the same output shafts. Why would they do that? Surely to spite me...

Ya I agree, that sounds strange... hard to believe bmw would differentiate between body style...


Here is Pre Order List for Welded Differentials DCT and MANUAL...

http://www.e90post.com/forums/showthread.php?t=1003680
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      06-27-2014, 01:45 PM   #36
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Stephen @ M-Factory confirmed every 6AT 135i he's ever laid eyes on is bolted. So there doesn't seem to be a difference with E88 vs E82. It would be truly bizarre if that were not the case so that's a relief.
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      06-27-2014, 02:15 PM   #37
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I've been considering an LSD as well, based on how shitty the e-diff is with the wheel/tire combo that was on the car. However, when I upgraded the wheels/tires to Durezza ZIIs in 255 on the rear, I honestly don't think I spun up the inside wheel once on an otherwise stock BMWPPK N54 while at the track.

For those that went with LSD, were you still experiencing driveability issues on extreme performance summer tires sized up in the rear?

The main weak points I noticed on this car at the track are the brakes and suspension (including subframe bushings). Except to spend $1k+ to replace the bushings with solid ones, I don't know if it is worth it.

It has me contemplating just finding a used e36 M3 to beat on at the track. Heck you could even supercharge it for kicks for the price of an LSD for our cars.
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      06-27-2014, 05:54 PM   #38
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Is the smiles per mile worth the miles per gallon with the 3.46? I was going that way buy I don't know now!
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      06-27-2014, 05:57 PM   #39
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Is the smiles per mile worth the miles per gallon with the 3.46? I was going that way buy I don't know now!
Are you 6MT? I've driven a 3.46 MT car and it's extremely aggressive for street driving. The car has ridiculous twitch on stock frames which is cool, but it got old in the 10 minutes I drove around.
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      06-28-2014, 05:34 PM   #40
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Quote:
Originally Posted by 135Pats View Post
Are you 6MT? I've driven a 3.46 MT car and it's extremely aggressive for street driving. The car has ridiculous twitch on stock frames which is cool, but it got old in the 10 minutes I drove around.
Im a 6MT on a 3.46, and I disagree.

1st gear is kind of short. 2nd gear onwards is a blast when you step on it.

The car can still be driven "softly" around town by modulating the throttle more gently, but on the highway or on the track is where the higher ratio 3.46 LSD shines.
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      06-28-2014, 09:47 PM   #41
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Quote:
Originally Posted by dcaron9999 View Post
Im a 6MT on a 3.46, and I disagree.

1st gear is kind of short. 2nd gear onwards is a blast when you step on it.

The car can still be driven "softly" around town by modulating the throttle more gently, but on the highway or on the track is where the higher ratio 3.46 LSD shines.
Think it's fair to say it's a matter of subjective preference. It's pretty aggressive though...
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      06-29-2014, 04:06 PM   #42
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Quote:
Originally Posted by 135Pats View Post
Think it's fair to say it's a matter of subjective preference. It's pretty aggressive though...
Agreed!
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      06-29-2014, 08:36 PM   #43
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My Quaife 3.08 MT is awfully twitchy for me, I can't imagine what a 3.46 would feel like.
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      06-29-2014, 08:52 PM   #44
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Quote:
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My Quaife 3.08 MT is awfully twitchy for me, I can't imagine what a 3.46 would feel like.
What do yall mean by "twitchy"? That is the first time i've heard anything bad about LSDs on our cars.
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