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06-26-2014, 01:27 PM | #23 | |
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Looks like it's time I find a 3.46 bolted diff. Thanks for the info
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06-26-2014, 05:54 PM | #26 |
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Drives: 2017 F80 M3 ZCP BSM 2012 E82 1
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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:
*** 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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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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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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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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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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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, 05:57 PM | #39 |
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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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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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06-29-2014, 04:06 PM | #42 |
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Agreed!
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06-29-2014, 08:52 PM | #44 |
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