335is with DCT, issues with Limited Slip Differential LSD or mods?

tphss · 02-16-2016, 10:19 AM

I'm looking into an N54 car again, and the 335is is my favorite because of the N54+DCT combo.

Does anyone have experience with running an LSD with different final ratio on a 335is DCT? I read that the DCT has some issues calibrating to a different ratio, something about adjusting torque handling according to speed/rpm in any specific gear. Basically the question is will I have an issue with a 3.08 (instead of the stock 2.56) LSD installed in a 335is with DCT?

For 335is owners with DCT, does the DCT slip with basic mods like DPs/FMIC/Tune?

BQTuning · 02-16-2016, 11:18 AM

Stick with the factory final drive ratio unless you want to be a guinea pig, and got money to spend for trails and errors. Plenty of LSD that retain the factor final drive ratio

tphss · 02-16-2016, 11:45 AM

Quote:

Originally Posted by BuraQ

Stick with the factory final drive ratio unless you want to be a guinea pig, and got money to spend for trails and errors. Plenty of LSD that retain the factor final drive ratio

So 3.08 won't work well?
I didn't see plenty of options unless custom ordering... ECS Tuning has complete diffs ready of 3.08 and 3.46, but not 2.56.

e90TiAg335i · 02-16-2016, 11:55 AM

Not sure of 3.08 but I know for sure 3.46 won't work at all with factory software. Tranny won't shift right even close enough to drive it a couple miles. I had a friend try and it wasn't pretty. Ended up swapping it back out.

Mike@N54Tuning.com · 02-16-2016, 11:57 AM

Quote:

Originally Posted by BuraQ

Stick with the factory final drive ratio unless you want to be a guinea pig, and got money to spend for trails and errors. Plenty of LSD that retain the factor final drive ratio

+1

Mike

tphss · 02-16-2016, 12:15 PM

Alright, I still had hope for 3.08 but that's gone now.

How much would a full pumpkin with 2.56 LSD ready to install cost? Helical type Quaife/MFactory.

Rezinator · 02-16-2016, 03:00 PM

VAC Motorsports in PA has 2.56 LSD in stock. I was quoted roughly $3200 for complete install if using my open diff as a donor.

MFactory · 02-17-2016, 02:18 AM

Quote:

Originally Posted by tphss

Alright, I still had hope for 3.08 but that's gone now.

How much would a full pumpkin with 2.56 LSD ready to install cost? Helical type Quaife/MFactory.

$2199.95 + $500 refundable core fee. We have them in stock

N54POWR · 03-11-2016, 06:25 PM

I have a 335is dct with the mfactory LSD. I went with the 2.81 gearing that came from a 335d
I haven't had any problems yet! Although that's not nearly as big a difference as goIng to the 3.08

Andym3100k · 03-11-2016, 08:08 PM

Quote:

Originally Posted by ChefHaze

I have a 335is dct with the mfactory LSD. I went with the 2.81 gearing that came from a 335d
I haven't had any problems yet! Although that's not nearly as big a difference as goIng to the 3.08

Wow sound great, so there is still hope for a replacement from the stock 2.56. How is the drive & what's the performance gain you had?

02-16-2016, 10:19 AM	#1
tphss das Eichhörnchen 47 Rep 279 Posts Drives: e92 M3, F32 435xi Join Date: Oct 2012 Location: Florida iTrader: (0)	335is with DCT, issues with Limited Slip Differential LSD or mods? I'm looking into an N54 car again, and the 335is is my favorite because of the N54+DCT combo. Does anyone have experience with running an LSD with different final ratio on a 335is DCT? I read that the DCT has some issues calibrating to a different ratio, something about adjusting torque handling according to speed/rpm in any specific gear. Basically the question is will I have an issue with a 3.08 (instead of the stock 2.56) LSD installed in a 335is with DCT? For 335is owners with DCT, does the DCT slip with basic mods like DPs/FMIC/Tune?
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02-16-2016, 11:18 AM	#2
BQTuning Banned 475 Rep 4,392 Posts Drives: 2012 Z4 sDrive35i M Sport 6MT Join Date: Nov 2010 Location: bq@bqtuning.com iTrader: (0)	Stick with the factory final drive ratio unless you want to be a guinea pig, and got money to spend for trails and errors. Plenty of LSD that retain the factor final drive ratio
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02-16-2016, 11:55 AM	#4
e90TiAg335i Major 127 Rep 1,151 Posts Drives: 10 e90 335i Join Date: Mar 2010 Location: jacksonville, FL iTrader: (10) Garage List 2010 e90 335i [7.00]	Not sure of 3.08 but I know for sure 3.46 won't work at all with factory software. Tranny won't shift right even close enough to drive it a couple miles. I had a friend try and it wasn't pretty. Ended up swapping it back out. __________________ JB4, DP, VMR V710, Sonic Tuning S1 coilovers, Hybrid Ovations, Soundsplinter 10" and Zapco DC Ref amps
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02-16-2016, 12:15 PM	#6
tphss das Eichhörnchen 47 Rep 279 Posts Drives: e92 M3, F32 435xi Join Date: Oct 2012 Location: Florida iTrader: (0)	Alright, I still had hope for 3.08 but that's gone now. How much would a full pumpkin with 2.56 LSD ready to install cost? Helical type Quaife/MFactory.
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02-16-2016, 03:00 PM	#7
Rezinator Second Lieutenant 38 Rep 255 Posts Drives: 335is Join Date: Aug 2013 Location: NE iTrader: (1)	VAC Motorsports in PA has 2.56 LSD in stock. I was quoted roughly $3200 for complete install if using my open diff as a donor.
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03-11-2016, 06:25 PM	#9
N54POWR Private First Class 52 Rep 165 Posts Drives: 2011 335is Join Date: Jun 2013 Location: Malibu, California iTrader: (0) Garage List 2011 335is [8.66]	I have a 335is dct with the mfactory LSD. I went with the 2.81 gearing that came from a 335d I haven't had any problems yet! Although that's not nearly as big a difference as goIng to the 3.08
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