Tracking with an LSD

davidwarren · 01-02-2016, 10:02 PM

This might seem like a dumb question, but what can I expect on track with a new lsd as far as vehicle dynamics go? I've only tracked my e90 with the stock open diff before. I just ordered up an MFactory helical, and was wondering how it will behave differently. Any thoughts?

Cloud9blue · 01-03-2016, 02:01 AM

I think the better question to ask is what have you noticed so far with open diff.

davidwarren · 01-03-2016, 11:25 AM

Quote:

Originally Posted by Cloud9blue

I think the better question to ask is what have you noticed so far with open diff.

Mostly trouble keeping traction tracking out a turn.

I guess I was wondering if there was a noticeable change in the ability to rotate mid corner with the throttle.

feuer · 01-03-2016, 11:57 AM

Quote:

Originally Posted by davidwarren

Mostly trouble keeping traction tracking out a turn.

I guess I was wondering if there was a noticeable change in the ability to rotate mid corner with the throttle.

It would be more controlled (if you know what you doing of course) but corner speed will depend more on the front setup more.

Kgolf31 · 01-04-2016, 06:29 AM

Since you bought a helical you certainly won't see any off throttle rotation, as the diff essentially defaults to open at this stage since you're not locking it with throttle.

Sure, the diff will lock under acceleration. However as feuer said you're describing more suspension and wheel/tire setup to dictate exit speed.

Things like keeping traction could all be driver based error, such as getting on the gas too early.

Ginger_Extract · 01-04-2016, 02:51 PM

I have the MFactory Torsen. It's feels similar to stock in that the overall dynamic behaviors of the car are the same. However, the car will now be much better at digging out of the sharper corners, and be more tail happy/fun to drive on corner exit.

It won't overwhelm you, and is easy to drive, if thats what you're concerned about. No noticeable learning curve on my end.

davidwarren · 01-04-2016, 10:53 PM

Quote:

Originally Posted by Ginger_Extract

I have the MFactory Torsen. It's feels similar to stock in that the overall dynamic behaviors of the car are the same. However, the car will now be much better at digging out of the sharper corners, and be more tail happy/fun to drive on corner exit.

It won't overwhelm you, and is easy to drive, if thats what you're concerned about. No noticeable learning curve on my end.

Thanks

SeanS54 · 01-05-2016, 02:53 AM

It'll be more controllable and predictable at the limit and also allow you to carry a drift. This is with all the DSC nannies off.

sirdaft1 · 01-08-2016, 08:11 AM

I noticed the most major difference around long sweepers that allow for gradual acceleration. The LSD makes it a fun dance of finding the edge of adhesion and losing grip.

01-02-2016, 10:02 PM	#1
davidwarren Captain 187 Rep 670 Posts Drives: 328,325, 325, 335, X5, 640 GC Join Date: Dec 2011 Location: Louisville, ky iTrader: (0)	Tracking with an LSD This might seem like a dumb question, but what can I expect on track with a new lsd as far as vehicle dynamics go? I've only tracked my e90 with the stock open diff before. I just ordered up an MFactory helical, and was wondering how it will behave differently. Any thoughts? __________________ 2010 335i e90 Le Mans Blue/Chestnut Brown \| M-Sport \| 6MT
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01-03-2016, 02:01 AM	#2
Cloud9blue Brigadier General 711 Rep 3,251 Posts Drives: around the potholes Join Date: Aug 2008 Location: NY/NJ/MA iTrader: (13)	I think the better question to ask is what have you noticed so far with open diff. __________________ 09 BMW E92 335i: Top Mount EFR 7670 / Dinan / AP Racing / Wavetrac / TC Kline [Full Mod List] 07 BMW R1200S: Shine Yellow / Akrapovic / Ohlins 19 Volvo V90 T6: R-Design / Bowers & Wilkins / Polestar Optimization
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01-04-2016, 06:29 AM	#5
Kgolf31 Brigadier General 459 Rep 4,531 Posts Drives: 2007 Z4MC, 2012 128i Join Date: Sep 2008 Location: Ohio iTrader: (4)	Since you bought a helical you certainly won't see any off throttle rotation, as the diff essentially defaults to open at this stage since you're not locking it with throttle. Sure, the diff will lock under acceleration. However as feuer said you're describing more suspension and wheel/tire setup to dictate exit speed. Things like keeping traction could all be driver based error, such as getting on the gas too early.
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01-04-2016, 02:51 PM	#6
Ginger_Extract California-bound 385 Rep 1,480 Posts Drives: BMW 135i Join Date: Jan 2013 Location: Los Angeles, CA iTrader: (3)	I have the MFactory Torsen. It's feels similar to stock in that the overall dynamic behaviors of the car are the same. However, the car will now be much better at digging out of the sharper corners, and be more tail happy/fun to drive on corner exit. It won't overwhelm you, and is easy to drive, if thats what you're concerned about. No noticeable learning curve on my end. __________________ Streets of Willow: 1:27.7 CW 11/15/15; 1:29.5 CCW 8/15/15 \|\|\|\| Autoclub Speedway ROVAL (CCW): 1.52.6 - 12/2/17 Willow Springs - Big Willow (CW): 1:35.8 - 3/31/18 \|\|\|\| Buttonwillow #13 (CW): 1:59.3 1/27/18 https://www.facebook.com/JakeStumphRacing \|\|\|\| http://www.youtube.com/user/RaceMeMZ3
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01-05-2016, 02:53 AM	#8
SeanS54 Captain 168 Rep 842 Posts Drives: F82 M4 ZCP Join Date: Jan 2011 Location: Bay Area, CA iTrader: (20)	It'll be more controllable and predictable at the limit and also allow you to carry a drift. This is with all the DSC nannies off. __________________ https://www.youtube.com/user/SeanS54/videos
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01-08-2016, 08:11 AM	#9
sirdaft1 Brigadier General 2203 Rep 3,336 Posts Drives: X5 & E90 WTCC Widebody Racecar Join Date: Feb 2013 Location: Chicago West Burbs iTrader: (9) Garage List 2007 E90 WTCC Wideb ... [9.50] 2012 BMW X5 xDrive35i [9.00]	I noticed the most major difference around long sweepers that allow for gradual acceleration. The LSD makes it a fun dance of finding the edge of adhesion and losing grip.
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