Do our cars have a form of Limited Slip?

NPDAN · 10-25-2007, 06:10 PM

I got into a friendly argument today with my SA that has now become a freind of mine. He's insistent that our cars have partial Limited Slip Differential. He claims that if Im in 1st and mash out, I'll lay down 2 sets of tread, that both wheels will spin equally? (As long as Im going straight) I have tried this and only see one each time I try. Is this true and I could have something wrong or is he wrong?

JetskiMark · 10-25-2007, 06:27 PM

Partial LSD? Your SA is funny and uninformed. An open diff will spin both wheels when the traction is equal. Try turning right and punching it. You know that left wheel will not be smoking like the right one.

Regards,
Mark

S4to335 · 10-25-2007, 06:29 PM

No..that is why I bought a quaife LSD.

NPDAN · 10-25-2007, 06:31 PM

Quote:

Originally Posted by JetskiMark

Partial LSD? Your SA is funny and uninformed. An open diff will spin both wheels when the traction is equal. Try turning right and punching it. You know that left wheel will not be smoking like the right one.

Regards,
Mark

ha ha ha What are you doing Chiming in?

NPDAN · 10-25-2007, 06:32 PM

Quote:

Originally Posted by S4to335

No..that is why I bought a quaife LSD.

yep, that's why im buying the quaife...

JetskiMark · 10-25-2007, 06:58 PM

Quote:

Originally Posted by NPDAN

ha ha ha What are you doing Chiming in?

That was just too funny to pass up. Partial LSD, I know why you were arguing with your SA. I never realized my POS car had a Partial LSD. It spins both rear tires in the dirt. It also has Partial ABS. The brakes are so crappy, they don't lock up.

There are advantages to having a crappy car. I never lock it, wash it or worry about it getting damaged or stolen. You also don't have to slow down for speed bumps, dips or refrigerators.

Here is a short crappy video I shot in it.

Regards,
Mark

NPDAN · 10-25-2007, 07:00 PM

Quote:

Originally Posted by JetskiMark

That was just too funny to pass up. Partial LSD, I know why you were arguing with your SA. I never realized my POS car had a Partial LSD. It spins both rear tires in the dirt. It also has Partial ABS. The brakes are so crappy, they don't lock up.

There are advantages to having a crappy car. I never lock it, wash it or worry about it getting damaged or stolen. You also don't have to slow down for speed bumps, dips or refrigerators.

Here is a short crappy video I shot in it.

Regards,
Mark

Your a f'n nut

JetskiMark · 10-25-2007, 07:19 PM

Quote:

Originally Posted by NPDAN

Your a f'n nut

Thanks. It takes one to know one.

When you get your Quaife, are you going to get the 3.46 ring & pinion from the auto?

Regards,
Mark

ToddPhilly · 10-25-2007, 07:25 PM

Post march production 335's have an "Electronic Limited Slip" differential. It's really just a fancier version of DSC, but it might be marginally better than pre-March production cars. It's actually described on the 1-series mini site, but it is also on the 335's now. It may now be described as standard for the 2008's, but it has been included in the car since march.

NPDAN · 10-25-2007, 07:57 PM

Quote:

Originally Posted by ToddPhilly

Post march production 335's have an "Electronic Limited Slip" differential. It's really just a fancier version of DSC, but it might be marginally better than pre-March production cars. It's actually described on the 1-series mini site, but it is also on the 335's now. It may now be described as standard for the 2008's, but it has been included in the car since march.

hmmm Mine is a March 07 build.

shimshimhada · 10-26-2007, 12:47 AM

No.

!Xoible · 10-26-2007, 12:58 AM

dealers are full of it man... get him drunk and he'll tell u the truth

leftcoastman · 10-26-2007, 01:13 AM

I think he's talking about the electronic LSD.

don't quote me but I believe that leaving all nannies on will cut engine power when excessive slip is detected. Hitting the button once will engage brakes on the offending tire but not cut engine power.

Generally on the track, I run with everything completely off. I have done some sessions with one push of the button and boy the rear brakes heat up bigtime.

Richardo · 10-26-2007, 02:17 AM

Quote:

Originally Posted by leftcoastman

I think he's talking about the electronic LSD.

don't quote me but I believe that leaving all nannies on will cut engine power when excessive slip is detected. Hitting the button once will engage brakes on the offending tire but not cut engine power.

I can confirm the engine power cutting out. I accidentally left DSC on during one autocross run, and the power kept cutting out on me at various points, even with the gas pedal down. I wondered if it was fuel starvation until I realized I forgot to deactivate the traction control. No problems on subsequent runs (with everything off) and better times.

flyga3 · 10-26-2007, 04:11 PM

In reading the OM, under the Dynamic Traction Control section: "in the same way as with a differential interlock, even if DTC is activated, brake actions are still performed on the rear axle to enhance output if the drive wheels experience a significant loss of traction."
This statement is also listed under deactivating DSC.

So how much difference is there between this and a full blown LSD? (I'm still waiting to track my car, so I haven't felt this yet)

BTW-It still kills me that I have an LSD from the factory on my MINI but can't even get one on this beast.

Dascamel · 10-26-2007, 05:01 PM

Probably b/c they want to sell some M3s next year... It really should be an option. I was really shocked when the Cayman people told they me they don't get one either.

scottp999 · 10-26-2007, 06:12 PM

Quote:

Originally Posted by flyga3

In reading the OM, under the Dynamic Traction Control section: "in the same way as with a differential interlock, even if DTC is activated, brake actions are still performed on the rear axle to enhance output if the drive wheels experience a significant loss of traction."
This statement is also listed under deactivating DSC.

So how much difference is there between this and a full blown LSD? (I'm still waiting to track my car, so I haven't felt this yet)

BTW-It still kills me that I have an LSD from the factory on my MINI but can't even get one on this beast.

Maybe with DTC on it brakes the spinning wheel only until the locked wheel has more potential to spin and then as it begins to spin it lets up on the brake for the other wheel?

Not sure. Crazy we did not get LSD as standard. Is there an option for us that have the welded diff?

leftcoastman · 11-14-2007, 05:18 PM

I tried the "DTC" option at the track recently to see if it truly acted like an LSD.

It definitely kills wheelspin, which is nice, but also removes your ability to effectively throttle steer.

I see it this way. With everything off, I shouldn't light up my tires if I want fast times, but sometimes a little throttle steer will help you get around tight corners.

With DTC (one click), you can hammer the throttle on corner exit - it's just that nothing will happen until you get good traction. DTC will brake or cut power until you stop spinning. Throttle steering is all but impossible.

If DTC action wasn't so slow to "disengage" once you get traction, I'd say that it isn't a bad system. But as long as your right foot has fine motor control, you're likely faster without it on.

frankgtb · 09-06-2010, 07:25 PM

this e92 seemd to leave 2 rubber strips when it exits a hairpin 30 seconds into the video

marcel b · 09-10-2010, 05:29 AM

it will never come close to a proper LSD as a LSD will devert power to the wheel with the most traction, a e-diff brakes the spinning (inner) wheel... I have a Drexler LSD and the difference is night and day. You are being rocketed out of a corner, oversteer is much more controlable, and no xmas tree anymore on the dash

Disadvantage of DCT is that by apllying the brakes it creates understeer and secondly it smokes the rearbrakes. with a LSD you do not have these issues.

10-25-2007, 06:10 PM	#1
NPDAN Colonel 103 Rep 2,572 Posts Drives: AW DCT M3 Join Date: Feb 2007 Location: So.Cal iTrader: (7) Garage List 2008 E92 M3 [8.00] 07' E92 335i [0.00]	Do our cars have a form of Limited Slip? I got into a friendly argument today with my SA that has now become a freind of mine. He's insistent that our cars have partial Limited Slip Differential. He claims that if Im in 1st and mash out, I'll lay down 2 sets of tread, that both wheels will spin equally? (As long as Im going straight) I have tried this and only see one each time I try. Is this true and I could have something wrong or is he wrong? __________________
	Appreciate 0 Tweet Quote

10-25-2007, 06:27 PM	#2
JetskiMark Enlisted Member 1 Rep 30 Posts Drives: 2016 F83 Competition DCT AW Join Date: Apr 2007 Location: Near Los Angeles, California iTrader: (0)	Partial LSD? Your SA is funny and uninformed. An open diff will spin both wheels when the traction is equal. Try turning right and punching it. You know that left wheel will not be smoking like the right one. Regards, Mark
	Appreciate 0 Quote

10-25-2007, 06:29 PM	#3
S4to335 Brigadier General 475 Rep 4,380 Posts Drives: 2014 Audi A4 / 91 Track Miata Join Date: Jan 2007 Location: San Jose, CA iTrader: (5) Garage List 2007 BMW 335i sedan [8.00]	No..that is why I bought a quaife LSD. __________________ Car is now gone .... :-(
	Appreciate 0 Quote

10-25-2007, 07:25 PM	#9
ToddPhilly First Lieutenant 24 Rep 313 Posts Drives: BMW 335i Coupe Join Date: Mar 2006 Location: King of Prussia, PA iTrader: (0)	Post march production 335's have an "Electronic Limited Slip" differential. It's really just a fancier version of DSC, but it might be marginally better than pre-March production cars. It's actually described on the 1-series mini site, but it is also on the 335's now. It may now be described as standard for the 2008's, but it has been included in the car since march. __________________ 335i Coupe: Crimson Red / Black X3 3.0si: Alpine White / Sand Beige
	Appreciate 0 Quote

10-26-2007, 12:47 AM	#11
shimshimhada Brigadier General 502 Rep 4,838 Posts Drives: Portal Join Date: Jul 2005 Location: Portal iTrader: (2)	No.
	Appreciate 0 Quote

10-26-2007, 12:58 AM	#12
!Xoible Banned 904 Rep 46,010 Posts Drives: .... Join Date: Nov 2006 Location: . iTrader: (4) Garage List 2008 M3 [4.00] 2007 335i [9.00] 2008 528i [8.00] 2006 Infiniti - G35 ... [8.00]	dealers are full of it man... get him drunk and he'll tell u the truth
	Appreciate 0 Quote

10-26-2007, 01:13 AM	#13
leftcoastman Lieutenant Colonel 55 Rep 1,714 Posts Drives: 335i Join Date: Jan 2007 Location: Near some canyons iTrader: (1)	I think he's talking about the electronic LSD. don't quote me but I believe that leaving all nannies on will cut engine power when excessive slip is detected. Hitting the button once will engage brakes on the offending tire but not cut engine power. Generally on the track, I run with everything completely off. I have done some sessions with one push of the button and boy the rear brakes heat up bigtime.
	Appreciate 0 Quote

10-26-2007, 04:11 PM	#15
flyga3 Geboren zu Fahren! 12 Rep 376 Posts Drives: F25 X3 Join Date: May 2007 Location: Scottsdale, AZ iTrader: (0) Garage List 1965 FFR Challenge ... [0.00] 2011 BMW X3 [0.00]	In reading the OM, under the Dynamic Traction Control section: "in the same way as with a differential interlock, even if DTC is activated, brake actions are still performed on the rear axle to enhance output if the drive wheels experience a significant loss of traction." This statement is also listed under deactivating DSC. So how much difference is there between this and a full blown LSD? (I'm still waiting to track my car, so I haven't felt this yet) BTW-It still kills me that I have an LSD from the factory on my MINI but can't even get one on this beast. __________________ 2011 F25 X3 2.8 (in service) 2009 E90 328i (retired) 2007 E92 335i (retired) 2005 R53 MINI Cooper S (retired) 2002 E53 X5 3.0 (retired), 1999 E46 328i (retired)
	Appreciate 0 Quote

10-26-2007, 05:01 PM	#16
Dascamel Lieutenant Colonel 50 Rep 1,664 Posts Drives: 2008 e92 M3, 2010 e91 328i Join Date: Jul 2007 Location: Bakersfield, CA iTrader: (0)	Probably b/c they want to sell some M3s next year... It really should be an option. I was really shocked when the Cayman people told they me they don't get one either. __________________ 2008 E92 M3 Jerez Black,DCT,Fox Red ext,Prem,Tech,19", ipod/usb, CF roof and trim 2010 E91 328i Space Gray,Black int, M sport, most options 2007 Montego Blue 335i (retired)
	Appreciate 0 Quote

11-14-2007, 05:18 PM	#18
leftcoastman Lieutenant Colonel 55 Rep 1,714 Posts Drives: 335i Join Date: Jan 2007 Location: Near some canyons iTrader: (1)	I tried the "DTC" option at the track recently to see if it truly acted like an LSD. It definitely kills wheelspin, which is nice, but also removes your ability to effectively throttle steer. I see it this way. With everything off, I shouldn't light up my tires if I want fast times, but sometimes a little throttle steer will help you get around tight corners. With DTC (one click), you can hammer the throttle on corner exit - it's just that nothing will happen until you get good traction. DTC will brake or cut power until you stop spinning. Throttle steering is all but impossible. If DTC action wasn't so slow to "disengage" once you get traction, I'd say that it isn't a bad system. But as long as your right foot has fine motor control, you're likely faster without it on.
	Appreciate 0 Quote

09-06-2010, 07:25 PM	#19
frankgtb New Member 0 Rep 7 Posts Drives: 355gtb Join Date: Sep 2010 Location: toronto iTrader: (0)	this e92 seemd to leave 2 rubber strips when it exits a hairpin 30 seconds into the video
	Appreciate 0 Quote

09-10-2010, 05:29 AM	#20
marcel b Lieutenant Colonel 138 Rep 1,898 Posts Drives: F31 340i Join Date: Jun 2009 Location: Europe iTrader: (0)	it will never come close to a proper LSD as a LSD will devert power to the wheel with the most traction, a e-diff brakes the spinning (inner) wheel... I have a Drexler LSD and the difference is night and day. You are being rocketed out of a corner, oversteer is much more controlable, and no xmas tree anymore on the dash Disadvantage of DCT is that by apllying the brakes it creates understeer and secondly it smokes the rearbrakes. with a LSD you do not have these issues. Last edited by marcel b; 09-10-2010 at 05:37 AM..
	Appreciate 0 Quote