How does our ESP work? - MBWorld.org Forums



E-Class (W211) 2003-2009

How does our ESP work?

Reply
 
 
 
LinkBack Thread Tools Search this Thread Rate Thread
Old 11-26-2008, 01:05 PM   #1
Member
Thread Starter
 
Join Date: Apr 2007
Location: SF Bay Area
Posts: 212
Drives: 2005 E320 CDI w/Brabus D6 + SB, PSS9, HRE
Thanks: 0
Thanked 0 Times in 0 Posts
How does our ESP work?

Specifically, what does the ESP (traction system) do when launching hard and one rear wheel spins?

a) engine output reduced electronically until spin is eliminated
b) rear brake applied to the individual spinning wheel
c) both
d) neither, its doing something else
seahonu is offline   Reply With Quote
Old 11-26-2008, 01:41 PM   #2
MBWorld Fanatic!
 
Join Date: Feb 2004
Location: South Orange County, CA
Posts: 5,143
Drives: 4 wheels
Thanks: 0
Thanked 0 Times in 0 Posts
C. But the brakes are applied to both rear wheels.

The next version of ESP in the new 2010 E class will even account for cross camber winds, road conditions, and have other safety gizmos as part of ESP.
MB Fanatic is offline   Reply With Quote
Old 11-26-2008, 02:37 PM   #3
Member
Thread Starter
 
Join Date: Apr 2007
Location: SF Bay Area
Posts: 212
Drives: 2005 E320 CDI w/Brabus D6 + SB, PSS9, HRE
Thanks: 0
Thanked 0 Times in 0 Posts
Oh dang. I thought ESP would only brake the ONE wheel that is spinning. So in order to get max traction, one would really need an LSD/Quaife. Meaning so that the ESP is not triggered to brake both sides. Correct?
seahonu is offline   Reply With Quote
Old 11-26-2008, 02:54 PM   #4
MBWorld Fanatic!
 
Diesel Benz's Avatar
 
Join Date: Dec 2006
Location: Europe
Posts: 5,102
Drives: 222.132 & 221.122 & 212.025 & 906.633
Thanked 1 Time in 1 Post
Quote:
Originally Posted by seahonu View Post
Oh dang. I thought ESP would only brake the ONE wheel that is spinning. So in order to get max traction, one would really need an LSD/Quaife. Meaning so that the ESP is not triggered to brake both sides. Correct?
ESP is not the feature taking care of wheel slip, that would be ASR although that and ABS and many others are actually controlled by the same control unit.

Anyway, ASR does brake individual wheels. If necessary, it would brake both rear wheels (on a RWD car).

Brakes are in practise always applied first, then engine power is reduced to avoid wheel slip. This is because brakes can be operated faster than the engine power can be reduced.

ASR cannot reach exactly the same traction as a mechanical LSD would provide but close.
Diesel Benz is offline   Reply With Quote
Old 11-27-2008, 12:01 AM   #5
Member
Thread Starter
 
Join Date: Apr 2007
Location: SF Bay Area
Posts: 212
Drives: 2005 E320 CDI w/Brabus D6 + SB, PSS9, HRE
Thanks: 0
Thanked 0 Times in 0 Posts
Thanks DieselBenz. That's what I thought our ESP/ASR was doing, ie. engine power and individual braking. So getting an LSD or Quaife, wouldn't make that much of a difference. I've heard others remarking with the Quaife, its night&day on how it helps acceleration at launch and thru the corners. But don't know whether its worth the $3K for parts & labor.

I'm just curious and annoyed with the recent rains here in northern CA, how my E320-CDI is slipping/spinning alot and how much the car deaccelerates with ESP/ASR. Admittedly when I turn ESP off, its much worse with a wheel totally spinning and going nowhere. I'm thinking that the ESP/ASR is tuned more conservatively and more aggressive driving would do better with the Quaife. Sounds like yes, but not by much.
seahonu is offline   Reply With Quote
Old 11-27-2008, 02:27 AM   #6
MBWorld Fanatic!
 
Join Date: Feb 2004
Location: South Orange County, CA
Posts: 5,143
Drives: 4 wheels
Thanks: 0
Thanked 0 Times in 0 Posts
Have you checked your tires? I had the stock Michelin's on mine and well they simply SUCK. I see you have CLS wheels, but don't use OEM tires.

Try some Michelin Pilot Sport A/S Plus. Fantastic tires. I just put them on my E320 Bluetec and they are fantastic tires. They stick to the road and have amazing grip, plus 30K tread warranty.
MB Fanatic is offline   Reply With Quote
Old 11-27-2008, 02:59 AM   #7
Member
Thread Starter
 
Join Date: Apr 2007
Location: SF Bay Area
Posts: 212
Drives: 2005 E320 CDI w/Brabus D6 + SB, PSS9, HRE
Thanks: 0
Thanked 0 Times in 0 Posts
Yes, the tires that came with the CLS wheel were OEM, Michelinm HX MXM, which do seem terrible in rain/wet. I've been trying to wear them down, but taking some time. Obviously a new set of tires are cheaper than a Quaife.
seahonu is offline   Reply With Quote
Old 11-27-2008, 12:02 PM   #8
Senior Member
 
Television's Avatar
 
Join Date: Oct 2006
Location: Southcoast England
Posts: 379
Drives: CL500 216
Thanks: 0
Thanked 0 Times in 0 Posts
ESP works on a pendulum device mounted on the front axle.
If you were going around a bend and the back broke loose, the pendulum would move under the force of the back braking out and use the BAS to apply the brakes to the correct wheel to correct the slew of the car and put it back on track.

I try and get across to folk the dangers of fitting wheels with the incorrect ET,, under the above conditions the ESP could over or under react as the width track of the wheels has changed
Television is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
collision assist inoperative djokodallas C Class (W205) 43 10-08-2016 07:59 PM
0-60 runs - what do you get? looney100 W212 AMG 15 01-19-2016 02:20 PM
3rd light, ABS/BAS/ESP light comes on after headlights are turned on angela12hickman E-Class (W210) 3 09-07-2015 10:55 PM
Need help! Changed alternator now no throttle AMG185MM W211 AMG 0 09-05-2015 06:23 PM
Is Power brake launch good? Sam26 C63 AMG (W204) 2 09-04-2015 03:58 AM


Tags
2005, asr, car, cdi, e320, esp, espasr, faster, meaning, mercedes, michelinm, pss9, tires, work, works


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off



All times are GMT -4. The time now is 06:20 PM.


Copyright 2001-2012 InternetBrands, Inc. / MBWorld.org. All Rights Reserved.