Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Vintage Mercedes Forum

Reply
 
LinkBack Thread Tools Display Modes
  #16  
Old 03-24-2010, 10:04 PM
diametricalbenz's Avatar
The Crowbar of Embriage
 
Join Date: Oct 2004
Location: Marietta, GA
Posts: 3,511
I am confused as to how a hydropneumatic setup would remove or significantly reduce the understeer. The range of geometry would be the same, the absorption response time is different but a car going from 3400lbs with a 53/47% F/R* weight distribution to ~4000lbs with tire, wheel variables being the same.

It seems plausible but the physics doesn't seem to add up using all 70's technology.

*(reference bgkast post #51 in Handling limits of the W123?)

Reply With Quote
  #17  
Old 03-24-2010, 10:19 PM
Registered User
 
Join Date: Jun 2004
Location: brisbane,Qld.Australia
Posts: 2,066
The W123 geometry itself is OK,it's the same as the W116.
The advantage of installing the hydro suspension is that it makes the suspension work because of the infinitely variable nature of the hydro .
The front struts,instead of collapsing under load (braking etc) as springs do,the energy is absorbed and the car retains it's correct attitude with the forces being transfered to rear where the rear suspension has anti squat geometry.
The same thing can be achieved with stiffer springs but then you have car that rides like a ricer ,bouncy on it's tyres with little actual springing.

With the incorrect spring rate in the front,Understeer goes from being predictable to down right dangerous as the weight is transfered to a point on the road ahead of the car. Imagine a scalene triangle out the front the car. the longest side being the road surface. the shortest being vertical from the axle center line. The upper side being the direction of the force.
The triangle becomes larger as the car speed rises . This causes the short side of the triangle to become longer exerting a leverage on the car body,in effect lifting the rear in air.
because the suspension arms are being forced up and they have in built understeer ,this becomes more acute the higher the rear rises,this forces the tyres to lose traction giving a plowing effect.

Last edited by mercmad6.3; 03-24-2010 at 10:34 PM.
Reply With Quote
  #18  
Old 03-27-2010, 12:22 PM
cth350's Avatar
Registered User
 
Join Date: Dec 2000
Location: Long Island, NY
Posts: 4,354
Ha! I know that car! There's an old shop next to it with lots of antique auto gear, right?

The guy wanted like 3,000$ for it a few years ago. He didn't like my offer of 650$.

-CTH

Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 10:31 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page