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SUMMARY-Rear suspension -Long Posted by saabsince 93b [Email]  (#972)  [Profile/Gallery]
(more from saabsince 93b) on Sat, 14 Aug 2010 07:42:42
In Reply to: JonAero1, Rich, Thu, 12 Aug 2010 11:22:36 Members do not see ads below this line. - Help Keep This Site Online - Signup |
As I read this post, and with my experience lately with fixing my rear suspension, there seems to be a piece missing.
Before you start grinding and dremeling control arms, I think it is important to think about the whole rear suspension and how it works.
The 9-5 suspension has 3 links. Two lateral, upper and lower and one longitudinal (front to rear).
When you go around a corner the outside rear suspension compresses, and you get more camber to keep the tire in great contact with the road and the toe in increases to help with turn in and to stop tire scrubbing.
The problem that we have is excessive toe-in causes the tires to cup. Increased toe-in during a turn is momentary. But if you suspension is permanently in a turn, which can happen if the ride height is not right you get excessive tire cupping and short tire life.
The Aeros seem to be more prone to improper ride height due to their spring permanently losing height and sacking.
Camber itself is not a bad thing. Take a look at F1 cars they look funny with all the camber they carry. My old 1973 911 Porsche has lots of camber in the rear on those wide tires and that is they way it should be. The wide tires always wear more on the inside, but they don't cup, because the suspension does not toe in in a turn.
Excessive toe-in causes cupping.
When messing with 95 rear suspension you have to start with ride height. Make sure it is right. The WIS says the ideal ride height with 17" wheels and sport [Aero] chassis is 620mm front and 610mm rear with car full of liquids and no driver. The WIS shows you how to measure the ride height.
If your rear suspension is at 580mm or 570mm you are going to have more toe-in and more camber that is not good for going down the road straight.
As the WIS says check the ride height first. this is critical. Correct ride height with new springs or spacers on the existing springs.
Next is the condition of the bushings. The outer upper lateral bushings are rubber and deteriorate and get a set with age. The longitudinal bushing at the front of the trailing arm is a big rubber bushing, and again age can take its toll. This one can be replaced by a harder poly bushing. I would replace both outer bushings and the lateral one.
So start with right height, then make sure the bushings are good, then get the adjustment right in the rear. Take a look at the WIS alignment charts and set the toe-in according to the ride height that you have. Don't let the alignment guy just use what his machine says. The spec is different for wheel size and sport or Aero suspension.
I hope this helps
_______________________________________ NOW OWN: 2000 95 Imola Red Aero 5 door stick - my ride HAVE OWNED: 2003 95 Black Aero 4 door auto Mary Ann's car 2004 95 Black Aero 5 door wagon 2001 95 Silver Aero 4 door stick 2001 95 Silver Aero 5 door wagon automatic 1999 95 Combi stick 1997 9000 Aero stick red 1988 900 SPG black 1988 900 Convertible black 1985 900 3 door turbo spg kit silver 1979 900 3 door turbo early 900 production 1966 96 2 stroke red 1960 95 wagon red 1959 93b light yellow
, Thu, 12 Aug 2010 12:14:53, Thu, 12 Aug 2010 16:21:05, Thu, 12 Aug 2010 13:02:00, Thu, 12 Aug 2010 13:43:39, Thu, 12 Aug 2010 13:44:51, Thu, 12 Aug 2010 21:35:39, Fri, 13 Aug 2010 09:57:25, Fri, 13 Aug 2010 11:16:33, Sat, 14 Aug 2010 07:42:42 <-- Viewing This Message, Fri, 13 Aug 2010 11:14:13
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