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Re: Viggen alignment issues, long rambling response.  1 Saabers Like This Post!
Posted by Bernie [Email]  (#1501)  [Profile/Gallery]
(more from Bernie) on Wed, 21 Jun 2017 22:03:06
In Reply to: Viggen alignment issues, toe went out of spec in 300 miles (long), SPG Jr  [Profile/Gallery]
, Wed, 21 Jun 2017 14:00:07
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Hello,
First these are my thoughts/opinions. Second I perform numerous alignments at work on stock and modified cars including track, autocross and drifting cars.
1. Lets look at total toe numbers for the actual change after first alignment the total toe was +.12 and before the second alignment +.33. The left and right difference is just there setting of the steering wheel at center. So the change there is still excessive for 300 miles. But that still could be explained by there procedure for doing alignment.
Usually before performing an alignment you will lift the car and shake down the car to check for any play failing parts that should be changed before the alignment. After this the cars suspension needs to be settled back down to normal ride height before the alignment is carried out. This means you have to take the car for a drive and it is best if you do some hard cornering, accelerating and braking during the drive. This settles the suspension back down to its normal ride height. If I have the time I will let the car sit for several hours or overnight after the drive so it is truly back to its normal settled suspension. If this is not done the alignment measurements are not really accurate.
Also this brings us to the alignment machine and what type of compensation is performed on the car. As I have just gone over settling the car I only will use an alignment machine that allows for rolling compensation as opposed to one that has you jack up the car for compensation. Because if you jack it up the suspension is not going to properly settle in the few minutes before you perform the adjustments. A difference like you have above could be explained by the difference in suspension settling.
2. You did not tell us any other measurements on the car. Such as front camber and caster and rear toe, camber and thrust angle. Many people will not adjust anything on the rear due to the solid axle design but GS does sell shims that can be used to correct rear measurements. These numbers can give hints to bent or damaged items that may cause the car to pull. Toe will give you an off center steering wheel but not a pull.
3. Have you tried rotating tires or swapping tires side to side to see if the pull changes or lessons.
4. Looking at the modifications above the spacers in the front only could be a little odd.
So give us the rest of the measurements. See if moving the tires around helps. Give the suspension a good shakedown to see if anything has play. Check the strut tops for tears when the car raised off the ground. Good Luck, Bernie
_______________________________________ George Riggin Specialty Automotive Current Saabs 1993 900 Turbo Conv. 1993 900 Turbo Conv. Auto 2003 9-3 Conv 2004 9-5 Arc Sedan 2005 9-3 SS 4 door 2005 9-3 SS Conv 2007 9-5 Aero Sedan 1986 900 Turbo Conv A few parts cars also
, Wed, 21 Jun 2017 14:00:07, Wed, 21 Jun 2017 22:03:06 <-- Viewing This Message
1, Thu, 22 Jun 2017 19:31:56, Wed, 21 Jun 2017 15:34:51, Mon, 26 Jun 2017 16:57:38
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