trouble aligning 993
 

I have tried to get my '96 993 aligned several times by various shops. Car may be great at first but then drifts out of alignment, most recently to create dangerous over-steer. I have Bilstein PSS-10s fitted on the car. Any thoughts or recommendations? Is there any way to disable the kinematic toe? I have read some of the threads on here that describe the suspension but I'm left confused. :confused:
Thanks for your help in advance.
--David

When was the last time the monoballs were replaced?

there are several possible issues here, if the hardware isn't holding replace it. The toe links in particular can be replaced w/ Tarett toe links w/ positive locks.

KT can be eliminated by replacing all the rear suspension bushes w/ mono balls, but it's not likely that is something you want to do on a street car.

You can also replace all the stock rubber bushes w/ harder sport bushes, this doesn't eliminate KT but it does drastically reduce the effect. Elephant Racing has the bushes to do this but they are not listed on their web page, call and ask

be sure to take the car to a shop that knows 993s

Thank you for your advice. I'll take it up with my guy.:)

Are they setting the kinematic toe?

Kinematic toe out of spec causes all kinds of unsettling rear end motions.

I find it unlikely that a shop not specializing in 993s will have the special tools to do kinematic toe. Last I checked the tool for measuring kinematic toe was around $11,000 a set. Make sure your shop has these tools. They are a set of bubble gauges that mount directly to the plastic covers on the rear lower arms.

The $300 Autometric's tool works fine

I bought the aforementioned Elephant Racing Sport Bushes and RS/Evo uprights along with the Autometric tool this past week. I hope to get everything dialed in by Thursday this coming week. I'll give feedback as soon as I can.

Flat pad and smart strings

Mark the settings and bolt positions with paint pen, and you can see what adjustments are getting whacked.

If the adjusters will not hold & you don't want to spend the money for the upgraded arms. You might want to remove all the adjusting bolts, & get new ones. They may be a little chewed & can't hold.

Then clean all the bolt holes, & surfaces, then after the alignment, use some paint, or other marker on the adjuster & the arms. That way if they move you can see it, & adjust it back if need be. I used to do this on my track/street car to set my camber plates, never failed me.