Here is a picture of the RS upright next to the stock upright that is being installed on Andi. As you can see, it raises the spindle, which lowers the car while still maintaining all of the original shock/spring travel. RS tie rods are also required. They have a slightly different geometry as well. I'll try and get a side by side of those as well.

 

Thanks Scott, how is the project coming?

 

The RS tie rods still have quite a bit of toe change. You may want to get the ERP units which significantly reduce it.

 

Excuse my ignorance but how does this upright improve the suspension on our cars? What will be compromised?

 

Scott: The project is actually moving forward. Some new hats are being machined on the 15" brake rotors to solve a clearance issue and then we should be in the home stretch.

Geoffrey: This will be a street only car, so I did not want to go too radical and I like to use OEM as much as possible.

Vincent. When our cars are lowered a lot using the method of adjusting the spring perches, there are two negative side effects.
The car becomes subject to bump-steer issues in fast sweeping corners due to 1).suspension tie-rod geometry changes and 2).reduced suspension travel.

The factory uses these parts on the RS cars to lower the car whilst maintaining proper geometry and suspension travel.

 

Scott, the RS uprights do not maintain proper geometry they improve the geometry, but still have issues.

 

Geoffrey, would you like to elaborate?

 

Can you please post the part numbers for the RS uprights?

 

I asked Mike today. He will either send it to me or post it later.

 

Upright part numbers:
993 341 157 81
993 341 158 81

 

BTW...I'm looking for a set.

 

So why don't you just order them?

 

Geoffrey...

I've got the Evo uprights on a 964 but it uses the standard 993 inner tie-rod along w/the RS outer tie rod (and yes the inner had to be cut about 1/4 to 1/2 inch to fit). It still seems to have issues w/caster and centering the car...at speed. Running:

-1.4º camber
3.2º caster
-0.01º toe

Do you think there is any difference running the inner motorsports tie rod than the 993 oe inner tie rod? This mix/match came from Smart or one of those places as a "kit" for the evo upright. I know the motorsports inner tie rod has a solid ball joint, but does that mean it has a different pickup point that would affect the highspeed centering issue? In the twisties it is simply brilliant, just working to get it to center better at over 80mph.

Suggestions?

 

Thanks!

 

Maybe increasing caster, if possible, would help? 3.2deg seems low(?).