Project S550 Part 2: Addressing Shortcomings in the Suspension and Drivetrain

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Once the strut was out, we were able to compress the stock spring with a spring compressor and reinstall the shorter Eibach spring.
The front Eibach spring compared to the larger stock spring. The Eibach Prokit spring lowers the front approximately 1.2 inches.
Here’s a size comparison of the stock vs. Eibach rear springs.

Now to dive into those body roll issues. For this, we took a two-pronged approach. First, we opted for thicker adjustable front and rear sway bars. The new front and rear bars measure in at 1 3/8 inches and 1 1/8 inches respectively, with three levels of adjustment. To match these, we also picked up a set of thick billet aluminum mounts. While we’ve never seen a stock mount flex in our research, the billet mounts just seemed like good insurance and a sensible upgrade since we were already in there. We set both the front and rear bars on the middle stiffness setting for baseline testing, as was recommended by both the manufacturer and our peers who have also performed this same install. Our second body roll correction was the installation of a K-Member brace to tie in the front control arm mounts as well as the subframe. It helps provide some additional chassis strengthening and also should help reduce the suspension geometry changes under high cornering loads. These updates exceeded our expectations in improving the handling characteristics of the car. If feels so much better now, the body roll has been reduced drastically and everything just feels much more predictable.

 

Here you can see the billet mounts and the included hardware.

 

 

We had our replacement sway bars powder coated to match the ingot silver paint of the exterior. OK, so maybe we’re a little OCD.
 

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