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tperazzo tperazzo is offline
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Join Date: Nov 2008
Location: Huntington Beach, CA
Posts: 414
Originally Posted by aoncurly View Post
My comments were directed at the loads tperrazo described in his video, showing only horizontal loads at the shock towers. My belief is that the very nature of the shock towers (to stabilize the shocks) are loaded both vertically and horizontally. The shocks definitely see a vertical load component to bumps as the strut compresses and extends. The shocks are not vertical - they are cambered so there is also a horizontal component loading as well. Ideally, a bulkhead across the trunk would make that area torsionally very rigid. However, the impracticalities of this in a trunk negates this - no golf clubs! I am also not arguing that a strut and diagonal are necessary (unless you regularly track or race) - let's not forget, Porsche has the best engineers and they analyze the structure for loads that these cars experience and design accordingly. I would think that only in hard cornering while tracking and racing would any real benefits be felt. But I would agree that adding a strut/brace and diagonal braces would enhance torsional rigidity keeping the geometry of the struts and wheels as the designers intended.
Absolutely agree that there are forces in line with the struts when hitting bumps. That is why I measured the force in the strut bar when the right front strut was quickly cycled by dropping the car on a block. In fact, that is where I measured a peak force of 70 lbs in the horizontal strut bar (no diagonal connected).

The lateral strut tower forces were described when purely cornering. You are correct in the real world there are bumps in corners, however for the sake of experiment design these components were isolated into three different experiments as shown in the video.
Old 01-22-2019, 09:38 PM
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