 Semi-trailing arm angle, How does your rear trailing sit at ride height? |
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| Sbgunderson |
 May 29 2023, 09:07 AM
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#1
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Newbie  Group: Members Posts: 3 Joined: 31-July 20 From: Maryland Member No.: 24,557 Region Association: MidAtlantic Region  |
Happy Memorial Day, I hope everyone is doing well.
I am working on a tube chassis design. And I was wondering how your semi-trailing arms sit at ride height. Also if someone has an idea of an acceptable range and how that might affect alignment. It would probably be easiest to measure the angle on the top of the arm rather than the angle through the center of the wheel-bearing…. When you find a few minutes I would love to hear your semi-trailing arm angle at ride height! Thank you in advance Spencer |
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Replies(1 - 5)
| stownsen914 |
Jun 10 2023, 06:43 AM
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#2
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Senior Member Group: Members Posts: 930 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
Not sure if there is an ideal angle per se. If you are looking to optimize and are open to moving things around, it would be ideal to set the roll centers where you want them (and for the front too). 914 rear roll centers are high due to the trailing arm design. There are some limitations if you are planning to use the standard trailing arms. Many people raise the pickup points so the arms aren't at such an extreme angle when the car is lowered. I think I raised mine 3/4" - that was what I could conveniently get.
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| Trackd |
Aug 11 2023, 05:44 AM
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#3
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Newbie Group: Members Posts: 28 Joined: 23-January 20 From: Buffalo, NY Member No.: 23,854 Region Association: None |
QUOTE(stownsen914 @ Jun 10 2023, 06:43 AM)  Not sure if there is an ideal angle per se. If you are looking to optimize and are open to moving things around, it would be ideal to set the roll centers where you want them (and for the front too). 914 rear roll centers are high due to the trailing arm design. There are some limitations if you are planning to use the standard trailing arms. Many people raise the pickup points so the arms aren't at such an extreme angle when the car is lowered. I think I raised mine 3/4" - that was what I could conveniently get. How did you raise your rear pickup points? Any pictures? |
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| Brett W |
Aug 16 2023, 04:16 PM
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#4
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Advanced Member Group: Members Posts: 2,858 Joined: 17-September 03 From: huntsville, al Member No.: 1,169 Region Association: None 
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Copy this setup if you are building a tube chassis setup.
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| flxzcat |
Sep 26 2024, 06:05 PM
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#5
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Newbie Group: Members Posts: 11 Joined: 13-June 11 From: lake forest socal Member No.: 13,188 Region Association: None |
If you are going to go that far, why not make a much lighter trailing arm with two camber/roll center controlling links such as this... (this is just a simplified image showing an idea)
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| mepstein |
Sep 26 2024, 06:14 PM
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#6
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914-6 GT in waiting Group: Members Posts: 19,592 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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Tangerine racing has a kit.
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