Front Sway Bar Loads, Measured! |
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Front Sway Bar Loads, Measured! |
Matt Romanowski |
Aug 14 2023, 07:20 AM
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#1
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Senior Member Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507 |
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Racer |
Aug 14 2023, 07:45 AM
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#2
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Senior Member Group: Members Posts: 787 Joined: 25-August 03 From: Northern Virginia Member No.: 1,073 Region Association: MidAtlantic Region |
What track?
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Matt Romanowski |
Aug 14 2023, 09:22 AM
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#3
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Senior Member Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507 |
What track? Club Motorsports in Tamworth, NH. I also have a 375 lb springs in the front and a custom sway bar, so I'm not sure how relevant the data is to other cars, but it gives a decent idea of the sort of load that is there. As a comparison, NASCAR cars can see close to 3,000 lbs! |
jim_hoyland |
Aug 14 2023, 10:30 AM
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#4
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Get that VIN ? Group: Members Posts: 9,318 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California |
Wow ! Very cool; thanks for sharing.... (IMG:style_emoticons/default/smile.gif)
What does the strain gauge read when the car is at rest? |
yeahmag |
Aug 14 2023, 11:10 AM
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#5
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Advanced Member Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California |
Assuming no sort of weird setup, the drop links should see no load at rest on level ground with the correct ballast in the car.
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Matt Romanowski |
Aug 14 2023, 12:45 PM
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#6
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Senior Member Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507 |
Wow ! Very cool; thanks for sharing.... (IMG:style_emoticons/default/smile.gif) What does the strain gauge read when the car is at rest? It reads zero like pointed out. One interesting thing I learned is that you can not feel preload it the drop link heim joints. It can read 40 lbs and still feel free. |
jd74914 |
Aug 14 2023, 01:04 PM
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#7
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Its alive Group: Members Posts: 4,782 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
It reads zero like pointed out. One interesting thing I learned is that you can not feel preload it the drop link heim joints. It can read 40 lbs and still feel free. That's really interesting. Thanks for sharing! What's your bar look like if you don't mind me asking? Nascar? |
gereed75 |
Aug 14 2023, 01:07 PM
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#8
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Senior Member Group: Members Posts: 1,259 Joined: 19-March 13 From: Pittsburgh PA Member No.: 15,674 Region Association: North East States |
Very cool and thanks. Timely and useful for me. I am redoing the sway bars on my Datsun race car and re-designing the rear bar using an adjustable blade that will require a new mount point at the trailing arm. Was wondering about the loads this mount point will see. This gives me a ball park data point.
I assume this is a front bar?? Is there a rear bar on the car?? Thanks again. |
Matt Romanowski |
Aug 14 2023, 03:05 PM
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#9
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Senior Member Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507 |
It reads zero like pointed out. One interesting thing I learned is that you can not feel preload it the drop link heim joints. It can read 40 lbs and still feel free. That's really interesting. Thanks for sharing! What's your bar look like if you don't mind me asking? Nascar? It looks like a regular through body bar and uses the Tarrett ends, but it's a custom OD/ID, length, and uses monoballs to mount it instead of bushings. NASCAR bars, or at least the ones I'm familiar with, are huge and something like 2.5 or 3" OD and probably .100" or more wall. They are really stiff. |
Matt Romanowski |
Aug 14 2023, 03:05 PM
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#10
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Senior Member Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507 |
Very cool and thanks. Timely and useful for me. I am redoing the sway bars on my Datsun race car and re-designing the rear bar using an adjustable blade that will require a new mount point at the trailing arm. Was wondering about the loads this mount point will see. This gives me a ball park data point. I assume this is a front bar?? Is there a rear bar on the car?? Thanks again. Yes, this is the front bar and I don't have a rear bar. |
windforfun |
Aug 14 2023, 03:43 PM
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#11
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Senior Member Group: Members Posts: 1,835 Joined: 17-December 07 From: Blackhawk, CA Member No.: 8,476 Region Association: None |
Fantastic work!!! Strain must be a big concern. I'd want to know in what part of the suspension is it worst. Is the noise on the plots from road vibration? Dumb question I suppose.
(IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/smile.gif) |
Matt Romanowski |
Aug 15 2023, 05:28 AM
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#12
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Senior Member Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507 |
Fantastic work!!! Strain must be a big concern. I'd want to know in what part of the suspension is it worst. Is the noise on the plots from road vibration? Dumb question I suppose. (IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/smile.gif) Probably. To be honest, I haven't zoomed in far enough to really check that part out. |
jd74914 |
Aug 15 2023, 08:30 AM
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#13
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Its alive Group: Members Posts: 4,782 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
It reads zero like pointed out. One interesting thing I learned is that you can not feel preload it the drop link heim joints. It can read 40 lbs and still feel free. That's really interesting. Thanks for sharing! What's your bar look like if you don't mind me asking? Nascar? It looks like a regular through body bar and uses the Tarrett ends, but it's a custom OD/ID, length, and uses monoballs to mount it instead of bushings. NASCAR bars, or at least the ones I'm familiar with, are huge and something like 2.5 or 3" OD and probably .100" or more wall. They are really stiff. Thanks for the details. I have a Nascar bar (rear) that's 1" OD (forget ID) and splined. Only reason I asked. Their front bars are absolutely massive. It's crazy. |
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