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 Post subject: A-arm minimum lengths
PostPosted: September 17, 2019, 1:38 pm 
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Joined: May 31, 2019, 12:37 am
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Location: Alberta
Hey all, I’m building a non traditional, so my chassis dimensions are completely different than everything else. I’m trying not to have my wheels stick out too much, but I’m worried that my wishbones will be too short, due to my frame width.

Is there a length that would be considered too short and not to go shorter? Obviously the upper will be shorter as well, but mainly concerned with the minimum lower length, and still have good geometry

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PostPosted: September 17, 2019, 6:06 pm 
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Shortening the arms is after you've moved the left and right suspension together as close as possible.
Then fit a rack that puts the inner tie rod pivots the required width apart and height for no bumpsteer.

You can also run more backspace on the rims and design the arms to clear for adequate but reduced turning circle.

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PostPosted: September 17, 2019, 7:15 pm 
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Location: Alberta
I’ll be fabricating wishbones from scratch, so not shortening anything on this one. Just wondering if for example, 12” long lower wishbones is too short

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PostPosted: September 17, 2019, 11:18 pm 
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I happened to have a Miata LCA in my van, so in response to this query, I scampered out in the rain (rain in September, in western Oregon?) and measured it. 13" from pivot line to ball joint, so I'd opine that nope, 12" is kinda shortish, and certainly shorter than a Locost, but not too terribly short. If that's what your chassis demands, then GFI.

Glossary:
LCA = Lower Control Arm
GFI = Go For It

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PostPosted: September 18, 2019, 2:09 am 
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Joined: May 31, 2019, 12:37 am
Posts: 17
Location: Alberta
JackMcCornack wrote:
I happened to have a Miata LCA in my van, so in response to this query, I scampered out in the rain (rain in September, in western Oregon?) and measured it. 13" from pivot line to ball joint, so I'd opine that nope, 12" is kinda shortish, and certainly shorter than a Locost, but not too terribly short. If that's what your chassis demands, then GFI.

Glossary:
LCA = Lower Control Arm
GFI = Go For It



Thanks! As it stands now, I might be in that neighborhood. From outside of chassis to body is just over 17” now and with brackets and upright/hub/brake/rim I fear it might even be shorter.

I’ve been playing around with numbers on a suspension simulator but can’t seem to get detrimental effects from going that short.

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