| jamal |
04-27-2019 05:20 PM |
Quote:
Originally Posted by maslin
(Post 3210822)
It should add negative camber until the LCA/strut break 90*, right? Sadly, the front struts are basically perpendicular to the ground, not a ton of angle to work with. It's the line from the top pivot to the ball joint, but that's not a huge angle.
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That angle between the ball joint and top mount is still 15 degree or so, and it's enough to pull the upright inward just slightly faster with strut compression than the ball joint for the entire bump travel of the suspension.
I remembered that I had plotted a few of the points from the suspension model thread and opened that up and measured some angles. The numbers in that spreadsheet are not right, and I moved things around a bit to what seemed more accurate based on the track width, tire size, sai, and listed roll center height. Not exact but hopefully close and shows how the camber curve should generally look:
http://jamalb.net/gallery/d/10035-1/brzcambercurve.jpg
0,0 is where the ball joint and inner control arm pivots are level, starting with zero camber at that point. I went up to see where the camber would stop going more negative and it appears to not happen until the ball joint is 4-5" above the inner pivot point. Which is much farther than the suspension can actually move. It might only have 2" from that point.
I think the reason for the difference with the other models is that some of the software treats a strut like double a-arm with an infinitely long upper arm. Maybe. I remember hearing that for some reason but don't remember where. But doing it like that would produce those curves posted earlier as the top mount would be moving straight up and down and the arc of the ball joint would be the only factor for the camber curve. |
