I could of sworn that Macpherson strut suspensions always gain positive camber in bump but as I was doing analysis in Racing by the Numbers I was getting negative camber gain through the first 2.5" of travel.
I could of sworn that Macpherson strut suspensions always gain positive camber in bump but as I was doing analysis in Racing by the Numbers I was getting negative camber gain through the first 2.5" of travel.
yes
but seriously, sounds like there was a little miscalculation
I think a lot depends on the angle of the lower control arm. If it is canted downward, its effective length will increase in bump, pushing the lower part of the wheel outward, causing negative camber.
Don't know what you started with though.
wouldn't it gain negative if the LCA was going / to - instead of - to "backslash" (looking at the left side from the front)
looks like Teh E36 M3 said it better than I did.
Teh E36 M3 wrote: I think a lot depends on the angle of the lower control arm. If it is canted downward, its effective length will increase in bump, pushing the lower part of the wheel outward, causing negative camber. Don't know what you started with though.
Yup.
Teh E36 M3 wrote: I think a lot depends on the angle of the lower control arm. If it is canted downward, its effective length will increase in bump, pushing the lower part of the wheel outward, causing negative camber. Don't know what you started with though.
Ok cool. It is on an off road vehicle with long travel.
then I am pretty sure the lca is canted downwards at static rest
mad_machine wrote: then I am pretty sure the lca is canted downwards at static rest
It is. I had never messed with Macpherson strut before.
The sweep of the lower control arm always describes an arc. So, if you start with the arm angled toward the ground and sweep up - the bottom of the strut goes out - making a slight negative gain and widening the track as it goes. It will go positive if the stroke is long enough to have the control arm go past level with the ground.
Easy to draw a picture,then plan it. /_
The worst thing about struts, once the car leans, any gain goes out the window.
iceracer said: The worst thing about struts, once the car leans, any gain goes out the window.
Isn't that true of any suspension attached to the chassis (all of them)? It's just that some others can be more easily designed to gain negative camber in compression, perhaps over a longer range, so the compression of the outer wheel in roll does more to compensate for the camber loss due to that roll?
In the end, I suppose the results are about the same, I just like to keep cause and effect and mechanism straight. It helps with thinking about fixes.
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