Car in question is the Celica. At stock height it has stock camber. Lowered it gains (Mac strut.) if I raise it I'll gain positive camber... Looking to do some rally cross soon (I'm rebuilding some stock strut tubes with all stock components.) out back is a solid axle, so. I worries there. Can you corner hard enough to use negative camber on gravel? I was whippin' my fit earlier today on a gravel road and couldn't get any body roll so I would assume it's not a big deal. I'm not trying to be competitive, so I don't care immensely. Just wondering if there are any added benefits.
Also, wondering if a skid plate is needed for the diff.
You shouldn't need a skid for the diff unless you have the absolute roughest rallycross site known to man or are running incredibly short tires. ~1.5 degrees negative camber seems to be the sweet spot for gravel, but loose surfaces aren't very picky- my rx7 has about 3 degrees of negative camber on all 4 wheels and doesn't seem to suffer from it.
Only cars with the most exquisitely designed suspension will do well with little to no camber.
On loose surfaces though, you might not want negative camber. It might be more helpful to have the sidewall dig into the surface than to get the biggest contact area - this is why purpose-made rally tires have very "square" sidewalls.
