Everyone has a slightly different style
some of us use heavy bars, and others use little, blah- de- blah.
But since this is the track section, what tends to make an E30 corner fastest
is when the front and the rear let loose at roughly the same time in steady- state
higher- speed corners. As in, both outside tires are carrying their share of the cornering loads.
The rears probably need a little reserve grip to allow forward traction, but the M20
is no torque monster, and the vector math gives you a LOT of forward bite at the cost
of little side loss, so probably not much is needed.
What makes the most sense to me is that GC is NOT accounting for added front camber.
The stock E30 is very front- grip limited due to inadequate front camber. The rears are
cambered quite well, especially when you factor in an inch or so of lowering. So they
keep the fronts soft since the front tires roll over early, and let the rears take a larger part of
the cornering load, since their geometry can handle it.
This also might go a long ways towards explaining the big difference between SE30 and PRO3 setups. PRO3 can use front camber
plates and small springs, so most of those cars have a minimum of -3.5 degrees front-
and a lot of us can get over -4.
SE30 can't use smaller springs, so they're stuck with whatever they can get by other methods,
and while they're pretty creative, -2 would be optimistic there, I fear.
I dunno. But I do know that camber on radials is stupidly critical for lateral grip,
and variances in THAT could easily explain quite a few things....
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