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Yes, you can use camber plates to reduce scrub radius. There is also a very slight benefit to pushing them in...it raises your roll center a little.
However, angling the strut inwards more with camber plates and increasing your SAI has some drawbacks that IMO outweigh the scrub radius issue, namely the change in camber for the outside wheel as you increase steering angle. It's not as big of a deal if you add caster at the same time, but it's important.
In most cases I recommend getting most of your camber from the hub. The change in scrub radius is pretty small. For what it's worth, a lot of the really high end dampers will come with some neat camber adjustment at the lower mount, either specially designed bolts for a slotted lower mount or "keys" (I'm not sure what else to call them) that go in the slot. The Nurburgring Challenge STI that I saw in Japan for example simply has (roughly) center fixed location lowering top mounts and got it's camber at the lower mount. Group N rally cars get their camber at the lower mount as well. Part of it is application specific I'm sure (higher steering angles having something to do with it) and many very fast cars still do get a lot of camber from plates.
With regards to scrub radius, a very large value can feel pretty awful in terms of steering kickback, effort, and also do some funky things with toe change. A wider track width is generally a good thing, but you have to keep in mind the scrub radius issue.
I don't have any set numbers for you guys, but -10mm in offset from stock is certainly fine IMO.
- Andrew
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