Hi there, maybe you can help me -- I also have a rwd P85 and am getting excessive inner tire wear in the rear. I've ordered N2itive rear camber arms only. On the toe setting, when I look under the car, the eccentrics are set to almost max toe in.I'm running -0.4 camber and +0.02 toe all around with my N2itive links, and my RWD P85 car drives comfortably. (it does require slightly more attention and corrections at 75mph, which would be fixed by more like +0.05 toe in the front, but I'm only 40% highway driving so I don't mind.)
I'm very heavy on the throttle, and my rear tires have 35k on them, and still look like more than half their tread life remaining.
Keep in mind the motors pull the tires forward, increasing toe in during acceleration, which can result in slip. I was very adamant during alignment that I wanted rear toe extremely close to zero, not +0.10 or +0.15 listed on N2itive's site
(I first tried +0.15 rear toe and got tire slip around 60% throttle when stopped, but now at +0.02 rear I can go 90% throttle before slipping)
My question: when you lower the car, does it tend to increase toe in or toe out? I'm hoping you want less toe in as if that is the case, I have a lot of adjustment left in the stock eccentrics. If you need more toe in, then I might need the toe arms.