Can't speak to D2 springs, but with my Eibach Prokit springs, I used additional suspension components to keep my Z in alignment specs.
Its stock suspension besides the lowering springs. I believe its has a toe issue. I am wearing out tires on the inner side of the tire, down to the belt, within spring-fall driving season.Can't speak to D2 springs, but with my Eibach Prokit springs, I used additional suspension components to keep my Z in alignment specs.
Definitely a combination of toe as well as caster and camber. Not hard to see why. Lowering a car changes all of the suspension angles naturally. Bringing it back into spec (or to your desired performance spec), you need adjustability, something lacking in the stock suspension.Depending on how low your springs take you, camber may be so extreme that you'll wear out the inside of your front tires no matter what you do. Have you looked into some adjustable front upper control arms? SPL makes a nice set:
SPL 350Z / G35 Titanium Series Front Upper Camber Arms - Z1 Motorsports - Performance OEM and Aftermarket Engineered Parts Global Leader In 300ZX 350Z 370Z G35 G37 Q50 Q60