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What's the best settings for a Focus with a 1.5" drop? Zero toe F/R and less than 1 degree Neg. Camber?
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Your "less than 1 degree" negative camber must be at the front wheels because a 1.5 inch drop will usually result in somthing between -1.5° and -2.5° (or more) camber at the Focus's rear wheels.
Because of the Focus's passive rear steer independent suspension design, adjusting for rear toe will effect a static rear camber change. However, there is no factory adjustment for camber only, and attempting to do so solely with these adjustable short arms is hardly adviseable; the short arms do not attach in a proper location to what would be the rear hub portion of the spring steel control blade trailing arm for that. They are there to control the range of toe sweep throughout the suspension arc.
I will not suppose to tell anyone what the "best" settings are for their Focus; there're too many different driving styles, handling performance goals and tire budgets... but I will offer you what I use on my Focus which I use as a fun, great-handling but also high-speed-stable road car:
Zero° front toe. Zero. Neither toe-in nor toe out. My 1.4 inch drop results in a static 1.0° negative front camber.
The factory MINIMUM (I want as little static rear toe as was DESIGNED for)
rear toe-IN of 0.15° per side. On my 1.4 inch drop this toe setting results in 1.6°/left and 1.8°/right static negative camber on my Focus. (Altering the rear camber after the desired toe setting has been made requires the installation of aftermarket 1° camber adjustment bolts in the upper control arms's outer bolt location.)
I rotate my tires every 5000 miles and have experienced even tire wear through three set of tires since I lowered the car.
The car retains the fantastic factory Focus feel and it retains the award-winning driving dynamics mentioned earlier. The only change I would make if I were to autocross more might be a front camber change to between 1.5° to 1.8° negative and that would necessitate the installation of aftermarket front adjustable camber plates atop the struts.
Have fun!