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Old 01-20-2018, 03:56 AM   #2
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Join Date: Jul 2011
Location: Richmond, VA (The Fan)
Posts: 801
My college professor wouldn't be proud but I'm going to bring Wikipedia in as a reference. Wikipedia defines a-arm suspension as a design that uses a top and bottom arms to control the position of the wheel. Boxsters on the other hand rely on the shock assembly to control the location of the wheel. I think this is the key difference.

"An automobiles, a double wishbone suspension is an independent suspension design using two (occasionally parallel) wishbone-shaped arms to locate the wheel. Each wishbone or arm has two mounting points to the chassis and one joint at the knuckle. The shock absorber and coil spring mount to the wishbones to control vertical movement. Double wishbone designs allow the engineer to carefully control the motion of the wheel throughout suspension travel, controlling such parameters as camber angle, caster angle, toe pattern, roll center height, scrub radius, scuff and more."
1997 2.5 Boxster NASA Time Trial track car
2003 911 C2
NASA HPDE Instructor
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