Quote:
Originally Posted by gpshumway
I'm comparing OEM control arms to OEM steering knuckles. The 2006 WRX came with aluminum control arms. Is it possible that Karen had installed say Mevotech arms in place of the Subaru ones and it escaped my memory? Sure, it's possible. I'm saying that people who've used their Subarus hard in the past have had durability issues with OEM parts. (5x100 hubs anyone?) They don't have the huge safety margins we imagine, especially when used for track/autocross duty.
OEMs are not exempt from slapping parts together. The twins are quite obviously a frankenstein of parts-bin components. And the standard modeling they engage in may not include things like R-comp tires. As an example, take a look at 949 racings' discussion of wheel strength and racetrack use. ( LINK) For a historical example, consider the suspension mounts on an E46 M3.
Like I said in my original post, given the history of OEM parts used for track duty, and the prevalence of such duty for 86 twins, some slight concern is warranted. The aluminum knuckles should at least be given special attention during pre-track tech inspections. |
Even though the twin is a parts bin car, an FEA is pretty easy to preform and as well as material science is understood I wouldn't be afraid of it. OEM parts are built to a service factor well above normal use. Looking at one, or even multiple outliers shouldn't be cause for much concern. A rash of 06' WRX's breaking them, then I would be worried.