Nerd’s Eye View: K-PAX Racing Volvo S60


Nerd's Eye View: K-PAX Racing Volvo S60 rear ohlins shocksMoving out back, K-PAX went with Ohlin's TTX40 MkII shocks again fitted with their blow off kit.  Oddly enough, the TTX40 uses twin-tubes instead of the nearly ubiquitous monotube.

Nerd's Eye View: K-PAX Racing Volvo S60 rear subframe fabricatedThe K-PAX Racing rear subframe allows for a full spherical bearing conversion and has corrected a lot of the ride and NVH compromises the S60 had when it rolled out of the factory.   Moving the rear differential up allows for reduced angles on the axles, which can contribute to roll resistance in a non-linear fashion (not to mention reduce component lifetime).  The rear differential housing is fabricated in house and stuffed with an Emco limited slip and either a 3.752 or 3.974 final drive, with the front differential remaining open per the rules.  As a result of the front weight bias and open front diff, the S60 uses a huge rear sway bar and no front sway bar as wheelspin was excessive with the front bar installed.  Easily accessed connection points for the control arms allow for quick and easy adjustment during practice and test sessions, and the integral jack point is a must with a car with extensive underbody work.  The brick located near the differential is there for weight ballast.

Nerd's Eye View: K-PAX Racing Volvo S60 rear Brembo Brakes

Like most front heavy cars, the S60's rear brakes are relatively under utilized.  The massive grip from the Pirelli tires and big power the car makes still necessitates large rotors and 4-piston Brembo calipers.  Rules limit the cars to 4-piston calipers unless OEM equipped with more.
Nerd's Eye View: K-PAX Racing Volvo S60  front brake rotors and padsAgain, battling the car's nose-heavy nature brings about frequent front brake servicing.  The front brakes are said to have the highest temps in the series, and team boss Bob Raub opines that the car really only has two brakes while everyone else gets four.  Keep in mind that these massive rotors completely fill the insides of the car's 18″ BBS Racing wheels.

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