Shock Absorber Function 6KRFNDEVRUEHUVSURYLGHGDPSLQJE\IRUFLQJRLOZKLFKLVXQGHUSUHVVXUHWKURXJKRUL¿FHVLQWKHSLVWRQ$VWKHYHUWLFDOYHORFLW\RI WKHVXVSHQVLRQLQFUHDVHVSLVWRQVSHHGWKURXJKWKHRLOLQFUHDVHVDVZHOODORQJZLWKGDPSLQJIRUFHV $VKRFNG\QDPRPHWHUFDQEHKHOSIXOE\PHDVXULQJWKHVSHFL¿FGDPSLQJIRUFHFUHDWHGE\WKHSLVWRQDVLWDFFHOHUDWHVDQGGHFHOHU - DWHVIURPDGHDGVWRSWRDFKRVHQSHDNYHORFLW\ZKLFKW\SLFDOO\RFFXUV´´SHUVHFRQG7KHGDPSLQJIRUFHVPD\EHHYDOXDWHG E\VFUXWLQL]LQJVKDIWYHORFLW\LQLQFKHVSHUVHFRQGRQWKHKRUL]RQWDODQGGDPSLQJIRUFHVLQSRXQGVRQWKHYHUWLFDO&RPSUHVVLRQ IRUFHVDUHW\SLFDOO\H[SUHVVHGIURP]HURXSZKLOHUHERXQGIRUFHVDUHVSHOOHGRXWIURP]HURGRZQ $QRWKHUFULWLFDODVSHFWRIVKRFNDEVRUEHUIXQFWLRQLVEOHHGZKLFKLVWKHXQUHVWULFWHGÀRZRIRLOWKDWE\SDVVHVWKHYDOYHGLVFVWDFN DOVRUHIHUUHGWRDVE\SDVV7KHEOHHGFKDUDFWHULVWLFRIWKHSLVWRQGHVLJQGHWHUPLQHVWKHDPRXQWRI³VORZSLVWRQVSHHG´FRQWURO DYDLODEOHEHIRUHWKHVKRFN¶VYDOYLQJEHJLQVWRFRQWUROWKHKLJKHUYHORFLW\IRUFHV3LVWRQVWKDWXWLOL]HDKLJKEOHHGGHVLJQSURYLGHVPDOO DPRXQWVRIGDPSLQJDWORZSLVWRQVSHHGVZKLOHORZEOHHGSLVWRQVFUHDWHODUJHDPRXQWVRIGDPSLQJDWORZSLVWRQVSHHGV :KHQVHOHFWLQJVKRFNDEVRUEHUVLWLVKLJKO\UHFRPPHQGHGWRIROORZWKHPDQXIDFWXUHU¶VUHFRPPHQGDWLRQVFRQFHUQLQJVHOHFWLRQDV HDFKKDYHEHHQH[WHQVLYHO\WHVWHGDQGUDFHSURYHQWREHVXFFHVVIXOLQWKHFKRVHQYHQXHKRZHYHUGXHWRWKHPDQ\YDULDEOHVWKDW H[LVWLWLVLPSRUWDQWWRKDYHDEDVLFXQGHUVWDQGLQJRIKRZVKRFNGDPSLQJUDWHVFDQDIIHFWODSWLPHV$GMXVWPHQWFDQWKHQEHSHU - IRUPHGXVLQJUHDVRQDQGXQGHUVWDQGLQJDVWRKRZWKH\ZLOODIIHFWWKHJLYHQFDU 6KRFNDEVRUEHUVDUHXVHGWRVLPSO\FRQYHUWWKHNLQHWLFHQHUJ\RIVSULQJPRYHPHQWVLQWRKHDWZKLFKLVWKHQGLVVLSDWHGLQWRWKHDLU WKURXJKWKHVKRFNWXEHRUERG\$VKRFNDEVRUEHU¶VIXQFWLRQLVWRPDLQWDLQPD[LPXPWLUHFRQWDFWSDWFKWRWKHWUDFNDVWKHFDUWUDYHOV GRZQWKHVWUDLJKWDZD\VDQGFRUQHUVZKLOHQHJRWLDWLQJWKURXJKDOORIWKHLUUHJXODULWLHVWKDWH[LVWRQWKHUDFHWUDFNVXUIDFH 6SULQJUDWHGHWHUPLQHVKRZIDUWKHFKDVVLVUROOVSLWFKHVRUVTXDWV6KRFNUDWHFRQWUROVWKHOHQJWKRIWLPHLWWDNHVIRUHDFKRIWKHVH movements to occur. REBOUND DAMPING FRQWUROVWKHPRYHPHQWRIWKDWSDUW 5)/)55RU/5 RIWKHFDU¶VVSUXQJPDVVWKDWLVVWRUHGLQDFRP - SUHVVHGVSULQJ,WDGGLWLRQDOO\GHWHUPLQHVKRZORQJLWWDNHVIRUWKHFRPSUHVVHGVSULQJWRUHWXUQWRWKHVWDWLFULGHKHLJKW7KHODUJHU WKHUHERXQGWKHJUHDWHUWKDWWKHVKRFNUHVLVWVWKHFRPSUHVVHGVSULQJ¶VHIIRUWWRUHERXQGDQGWKHORQJHULWWDNHVWKHFKDVVLVWRUHWXUQ to static ride height. COMPRESSION DAMPING FRQWUROVRQO\WKHRVFLOODWLRQRIWKHFDU¶VXQVSUXQJZHLJKWWKHUHE\H[SODLQLQJZK\LWLVQRUPDOWRXVH OHVVFRPSUHVVLRQGDPSLQJWKDQUHERXQGGDPSLQJ7KHRQO\H[FHSWLRQWRWKLVZRXOGEHZKHQLW¶VGHVLUHGWRVORZWKHGRZQZDUG PRYHPHQWRQDVSHFL¿FFRUQHURIWKHFDUWRPLPLFWKHHIIHFWRIDVWLIIHUVSULQJ Think Track ,QDQHIIRUWWRLQFUHDVHFRQVLVWHQF\DQGSHUIRUPDQFH%LOVWHLQHVWDEOLVKHGJXLGHOLQHVWRXVHZKHQSHUIRUPLQJVKRFNWXQLQJDWWKH WUDFNRUZKHQWU\LQJWRPDNHWKHEHVWGHFLVLRQVGXULQJLQLWLDOVHWXS7KLVLVRIFRXUVHWKDWDVPDQ\YDULDEOHVDVSRVVLEOHKDYHEHHQ UHPRYHGDQGWKDWWKHEHVWFRPELQDWLRQRIVSULQJVZHLJKWVZKHHOVSDFHUVWLUHFRPSRXQGVWDJJHUHWFDUHDOOLQSODFH 8WLOL]LQJWKH³7KLQN7UDFN´JUDSKLFVWXG\WKHIROORZLQJOLVWRIVXJJHVWLRQV7KH\DUHQRWUXOHVKRZHYHUEXWWHQGHQFLHVWKDWDUHPRUH RIWHQWUXHWKDQQRWZKHQUDFLQJODWHPRGHOVDQGPRGL¿HGVRQDVSKDOWRUGLUWVXUIDFHV.HHSLQPLQGWKDWWKHUHDUHPDQ\DGMXVWPHQWV RQ\RXUFKDVVLVRWKHUWKDQVKRFNDEVRUEHUV2YHUVWHHUXQGHUVWHHUEDODQFHPD\EHDIIHFWHGE\VWDJJHUWLUHFRPSRXQGZKHHOVSDF - LQJVSULQJUDWHVVZD\EDUSDQKDUGDQGRWKHUV6KRFNVPD\EHXVHGWR¿QHWXQHWKHFKDVVLVLQRUGHUWRJDLQWKDWODVWIHZWHQWKVRI second on the track.
THINK TRACK.
IF THE CAR IS: LOOSE (OVERSTEER) FROM 0° TO 90° • Increase compression rate in front • Decrease rebound rate on rear, or only on left rear TIGHT (UNDERSTEER) FROM 0° TO 90° • Decrease compression on front, or only on right front • Increase rebound rate on rear, or only on left rear LOOSE (OVERSTEER) FROM 90° TO 0° • Decrease rebound rate on front
0° #3
#2
0°
135°
45°
All you have to do is determine what you want the car to do from entry to exit. Just think it through!
90°
90°
• Decrease compression rate on rear TIGHT (UNDERSTEER) FROM 90° TO 0° • Increase rebound rate on front • Increase compression rate on rear, or only on right rear WHEN ANALYZING CORNER ENTRY, OR DECELERATION HANDLING, REALIZE THAT THE CHASSIS IS AFFECTED BY: • Compression rate in front • Rebound rate at rear WHEN ANALYZING CORNER EXIT, OR ACCELERATION HANDLING, REALIZE THAT THE CHASSIS IS AFFECTED BY: • Rebound rate in front • Compression rate at rear Special thank you to Bilstein Motorsports for the technical reference 0° 0° 135° #1 #4
45°
229
2019-20 CIRCLE TRACK PARTS AND ACCESSORIES
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