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Message: <blockquote data-quote="WAFS" data-source="post: 4169252" data-attributes="member: 8087">Usually dc5 race cars use custom/aftermarket caster kit to get more caster angle than stock value. Why they need more caster is because they want more camber gain (in other words more grip and able to get more tuck-in/turn-in at mid corner) and better straightline stability (bcoz race cars usually hv very high static camber like 3.5deg-4deg which reduces straightline performance). Caster kit on our dc5 is actually an offset lower arm bush where it's offset forward so that the strut sits at an angle. This angle where the point of the top mount and lower ball joint which makes the steering axis with respect to the vertical line is known as caster angle. Our stock dc5 castor angle is not that much, same as other road cars because we use it on the road taking consideration uneven road wear and tear like our malaysian road. Caster kit usually suitable for track purpose. If use on road where u have high caster angle it will wear out and give stress to the top mount bush or the pillow ball bearing (pillow ball top mount). Usually castor kit either custom or aftermarket they design it with antidive where the bush is slanted at an angle for better braking. One of my friend had fabricated custom kit for his racecar and his cost is close to RM3000. Aftermarket castor kit is slightly more than the custom made ones. If you want to check our dc5 caster angle just go to an alignment shop and get your car on the alignment machine and check the castor.---------- Post added at 07:59 PM ---------- 6 hour anti-bump limit - Previous post was at 07:49 PM ----------Ali, the RCA and castor kit don't make the tie rod level. The tie rod level is the subject of the car's ride height/trim height. And also what makes the tie rod level is the strut arm...the mugen sport absorber has lower strut arm to counter the bumpsteer issue. The US made Zeta-R coilover has also lower strut arm that makes the tie rod level. Note: RCA is located at the lower arm ball joint and castor kit at the lower arm bush A & B.</blockquote>

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