309PUG 2 1 Cars Posted April 16, 2007 Been reading up on suspension geometry and one thing that caught my eye was 'bump steer' wondered if anyone has actually measured there bump steer and if so how ?? Chris Share this post Link to post Share on other sites
veloce200 3 Posted April 18, 2007 Been reading up on suspension geometry and one thing that caught my eye was 'bump steer' wondered if anyone has actually measured there bump steer and if so how ?? Chris yes and the pug geometry is surprisingly good at bumpsteer through deflection and the "right" way round. unless you are competing at a high level don't worry about it! you can make a gauge real easy with a dial gauge and two pieces of wood and a door hinge. Share this post Link to post Share on other sites
bren_1.3 1 Posted April 19, 2007 any chance as to a brief explanation as to what bump steer is? Share this post Link to post Share on other sites
kyepan 291 Posted April 19, 2007 The ammount of change in the toe angle, when the suspension is in compression (bump). Usually referred to during cornering. bump steer can either cause the wheel to toe in during compression of the suspension, or toe out. Toe out cause the outside wheel to steer less than you want, causing understeer. The inside wheel would turn more as that would also be toe-ing out. Toe in... well actually i don't know what toe in would do in that situation, turn more i guess, but then the inside wheel would turn less. perhaps someone else more fluent would like to add to this Share this post Link to post Share on other sites
veloce200 3 Posted April 19, 2007 The ammount of change in the toe angle, when the suspension is in compression (bump). Usually referred to during cornering. bump steer can either cause the wheel to toe in during compression of the suspension, or toe out. Toe out cause the outside wheel to steer less than you want, causing understeer. The inside wheel would turn more as that would also be toe-ing out. Toe in... well actually i don't know what toe in would do in that situation, turn more i guess, but then the inside wheel would turn less. perhaps someone else more fluent would like to add to this remember the opposite happens on the other wheel - one is in compression and the other extension. Share this post Link to post Share on other sites
niklas 1 Posted April 19, 2007 In short, when cornering hard and the car is rolling, for every change in roll you have to adjust the steering wheel to keep the intended line. As far I'm aware, there are no other great disadvantages to it. It doesn't really alter the performance, it's just a minor annoyance. Share this post Link to post Share on other sites
