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The BMW Range
3 Series
E90, E91, E92, E93
Learning to use an E90
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<blockquote data-quote="astroboy" data-source="post: 263607" data-attributes="member: 4527"><p>Oversteer and understeer has little to do with the drive terrain..</p><p></p><p>Oversteer means rear wheel skid while understeer means front wheel skid. Something to do with the grip and grip is a function of weight, thread design & condition, tyre compound, tyre pressure, speed, chassis balance, suspension set up, camber adjustment and few other things..</p><p></p><p>A balanced weight car like 3 series with weight equally distributed among all 4 wheels should get good score when it comes to oversteer or understeer situation, ceteri paribus.. </p><p></p><p>Now when it come to the tendency for the car moving straight, its part of all car design so the moment we let go the steering, car should move straight. The toe-in adjustment on the wheel is directly influencing this tendency to move straight. More toe-in means higher tendency to move straight while less toe-in means less tendency to move straight. Toe-out means car cannot go straight.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p></p><p>And different car has different factory specified toe-in degree. Wider tyre also would amplify the effect la.</p><p></p><p>If you feel uncomfortable, go check your toe-in in a normal front wheel alignment job. I am not surprised if it can happen to a brand new BMW. My E90 was returned to SC the immediate next day for alignment redo, the E90 alignment job was so badly set up until the steering wobbles.. I wonder why the PDI (pre-delivery Inspenction) did not check this..</p><p></p><p></p><p></p><p>That's because of the inertial or momentum of a FWD car with chassis weight concentrated to the front wheel.. so it takes more grip to "change" its original direction. That's why I say the 3-series should get good score due to the balance chassis weight. More camber would help.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p></blockquote><p></p>
[QUOTE="astroboy, post: 263607, member: 4527"] Oversteer and understeer has little to do with the drive terrain.. Oversteer means rear wheel skid while understeer means front wheel skid. Something to do with the grip and grip is a function of weight, thread design & condition, tyre compound, tyre pressure, speed, chassis balance, suspension set up, camber adjustment and few other things.. A balanced weight car like 3 series with weight equally distributed among all 4 wheels should get good score when it comes to oversteer or understeer situation, ceteri paribus.. Now when it come to the tendency for the car moving straight, its part of all car design so the moment we let go the steering, car should move straight. The toe-in adjustment on the wheel is directly influencing this tendency to move straight. More toe-in means higher tendency to move straight while less toe-in means less tendency to move straight. Toe-out means car cannot go straight.. :D And different car has different factory specified toe-in degree. Wider tyre also would amplify the effect la. If you feel uncomfortable, go check your toe-in in a normal front wheel alignment job. I am not surprised if it can happen to a brand new BMW. My E90 was returned to SC the immediate next day for alignment redo, the E90 alignment job was so badly set up until the steering wobbles.. I wonder why the PDI (pre-delivery Inspenction) did not check this.. That's because of the inertial or momentum of a FWD car with chassis weight concentrated to the front wheel.. so it takes more grip to "change" its original direction. That's why I say the 3-series should get good score due to the balance chassis weight. More camber would help.. :D [/QUOTE]
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