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The BMW Range
3 Series
E90, E91, E92, E93
Checking Tyre Pressure
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<blockquote data-quote="astroboy" data-source="post: 365983" data-attributes="member: 4527"><p>Darn... so I wrong again.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /> Maybe Rachel has been doing powerslides.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" /> Those wrinkles normally appear at the tyre shoulder, due to cornering.. serious! No believe me? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /></p><p></p><p>Quoted from <a href="http://www.design911.co.uk/blog/index.php/2008/11/12/diagnosing-problems-from-tire-wear/" target="_blank">http://www.design911.co.uk/blog/index.php/2008/11/12/diagnosing-problems-from-tire-wear/</a></p><p></p><p><span style="color: DarkRed"><strong>Diagnosing problems from tire wear.</strong></span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed">Here’s a generic fault-finding table for most types of tire wear:</span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed"><img src="http://www.design911.co.uk/blog/wp-content/uploads/2008/11/wear_patterns-300x128.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed"><strong>Shoulder Wear</strong></span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed">Both Shoulders wearing faster than the centre of the tread</span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed"> * Under-inflation</span></p><p><span style="color: DarkRed"> * Repeated high-speed cornering</span></p><p><span style="color: DarkRed"> * Improper matching of rims and tires</span></p><p><span style="color: DarkRed"> * Tires haven’t been rotated recently</span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed"><strong>Centre Wear</strong></span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed">The centre of the tread is wearing faster than the shoulders</span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed"> * Over-inflation</span></p><p><span style="color: DarkRed"> * Improper matching of rims and tires</span></p><p><span style="color: DarkRed"> * Tires haven’t been rotated recently</span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed"><strong>One-sided wear</strong> <span style="color: Navy">(Rachel's front right tyre suffer from this and it didn't mention air pressure.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" />)</span></span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed">One side of the tire wearing unusually fast</span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed"> * Improper wheel alignment (especially camber)</span></p><p><span style="color: DarkRed"> * Tires haven’t been rotated recently <span style="color: Navy">(Forget about this because staggered setup with asymmetric tyre not posible <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /> )</span></span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed"><strong>Spot wear</strong></span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed">A part (or a few parts) of the circumference of the tread are wearing faster than other parts.</span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed"> * Faulty suspension, rotating parts or brake parts</span></p><p><span style="color: DarkRed"> * Dynamic imbalance of tire/rim assembly</span></p><p><span style="color: DarkRed"> * Excessive runout of tire and rim assembly</span></p><p><span style="color: DarkRed"> * Sudden braking and rapid starting</span></p><p><span style="color: DarkRed"> * Under inflation</span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed"><strong>Diagonal wear</strong></span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed">A part (or a few parts) of the tread are wearing diagonally faster than other parts.</span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed"> * Faulty suspension, rotating parts or brake parts</span></p><p><span style="color: DarkRed"> * Improper wheel alignment</span></p><p><span style="color: DarkRed"> * Dynamic imbalance of tire/rim assembly</span></p><p><span style="color: DarkRed"> * Tires haven’t been rotated recently</span></p><p><span style="color: DarkRed"> * Under inflation</span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed"><strong>Feather-edged wear</strong></span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed">The blocks or ribs of the tread are wearing in a feather-edge pattern</span></p><p><span style="color: DarkRed"></span></p><p><span style="color: DarkRed"> * Improper wheel alignment (faulty toe-in)</span></p><p><span style="color: DarkRed"> * Bent axle beam</span></p><p><span style="color: DarkRed"></span></p><p></p><p>Meanwhile, found this alignment print out for an E39, before and after, notice the red means out and green means within... see how aggressive is the rear camber.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" /> Mine is only -1.10</p><p></p><p>Before:</p><p><img src="http://www.3.je/beforesmall.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>After:</p><p><img src="http://www.3.je/aftersmall.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>... and these are E46Fanatic's reading he got from SC when he did the job there for RM360.. </p><p></p><p><strong>Rear Axle:</strong></p><p>Camber -1:38</p><p>Toe + 0.09</p><p>Total Toe +0.18</p><p>Geometrical driving axis 0.00</p><p></p><p><strong>Front Axle:</strong></p><p>Castor 20deg: +7.13</p><p>Cross Castor: +0:01</p><p>Toe out on turns: -2:01</p><p>Cross Toe out on turns: +0.02</p><p>Camber: -0:54</p><p>Cross Camber + 0:10</p><p>Individual Toe : 0:05</p><p>Total Toe: +0.11</p><p></p><p><strong>Tyre Pressures:</strong></p><p>Rear 2.4</p><p>Front 2.2</p><p></p><p><strong>Tyre Depth:</strong></p><p>8mm (all 4)</p><p></p><p>These figures were taken back in March09, I wonder how's his tyre wear with those aggressive rear camber.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" /></p><p></p><p>Again, as I mentioned earlier, these are only recommended settings but individual drive style may demand personalized settings to ensure equal tyre wear.</p></blockquote><p></p>
[QUOTE="astroboy, post: 365983, member: 4527"] Darn... so I wrong again.. :( Maybe Rachel has been doing powerslides.. :eek: Those wrinkles normally appear at the tyre shoulder, due to cornering.. serious! No believe me? :( Quoted from [URL="http://www.design911.co.uk/blog/index.php/2008/11/12/diagnosing-problems-from-tire-wear/"]http://www.design911.co.uk/blog/index.php/2008/11/12/diagnosing-problems-from-tire-wear/[/URL] [COLOR="DarkRed"][B]Diagnosing problems from tire wear.[/B] Here’s a generic fault-finding table for most types of tire wear: [IMG]http://www.design911.co.uk/blog/wp-content/uploads/2008/11/wear_patterns-300x128.jpg[/IMG] [B]Shoulder Wear[/B] Both Shoulders wearing faster than the centre of the tread * Under-inflation * Repeated high-speed cornering * Improper matching of rims and tires * Tires haven’t been rotated recently [B]Centre Wear[/B] The centre of the tread is wearing faster than the shoulders * Over-inflation * Improper matching of rims and tires * Tires haven’t been rotated recently [B]One-sided wear[/B] [COLOR="Navy"](Rachel's front right tyre suffer from this and it didn't mention air pressure.. :rolleyes:)[/COLOR] One side of the tire wearing unusually fast * Improper wheel alignment (especially camber) * Tires haven’t been rotated recently [COLOR="Navy"](Forget about this because staggered setup with asymmetric tyre not posible :( )[/COLOR] [B]Spot wear[/B] A part (or a few parts) of the circumference of the tread are wearing faster than other parts. * Faulty suspension, rotating parts or brake parts * Dynamic imbalance of tire/rim assembly * Excessive runout of tire and rim assembly * Sudden braking and rapid starting * Under inflation [B]Diagonal wear[/B] A part (or a few parts) of the tread are wearing diagonally faster than other parts. * Faulty suspension, rotating parts or brake parts * Improper wheel alignment * Dynamic imbalance of tire/rim assembly * Tires haven’t been rotated recently * Under inflation [B]Feather-edged wear[/B] The blocks or ribs of the tread are wearing in a feather-edge pattern * Improper wheel alignment (faulty toe-in) * Bent axle beam [/COLOR] Meanwhile, found this alignment print out for an E39, before and after, notice the red means out and green means within... see how aggressive is the rear camber.. :eek: Mine is only -1.10 Before: [IMG]http://www.3.je/beforesmall.jpg[/IMG] After: [IMG]http://www.3.je/aftersmall.jpg[/IMG] ... and these are E46Fanatic's reading he got from SC when he did the job there for RM360.. [B]Rear Axle:[/B] Camber -1:38 Toe + 0.09 Total Toe +0.18 Geometrical driving axis 0.00 [B]Front Axle:[/B] Castor 20deg: +7.13 Cross Castor: +0:01 Toe out on turns: -2:01 Cross Toe out on turns: +0.02 Camber: -0:54 Cross Camber + 0:10 Individual Toe : 0:05 Total Toe: +0.11 [B]Tyre Pressures:[/B] Rear 2.4 Front 2.2 [B]Tyre Depth:[/B] 8mm (all 4) These figures were taken back in March09, I wonder how's his tyre wear with those aggressive rear camber.. :eek: Again, as I mentioned earlier, these are only recommended settings but individual drive style may demand personalized settings to ensure equal tyre wear. [/QUOTE]
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Checking Tyre Pressure
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