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<blockquote data-quote="pollyp" data-source="post: 564358" data-attributes="member: 4527"><p>before i align the wheels tomorrow I I'll need to plan the method and calculate what readings to aim for</p><p></p><p>very first step is to place her on a level platform, apply my body weight ballast in drivers seat and adjust tyre pressures till the rim to floor distances are equal cos each tyre has slightly different tread depth and sidewall stiffness.</p><p></p><p>I've measured the front & rear tracking to find the offset distance 20.5mm between the front & rear wheels. the wheel base is also 2350mm</p><p></p><p>[ATTACH=full]42448[/ATTACH] </p><p></p><p>now we need to align the rear axle first cos due to the panhard rod of a solid beam axle, it could be shifted laterally offset relative to the chassis & front wheels.</p><p>This could affect front wheel alignment cos they refer to the rear wheels.</p><p>if the rear axle is off-centre, the car will crab.</p><p></p><p>[ATTACH=full]42452[/ATTACH] </p><p></p><p>so we centre the rear axle to the chassis (adjust panhard till the rear wheel rim to wheel arch lip are equal both sides)</p><p></p><p>[ATTACH=full]42449[/ATTACH] </p><p></p><p>then point the rear axle straight towards the front wheels by adjusting my whiteline trailing arms till the rear wheel lasers are both pointing the same distance away from the centre of the front wheels (not the forward/aft section of the front wheel cos that changes with steering angle)</p><p></p><p>[ATTACH=full]42443[/ATTACH] </p><p></p><p>with the rear axle centred n straight, front wheels on turn tables and the steering wheel locked pointing straight, we can begin straightening the front wheels</p><p></p><p>[ATTACH=full]42445[/ATTACH] </p><p></p><p>adjust the trackrod ends till the lasers pointing dead straight at the correct distance away from the rear jig.</p><p></p><p>[ATTACH=full]42444[/ATTACH] </p><p></p><p>when the front wheels are dead straight the lasers should be pointing 41.5mm from the rear wheel jig (laser emitter to base offset + front/rear wheel offset)</p><p></p><p>[ATTACH=full]42446[/ATTACH] </p><p></p><p>now if we wanna apply any additional toe in/out from the "Straight" position we calc how far the laser should point away from that.</p><p></p><p>because the laser and wheel rim are actually offset from the kingpin steering axis we need to calc this offset (kingpin to rim offset + thickness of jig + height of laser = 184mm)</p><p></p><p>[ATTACH=full]42451[/ATTACH] </p><p></p><p>first calc is how far away from the "straight reference" the laser should point (offset from straight position)</p><p></p><p>[ATTACH=full]42447[/ATTACH] </p><p></p><p>but the wheel & laser jig actually pivots via the kingpin steering axis and this induces an additional offset distance</p><p></p><p>[ATTACH=full]42454[/ATTACH] </p><p></p><p></p><p>so the total offset distance on the ruler that the laser should be pointing for any toe angle is (41.5 + offser from straight position + extra offset)</p><p></p><p>[ATTACH=full]42450[/ATTACH] </p><p></p><p>plotted the calculations and seems to be a linear increase per toe angle</p><p></p><p>[ATTACH=full]42453[/ATTACH]</p></blockquote><p></p>
[QUOTE="pollyp, post: 564358, member: 4527"] before i align the wheels tomorrow I I'll need to plan the method and calculate what readings to aim for very first step is to place her on a level platform, apply my body weight ballast in drivers seat and adjust tyre pressures till the rim to floor distances are equal cos each tyre has slightly different tread depth and sidewall stiffness. I've measured the front & rear tracking to find the offset distance 20.5mm between the front & rear wheels. the wheel base is also 2350mm [ATTACH=full]42448[/ATTACH] now we need to align the rear axle first cos due to the panhard rod of a solid beam axle, it could be shifted laterally offset relative to the chassis & front wheels. This could affect front wheel alignment cos they refer to the rear wheels. if the rear axle is off-centre, the car will crab. [ATTACH=full]42452[/ATTACH] so we centre the rear axle to the chassis (adjust panhard till the rear wheel rim to wheel arch lip are equal both sides) [ATTACH=full]42449[/ATTACH] then point the rear axle straight towards the front wheels by adjusting my whiteline trailing arms till the rear wheel lasers are both pointing the same distance away from the centre of the front wheels (not the forward/aft section of the front wheel cos that changes with steering angle) [ATTACH=full]42443[/ATTACH] with the rear axle centred n straight, front wheels on turn tables and the steering wheel locked pointing straight, we can begin straightening the front wheels [ATTACH=full]42445[/ATTACH] adjust the trackrod ends till the lasers pointing dead straight at the correct distance away from the rear jig. [ATTACH=full]42444[/ATTACH] when the front wheels are dead straight the lasers should be pointing 41.5mm from the rear wheel jig (laser emitter to base offset + front/rear wheel offset) [ATTACH=full]42446[/ATTACH] now if we wanna apply any additional toe in/out from the "Straight" position we calc how far the laser should point away from that. because the laser and wheel rim are actually offset from the kingpin steering axis we need to calc this offset (kingpin to rim offset + thickness of jig + height of laser = 184mm) [ATTACH=full]42451[/ATTACH] first calc is how far away from the "straight reference" the laser should point (offset from straight position) [ATTACH=full]42447[/ATTACH] but the wheel & laser jig actually pivots via the kingpin steering axis and this induces an additional offset distance [ATTACH=full]42454[/ATTACH] so the total offset distance on the ruler that the laser should be pointing for any toe angle is (41.5 + offser from straight position + extra offset) [ATTACH=full]42450[/ATTACH] plotted the calculations and seems to be a linear increase per toe angle [ATTACH=full]42453[/ATTACH] [/QUOTE]
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