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SVT Shelby GT500
Is it Me, or the Car? Tracking and Stability
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<blockquote data-quote="RedVenom48" data-source="post: 15983733" data-attributes="member: 166576"><p>#1 super important: make DAMN sure the disc brake installation washers are REMOVED from the brake rotors. These little washers are installed during assembly to keep the rotors on the hub. They are NOT removed from the car after production. All Ford OEM wheels have a machined out section around each lug hole to accommodate them. Aftermarket rims do NOT. Take to a tire shop immediately, have them pull the wheels and inspect each rotor to see if they are on. Take all of them off. Since you have had low mileage GT500s, the rotors may not have ever needed to be removed, and a tire shop may not know to remove them for aftermarket wheels.</p><p></p><p>If they are left on and an after market wheel is installed, the wheel will bolt on, and stay torqued, but will always have a small wobble. this could upset the car like how youre feeling.</p><p></p><p>Lets assume that the washers are not on the car. I spoke with a seasoned technician I work with, hes not a fan of the centerlines not matching up like in your diagram. Fine for drag racing wheel setups, but on the road the centerlines should be closer to in line than not.</p><p></p><p>A proper alignment machine *should* be able to compensate for minor differences in wheel size. That said, I have a few different tire size options I need to input on LS, IS and GS Lexus cars when I align them.</p><p></p><p>Thrust angle is still displayed on alignment readouts. But here's a tip: if your rear axle flanges arent DEADNUTS straight, the alignment machine will pick them up as either camber or toe, depending on how the axle is rotated. There is no spec to what is an allowable on the machine, but perhaps in the manual. That wobble could cause an unstable sensation in a low profile tire.</p><p></p><p></p><p>Id bet that its the combo of 20" Foose wheels and the tires that are on there, and possible rotor washers left on.</p><p></p><p>Id get those Fooses off asap and put the factory ones on with some good street rubber (Michelin, Bridgestone etc). Even with factory wheels going back on, get any rotor washers off!</p></blockquote><p></p>
[QUOTE="RedVenom48, post: 15983733, member: 166576"] #1 super important: make DAMN sure the disc brake installation washers are REMOVED from the brake rotors. These little washers are installed during assembly to keep the rotors on the hub. They are NOT removed from the car after production. All Ford OEM wheels have a machined out section around each lug hole to accommodate them. Aftermarket rims do NOT. Take to a tire shop immediately, have them pull the wheels and inspect each rotor to see if they are on. Take all of them off. Since you have had low mileage GT500s, the rotors may not have ever needed to be removed, and a tire shop may not know to remove them for aftermarket wheels. If they are left on and an after market wheel is installed, the wheel will bolt on, and stay torqued, but will always have a small wobble. this could upset the car like how youre feeling. Lets assume that the washers are not on the car. I spoke with a seasoned technician I work with, hes not a fan of the centerlines not matching up like in your diagram. Fine for drag racing wheel setups, but on the road the centerlines should be closer to in line than not. A proper alignment machine *should* be able to compensate for minor differences in wheel size. That said, I have a few different tire size options I need to input on LS, IS and GS Lexus cars when I align them. Thrust angle is still displayed on alignment readouts. But here's a tip: if your rear axle flanges arent DEADNUTS straight, the alignment machine will pick them up as either camber or toe, depending on how the axle is rotated. There is no spec to what is an allowable on the machine, but perhaps in the manual. That wobble could cause an unstable sensation in a low profile tire. Id bet that its the combo of 20" Foose wheels and the tires that are on there, and possible rotor washers left on. Id get those Fooses off asap and put the factory ones on with some good street rubber (Michelin, Bridgestone etc). Even with factory wheels going back on, get any rotor washers off! [/QUOTE]
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Is it Me, or the Car? Tracking and Stability
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