05-12-2020, 09:52 PM | #1 |
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Ohlins R&T Preload Question
I have 18" Forgestar wheels with OEM +29 offsets and RE71r 275/35/18 tires - front. Zero issues on these on stock suspension. I installed the R&T's to spec and everything was fine except the front ride height increased by about 1/4". I lowered the setup to achieve a minor drop from stock and the tire is hitting the lower spring perch - even with a 10mm spacer.
To make stuff work, I'll need to increase the preload by 1/2 to 3/4" or get a shorter spring. Spec is 5mm. I am determined to give as much room as possible for more tire. I'd really like to stuff a 295 up front at some point. There's a ton of space below the perch if the space can be made. If I add preload to say, 20mm+, will there be any determent to handling. I honestly don't understand how dynamic vs linear spring rates work. Please help.
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'18 M2 - Alpine White - 6M
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05-12-2020, 10:12 PM | #2 |
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This page helped me understand some basics a while ago when I was installing and setting up my suspension.
http://www.superstreetonline.com/how...-gotten-wrong/
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Fun/HPDE: 2023 M3 6MT Individual Malachite
Past:2023 M4 CSL, 2022 M4C Vert, 2020 M340i, 2018 M2, 2015 M235i, 2008 135i 550whp Daily: 2023 X5 45e Daily/Family: 2021 Atlas Cross Sport 3.6 |
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05-13-2020, 05:41 PM | #4 |
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I did get some contact on the spring and perch with Cup 2 tires 255/35-19 on OEM wheels.
Ohlins with 70nm springs at 5mm of preload. I am not sure I have enaugh preload since I can easily rotate the spring by hand have some noise when reversing and turning the wheel.
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Fun/HPDE: 2023 M3 6MT Individual Malachite
Past:2023 M4 CSL, 2022 M4C Vert, 2020 M340i, 2018 M2, 2015 M235i, 2008 135i 550whp Daily: 2023 X5 45e Daily/Family: 2021 Atlas Cross Sport 3.6 |
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