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Stumbled on your build here and it's got me thinking twice about spring rates...
I'm about to go with YCW 1-way adjustable coilovers. I was originally shooting for the usual 1:3 front/rear spring rates (i.e. 6k/18k) to maintain the nearly 1:1 wheel ratio front/rear. But now reading that you have more like a 1:1.5 spring ratio with your 650/1100 I'm second guessing it. To add more confusion to the mix, when I emailed YCW asking for their recommendation based on my specs, they suggested 8k/18k or 1:2 spring ratio.
My car is going to be very similar to your build, similar weight 128i. You are at a higher skill level than I am, though.
Do you feel like the 650/1100 is a good fit now in terms of front/rear bias? Or if you could do it over again would you try to have it more rear biased?
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