Quote:
Originally Posted by eaglesrest
Tyre pressures? You're having a giraffe? Sorry but you're completely wrong.
I didn't have a problem with the rft's until I swapped them to non rft's for winter. There is a marked improvement.
I'm guessing you don't have any direct experience of the contrast to relate to otherwise you wouldn't have posted what you did.
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You are right in that I do not have the experience of "Changing from one to the other" however I have owned and driven (in the UK) cars with and without run-flats, yes they can be harder and more unforgiving depending on tyre pressures IMO.
I have test driven the M-Sport f10 at high speeds and found the steering in "Normal mode" light but not wandering, set up in Sport mode with steering and suspension ONLY, it drove great
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I have found on my M3 E90 setting up my tyre pressures different than recommended the cars handling has been transformed, prohaps trying a change of pressures just may solve your problems, however if I have the symptoms that many have described here, I would NOT have ordered the 550i M Sport at all.