Quote:
Originally Posted by jakou
Hey guys, this is my 1st post.
I have recently bought a new 2016 320i Sport Line and immediately swapped the stock run flat tires with new Michelin Pilot Super Sport ones because I don't like the run flats noise and harsh ride. As expected the Michelins turned out to be really comfortable however, in many instances when putting my foot on the throttle I am experiencing a higher than expected wheel spin on the rears. This is happening at rather low speeds when accelerating a bit on corners or when pulling away. I expected the Michelins to be grippier and I am surprised that they actually are not. I was hoping that after a break in period grip would become better but after already 500km on the tires I haven't noticed any grip improvement. I have also tried lowering psi on the rears from 35 to 32 but no improvement either. I searched on the web regarding this, but I didn't get a really satisfaying answer. Hopefully someone can shed some light and give me a convincing explanation.
My set up is 225/45ZR18 95Y Extra Load in the front and 255/40ZR18 95Y Standard Load in the rear (The rears are not available in Extra Load in my area so I had to settle for Standard Load, but as far as I know it is OK to mix Extra Load with Standard Load). Pressure is 32psi for the fronts and 35psi for the rears, as specified on the car door label.
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It could be a bad lot of tires. I can't image Michelin screwing up but anythings possible I guess.
Also, did you look under the hood. Maybe BMW stuck an M3 S55 motor in there by accident.