Quote:
Originally Posted by alpinewhite3
Couple of main takeaways -
Never run above 40psi in any 18-19 inch performance tire. The ideal grip "band" is between 32-38psi for most performance tires. If you go beyond 40psi, you may end up with a tire that feels better since you are greatly enhancing steering response at the expense of overall grip.
BMW recommends 32F 38R on their RWD 330i b/c their #1 goal is safety (from a liability perspective). My best guess is they recommend 38 on the rear b/c a higher pressure in the rear will prevent the sidewall from flexing too much and greatly prevent the car from oversteering. 32 on the front will keep it squarely planted at the limited with max grip available. I'm sure the toe/camber settings are calibrated to prevent oversteer too.
I like to run 34-35 front 36-37 rear. 2 PSI difference.
I found the 32 front made the steering a bit too dull. 38 Front is super sharp but i can feel the lack of grip. 34-35 is a happy medium.
38 rear is too high (a tiny bit too much center tire wear) so i run 36-37.
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Agree fully they want to prevent oversteer. All manufacturers want the cars they sell to the masses to understeer at breakaway because that is MUCH easier to control by slowing which is what 99 percent of people do just due to natural reaction which then allows them to control the car again.
Interesting on the recommended 38 rear though on the 330. Also agree they want to the car firmly planted but wow, 6psi difference is a lot if you ask me.
Once Spring comes I will try some different psi's and let you know. Thanks for the info.