BMW tire pressure study/analysis?

[BMWCCA1]

If you pump all 4 tires the same pressure, you will get understeer and car does not turn quickly. If you pump the front tires 4PSI lower than rear, then you will have sharp steering response.

Actually, conventional wisdom says decreasing tire pressure at the front relative to the rear will increase under-steer, and vice-verse: Refer to this tire pressure handling chart. I guess it all depends on what you mean by "sharp steering response".

[Tiger]

Mmm... strange... by lowering pressure, you should have more traction... so with front more grabby than rear... how is that understeer? Is it the rear tire understeer so that the front controls more?

And if you lower the rear tire presure... the rear wheel will steer the car more... thus oversteer?