“I wonder what will happen if I turn the car friction to -9...“
To do this yourself, go to GTAIV/common/data and edit your file, replacing the number for each car in the “wbias“ column to -9.
Be sure to backup the original should you want to go back to running errands for minorities.
Running with maxed out settings on:
i7 950
GTX 470
6 gigs ram
Staples mouse pad