Just what I thought.

But what's the difference betweem low and high param. every time I only tweak this, the car makes wheelies. I did high and low param x2(doubled)

Madness city 2 disabled the water mod and some other city's
you must rename the watermod.
the normal name: city.ar just rename it to !!!!!!!!!!!!!!!!city.ar
It works for me!

It works but, how can you tune the trucks(cops)?
example: more speed