Rocking in a turn

["Vadim Dubinsky" <dubinsky@xxxxxxxxxxxxx>]

...not in a musical sense, but physically what the car is doing in a
fast sweeper.

I'm sitting there hauling my a$$ around in Grand Turismo and notice a
familiar sensation.  In a long sweeping turn the car begins to rock and bop
side to side.  I'm thinking "hey, this is like for real!  I've felt this
before driving a real car, on a real road."  So now I have a few questions
about this, some theories and would like to hear your advice and thoughts on
this.

First of all, what is all that could be causing this?  I suppose a number of
things -- jerky turn of a wheel, a stab of the gas pedal, uneven pavement at
the beginning of a turn, etc., but the most likely reason I suspect is an
exceeded slip angle of my wheels.  I guess my tires are loosing traction and
slide sideways, but why aren't they sliding in a smooth fashion?  Why does
it feel like they bite...release...bite...etc?

How can this be avoided in the first place?  Am I simply going too fast in
the corner and need to slow down before the turn in?

What should I do and should not do once this starts happening?  Should I
just ride it out without lifting or more steering?  I'm guessing lifting or
braking would be the worst thing to do in this case.  I don't really know.


Driving on the street this is most pronounced in my '84 Accord, where shock
absorption is a distant memory (I really need to replace those [original
165K mi.] shocks).  I have also experienced this in my '97 M3 (obligatory
content), but not as bad.

Thanks for your thoughts,

Vadim

------------------------------

End of bmw-digest V9 #465
*************************