[Torcs-ng-devel] "Realistic Data" physics for car2-trb1 - Optimised for SimUV3

[Haruna S. <ato...@gm...>]

Hi all,

After about two or three weeks with much testing, I decide to release a
physics change for car2-trb1,
one of my favorite cars. It's suspension, aerodynamics, and tyres have gone
through some major
revisions in order to make the driving more realistic.

WARNING: SIMUV3 _ONLY_!!!!!!!!!!!!!!!!!!!!!
 The car setup and physics are built entirely around SimUV3, DO
_NOT_ DOWNLOAD THIS IF YOU
ARE _NOT_ USING SIMUV3.

Okay, warnings aside, here's some notes about the new physics.

Aerodynamics:
The front and rear Clift values have been increased to 0.775 all-round,
which should produce much
greater downforce without wings. Angles of the wings are set up in such a
way that the car has a lot
of rear-end grip (4/16 front/rear).

Suspension:
You can now lower car2-trb1 to 50 mm, though for very, very obvious reasons
that's a bad idea.
The suspension is also much softer than before, to reflect on real-life GT
cars' data. Bellcrank is also
increased to cope with both the softer suspension and the lower ride height.
By default, the setting for
ride height is 75 mm front and 90 mm back, because of the softer back and
greater mass in the rear.

Do note the slow/fast bump and rebound: rebound is almost always double of
bump. Using the "old"
setup of bump and rebound makes the car really unstable.

Tyres:
The stiffness is decreased for a slightly more dynamic cornering, without
compromising the realism
too much. Dynamic friction is also increased to a full 100%, to increase
forgivingness under cornering.
Also, the friction is lowered by 0.2, to give drivers less leeway about
flooring the throttle... you now
have to feather your way through a curve or else say hi to the armco.
Through the setup you can also
define the tyre pressure, like in the SuperCars set.

Others:
The weight distribution changed to 45% F / 55% R to increase that Porsche
feeling.
Bigger piston area for rear brakes.
Maximum value for brake bias 0.85 because of handling nature under too much
rear braking. The default
is set to 0.7.

General Notes:
Front is stiffer than the front for some understeer... I kept in mind that
noobs should not have too much
of a hard time handling the car, but that more experienced drivers should
also have some fun with the
default setup if they are new to a track.
To fully enjoy / get frustrated, play on pro mode. Amateur is for total
n00bs ;), and Semi-pro just isn't
fun.
The car is not balanced with others.
I changed the name to "Stuttgart 961 TRB".

Download:
 http://www.filefactory.com/file/agb7954/n/car2-trb1-realistic-test_rar

Enjoy!
Haruna.