Physics Tutorial (GTA2)

Main Page > GTA2 > Modding Tutorial > Physics

---

The physics of GTA2 vehicles, like top speed, weight, resilience and manoeuvrability, are stored in the nyc.gci file in the GTA2\data folder. This tutorial explains how these physics can be altered. You may want to use a physics editor or a tool like the GTA2 PowerManager to do this, although it's also posiible to alter physics manually.

Make sure you've made a back-up of nyc.gci before you start changing the file. There is a high risk of creating uncontrollable cars, so you'll probably need to be able to restore the file without having to reinstalling the game. Also, note that you can't play multiplayer with someone who has a different nyc.gci file.

Most editors use easy scrollbars to alter physics. If you want to do it manually, you need to open nyc.gci with Notepad. You'll see a list of all cars with their physics. The first car, the Romero, looks like this:

{Romero}
0 {model}
0 {turbo}
50 {value}
0 {pad}
f16.500 {mass}
f1.000 {front drive bias}
f0.500 {front mass bias}
f1.750 {brake friction}
f0.145 {turn in}
f0.450 {turn ratio}
f1.250 {rear end stability}
f0.180 {handbrake slide value}
f0.152 {thrust}
f0.245 {max_speed}
f1.000 {anti strength}
f0.065 {skid threshhold}
f0.550 {gear1 multiplier}
f0.680 {gear2 multiplier}
f1.000 {gear3 multiplier}
f0.107 {gear2 speed}
f0.165 {gear3 speed} 

Every line is a physic (explained between { and } ) with it's value. This values can be changed, but don't remove the 'f' and insert values with three digits behind the decimal separator (0.000), except 'value' and 'turbo'.

The table below lists all values with explanation and their minimum and maximum value. Do not exceed this minimum or maximum!

Physic	Explanation	Minimum		Maximum
{Name}	Name of the vehicle
{model}	ID
{turbo}	Extra thrust (see 'thrust')	No turbo	0	1	Turbo
{value}	value	Cheap	0	999999	Expensive
{pad}	Unknown		0	0
{mass}	Weight	Light	1.000	35.824	Heavy
{front drive bias}	Steering	Middle	0.000	1.000	Front
{front mass bias}	Front weight	Light	0.000	1.000	heavy
{brake friction}	Changing forwards/backwards	Slow	0.000	4.000	Fast
{turn in}	Reaction speed	Slow	0.000	1.000	Fast
{turn ratio}	Corners	Wide	0.001	1.000	Sharp
{rear end stability}	Stability	Unstable	0.000	4.000	Stable
{handbrake slide value}	Handbrake	Weak	0.000	1.000	Powerful
{thrust}	Force	Weak	0.000	1.000	Powerful
{max_speed}	Top speed	Slow	0.000	1.000	Fast
{anti strength}	Vulnerability	Invulnerable	0.000	10.000	Vulnerable
{skid threshhold}	Skid marks	Often	0.000	1.000	Few
{gear1 multiplier}	Top speed backwards	Slow	0.000	1.000	Fast
{gear2 multiplier}	Extra speed 2nd gear	Slow	0.000	1.000	Fast
{gear3 multiplier}	Speed 3rd gear	Slow	0.000	1.000	Fast
{gear2 speed}	Speed backwards 2nd gear	Traag	0.000	0.600	Snel
{gear3 speed}	Speed 2nd gear	Traag	0.000	0.600	Snel