it is possibble to change the years per turn,
but its not so simple.
if you changed them it effects by era and game speed.
look- into the gamespeed xml in your civ game files it looks like the fallowing code
Not sure we're the era coding effects it. But this is for the gamespeed
Code:
<GameSpeed_Turns>
<Row>
<GameSpeedType>GAMESPEED_MARATHON</GameSpeedType>
<MonthIncrement>180</MonthIncrement>
<TurnsPerIncrement>100</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_MARATHON</GameSpeedType>
<MonthIncrement>120</MonthIncrement>
<TurnsPerIncrement>300</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_MARATHON</GameSpeedType>
<MonthIncrement>60</MonthIncrement>
<TurnsPerIncrement>170</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_MARATHON</GameSpeedType>
<MonthIncrement>24</MonthIncrement>
<TurnsPerIncrement>201</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_MARATHON</GameSpeedType>
<MonthIncrement>12</MonthIncrement>
<TurnsPerIncrement>129</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_MARATHON</GameSpeedType>
<MonthIncrement>6</MonthIncrement>
<TurnsPerIncrement>180</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_MARATHON</GameSpeedType>
<MonthIncrement>3</MonthIncrement>
<TurnsPerIncrement>264</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_MARATHON</GameSpeedType>
<MonthIncrement>1</MonthIncrement>
<TurnsPerIncrement>156</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_EPIC</GameSpeedType>
<MonthIncrement>300</MonthIncrement>
<TurnsPerIncrement>140</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_EPIC</GameSpeedType>
<MonthIncrement>180</MonthIncrement>
<TurnsPerIncrement>90</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_EPIC</GameSpeedType>
<MonthIncrement>120</MonthIncrement>
<TurnsPerIncrement>40</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_EPIC</GameSpeedType>
<MonthIncrement>60</MonthIncrement>
<TurnsPerIncrement>90</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_EPIC</GameSpeedType>
<MonthIncrement>24</MonthIncrement>
<TurnsPerIncrement>70</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_EPIC</GameSpeedType>
<MonthIncrement>12</MonthIncrement>
<TurnsPerIncrement>100</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_EPIC</GameSpeedType>
<MonthIncrement>6</MonthIncrement>
<TurnsPerIncrement>220</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_STANDARD</GameSpeedType>
<MonthIncrement>480</MonthIncrement>
<TurnsPerIncrement>75</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_STANDARD</GameSpeedType>
<MonthIncrement>300</MonthIncrement>
<TurnsPerIncrement>60</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_STANDARD</GameSpeedType>
<MonthIncrement>240</MonthIncrement>
<TurnsPerIncrement>25</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_STANDARD</GameSpeedType>
<MonthIncrement>120</MonthIncrement>
<TurnsPerIncrement>50</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_STANDARD</GameSpeedType>
<MonthIncrement>60</MonthIncrement>
<TurnsPerIncrement>60</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_STANDARD</GameSpeedType>
<MonthIncrement>24</MonthIncrement>
<TurnsPerIncrement>50</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_STANDARD</GameSpeedType>
<MonthIncrement>12</MonthIncrement>
<TurnsPerIncrement>120</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_STANDARD</GameSpeedType>
<MonthIncrement>6</MonthIncrement>
<TurnsPerIncrement>60</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_QUICK</GameSpeedType>
<MonthIncrement>720</MonthIncrement>
<TurnsPerIncrement>50</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_QUICK</GameSpeedType>
<MonthIncrement>480</MonthIncrement>
<TurnsPerIncrement>30</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_QUICK</GameSpeedType>
<MonthIncrement>360</MonthIncrement>
<TurnsPerIncrement>20</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_QUICK</GameSpeedType>
<MonthIncrement>240</MonthIncrement>
<TurnsPerIncrement>30</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_QUICK</GameSpeedType>
<MonthIncrement>120</MonthIncrement>
<TurnsPerIncrement>25</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_QUICK</GameSpeedType>
<MonthIncrement>60</MonthIncrement>
<TurnsPerIncrement>40</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_QUICK</GameSpeedType>
<MonthIncrement>24</MonthIncrement>
<TurnsPerIncrement>65</TurnsPerIncrement>
</Row>
<Row>
<GameSpeedType>GAMESPEED_QUICK</GameSpeedType>
<MonthIncrement>12</MonthIncrement>
<TurnsPerIncrement>70</TurnsPerIncrement>
</Row>
</GameSpeed_Turns>
these will change the years per turn
these changes will be per era and gamespeed though