When you put the t-stat in backwards it makes the hoses bigger? It makes the water pump turn faster? How does it allow additional flow? Also if the spring is on the radiator side how does it ever open? How does the car disipate the heat from the coolant block? Please help me understand as I am just simple folk that don't understand fancy foreign cars.
Assuming that you actually want to know, I will explain how the system works. I put the pages from the FSM on a web site here:
If you look at the diagram, you will see that the thermostats actually has two parts; one in the return line from the radiator to the block, the other in the by-pass flow-path from the block to the water-pump inlet. The thermostat is not installed in the supply to the radiator like most american cars.
When it is cold, the return from the radiator is closed and the bypass line is open. As the thermostat heats (starts opening at 80C, fully open at 95C) it opens the return line from the radiator and closes the bypass line. As you can see from the diagram, installing it backwards would allow flow through the radiator return line all the time (sorta like running an american car with the thermostat completely removed).
When mine was installed backwards, the engine temperature would not get above 60C in cold weather, it's supposed to run between 80C and about 95C. I doubt the OP has a similar issue on his car, but I was just trying to point out that not all cooling systems are designed the same way.
The actual thermostat looks like this:
Hope that helps.