What's the cap to AI behavior modifiers (ambitious, zeal, etc.)?

[RelVleDy]

I like to groom very ambitious characters so the AI is more likely to declare war on others. This means having high ai_ambition. I noticed by conventional means, it's impossible to reach 100, even with all the ai_ambition giving traits:
+40 Ambitious
+15 Greedy
+10 Stubborn
+10 Proud

But what if I mod these traits, or add others to increase ambition? What is the cap? 100? 255? 1 billion?

 

[Arsonik]

I'm going to guess it is somewhere between 69 and 420.