I heard this as well, and I think it's because since they have to strain the 12 turns so much to go fast that they're blowing up quite frequently. My guess is they'll go with a 10 turn rule like here in the US with ROAR.
USVTA Member #211
Yokomo BD7 (Mod TC), Corally Phi '07 (VTA)
Support Formula SAE - get kids into engineering!