Torchs powers won't affect Sunfire as long as Sunfire is using his own though. Sunfire has a psionic shield that protects him from all the effects of his own heat and others. So unless Torch catches him by surprise Sunfire should be unaffected.
while im not an expert on Torch its been explained to me, that torch sorta has icemans abilities (very limited and opposite) in that he can excite the molecules, and have complete control of all molecules around him and his body, becomes purely fire (is that true???), and has more powers that only Wynndar could explain...but he can be really impressive with how he can control his powers in ways that are more than just blow stuff up...