nitro is a cooling agent, it'll actually cool the engine running a higher percentage. the higher RPM you can gain using it can raise temps due to friction but it's no different then running a lower prop load. the TT engines run great on the 30% nitro, But in high temp/humidity environments like we have here in South Alabama you need to shim the head to lower the compression a bit because of the 22% oil content of the 30% can jack it on up..........

kc