Speed has less to do with that than the amount of gasoline being converted into energy, some of which is obviously heat. Higher speeds actually cool the engine a bit quicker, but it takes more power (and by extension, more gasoline converted to energy) to get to higher speeds. If you were to coast down a steep hill, the speed would require less power and thus cool the engine more.
I don't know if it's a bug or something but when i drift on one direction for a long time example: right. The front wheels just detach from the car, I'm not complaining! I found this funny and caught me by surprise when it happened. Please don't fix this. In a more serious note, the mod is very good --- Post updated --- Oh, and also there's no engine sound. But that's fine with me
If you go to page 3 there's a hotfix for the sounds, and the wheel bug will most likely get fixed because it will get irritating after a while if not straight away
https://www.modsgaming.us/index/8-343 is the guy who posted it, what a righteous little prick (EDIT) i went to his "mods" page and theres so many stolen mods
Basically the same archetype as him, a Russian with broken English who posts mods on a Russian website taken from here.