Excellent...

I agree. Perhaps on the next version you could add a field that notes that using Turbo Points increases the heat threshhold?

Good idea. I've just uploaded v2 of the document which includes a note about Turbo points and page numbers for handy quick reference.

As discussed in the Rules Forum, this Reference Sheet has an error:
when you Side Ram another racecar, you only roll ONE die. There are no different "to hit" and "to damage" rolls.

That only one die determines two things. First, if the defender is pushed (with 4 or more). Second, if a car is damaged (checking the table). But it is the same roll for both things. For example, if you roll a 3, you fail pushing the defender, but no one suffers damage.

Spelling mistake: care instead of car