If you run it on the "slightly" rich side and make sure it has plenty of air for cooling you really don't need to worry about temp #'s The problem with temp #'s is that it only really matters when you are pulling hardest in the air, can't use any IR gun for that. You could use a data logger, but why. Unless you are really into competition or just like to tinker. I guess we all like to experiment in this hobby though.

Now that I read your original question again I believe this should go into the "cars" forum.
Oh by the way what is a 1/5 scale onroad? Buggy/Car? Showing my ignorance now. Tuning by the ear is a great way to set up engines if you know what you are hearing.


Ralph