is it bad to run without the upper timing belt cover?
i know theres a greater chance of getting dirt and dust in there, but i think i might be getting adjustable timing gears for xmas, thought itd be cool to show em off, if its not a major issue.
Personally, I would leave the cover on to protect the spinning belt and sprockets from foreign objects and/or liquids that could possibly do some damage. Also, all timing belts should be kept dry and free of oil and other contaminants. Timing chains require an oil bath for lubrication.
I see your in Edmonton ... will you be driving the Supra in the winter??? If you are (I have to drive mine... ) you will definatly want to have that cover on. Salt and Sand are hell on any kind of bearings or seals. Why not just take off the cover when going to shows on nice sunny summer days???