First off, excellent designs. I am particularly impressed with the 'TUNE' text designs. The red-orange-yellow fade looks wonderful, however I'm interested in seeing it in in blue.
Wow, that was incredibly fast. I like it in blue too. I'm going to take a moment to take it in and think about how modification could improve on it - but It's hard as It's very good already! Maybe there is a suitable way in incorporating elements like tiresmoke (clouds), tires, turbochargers or motorsport in some way. I'll comment when I've had an idea! Good work!
Referring to entries #19 and #14, perhaps the X looks too much like a K? Also, these in the red-orange-yellow fade character of entry #8 could be better. Thanks! Very good! Andy
Also, the colour behind/around the 'TUNE' lettering is awesome on #19 and #14. Especially #14 , perhaps this could be incorporated with your other higher ranked designs?
Perhaps we could see some automotive touches on design #8 , could the arch be detailed with incremental light and thin marks making it look like a gauge?
#59 is great, additionally the 'redline' red and black streaks of #60 are also great elements. Perhaps the black arch on #59 past the X (where it is not segmented by the markers) could be edited with a slight tire tread effect?