What happened?!

I went to the track last night and was greatly disappointed with my car. I made four passes and did terrible. It didnt help that i was sleeping at the tree most of the night, not to mention got frustrated with the times i was running.
1st pass--- against 01 Trans am 17.4 with .577 R/T
2nd pass--- against skyline R32 17.3 with .368 R/T
3rd pass--- against 92 Lightning 17.6 with .451 R/T
4th pass--- against 00 Accord 17.7 with .666 R/T

Can somebody tell me whats going on? Has anyone else been that slow with a V6 Alero?