my last nights track times where bad

ok i dunno what happend to my low 17s i was doin and now im doin high 18ish to low 18ish i dont get whats up......

what could effect my times and such i mean i just did a tune up and added pulleys and etc if more details needed let me know ill provide them

Could have just been the weather.

when is it a right time to go out on the tracks? does anyone know?

Most vehicles run better in mild to cool temps and low humidity. Some are different, but I know our race car likes cool weather and low humidity. It will slow down almost a tenth in hot weather. So after dark would be the best I would think. Atleast for our car (it is not stock though, so it may react differently)