here is the question , temps cooled down in my area to low 50's high 40 ' ( Illinois ) and I am getting ready to go to the strip for last time this season , I did some runs on the street ( still tunning my XFI after new build motor installed ) and I noticed that my tune timing even where is set to 18 deg. at 20 PSI it was logged at 21 deg , this is due to the fact that my XFI tune from Cal is adding more timing if the intake temps fall under 80 F ,they did fall to 74 F on these few runs sooooooo........I have 0 knock ,this is 93 octane tune only I am working on at this time so it looks like I could get some more power if I do what ???? turn up timing or use fixed timing and turn up boost , what's getting the JOB DONE MORE BETTER guys ,timing or boost I was reading here that smaller turbos react better to timing and bigger like mine like more boost , is that right for any octanes or we talking race fuel only ? and is it true that the outside air has to be in the 50's to make max power on turbo engine ?