How much increase in boost can you expect with cold weather? I noticed that my car was boosting 1.5psi higher this morning than it was at same setting yesterday afternoon.

 

It's all to do with temperature and the density of the air mate. As you have found out the car is going so much better when its cold. Come the summer it may well seem to behave like a slug at times. Just don't want to go. Enjoy it while it last. Summer's on its way.

 

yep in cold air my car peaked at 16.5 psi but dropped to about 15psi normally it peaks and 14.7 and holds at about 14.5

 

Get auto intercooler water spray...the water mist will help you get more boost in warmer temps. Also, water injection is trick if you're wanting to run higher boost.