Why does my boost vary from day to day?

[HyperGSX]

depending on the weather i will hit 10psi, when its warmer out i hit only 8psi. i have a mbc which is completely open. i know the temperature has something to do with it, but isnt stock boost like 11-12psi, why is mine so low on warm days?

 

[Tallen]

Temp, density, pressure.

 

[sonicnofadz]

Your boost levels are heavily affected by changes in the environment (particularly the air). When it is cooler out, the air is more dense, and your turbo can suck in a much denser charge which shows up as a higher boost pressure on your gauge. I think this is pretty normal.

 

[HyperGSX]

but why am i hitting lower than stock boost ?

 

[sonicnofadz]

Hmm I am not sure why you are getting below stock boost...depending on your elevation, the density might be low enough to cause this type of effect...ALSO you may have a boost leak. Do a boost leak test to see if your intake tract has a leak.