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Boost Pressure Reading Low


Ready to race!
I was curious if you could help me think this through. I was driving my golf tonight and it was under 39f. I realized my boost guage was reading low while I was driving so I did a few pulls and couldnt exceed 14 or 15 psi max on the guage. I was normally getting 18 to 21psi previously when I would look.

The Fed

Old Guys Rule
I never tried measuring boost pressures in cold weather. If you have VCDS measure requested and actual and see what you get. Seems my last 2 GTI's were developing more power in cold weather with the same boost pressues because of the colder, denser air but I never looked that closely. I would think you would have less requested if the ECU is smart enough to take ambient and intake Temps into acvount. We don't have mass airflow sensors anymore.