Another boost question

[351wcoupe]

When driving amanda's car this morning(it was really cold) I have the boost set at 17psi and rolling 3k rpms in 3rd I went WOT and the boost smacked 20psi and the fell right to 17. Does anybody else have the happen. After it warmed up It didn't happen.

Was this due to the TC intercooler being "ice" cold?
What about the gillis valve being cold?

 

[Stinger]

Yes, sometimes you will get a slight boost spike before the spring in the Gillis valve warms up.

Stinger