blackscorpio

OK upon recent purchase of a boost gauge i noticed i was getting 0 psi of boost, since then i replaced all couplers and have been getting a steady 2 psi of boost. I get a dip in the boost at thee transition point like a
2-0-2 boost pattern.
Recently I swaped my stock exhaust for a 3" cat back so that someone could pass inspection, and suprise suprise I now have 3psi max boost.
Now here is my question. Could the low boost be due to an airflow problem on the exhaust, such as a clogged precat or a clogged main cat? Anyone have any other suggestions.

blackscorpio

^

Street King

You shouldn't get a dip because it doesn't swithc over from primary unless you can build 8 psi.

blackscorpio

Well it does dip, dunno why, No I never went non seq. Got another FD and im going to go single on it. Probaly gonna just sell this one.

P'cola FD

If it switches to the secondary turbo, then it is making over 7 psi. It's just not getting to the manifold. You may have a boost leak somewhere else. Hook up a boost gauge to the nipple coming off the y-pipe to see how much boost the turbos are really making.