When I floor it, my boost gauge shows that i am boosting 3 or 4 psi. My deltagate is a 7-9 psi spring. What can cause low boost?

 

boost leak!! check your piping

 

what do you do to check for leaks? thanks.

 

Check all the connections on your charge piping. If they are all tight check the vacumn tube that goes to your boost gauge. If it is kinked it could give you a lower reading than what you are actually boosting. When I put my turbo on, my piping was really loose. My gauge read 2 psi and then at one point 0.

 

Well, right now, on my boost gauge, shows -20 at idle. Does this sound right? My friend's shows the same at idle and when he boosts, it shows 5 psi, which is what his spring is at.

 

probaly leak through your intercooler. same thing happen to me but my 7 psi spring went to 5 psi. then i turned the boost up with a boost controller