How can you tell if there is a boost leak, will the boost gauge act funny, or any other sign, my car doesn't feel fast anymore

 

if your turbo spool but you cant build boost then you got a boost leak.

 

look at the boost gauge, and if you don't build any boost, you can definately hear it, plus the gauge will not read about 1 psi

 

If its just a small boost leak, you will have a hard time telling. With a tiny leak you will most likely still hit your normal boost level, but your turbo will have to work harder to do it. A lot of times putting it out of its efficiency range.

Only sure-fire way is to test it. You can build a cap with a check valve for the turbo-side of your charge pipe, and pressurize it with an air compressor. Its not perfect, but you can sometimes hear tiny leaks if your lucky.

 

Check your boost gauge

 

When I look at the boost gauge it will hit max boost then drop back down as soon as let off the accelerator, is that normal or is that a sign of a boost leak.