I boost to 7 psi then it drops to 5. this happens in 2rd and some in 3rd gear. I just replaced my charge pipes and it still here. I figure next thing I should do is test if the setup can hold pressure. What else could do that? what about exhaust problems?

 

what size exhaust do you have? that could be causing some resistance.

 

my down pipe is very small I'd say 1-7/8". it was made at miduis

Nick

 

that would be the first thing to replace,use 2.5 inch at least.

 

turbo might be too small also. or wg vaccum isnt from intake manifold and your seeing some intercooler pressure drop. or a boost leak. or a ton of other possibilites. :/

 

What is the size of the turbo?

 

I should have stated all that info, it used to be in my sig.

d15b (jdm vtec)
td04 greddy turbo and manifold
small shitty downpipe.
greddy type 's' bov
Ford 310cc injectors controlled by fields.
DSM g1 intercooler

Thats a little more info then you needed.

 

Try removing the downpipe, and doing a test run.

 

good idea. thanks. that would answer the question very easily