So this is a pull I did out at the track and just watch the gauges. Goes 26 to like 18psi.
I did a boost leak but couldn't find anything, why isn't it holding close to 26 psi? Its a evo 9 turbo.

http://www.youtube.com/watch?v=K8hN9VhXqaM

Im #523

 

def a boost leak, did you do the test properly??

 

Could the wastegate be going bad?

Found the how to under the first link lol..

https://www.evolutionm.net/forums/ev...g-how-why.html

 

Ug I think its just a weak wastegate? :| upgrade to the 25 and see if it stops? lol

 

Ya man, it is the wastegate most likely. Remember the stock IX turbo won't hold 26psi out the top but should be able to hold 22+. Throw a 25psi wastegate on there, but don't pre-load it to much or you will get bad overboost.

Mikey

 

Why not try to pre load your current WG a little more if it has adjustment room to see if it holds any better.

There was also a post somewhere where a guy used springs to help get more holding pressure from the stock waste gate. it went from the rod connection point to the flange of the WG body.

I think the stock waste gate is only rated at 11psi.


Athanasios

 

im going to be trying a 25 psi wastegate. that would probably take care of the problem

 

I have a 18psi FP wga. loaded all the way. not helping

 

Take the turn buckle off, remove the nutt, and cut three threads off and then you will have plenty of preload. That is what I did.

Mikey