stock twins
street port engine
simplified vacuum line
pfc
full exhaust
boost controller evc ez
99 spec y pipe

ok here is my issue


5 psi of boost only lol

i dont have any vacuum leaks....did it with a smoke tester


the prob plus a video

throughout my whole rev range i get 5psi boost at wot in all gears

http://www.youtube.com/watch?v=1PWKklZqGvg


please any comments or anything would be appreciated

and i have also searched these forums on what it could be....im a newb to turbo applications for cars my background is a aircraft mech

 

Not having a vacuum leak does NOT mean you dont have a boost leak. One of the most common places to get a boost leak, the corrogated pipes before the throttle boddy elbow never see vacuum, only boost.

Make the home depot boost leak testor.
http://forums.evolutionm.net/evo-how...er-5-02-a.html

Wastegate spring is 7psi so anything below that almost garantees a boost leak.

 

im going to try this today....hopefully this solves it

 

ok so i tried this.... and nothing...... and still 5 psi

anything else someone could suggest ?

 

Possibly a bad turbo pre-control solenoid.

When I was diagnosing a boost issue I had, one of the troubleshooting steps we took was to unhook the connector from the pre-control. Under these conditions I would not boost over 5psi.

I'm not promising that's the problem, but it is a symptom I had when I unhooked mine.

-Geoff

 

when my car was having low boost issues I switched out the turbo's for a lower mileage set and now it boosts fine...but I would do what Cloudpump says and check out the pre-control solenoid first.

 

thanks for getting back to me

ok, so a few things i should mention.

bought a set of turbo's... switched them over and it did the exact same thing.

my stock bov, does not work..but when i put it into my buddies car..it works just fine and when i put his on mine, it did the same thing. it has no type of blow off. I get some type of funny noise when i let off the gas well im in boost.

i had a hole in my gas tank from a amp install...that was fixed (and the company paid for everything even with rental car ) and it brought my boost up to 7 psi but brings it up slowly.

 

i had the hks evc ez hooked up and my wastegate and turbo control solenoids were disconnected

i just took it off today and still the same thing

 

ok this problem is solved! and for anyone that wants to know, i had to follow the simplified diagram, it turns out when i took my car in to do a smoke test they broke a 5 port T and didnt tell me... so i was looking around and following all the vacuum hoses and it was all fucked up in there lol they used 4 different 3 port T's and they also put the check valve in the wrong location..and backwards lol

so i put another 5 port t in there, and i put the check valve in the right location and now....and thank god that fixed it lol

thanks for your help everyone