Boost issue =/ Help please

piperottopiperotto Wagonist
in Engine & Drivetrain
hopefully someone here can offer some ideas....
my build
a6 block with z6 head
stock length golden eagle rods
cp pistons
.53 trim garrett t3/t4 turbo
hks electric boost controller
2" ic piping welded only 5 rubber couplings

It all started yesterday morning when I started my car after sitting for a day (and ill add it ran fine the last time it was out with no weird issues). Prior to me parking it, I had the exhaust uncorked for about 3 days and when i corked the exhaust back up it still worked fine until yesterday.... Anyways, I got in the car and after it was warm i noticed it was only allowing me to build around 5 psi of boost. I instantly looked to my boost controller (which i have to turn down when the exhaust is open as it likes to build more boost) it was right around 1/3 of the way max which is where it normally is. I turned the controller off, because this would utilize the 7 lb spring in it and i was only around 4 pounds of boost. so i turned the controller back on and cranked it up gradually. When it was on max the car would only build 7 psi of boost and even that feels sluggish.

I checked the turbo and it spun easily with little to no shaft play, then i looked into all of the piping and didnt find any leaks.. I dont know what else it could be as the car runs just like normal it just wont build boost.

Any ideas are appreciated.
Thank you,
Torey

Comments

  • lavoy1lavoy1 Banned
    is the waste gate working properly? can you take it apart to be sure its seating and not hanging open a little? have you ran on gate before and made 7? reason i ask is very very often a gates springs rating is not what it makes on ever application.
  • piperottopiperotto Wagonist
    Yeah normally it would run around 5-6 psi on my application with the boost controller off.. but now when the boost controller is on or off it is always running right around 4 psi
  • lavoy1lavoy1 Banned
    ok well you said it would do 5-6 and now its 4 1 psi is something just season change alone can cause. from spring to summer and back to fall i always have to adjust my controller to stay with a +- 1 psi consistency . if your only off 1 psi dont even worry about it . however your boost controller should be able to increase beyond 7 psi if its hooked up properly. just for testing try unhooking the line to the waste gate completely and doing a pull and see if it goes past 7 in theory it should keep making unlimited boost so make sure to keep a eye and not go to far but just see if it tries and go past 7 .
  • piperottopiperotto Wagonist
    The boost controller worked before and did for quite a while... I think the motor in the boost controller valve went out. =/
  • lavoy1lavoy1 Banned
    i just also noticed your using a electronic style controller, such as a pwm. these are very prone to fluctuate when temperature changes. i did a small video on this that goes into more specific detail bout the pro and con of different controllers. here is a link if you wanna watch it. http://www.youtube.com/watch?v=yJbQRhtagvM
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