boost creep
Registered User
Joined: Apr 2009
Posts: 522
Likes: 0
Originally Posted by 08s2000CRbackinblack,Jun 4 2010, 11:03 AM
https://www.s2ki.com/forums/index.php?showtopic=786991
you barely see it in the one pic. i just dont think its opening.
yes i pieced my kit together
you barely see it in the one pic. i just dont think its opening.
yes i pieced my kit together
Registered User
Joined: Jan 2008
Posts: 594
Likes: 0
Assuming you have correct boost readings, then its pretty simple,
1. If you anytime during the revrange see that the boostpressure is stable at 3psi or whatever the spring is, but increases at higher rpm, then the Wg opens ofcourse.
2. If the boost is directly climbing from 0 boost to 10psi, then the WG isnt working with you. I think we can narrow it down to those two at least.
If 2 is the case, time to examine the WG. (Did you try to push the valve manually with your hands to see that is runs nice and smooth? With a 3psi spring it should be no problem to push the valve with your thumbs.).
Did you mount the WG the correct way? (Stupid question
)
As a sidenot example:
I have had boostcreep on my homemade manifold but it holds 7psi(the springrate) until approx 8krpm where it starts to creep. WG works, but cant evacuate enough flow at the top end. In this case it comes down to manifold design.
1. If you anytime during the revrange see that the boostpressure is stable at 3psi or whatever the spring is, but increases at higher rpm, then the Wg opens ofcourse.
2. If the boost is directly climbing from 0 boost to 10psi, then the WG isnt working with you. I think we can narrow it down to those two at least.
If 2 is the case, time to examine the WG. (Did you try to push the valve manually with your hands to see that is runs nice and smooth? With a 3psi spring it should be no problem to push the valve with your thumbs.).
Did you mount the WG the correct way? (Stupid question
)As a sidenot example:
I have had boostcreep on my homemade manifold but it holds 7psi(the springrate) until approx 8krpm where it starts to creep. WG works, but cant evacuate enough flow at the top end. In this case it comes down to manifold design.
Registered User
Joined: Jun 2004
Posts: 4,712
Likes: 0
From: Phillips Ranch 909!
Ok I looked at your pictures and I definitely see a problem. That vacuum line that goes from your wastegate all the way across your firewall and then over to the cold side by the throttle body needs to come out!! That right there will cause all types of boost creep and erratic spikes. You want that line short and as close to the boost source if not right on the turbo.
At the very least, put the fitting on the HOT side after your coupler to turbo connection or simply tap the housing on the turbo and add a fitting there. (Ive seen it done both ways).
At the very least, put the fitting on the HOT side after your coupler to turbo connection or simply tap the housing on the turbo and add a fitting there. (Ive seen it done both ways).
Thread Starter
Registered User
Joined: Apr 2008
Posts: 1,189
Likes: 0
Originally Posted by TRBOKEV,Jun 4 2010, 11:51 AM
Ok I looked at your pictures and I definitely see a problem. That vacuum line that goes from your wastegate all the way across your firewall and then over to the cold side by the throttle body needs to come out!! That right there will cause all types of boost creep and erratic spikes. You want that line short and as close to the boost source if not right on the turbo.
At the very least, put the fitting on the HOT side after your coupler to turbo connection or simply tap the housing on the turbo and add a fitting there. (Ive seen it done both ways).
At the very least, put the fitting on the HOT side after your coupler to turbo connection or simply tap the housing on the turbo and add a fitting there. (Ive seen it done both ways).
my tuner said he will figure it out, i hope
