15lbs spring in wastegate, but gauge reads 30psi+ *help*

mtcs · 10-30-2009, 08:22 PM

Ok,
so I got myself a little bit of a problem.
I am currently running a gt3071r with an external 38mm tial wastegate.

The spring in the wastegate is 15lbs. Not currently running a boost controller. So 15psi should be my max boost. When I drive the car now, for some reason when I give it WOT or any boost really, it goes way past 15 and goes past 30psi.

It seems that the turbo will start to boost, then fly to max boost on my autometer gauge. Checked the vacuum line from
the wastegate to TB and it is in perfect condition. So I donnowhat what's going on. Inning a 2 bar map sensor too. So WTF...??!!

Has anyone run into a similar problem before?

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48mpg · 10-30-2009, 08:32 PM

hook a line from the compressor housing to the bottom port of the wastegate.

and if you have a gauge and only want to run 15 psi, let off the gas before you get all the way to 30.

niemkij · 10-30-2009, 08:36 PM

Yes, be sure your hose goes from the turbo compressor outlet directly to the wastegate actuator as a test. You should not get more than 15 psi boost with a 15 psi spring.

jigga · 10-30-2009, 09:07 PM

unless of course someone sold you a wastegate with a 30lb spring?

mtcs · 10-30-2009, 09:41 PM

My turbo doesn't have a compressor housing outlet

Uncle Scotty · 10-30-2009, 09:50 PM

a new motor will be next

mtcs · 10-31-2009, 02:29 AM

I have a new motor. Built it myself.
Fixed the problem. Boosting normally now.

Turned out to be stupid. Had the vacuum line on the wrong output on the wastegate. Stupid mistake.

Thanks for all the help though guys.

10-30-2009, 08:22 PM	#1
mtcs Scooby Newbie Member#: 180640 Join Date: May 2008 Chapter/Region: Tri-State Location: Almond, NY Vehicle: 2000 Impreza RSTi Sedona Red	15lbs spring in wastegate, but gauge reads 30psi+ help Ok, so I got myself a little bit of a problem. I am currently running a gt3071r with an external 38mm tial wastegate. The spring in the wastegate is 15lbs. Not currently running a boost controller. So 15psi should be my max boost. When I drive the car now, for some reason when I give it WOT or any boost really, it goes way past 15 and goes past 30psi. It seems that the turbo will start to boost, then fly to max boost on my autometer gauge. Checked the vacuum line from the wastegate to TB and it is in perfect condition. So I donnowhat what's going on. Inning a 2 bar map sensor too. So WTF...??!! Has anyone run into a similar problem before? * Registered users of the site do not see these ads.

10-31-2009, 02:29 AM	#7
mtcs Scooby Newbie Member#: 180640 Join Date: May 2008 Chapter/Region: Tri-State Location: Almond, NY Vehicle: 2000 Impreza RSTi Sedona Red	I have a new motor. Built it myself. Fixed the problem. Boosting normally now. Turned out to be stupid. Had the vacuum line on the wrong output on the wastegate. Stupid mistake. Thanks for all the help though guys. Last edited by mtcs; 10-31-2009 at 03:05 AM.

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10-30-2009, 08:32 PM	#2
48mpg Scooby Specialist Member#: 58405 Join Date: Mar 2004 Location: So.Fla. Vehicle: 2004 Element GT65'd Hydra, Hydramist'd STi	hook a line from the compressor housing to the bottom port of the wastegate. and if you have a gauge and only want to run 15 psi, let off the gas before you get all the way to 30.

10-30-2009, 08:36 PM	#3
niemkij Scooby Newbie Member#: 141922 Join Date: Feb 2007 Chapter/Region: Tri-State Location: PA Vehicle: 2006 Impreza Sti Blue	Yes, be sure your hose goes from the turbo compressor outlet directly to the wastegate actuator as a test. You should not get more than 15 psi boost with a 15 psi spring.

10-30-2009, 09:07 PM	#4
jigga Scooby Guru Member#: 9960 Join Date: Sep 2001 Location: Ontario. Canada.	unless of course someone sold you a wastegate with a 30lb spring?

10-30-2009, 09:41 PM	#5
mtcs Scooby Newbie Member#: 180640 Join Date: May 2008 Chapter/Region: Tri-State Location: Almond, NY Vehicle: 2000 Impreza RSTi Sedona Red	My turbo doesn't have a compressor housing outlet

10-30-2009, 09:50 PM	#6
Uncle Scotty Scooby Guru Member#: 16200 Join Date: Mar 2002 Vehicle: bah straw and coal straw and coal as always	a new motor will be next