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Old 01-03-2007, 05:16 PM   #1
AlboWRX
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Default 18g boost creep at 8 psi

Finally got the FP18G in and went to my tuner yesterday to tune it. He
started with 8 psi and it started boost creeping up to 20 psi and that`s only because he let go of the gas or else would have reached higher levels. This was in third and fourth gear. Have talked to Forced Performance also, and they told me that the turbo isn`t meant to be ran at that low pressure, that`s why its boost creeping. They also recommended to start tuning it at 15 psi. Now, this doesn`t make sense to me. What about part throttle driving when you`re only pushing 8 psi? This is in a 3" catless exhaust. The tuner also said that my car is the first 18G equipped car to boost creep. Recommendations were port and polish the turbine housing, EWG which is more money than I intended to put in this car to push 300 WHP. Now the tuner refuses to work on the car of obvious reasons. I also want both parties to go at it and figure out why this is happening.
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Old 01-03-2007, 05:24 PM   #2
PaulRex
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What kind of downpipe are you using?

Am I undestanding that your tuner was trying to tune your car at WOT to peak at 8psi? Why? To establish a fuel map?
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Old 01-03-2007, 05:29 PM   #3
AlboWRX
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Yes. He was in the beginning stages of tuning after he set the idle. I`m using a PDE downpipe which is bellmouth, although not as big as the TXS DP. This are my mods just to give you guys an idea of what I`m running:

FP18G
FP flexible oil line
Deatschwerks 750cc injectors
TurboXS TMIC
Wabro 255 FP
Turbosmart BPV
NGK BKR7E coppers
GM Boost Controller
Perrin Turbo Inlet
MAF Hose
PDE Downpipe
Borla Hush
STI Uppipe
AP Accesport
Cobb SF Intake
STi Scoop
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Old 01-03-2007, 06:20 PM   #4
Master2192
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Are you sure the BCS is working properly or setup properly?
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Old 01-03-2007, 06:35 PM   #5
AlboWRX
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http://forums.nasioc.com/forums/showthread.php?t=870619 I followed this DIY when I installed my BCS. I`ll double check the wiring but as I read in that DIY that voltage is not polarity sensitive.
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Old 01-03-2007, 07:10 PM   #6
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Just found out that it could fry the ECU if the wires are backwards on the BCS.
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Old 01-03-2007, 07:19 PM   #7
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just p&p the housing, I had boost creep on my vf34 setup, and that fixed it right up
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Old 01-03-2007, 07:34 PM   #8
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Thats another $150 out of my pocket that I dont have to. But if it comes to that than I`ll have to port it.
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Old 01-03-2007, 09:21 PM   #9
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Quote:
Originally Posted by SPOOLME View Post
just p&p the housing, I had boost creep on my vf34 setup, and that fixed it right up
How much boost creep were you seeing?
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Old 01-03-2007, 10:37 PM   #10
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hm boost creep shouldn't be dependant on the the turbo size.. from my understanding, if you have a turbobak exhaust, intake and what not it's going to make things ALOT free flowing and make the turbo spool sooner and cause it to boost creep. With the stock intake and exhaust it sorta controls the creep right? I'm coming from the rx7 world where this was the case and i figured it applied to most other cars. Shouldn't a nice big wastegate port clear up all the issues? If you don't have the money throw your stock exhaust back on and intake ( i'm not sure if you have a intake or not)
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Old 01-03-2007, 10:46 PM   #11
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Quote:
Originally Posted by AlboWRX View Post
Now the tuner refuses to work on the car of obvious reasons. I also want both parties to go at it and figure out why this is happening.
Why won't he help you fix it?

Have you determined if it's mechanical or electronic? What does running on the wastegate only do?
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Old 01-03-2007, 11:21 PM   #12
JMK508
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external wastegate and it is over. No questions asked. JMO
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Old 01-03-2007, 11:47 PM   #13
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Quote:
Originally Posted by tjeter View Post
hm boost creep shouldn't be dependant on the the turbo size.. from my understanding, if you have a turbobak exhaust, intake and what not it's going to make things ALOT free flowing and make the turbo spool sooner and cause it to boost creep. With the stock intake and exhaust it sorta controls the creep right? I'm coming from the rx7 world where this was the case and i figured it applied to most other cars. Shouldn't a nice big wastegate port clear up all the issues? If you don't have the money throw your stock exhaust back on and intake ( i'm not sure if you have a intake or not)
If it comes to that, might as well keep the stock turbo than, right??!! No dude, it`s not that I dont have money but it kinda sucks when you buy a brand new turbo and your tuner tells you that its the first 2.0 with an 18G to boost creep. And trust me, he`s a very good tuner which you all know but won`t mention his name to leave him out of this.
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Old 01-03-2007, 11:50 PM   #14
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Quote:
Originally Posted by lancelucas View Post
Why won't he help you fix it?

Have you determined if it's mechanical or electronic? What does running on the wastegate only do?
The tuner diagnosed it as boost creep as it was set at 8psi and shooting all the way to 20psi letting go at about 5500 or 6000 with more room to go but let go.
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Old 01-04-2007, 12:16 AM   #15
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go ewg . it's more money, but it's worth it.
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Old 01-04-2007, 12:20 AM   #16
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Like to be stealthy and from what I`ve heard ain`t nothing stealthy about EWG.
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Old 01-04-2007, 12:22 AM   #17
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That depends on which spring you get
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Old 01-04-2007, 01:08 AM   #18
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Quote:
Originally Posted by AlboWRX View Post
Like to be stealthy and from what I`ve heard ain`t nothing stealthy about EWG.
Circ it back into the DP.
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Old 01-04-2007, 01:19 AM   #19
AlboWRX
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Quote:
Originally Posted by lancelucas View Post
Circ it back into the DP.
That would be close to $1k for that. Uhm no.
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Old 01-04-2007, 03:23 AM   #20
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Try some other BCS and see if it helps...it has to be something in the bcs system as its not "mechanical" boost creep...not on a 18g 2.0.

FWIW, Im using the Prodrive solenoid on my car...But we never tried tuning it with the stocker. (I have a very, very similar setup to you...)
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Old 01-04-2007, 04:17 AM   #21
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Why not just run a hose from the turbo to the wastegate? What will it be then? 8 or 12psi maybe i dont know on that turbo but it takes a variable out too.
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Old 01-04-2007, 05:28 AM   #22
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^^^ I asume that if you just run waste gate pressure you should be able to possibly narrow down what it could be.

Good luck keep us updated.

,ian
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Old 01-04-2007, 08:56 AM   #23
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So, if I run a vacuum hose from turbo to actuator it should give me only wastegate pressure which is 8 psi? So I`m basically rerouting around BCS.
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Old 01-04-2007, 10:28 AM   #24
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<-------go external. really, you wont be dissapointed. Tial 44 here.

and if your worried about spending a extra 150....oh man are you in the wrong hobby.
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Old 01-04-2007, 10:41 AM   #25
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Quote:
Originally Posted by brex16 View Post

and if your worried about spending a extra 150....oh man are you in the wrong hobby.
Amen

I have been through this type of thing before.
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