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Nameless Downpipe: Official 5th Gen GT Install Thread


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Superfluous post is superfluous. Edited by fahr_side
Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs.
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I'm in Colorado. No boost creep.

 

 

Sent from my iPhone using Tapatalk

 

 

What exhaust are you using behind the cat pipe?

 

 

Sent from a device using some software.

Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs.
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Disclaimer: I'm no expert

 

From what research I've done, it seems that the cause of creep is due to poor design flow to the wastegate port. The problem may be as simple as a small casting abnormality which directs flow away from the WG.

 

That being said, I suspect that altitude will decrease final boost pressure due to lack of atmospheric pressure but the change would not be significant enough to stop creep.

 

The design from Nameless is a good start by reducing the back pressure at the WG to avoid creep. I'm afraid the casting of your stock turbo may be to blame.

 

 

Sent from my iPhone using Tapatalk

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Disclaimer: I'm no expert

 

From what research I've done, it seems that the cause of creep is due to poor design flow to the wastegate port. The problem may be as simple as a small casting abnormality which directs flow away from the WG.

 

That being said, I suspect that altitude will decrease final boost pressure due to lack of atmospheric pressure but the change would not be significant enough to stop creep.

 

The design from Nameless is a good start by reducing the back pressure at the WG to avoid creep. I'm afraid the casting of your stock turbo may be to blame.

 

 

Sent from my iPhone using Tapatalk

I believe that is what fahr side has been saying all along.

 

Sent from my SAMSUNG-SGH-I337 using Tapatalk

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  • 2 weeks later...

http://legacygt.com/forums/picture.php?albumid=2423&pictureid=11080

http://legacygt.com/forums/picture.php?albumid=2423&pictureid=11079

 

So I got my car tuned today and these are the results. What are your thoughts? I haven't seen that dip on other people's graphs... what could be the cause?

My mods are:

Nameless DP

RacerX TMIC

GFB BPV

Grimmspeed EBCS

Unrelated suspension stuff

 

I used Xact Dyno in Tempe, he was recommended to me by Forced Air Tech.

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What did your tuner have to say about that dip?
Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs.
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He said that he tried adjusting the cam timing to compensate but was only able to move the dip to the left or right. He said that even increasing the WGDC in the dip didn't seem to change it, and that it might be some sort of mechanical issue.

I'm pretty confused about that... all the recent threads seemed to indicate that over boosting would be my issue.

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Very strange. Post a log if you have one.
Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs.
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