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Old 04-19-2009, 07:24 PM   #1
jbayless10
Scooby Newbie
 
Member#: 141536
Join Date: Feb 2007
Location: Kansas City
Vehicle:
2006 20G'd WRX
Grey

Default 2006 Wrx Tr-20g

Here are the major mods:

Engine:

Semi-closed EJ257 block
STI Rods
STI Crank
CP Pistons
Supertech Valve Spring Kit
.5mm over intake and exhaust valves

FP TD06 20g 7cm2
IAG 38mm External Wastegate
Perrin Front Mount Intercooler
Perrin Catless Downpipe
Perrin Cat-Back
P&P Exhaust Manifold
Grimmspeed Crosspipe
DW 750cc injectors
Walbro 255 fuel pump

Drivetrain:

STI RA gears
Exedy 3-puck Cerametalic Clutch
AEM Light Weight Flywheel


All three of these pulls were done on 18lbs of boost. For some reason power dips at 65mph then picks back up at 70. Could not tune it out either. Then at 80mph boost drops 4psi and power drops off until redline. There are no boost leak, no exhaust leaks, and no reason the boost should drop according to the tune. This is why we left boost at 18lbs and did not push it any more. If anyone else has seen power loss like this please let me know what it could be.

The car Drives great and pulls very hard in the mid range. After fixing whatever the issue is I plan on trying to get 370 whp or so out of it. Now onto the Graph!

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Old 04-20-2009, 02:18 PM   #2
renosubby
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Member#: 152576
Join Date: Jun 2007
Chapter/Region: SWIC
Location: Reno, NV
Vehicle:
2006 STI 10.8@ 129
www.Mayhemtuning.com

Default

any way to get it RPM instead of Speed!
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Old 04-20-2009, 02:23 PM   #3
jbayless10
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Member#: 141536
Join Date: Feb 2007
Location: Kansas City
Vehicle:
2006 20G'd WRX
Grey

Default

haha. no I do not have a way to change it.
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Old 04-21-2009, 11:51 AM   #4
06njsti
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Member#: 150986
Join Date: Jun 2007
Chapter/Region: Tri-State
Location: South Jersey
Vehicle:
06 #001 LSB STi

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20g's are all you need for the streel on the 2.5l block. i cant wait to finally get mine on this summer
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Old 04-21-2009, 02:12 PM   #5
Ntercooled
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Member#: 120100
Join Date: Jul 2006
Chapter/Region: South East
Location: Sarasota, FL
Vehicle:
2004 WRX stage 2
Soon to be vf43'd

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Any pics?
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Old 04-21-2009, 06:21 PM   #6
jbayless10
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Member#: 141536
Join Date: Feb 2007
Location: Kansas City
Vehicle:
2006 20G'd WRX
Grey

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sure!





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Old 04-22-2009, 12:06 AM   #7
jconaty07
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Member#: 139124
Join Date: Jan 2007
Chapter/Region: Tri-State
Location: Pt Pleasant, NJ
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badass lookin car
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Old 04-22-2009, 12:43 AM   #8
jbayless10
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Member#: 141536
Join Date: Feb 2007
Location: Kansas City
Vehicle:
2006 20G'd WRX
Grey

Default

thank you. I have decided to completely weld the internal wastegate flapper valve shut. I am thinking that even though the bracket that keeps it closed and it does not move at high rpm, exhaust gas could still be leaking from the flapper at high rpm. I am going insane over loosing 4 lbs boost at 6,500 rpm!

Thoughts?
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Old 04-22-2009, 01:32 PM   #9
boostdog
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Member#: 149752
Join Date: May 2007
Location: NW Arkansas
Vehicle:
07 wrx tr
rr tuned stg2 12.8@105mph

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who tuned it?
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Old 04-22-2009, 04:21 PM   #10
jbayless10
Scooby Newbie
 
Member#: 141536
Join Date: Feb 2007
Location: Kansas City
Vehicle:
2006 20G'd WRX
Grey

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Chad at Modified by KC did the tune. He has alerady checked the files and there is nothing that explains why boost drops at high rpm. It has to be something mechanical.
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Old 04-22-2009, 10:39 PM   #11
rico_q808
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Member#: 155896
Join Date: Aug 2007
Chapter/Region: HIIC
Location: OaHu,HaWaIi
Vehicle:
2006 WrX
bLuE

Default

Quote:
Originally Posted by jbayless10 View Post
thank you. I have decided to completely weld the internal wastegate flapper valve shut. I am thinking that even though the bracket that keeps it closed and it does not move at high rpm, exhaust gas could still be leaking from the flapper at high rpm. I am going insane over loosing 4 lbs boost at 6,500 rpm!

Thoughts?
Why not going with a larger wastegat or even a electronic boost controller to try and make it hold better?
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Old 04-22-2009, 10:54 PM   #12
goldshuscooby
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Member#: 177641
Join Date: Apr 2008
Chapter/Region: MAIC
Location: Stafford, VA
Vehicle:
2011 STi
SWP and Stage 1

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^^ yea maybe getting the Perrin ebcs would help...?! I'll let yah know how my tune goes in a couple weeks (18g on 2.0)
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Old 04-22-2009, 10:55 PM   #13
pacer07
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Member#: 207068
Join Date: Mar 2009
Chapter/Region: MWSOC
Location: Alton, IL
Vehicle:
06 Doesn't matter
its not a Subie!

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I like car! I like wheels! Rota DPT? Gunmetal?
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Old 04-23-2009, 03:08 AM   #14
Airboy
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Member#: 72829
Join Date: Oct 2004
Chapter/Region: W. Canada
Location: Calgary, Canada
Vehicle:
2006 WRX
MHI-TF06-18K

Default

Quote:
Originally Posted by jbayless10 View Post
thank you. I have decided to completely weld the internal wastegate flapper valve shut. I am thinking that even though the bracket that keeps it closed and it does not move at high rpm, exhaust gas could still be leaking from the flapper at high rpm. I am going insane over loosing 4 lbs boost at 6,500 rpm!

Thoughts?
The stock DBW throttle map closes the throttle to ~50% at 6500rpm. That is likely why you are losing boost. Have your tuner check that map.

[edit] Closer to 40%. Wastegate Duty Cycle is tied to throttle opening as well so it would have shown up in data logs.


Last edited by Airboy; 04-23-2009 at 11:01 AM.
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Old 04-23-2009, 03:40 AM   #15
KP
Scooby Guru
 
Member#: 147637
Join Date: Apr 2007
Chapter/Region: International
Location: PM SkimSTI for FREEEEEEEEEEEEE
Vehicle:
HJ's Ask
Hobbs. He knows.

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Quote:
Originally Posted by Airboy View Post
The stock DBW throttle map closes the throttle to ~50% at 6500rpm. That is likely why you are losing boost. Have your tuner check that map.
this. damn DBW.
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