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Old 09-20-2019, 01:33 AM   #1
Dieseltechdave
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Member#: 506572
Join Date: Sep 2019
Chapter/Region: South East
Location: Va
Vehicle:
2009 Wrx
Steel Silver Metallic

Question Boost problem/Vehicle bucking w/ Log

Recently had my motor rebuilt completely and this is everything that was done/replaced:
Build List
-Machined Cylinder Heads, Cleaned, Milled, Pressure Tested, and
Installed New Seals/Guides/Valve
-Manley Forged Pistons
-Manley H-beam Connecting Rods
-King High Performance Rod and Main Bearings.
-Subaru 2012 STI Crankshaft
-Manley SS Intake Valves
-Manley SS Extreme Duty Exhaust Valves
-Oil Pump, 2010 STI
-Oil Pan, OEM
-Killer B Oil Pick-Up
-Killer B Windage Tray
-Supertech Valve Guides
-ARP head stud kit
-Gates Timing Belt Component kit w Water Pump
-Torque Solutions Block-Off Plates
-NGK Iridium Spark Plug, 1 step colder
-OEM Thermostat
-Oem Subaru Case Hardware
-Grimmspeed 3 port EBCS
-AP3-SUB-003 Cobb Accessport V3
-ACT Heavy Duty Performance Street Disc Clutch
-Resurfaced Flywheel
-Throttle Body Coupler
-Subaru AVCS Solenoid Passenger Side Intake
-Subaru Power Steering Rack 15+ STI
-Whiteline Front Inner Lower Control Arm Bushing
-Blouch Turbo 20gXTR
-Grimmspeed Tmic outlet hose
-GrimmSpeed Tmic
-Invidia N1 Cat Back Exhaust
-Injector Dynamics 1050 injectors
-DeatschWerks DW300c Series Fuel Pump
-Perrin ELH
-Grimmspeed Wastegate Bracket
-Turbosmart EWG
-Grimmspeed Uppipe
-Mishimoto Radiator
-PERRIN Turbo Inlet Hose Black
-Torque Solution Top Feed TGV Delete Kit
-STI Group N Left Side Engine Mount
-STI Group N Right Side Engine Mount
-Torque Solution Pitch Stop Mount Black
-Cometic Head Gasket
-Subaru Clutch Release Lever
-Gates Century Series Stretch-Fit Serpentine Belt

It's been running fine until last week. There are No CEL's . When I went wot the car took a nose dive and felt super boggy/hesitant @ 15 psi. Easing up in rpms I have no issues though, it's only at wot. I've checked all the piping/hoses for boost leaks without luck on finding what's causing the problem. I'm new to Subarus so I could use some help on this. I did datalog a session but I haven't figured out how to post it let alone read it correctly.

**Here is my Datalog that I ran last night**
https://docs.google.com/spreadsheets...0SwhFF/pubhtml

Thanks in advance
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Last edited by Dieseltechdave; 09-20-2019 at 08:46 AM. Reason: Build List/Log
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Old 09-21-2019, 12:57 AM   #2
Dieseltechdave
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Join Date: Sep 2019
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Location: Va
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2009 Wrx
Steel Silver Metallic

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Bump for the 90 views and 0 responses. If I've posted in the wrong section could an admin or someone move the thread?
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Old 09-21-2019, 02:58 PM   #3
TDagen
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Join Date: Nov 2007
Chapter/Region: MWSOC
Location: Xona 7864 UHF
Vehicle:
2002 WRX
V9 6mt R180 Brembos

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I’m guessing the plugs are newer since you listed one step colder, how do the coil packs look? Any bulging or swelling at all?

Do you have a wideband afr gauge?

It’s hard to get a good look at a log with all those parameters being logged at once. But from what I could tell most of the log was 4th gear cruising with 36% being the farthest the throttle opened, so in this log the car was running smooth right?
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Old 09-21-2019, 06:33 PM   #4
Dieseltechdave
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Steel Silver Metallic

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It does drive smooth until I try to go wide open throttle. The packs are fine and yes they are fresh plugs. I did find one of the ports on my Ecbs not hooked up or run to anything. The routing I've seen off the Grimmspeed site doesn't have any of the ports not connected. I do not have a wideband no.
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Old 09-21-2019, 10:05 PM   #5
TDagen
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2002 WRX
V9 6mt R180 Brembos

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When you jab the throttle the one time in that log your timing looks good for lower rpm/torque area @ 13 degrees. You hit 12psi, no knock picked up by the ecu, DA stayed at 1. I would recommend getting a wideband so you can see what your fueling is doing. It could be going super rich at WOT and stumbling really hard from what you describe.

If you look at your af sensor #1 in the log you can see the factory sensor doesn’t read below 11.14, you cannot tell what the fueling is at once that hard limit (11.14) is reached by the stock sensor. If you have a wideband gauge you basically have an engine “lifeblood” monitor right in the cockpit. Also if your attentive you can catch fueling problems before they turn into a melted piston etc.

Did the ebcs port change anything? Did the ebcs line blow off under boost?
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Old 09-22-2019, 02:40 AM   #6
Dieseltechdave
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2009 Wrx
Steel Silver Metallic

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Quote:
Originally Posted by TDagen View Post
When you jab the throttle the one time in that log your timing looks good for lower rpm/torque area @ 13 degrees. You hit 12psi, no knock picked up by the ecu, DA stayed at 1. I would recommend getting a wideband so you can see what your fueling is doing. It could be going super rich at WOT and stumbling really hard from what you describe.

If you look at your af sensor #1 in the log you can see the factory sensor doesn’t read below 11.14, you cannot tell what the fueling is at once that hard limit (11.14) is reached by the stock sensor. If you have a wideband gauge you basically have an engine “lifeblood” monitor right in the cockpit. Also if your attentive you can catch fueling problems before they turn into a melted piston etc.

Did the ebcs port change anything? Did the ebcs line blow off under boost?
I honestly don't know whether the line blew off or it wasn't installed to begin with. There are a few different routings I've seen on both Grimmspeed and the Turbosmart sites. I can't see anything or any open ports outside of the 1 on the Ebcs and the 1 on the upper port on External Wastegate. The hose has yet to be found & whether it fell off I will find out soon and update the thread.

Last edited by Dieseltechdave; 09-22-2019 at 03:22 AM.
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Old 10-12-2019, 07:20 PM   #7
motoxnate
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Black

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As a couple others mentioned it doesn't look like you passed half throttle in the log. My best guess is it's just flooding the engine with gas under load. My car is making good power with 1050s and a Blouch 20G, but the A/F never dips below 11.25. If you're bottoming out at 11.14, and probably dropping lower that could be an issue. Also if it's not a Wideband, maybe its reading inaccurately in the low end.

I run around 70% duty cycle with 1050's at WOT with the same turbo and you're reading 40% duty here at 35% throttle. I would say its likely flooded. Get a Wideband and a retune!
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Old 10-12-2019, 07:58 PM   #8
subaru_gc8
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i had that same problem, comes to find out thawt I was overboosting one of the boost maps.
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Old 10-13-2019, 12:35 AM   #9
18cbs
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2018 sti
cbs

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is it boost creep? sounds like it
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