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Old 04-20-2016, 01:27 PM   #1
MrPink666
Scooby Newbie
 
Member#: 429304
Join Date: Sep 2015
Chapter/Region: RMIC
Location: Salt Lake City
Vehicle:
2008 STI
DGM

Default Freshly built car, i need advice/help!!

This is a bit of a story, so i'll try to keep this as short as possible. I recently blew up my sti and decided to build the block/upgrade. I got the car back with a break in tune and broke it in as recommended by my builder. I took the car to be tuned and everything went fine. Later that day it started stuttering around 5000-5500 rmps and sometimes around 3k. Feels like it hits a wall at that rev range. Called my tuner and met with him again. AFR had gone from around 10.5 to 9.5 somehow. So we retuned. Once again, tuning went well and the car ran perfectly while tuning (Road Tune). As soon as we finished I was driving home, dropped a gear, AND THE SAME THING HAPPENED. Needless to say I called my tuner again and met with him a third time. AFR had again dropped to 9.5. So we tuned again and everything went great. He even unplugged and had me drive around for a while to make sure everything was okay, and everything was fine until that night when it happened again. I checked the FPR, Perfect pressure. Can anyone tell me what could be going on? Parts list includes:
BUILT BLOCK (Manley pistons & Rods, Oversized valves, bearings)
FP GREEN HTZ IWG
AMR TOP MOUNT
COBB EBCS
TOMEI TYPE L FPR
TURBOSMART RECIRC BPV
COBB SF INTAKE
INVIDIA CATTED DOWNPIPE

There are more parts, but none that I would think could cause this issue. Any help is greatly appreciated. Thanks In advance!
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Old 04-20-2016, 01:44 PM   #2
Chris Cuevas
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Member#: 75547
Join Date: Nov 2004
Chapter/Region: SCIC
Location: San Diego, CA
Vehicle:
2016 STi-ICE Silver
SRP P&P'd VF22 + NOS= RIP

Default

Based how I perceive your question, sounds like you have a leak!
Check your intercooler connections and make sure the couplers are tight.

How much boost are running?
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Old 04-20-2016, 01:51 PM   #3
MrPink666
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Member#: 429304
Join Date: Sep 2015
Chapter/Region: RMIC
Location: Salt Lake City
Vehicle:
2008 STI
DGM

Default

Quote:
Originally Posted by Chris Cuevas View Post
Based how I perceive your question, sounds like you have a leak!
Check your intercooler connections and make sure the couplers are tight.

How much boost are running?
I was thinking that could be the problem. But wouldn't a leak typically show itself while tuning? Thats where i'm confused, while tuning everything is great. I will do a boost leak test and see what comes up. I'm tuned for 20 psi on 91. Thank you for the reply
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Old 04-20-2016, 02:26 PM   #4
Chris Cuevas
Scooby Specialist
 
Member#: 75547
Join Date: Nov 2004
Chapter/Region: SCIC
Location: San Diego, CA
Vehicle:
2016 STi-ICE Silver
SRP P&P'd VF22 + NOS= RIP

Default

Quote:
Originally Posted by MrPink666 View Post
As soon as we finished I was driving home, dropped a gear, AND THE SAME THING HAPPENED.
This is what makes me think you have a leak. I would also check you recirc valve and replace the gasket there to eliminate that possibility.

Most tuners tend to gradually get the throttle up through the RPM while its on the dyno. So, it could be possible that the leak didn't present during that time.

Also check your couplers and vacuum lines for tears and breaks.
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Old 04-20-2016, 10:25 PM   #5
MrPink666
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Member#: 429304
Join Date: Sep 2015
Chapter/Region: RMIC
Location: Salt Lake City
Vehicle:
2008 STI
DGM

Default

Thanks for the help, I will Definately take the advice and check it out
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