|
|
|
|
Thread Tools | Display Modes |
06-25-2017, 08:20 PM | #1 |
Scooby Newbie
Member#: 444985
Join Date: Apr 2016
Vehicle:2016 STi Pearl White |
Tech Help
Hey Subie fam,
I finally got a chance to take my STi to the track yesterday. After about 3 to 4 laps, at WOT in 4th I started to get fuel cut off. I checked my AP and the stock boost gauge and noticed overboost with the stock boost gauge reading 24psi. Target boost pressures on the tune were 19.5psi in S#. Checked vacuum lines (visible ones) and no leaks. Tried baby-ing the car but no matter what after a few laps, same issue. 2016 STi Engine mods are as follows: Cobb AP Cobb SF Intake and Box Nameless Performance Turboback exhaust - thermal wrapped Grimmspeed EBCS NGK Iridium One Step Colder Spark Plugs Cobb Flex Fuel Kit 1100cc FIC Injectors AEM Fuel Pump IAG AOS Protuned on e85 I did data log the runs I just need to upload them to see what's going on. Can anybody help point me in the right direction about what could be failing? I was thinking maybe having to change my turbo inlet piping and intercooler piping so that I'm not running crazy A/F ratios, otherwise is next step putting a block plate on the turbo and running EWG? Any other ideas would be a ton of help!
* Registered users of the site do not see these ads.
|
06-26-2017, 12:54 PM | #2 |
Scooby Newbie
Member#: 348882
Join Date: Mar 2013
Chapter/Region:
MWSOC
Location: Royal Oak, MI
Vehicle:2012 WRX Hatch WRB |
catted or catless?
|
06-26-2017, 01:54 PM | #3 |
Scooby Newbie
Member#: 444985
Join Date: Apr 2016
Vehicle:2016 STi Pearl White |
Catted DP from Nameless Performance
|
06-26-2017, 02:55 PM | #4 |
Scooby Newbie
Member#: 65169
Join Date: Jun 2004
Chapter/Region:
RMIC
Location: Colorado Springs
Vehicle:2010 Outback 2016 STI CBS |
Shouldn't have boost creep/spike with those mods. I used to have a very similar setup and it was never an issue.
Double-check your vacuum lines on the wastegate itself. I had one pop off and would see boost in the 24-25psi range like you. |
06-26-2017, 03:01 PM | #5 |
Scooby Newbie
Member#: 348882
Join Date: Mar 2013
Chapter/Region:
MWSOC
Location: Royal Oak, MI
Vehicle:2012 WRX Hatch WRB |
Agree with nofriends on the creep. You should also verify that the restrictor pills going to the wastegate are still there. I would also verify that the gauge is reading correctly by comparing absolute manifold pressure. Datalogs will help diagnose the issue better if you have them.
|
06-29-2017, 09:03 PM | #6 |
Scooby Newbie
Member#: 444985
Join Date: Apr 2016
Vehicle:2016 STi Pearl White |
All lines look good. I was thinking its possible given summer heat that the stock hoses were collapsing under track conditions. It wasn't happening until 3 or 4 laps in usually and more towards the high heat part of the day.
|
Thread Tools | |
Display Modes | |
|
|