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Old 01-26-2013, 02:25 PM   #1
gsmith304
Scooby Newbie
 
Member#: 302159
Join Date: Nov 2011
Chapter/Region: MAIC
Location: West Virginia
Vehicle:
2003 WRX
Sonic Yellow

Default Overboosting on Stg1 LWG

I recently put on my silicone turbo inlet, while doing so my TMIC broke my T fitting for my WG and vac lines. So I put a different one in, slightly bigger than the stock one, I went WOT and went up to 18.6 psi. I re-flashed to Cobbs Stg1 LWG Map. And now I'm at 17psi. I seen where people purposely switch out the T fitting for a couple extra psi, and some have said the ECU will eventually relearn itself an adapt to the new T fitting? anyone have insight?

03 WRX
Cobb Intake
Silicone inlet
STi v7 TMIC
3' catback
Stg1 LWG AP Map
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Old 01-27-2013, 10:34 AM   #2
Cobb Tuning
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Join Date: Mar 2001
Location: Austin, DFW, Portland, SOCAL
Default

Quote:
Originally Posted by gsmith304 View Post
I recently put on my silicone turbo inlet, while doing so my TMIC broke my T fitting for my WG and vac lines. So I put a different one in, slightly bigger than the stock one, I went WOT and went up to 18.6 psi. I re-flashed to Cobbs Stg1 LWG Map. And now I'm at 17psi. I seen where people purposely switch out the T fitting for a couple extra psi, and some have said the ECU will eventually relearn itself an adapt to the new T fitting? anyone have insight?

03 WRX
Cobb Intake
Silicone inlet
STi v7 TMIC
3' catback
Stg1 LWG AP Map
Our off-the-shelf (OTS) maps are designed for the factory boost control hardware. Each map is set up with specific boost targets that are appropriate for the given mods and car. The entire tune, from fueling to ignition timing to boost are all set up to produce a safe level of performance. When you modify the parts of the boost control system to produce more boost than the map designates, you are risking potential engine damage (depending on how much you are overboosting and how long you run like that). Even with the stock boost control hardware, some cars may overboost or underboost. The way to properly solve that problem is via the available low wastegate (LWG - for overboosting) or high wastegate (HWG - for underboosting), not via modifying boost control hardware. TD04 cars (such as pre-09 WRX) have an additional adjustment via wastegate arm that you can use if the LWG or HWG does not achieve the level of boost that is acceptable.

I would suggest putting the stock t-fitting back in and then getting data logs (if you can do so safely) to see where you are at as far as boost (see video below).


Bill
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Old 01-28-2013, 12:11 PM   #3
gsmith304
Scooby Newbie
 
Member#: 302159
Join Date: Nov 2011
Chapter/Region: MAIC
Location: West Virginia
Vehicle:
2003 WRX
Sonic Yellow

Default

Okay thanks. The T fitting I put in was my only option at the time since my stock one broke, thanks for clarifying and the info. Much appreciated
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