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Old 11-09-2010, 01:32 AM   #1
jesterjames
Scooby Newbie
 
Member#: 252663
Join Date: Jul 2010
Chapter/Region: HIIC
Location: Bellingham, WA
Vehicle:
2002 WRX
Silver

Default Over boosting, wastegate duty cycle 0%

Brief history here, bought the car in july. The car came tuned to 17psi on a FP18G. Motor had ~20,000 miles on it according to the previous owner. Anyway i ended up having to rebuild it because of 2 bad rod bearings due to excessive knocking.
Motor is broke in and ready to go. I plan to get a pro tune before i start trying to make any real power. But heres the problem im having right now with my DD map.

2002 WRX
EJ205
Mods:
750cc injectors
Warlbro fuel pump
FP18G
Catless Invidia exhaust and uppipe
K&N intake
HUGE TMIC (looks to be a knock off)
STi EJ257 Cams (only thing ive added)


So my target boost is 11.6 psi
Im seeing 18-19psi above 6k
and 15-17psi 5-6k

Wastegate duty cycle is at 0 percent during all of this and boost is still rising. .062 pill

Since the old tune was originally for 17-18psi i do have enough fuel in the motor. (11.0-11.3) on my AEM wideband.
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Old 11-11-2010, 03:13 PM   #2
Cobb Tuning
NASIOC Vendor
 
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX
Default

How much boost are you seeing? Even at 0% WGDC you will still hit wastegate boost, naturally. However, if you are seeing over WG, it means that you are indeed boost creeping and you will have boost control issues. The stock 2009+ STI/WRX has problems with creep. Even at 0% WGDC they still build boost.

Travis
COBB Tuning
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Old 11-11-2010, 09:30 PM   #3
scoobystas
Scooby Specialist
 
Member#: 26568
Join Date: Oct 2002
Chapter/Region: NESIC
Location: Brighton, Mass
Vehicle:
2003 Yellow Bugeye
Version 8-Vf37

Default

Thats a ratio...not necessarily a measure of the amount fuel. But yes...11.0-11.3 is a safe enough ratio to run, but really depends on timing and boost too. Your other issue does indeed sound like creep. you'll probably want to look into getting your wastegate ported so that it can flow the air around the turbine and not into it, the latter causing you to create boost pressure.
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Old 11-12-2010, 02:45 AM   #4
jesterjames
Scooby Newbie
 
Member#: 252663
Join Date: Jul 2010
Chapter/Region: HIIC
Location: Bellingham, WA
Vehicle:
2002 WRX
Silver

Default

it must indeed be boost creep then.
Im seeing 18-18.5 psi above 6k and 14-16psi above 5k
Timing is really conservative, 14-16 degrees at 2.75 calculated load (im seeing 2.68 at 18.5 psi)
Its not a huge deal if i cant tune it out, the car is very drivable now, if i keep it below 5k anyway. And having the 18.5 psi up high is proving it self to be kinda nice when i want to get up to speed fast.
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Old 03-29-2020, 08:30 PM   #5
Wagonlver
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Member#: 479823
Join Date: Dec 2017
Default

[quote=Cobb Tuning;32433031]How much boost are you seeing? Even at 0% WGDC you will still hit wastegate boost, naturally. However, if you are seeing over WG, it means that you are indeed boost creeping and you will have boost control issues. The stock 2009+ STI/WRX has problems with creep. Even at 0% WGDC they still build boost.
Quote:

What if it boosts 6 psi max and the WGDC is constantly at 0%? What could be some potential problems, Someone stuff we should look into?

Travis
COBB Tuning
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