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Old 06-20-2018, 03:20 AM   #1
Scooby Specialist
Member#: 93812
Join Date: Aug 2005
Chapter/Region: SCIC
Location: Huntington Beach,CA
2004 Wrx wagon
Platinum Silver Metallic

Default Boost and Fuel Questions

Hi everyone,

Looking for feedback and overall consensus here:

1) What is a normal tolerance for Boost levels to drop in hot weather vs cold weather? Looking for sea level comparison. Cold weather / target boost = 17lbs. Warmer hot weather consistent 16.2lbs and sometimes 15.8lbs.

2) What are normal STFT numbers for stage 2 tunes? Ive been seeing STFT -20's all the way to + 15 or 18. My LTFT are -1 to +3% and within the acceptable +/- 4-5% ranges.

Car: 2004 USDM wax wagon MT
Fuel: CA 91 Octane (Socal)
Elevation: 39 ft (Sealevel)
Cold Weather: Currently 55-65 degrees
Hot Weather: Currently 70-85 degrees

TD04 Turbo (Stock)
Gutted STI Downpipe
Sti Catless Uppipe
Oem Header (Port and Polished)
Greddy 3 inch exhaust
Grimmspeed EBCS
Walbro 255 Fuel Pump
Stock Intake
Stock Injectors
Stock Intercooler
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Old 06-20-2018, 12:30 PM   #2
Scooby Specialist
Member#: 385256
Join Date: Mar 2014
Chapter/Region: Tri-State
Location: Harriman NY
V7 S204


Neither are straight forward questions and depend on weather, tuning, and operating state.
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Old 07-09-2018, 06:49 PM   #3
Scooby Newbie
Member#: 488141
Join Date: Jul 2018

You can set adjustments for weather so your boost stays the same, or at least very close.

And as far as STFT you might refer to the COBB Stage 2 Setup. I am guessing that is what you mean by "normal". Lots of people are on complete stock fuel setups still running Stg 2, so what is normal for them really wouldn't be normal for a FP upgrade and injectors.
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