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Old 07-09-2003, 08:40 PM   #1
WorldOne
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Member#: 22731
Join Date: Aug 2002
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
2002 WRB Do-Luck GDA
worldoneperformance.com

Default STi Max Boost: How high are you getting?

Hi there folks...

I am creating this thread to document boost annomilies that many of us our experiencing. In order to post in this thread, I would appreciate if you could include the following information.

1. Gauge that you are reading boost with (electric v mech)
2. Peak Boost Reading and Units (Bar v psi v kg/cm^2)
3. Gear in which peak boost achieved
4. Hold till redline or tapers off
5. Detonation? (yes or no)
6. If you have a PWH gauge include photo of peak boost on gauge)

I will start:

1. Greddy 60mm PWH Electronic.
2. 1.2kg/cm^2 = 17.1 PSI according to tool below.
3. 2nd and 3rd
4. Holds till Redline
5. Yes!
6. Will add pic shortly!

Coversion tool: http://www.ex.ac.uk/cimt/dictunit/ccpress.htm

Hopefully this thread will shed some light on the magnitude of the discrepencies that some of us our experiencing and educate us about our cars in the process!

Thanks for your participation!
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Last edited by WorldOne; 07-09-2003 at 08:52 PM.
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Old 07-10-2003, 03:38 AM   #2
StealthWagon
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Join Date: Dec 2002
Location: Boulder, Co/Bellingham, WA
Vehicle:
2004 WRX STI
Blue/Gold

Default

1. SECS PSI^3 data display. Reads boost and peak boost(and other stuff) from ECU

2. 15.1psi
3. 2nd and 3rd and 4th i think
4. tapers
5. no, 91octane
6. will take photo soon
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Old 07-10-2003, 08:03 AM   #3
strangerq
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Just a bit of history/warning.......

you will encounter the issue of aftermarket boost guages with custom installs, and to what degree readings can be trusted.

17 psi is really high. your car must be an absolute rocket.
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Old 07-10-2003, 08:17 AM   #4
ha-evolution
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Join Date: Jan 2003
Chapter/Region: MWSOC
Location: EC, WI
Vehicle:
15 STI WRB ordered
09 Accord Coupe V6 mt

Default

I'm hitting exactly 1 bar (14.5 psi) on my Defi BF. When it's warmer out it seems like boost is slightly reduced
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Old 07-10-2003, 08:24 AM   #5
happasaiyan
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1. defi bf
2. 1.1bar
3. 3, 4, 5, and 6
4. tapers off to 1.0bar
5. no
6. ill post later today.
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Old 07-10-2003, 01:12 PM   #6
WorldOne
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Join Date: Aug 2002
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
2002 WRB Do-Luck GDA
worldoneperformance.com

Default

I completely understand about the variances associated with custom mounted boost gauges and all other methods of measuring boost. For this reason I tested the reading with a separate boost gauge and recieved the same results.

1.2 kg/cm^2 is the absolute maximum boost that the car will achieve and this does not happen all the time. 1.1 kg/cm^2 is a regular occurance and easily achievable in every gear.

The cars natural tendency in anything less than 100% throttle is to taper the boost as you guys have mentioned. However if the gas pedel is pegged to the floor no such taper occurs.

My results are similar to those noted by the Turbo XS car and we are not sure of the cause at this time.


Thanks for reading.
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Old 07-10-2003, 06:44 PM   #7
happasaiyan
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i know for a fact mine tapers. when im running on down the highway at WOT, i hear the boost buzzer go off (i have mine at 15.5psi), then it will turn off at around 6k rpms. and yeah, my foot is all the way down.
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