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Old 03-02-2010, 05:39 AM   #1
alcoolaid
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Join Date: Dec 2006
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'07 SWP STi
Instagram | arthurlam89

Default Maxwell Power Tuned, 2.5L Twinscroll T4 S300sx 574WHP

Build thread: http://forums.nasioc.com/forums/show....php?t=1936152

Basically a home built block with 2.5L off the shelf parts and a Dom Tune.

Event: Dyno Tune
Location: Maxwell Power Services in Arlington, WA
Ambient Temp: 51F 68% Humidity
Elevation: 200ft
Weather: Seattle Weather

Car: 2007 STi
Tuner: Dominic Acia of Maxwell Power Services (DomTune)
Dyno Info: DynoCom
Peak HP at RPM: 574 WHP @ 6300 RPM SAE Corrected / 596 WHP Uncorrected
Peak Torque at RPM: 502 WTQ @ 5750 RPM SAE Corrected / 522 WTQ Uncorrected
Baseline hp/tq for a stock on same dyno: 245 WHP
Target Boost: 29psi
Target AFR: 11
Fuel: 94 octane + 70/30 meth
Method: Vi-Pec V88


Engine/Power Modifications:
EJ257
CP Pistons 99.75mm w/ Ceramic Crown and Molybdenum Disulfide Skirt Coating
Carrillo Forged H-Beam Rods
Engine Fully Balanced
Stock STI Crank – Lightened a little bit
Calico Coated ACL Race Bearings
OEM Head Gaskets
ARP Head studs
11mm Oil Pump w/2 shims

B25 Heads
Kelford 276/272 AVCS Cams
5-Angle Intake Valve Job
3-Angle & Radiused Exhaust Valve Job
Supertech +1mm IN/EX Valves
Valves Lapped
Supertech Dual Valve Springs
Titanium Retainers

Other stuff:
Gates Racing Timing Belt
TGV Port and Delete
Ported Intake Manifold
BW S300sx 83-75 0.91AR
Custom TS-T4 header/up-pipe
Dual Tial 38mm MV-S WG’s
Mocal 25 Row Oil Cooler
Mocal Sandwich Adapter w/ Thermostat
MAC 3 Port Boost Solenoid
AEM/Zeitronix 3.5Bar MAP Sensor
APS DR725 FMIC with Custom Upper Pipes
GrimmSpeed 8mm Phenolic Spacers
Walbro 255LPH Fuel Pump Intank
Bosch 044 External Fuel Pump
Canton Racing 8 micron Fuel Filter
Covert Performance Fuel Surge tank
-8AN Feed and -6AN Return Fuel Lines
Injector Dynamics Bosch 1000cc Injectors
Aeromotive Top Feed Fuel Rails
Aeromotive A1000-6 FPR
Aquamist HFS-5 Meth Injection System 2x 1.0mm nozzles
Spec C STI 12L Intercooler Spray Tank
Vi-Pec V88 Standalone ECU



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Last edited by alcoolaid; 03-02-2010 at 06:38 AM.
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Old 03-02-2010, 08:30 AM   #2
Cbgrandtheftauto
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that turbo sounds sweet...you have a very nice setup
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Old 03-02-2010, 09:11 AM   #3
TDagen
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Very nice Borg Warners do sound sick.... Looks solid!
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Old 03-02-2010, 09:17 AM   #4
jigga
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Congratulations on the new-found power. Sounds evil!

Now for some videos on it in action
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Old 03-02-2010, 09:33 AM   #5
TDagen
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FNF LSX Swap,E85 and more

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How was tuning the vi pec? The 83-75 really holds the power well!
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Old 03-02-2010, 10:10 AM   #6
kellygnsd
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LINK G4 hybrid STi

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Did you balance the rotating assembly yourself?
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Old 03-02-2010, 10:46 AM   #7
CatfaceType-R
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that headwork sure did a decent amount eh? area under the curve is siiick!
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Old 03-02-2010, 11:51 AM   #8
berdugo
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very nice power
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Old 03-02-2010, 04:28 PM   #9
moosecakes
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Maxwell Power

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Some very nasty stuff coming out of that shop lately.
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Old 03-02-2010, 04:41 PM   #10
Equilibrium Tuning
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CGM

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Lookin good Dom. Did you try to add a bit of fuel in the 4-5k RPM range to see if you could bring in a bit more boost there? Looks like if boost levels came up a bit in that range, you could shift the torque peak down bellow 5k RPM. That would be a very nice power band!

-- Ed
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Old 03-02-2010, 04:41 PM   #11
Equilibrium Tuning
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Lookin good Dom. Did you try to add a bit of fuel in the 4-5k RPM range to see if you could bring in a bit more boost there? Looks like if boost levels came up a bit in that range, you could shift the torque peak down bellow 5k RPM. That would be a very nice power band!

-- Ed
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Old 03-02-2010, 05:13 PM   #12
juanmedina
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WRX VF39+E85 12.0, 121mph

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Quote:
Originally Posted by soon2bblackongold View Post
that headwork sure did a decent amount eh? area under the curve is siiick!
I agree sickess year ever from what I have seen in the PPB section
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Old 03-02-2010, 05:19 PM   #13
alcoolaid
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Quote:
Originally Posted by jigga View Post
Congratulations on the new-found power. Sounds evil!

Now for some videos on it in action
I'm sure I'll have some for you in a bit

Quote:
Originally Posted by TDagen View Post
How was tuning the vi pec? The 83-75 really holds the power well!
Getting it set up initially took quite some time. Once it was all setup things went quite smoothly actually.

Quote:
Originally Posted by kellygnsd View Post
Did you balance the rotating assembly yourself?
Local machine shop balanced it for me then I assembled it all.

Quote:
Originally Posted by soon2bblackongold View Post
that headwork sure did a decent amount eh? area under the curve is siiick!
No kidding. I gained a crazy amount of power over the last setup with less boost. Holds it all the way to redline too.

Quote:
Originally Posted by moosecakes View Post
Some very nasty stuff coming out of that shop lately.
I have to agree!
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Old 03-07-2010, 12:07 AM   #14
Maxwell Power
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Quote:
Originally Posted by Equilibrium Tuning View Post
Lookin good Dom. Did you try to add a bit of fuel in the 4-5k RPM range to see if you could bring in a bit more boost there? Looks like if boost levels came up a bit in that range, you could shift the torque peak down bellow 5k RPM. That would be a very nice power band!

-- Ed
Arthur spends a lot of time on the track. I put a little extra fuel in around peak boost just to help ward off knock when the heat soak sets in and to help keep egt's under control. With as much power as that car was making, the few hp sacrificed was well worth the added safety margin.

That turbo setup is amazing, btw.
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Old 03-07-2010, 12:11 AM   #15
Maxwell Power
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Quote:
Originally Posted by TDagen View Post
How was tuning the vi pec? The 83-75 really holds the power well!
after spending more time with it, overall I like the ViPec. There are a handful of things that drive me crazy like not being able to change the units to PSI and the DBW calibration procedure. However, they claim that they are fixing most of it in the next revision.... hope so. This is a VERY powerful unit with a lot of customization and user definable options.

Right now the AEM and ViPec are my two favorite systems for the Subaru that are mostly "plug and play" for DBW.
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Old 03-07-2010, 12:35 AM   #16
TDagen
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FNF LSX Swap,E85 and more

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Quote:
Originally Posted by Maxwell Power View Post
after spending more time with it, overall I like the ViPec. There are a handful of things that drive me crazy like not being able to change the units to PSI and the DBW calibration procedure. However, they claim that they are fixing most of it in the next revision.... hope so. This is a VERY powerful unit with a lot of customization and user definable options.

Right now the AEM and ViPec are my two favorite systems for the Subaru that are mostly "plug and play" for DBW.
Cool , Yeah I have DBC so not worried about that, reading psi in bar would get annoying though lol! I am going to be tuning my Borg warner 91-79 twin scroll (40r) on the grp n rom and see what I can do.... If I run into problems (resolution ect) I will probably go AEM it sounds like... Did you like the way these borg warners scream when they boost dom?
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Old 03-07-2010, 01:50 AM   #17
alcoolaid
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Old 03-07-2010, 02:30 PM   #18
Bariga
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EFR 7670 TS

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can you post here dyno with stock heads and build heads? how much was gained?
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Old 03-07-2010, 02:37 PM   #19
im2ninja4u
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The turbo sounds so sick lol!
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Old 03-07-2010, 05:19 PM   #20
erikos
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I think I just figured out what I want...... Awesome looking graph...
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Old 03-07-2010, 06:04 PM   #21
juanmedina
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WRX VF39+E85 12.0, 121mph

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TS FTW

Dom should overlay your car VS this single scroll 2.6L just for fun

http://forums.nasioc.com/forums/show....php?t=1946247
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Old 03-07-2010, 06:07 PM   #22
leonbmx
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Domtuned Stage $$$$$

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Quote:
Originally Posted by juanmedina View Post
TS FTW

Dom should overlay your car VS this single scroll 2.6L just for fun

http://forums.nasioc.com/forums/show....php?t=1946247
I am waiting to receive the same TS kit he has, but I will be running a TS HTA-GT35106R. That map needs to be overlay-ed
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Old 03-07-2010, 06:11 PM   #23
juanmedina
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Quote:
Originally Posted by leonbmx View Post
I am waiting to receive the same TS kit he has, but I will be running a TS HTA-GT35106R. That map needs to be overlay-ed
who makes the TS header? by looking at your graph and this car's graph; TS makes a huge difference.

Can't wait!
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Old 03-07-2010, 06:11 PM   #24
leonbmx
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Covert Performance
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Old 03-07-2010, 06:18 PM   #25
alcoolaid
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Quote:
Originally Posted by juanmedina View Post
TS FTW

Dom should overlay your car VS this single scroll 2.6L just for fun

http://forums.nasioc.com/forums/show....php?t=1946247
That's some nice peak power. Only if it held out better
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