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Old 11-25-2014, 12:19 PM   #1
wgr73
Scooby Specialist
 
Member#: 232458
Join Date: Dec 2009
Chapter/Region: SWIC
Location: Las Cruces/El Paso
Vehicle:
2005 & 2008 STi
Cobb 20g & EFR 7670

Default 2004 STi 20g-xt 420whp Low boost E85

Nothing new here, just excited to get my brother back in a Subaru. He used to have an 02 wrx with a 6spd swap and an old school 20g, very very clean car. Sold it, now he's back

2004 STi

Tuner: Me
Dyno Type: VD
Temp: 83F (evening)
Elevation: 4500ft above sea level
Boost: 22psi taper to 20psi
Fuel: E75
Target AFR: 11:5 -> 12.1:1 @ Redline
Peak HP at RPM: 420whp @ 6076 RPMs
Peak Torque at RPM: 391wtq @ 4372 RPMs
Transmission: Stock 6 speed
Gear: 4th
Engine Management: Cobb AP V2 (Maf)


Engine/Power Modifications:
20G-XT 8cm
Perrin Inlet (?)
Turbo XS Fmic
TGV Deletes
Oil Catch Cans
GM EBCS
PE850s (Too small)
Aeromotive 340
73mm Short Ram intake
Catless downpipe
Invidia Catback
Stock Long block


Just installed this 20g-xt on my brothers car. This is NOT a daily driver map. The tune was pushing it a lot farther than I would normally push things...he wanted to say he hit 400whp so he had me turn it up. After he got his number I backed it down to 389whp (19-20psi) with richer fueling. Pulls great all the way out to redline. Spools very quick for our heat/elevation. There's a lot more in it, but due to fueling we can't *safely* go any further.

His plan is either to convert to topfeed (I'd suggest this) or get bigger sidefeeds. So far this turbo is really really nice. Very streetable as you can see from the VD below:

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Old 11-25-2014, 12:49 PM   #2
Dave D.
NASIOC Supporter
 
Member#: 130990
Join Date: Nov 2006
Chapter/Region: NWIC
Location: Menzel Lake, WA
Vehicle:
06 Red Ltd.Wagon
20g-xtr 427/427 JJtuned

Default

Very similar to my 20g-xtr pump tune at sea level. I don't think my numbers would look nearly this good at altitude and at 83 degrees, however! Nice, solid setup.
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Old 11-25-2014, 12:56 PM   #3
wgr73
Scooby Specialist
 
Member#: 232458
Join Date: Dec 2009
Chapter/Region: SWIC
Location: Las Cruces/El Paso
Vehicle:
2005 & 2008 STi
Cobb 20g & EFR 7670

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Thanks Dave! Gotta love sea level
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Old 03-18-2015, 10:08 AM   #4
emozer
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Member#: 355200
Join Date: May 2013
Chapter/Region: TXIC
Location: Brazil
Vehicle:
2004 Impreza WRX
Black Pearl

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Just for my reference, what the spark plug grade you're using? 7 or 8?
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Old 03-18-2015, 11:12 AM   #5
VladiWrX
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Member#: 145658
Join Date: Apr 2007
Location: NorCal
Vehicle:
On my 5th scoob
and lovin it

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These simple 20g/e85 setups are wonderful. Look at that torque curve
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Old 03-18-2015, 12:22 PM   #6
wgr73
Scooby Specialist
 
Member#: 232458
Join Date: Dec 2009
Chapter/Region: SWIC
Location: Las Cruces/El Paso
Vehicle:
2005 & 2008 STi
Cobb 20g & EFR 7670

Default

Quote:
Originally Posted by emozer View Post
Just for my reference, what the spark plug grade you're using? 7 or 8?
1 step colder Iridiums.

Quote:
Originally Posted by VladiWrX View Post
These simple 20g/e85 setups are wonderful. Look at that torque curve
His car makes me want to go back to this type of setup. No problems....safe, FUN power band.

Still can't wait to see what his car does turned up!
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Old 03-19-2015, 02:20 AM   #7
pooster.online
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Member#: 120461
Join Date: Jul 2006
Chapter/Region: BAIC
Location: Bay Area/ L.A
Vehicle:
2004 WRX STi JBP

Default

wow that curve is VERY impressive, it must be agressive up top as there is no dropoff in torque in the top end that you typically see on the EJ25.

Would you care to elaborate on the current set-up you have now?? Just curious about what kind of diminishing marginal returns we can expect with regards to power mods.
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Old 03-19-2015, 07:32 AM   #8
bluemax189
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Member#: 137405
Join Date: Jan 2007
Chapter/Region: MAIC
Location: Baltimore
Vehicle:
2011 WRX 6spd
GTX3076r

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Great number even at 4500'!!!!
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Old 03-19-2015, 11:31 AM   #9
wgr73
Scooby Specialist
 
Member#: 232458
Join Date: Dec 2009
Chapter/Region: SWIC
Location: Las Cruces/El Paso
Vehicle:
2005 & 2008 STi
Cobb 20g & EFR 7670

Default

Quote:
Originally Posted by pooster.online View Post
wow that curve is VERY impressive, it must be agressive up top as there is no dropoff in torque in the top end that you typically see on the EJ25.

Would you care to elaborate on the current set-up you have now?? Just curious about what kind of diminishing marginal returns we can expect with regards to power mods.
16-23*

He has the same setup, still. I told him he needs injectors and pistons at the least. I just don't feel good about turning it up anymore on the stock shorblock.

I'll have a spare built motor in a couple months. I may swap that in as well as some bigger topfeeds (ID1300s probably) and go for 460-475.

Quote:
Originally Posted by bluemax189 View Post
Great number even at 4500'!!!!
Thanks man! I was very surprised as well. We did 3 pulls on this revision to get more data....every pull was within 2-3whp.
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Old 06-17-2016, 08:21 AM   #10
wgr73
Scooby Specialist
 
Member#: 232458
Join Date: Dec 2009
Chapter/Region: SWIC
Location: Las Cruces/El Paso
Vehicle:
2005 & 2008 STi
Cobb 20g & EFR 7670

Default

Update!

Almost 2 years later, stock motor real dyno!

Loading in dyno was turned off (late spool)

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