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Old 09-23-2016, 08:05 PM   #1
Rizen
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Join Date: Aug 2007
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Location: Jacksonville, FL
Vehicle:
2011 Street Mod STI
450whp, 11.8 @ 124

Default 2011 STI, Dom 2.5 XT-R - 450whp/460wtq

Just picked up my car from tuning with Mikey @ Dirty Racing Products (DRP) in Green Cove Springs, FL.

Ambient Temp: Mid 80s
Elevation: Sea level
Weather: hot

Car: 2011 STI
Tuner: Mikey Botti
Dyno Info: Mustang 500
Transmission: Stock STI 6 speed
Gear: 4th
Peak HP: 450
Peak Torque: 460
Baseline hp/tq: stock 2015 STI made 220/220 on this dyno
Target Boost: 26-27 psi
Fuel: E85
AFR: See graph

Full list of mods at the bottom of this post.





Either ran out of waste gate spring or the turbo simply runs out of breath up top, so boost tapers from 27-28 psi down to ~21-22 or so. Regardless I am SUPER thrilled with how this feels. My goal for the car was a solid 450whp, as I run the car in Street Mod in autocross and occasional track/HPDE events. The power comes on strong and pulls hard.

DRP did the engine assembly and installation and I can't be more pleased with their work either. Would definitely recommend them especially if you live in North FL.

==ENGINE==
IAG Closed Deck EJ257 block
CP 9:1 Forged Pistons, coated
Manley Turbo Tuff Rods
OEM STI crank
ACL Race Bearings
Headgames Motorworks ported/polished dual AVCS heads
Ferrea Valves/Seals
GSC Stage 2 billet cams
GSC Titanium Springs/Retainers
ARP Age 625 head studs
ARP Rod Bolts
ACL oil pump
Fluidampr crank pulley/balancer
KillerB Motorsports Oil pan
KillerB Motorsports Oil Pickup
KillerB Motorsports Windage Tray
Process West Oil Cooler
Koyo Radiator
Air pump deletes
Assembled by Dirty Racing Products, Green Cove Springs FL

==POWER==
Blouch Dominator 2.5XT-R turbo, billet wheel, 10cm^2 hotside
TurboXS 4" downpipe
TurboXS cat delete race pipe
Lachute Performance catback, quad tips w/ resonator deleted
KillerB Motorsports Equal Length Header, Swaintech coated
GrimmSpeed 3-port EBCS
GrimmSpeed ported/coated TGV deletes
GrimmSpeed 3mm phenolic spacers
GrimmSpeed v-band EWG uppipe
TurboSmart 40mm CompGate EWG
Perrin turbo inlet
ETS 3.5" FMIC
ETS Speed Density Intake
TiAL BOV
Walbro 485 fuel pump, hardwired
ID 1700cc injectors
IAG Fuel Rails
IAG Competition Air/Oil Separator
Aeromotive FPR
Turbosmart Fuel Pressure Gauge
DEI titanium turbo blanket
Cobb AccessPort V3
Cobb FlexFuel E85 kit
Omni 4 bar MAP sensor
Speed density conversion
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Last edited by Rizen; 10-01-2016 at 07:07 PM.
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Old 09-24-2016, 01:30 AM   #2
02nismokiller
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Sick setup! Saw Mikey post the pic of your car on FB! How much boost you want to run?
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Old 09-24-2016, 01:54 AM   #3
Rizen
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2011 Street Mod STI
450whp, 11.8 @ 124

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The short block should be good for way more boost than this turbo will put out. I'm investigating other turbo setups if I eventually want to go a bit more aggressive, but it's hard to argue with the current powerband here, considering I use this car primarily for autoX.

On E85 it is currently running about 26.5 psi per my AP logs.
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Old 09-24-2016, 02:06 AM   #4
Joshwrx04
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Default 2011 STI, Dom 2.5 XT-R - 450whp/460wtq

Nice area under the curve.
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Old 09-24-2016, 11:38 AM   #5
Paul
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When do you see full boost on street in 3rd gear?
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Old 09-24-2016, 12:24 PM   #6
krisk
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Sweet! I bet it's a blast on the street!

How high do u plan on spinning the motor?
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Old 09-24-2016, 12:55 PM   #7
Rizen
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450whp, 11.8 @ 124

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Quote:
Originally Posted by Paul View Post
When do you see full boost on street in 3rd gear?
I'll check today. Full boost on the dyno was around 3800, so probably another 100 rpm or so earlier.
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Old 09-24-2016, 12:56 PM   #8
Rizen
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450whp, 11.8 @ 124

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Quote:
Originally Posted by krisk View Post
Sweet! I bet it's a blast on the street!

How high do u plan on spinning the motor?
Redline is set to 7800, but that's mostly so I don't have to shift to 3rd on autoX courses. Outside of that, probably low 7000s. I need to change the wastegate spring so the boost holds higher.
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Old 09-25-2016, 10:56 PM   #9
Harey
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Awesome spool, great area under the curve!!! On a built 2.5L looks like 2.5XTR is a better choice than the 1.5XTR.
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Old 09-26-2016, 12:25 PM   #10
Rizen
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Location: Jacksonville, FL
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2011 Street Mod STI
450whp, 11.8 @ 124

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Took the car to my first autoX on the new build this weekend - exactly one week after I first picked it up from the shop for break in and 2 days after tuning

It is a handful, but it's so much fun to drive. I never felt like I was out of the powerband, and power comes on very fast.
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Old 09-26-2016, 02:43 PM   #11
Scooby921
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Worthless bull**** has been removed. Keep it peaceful and on-topic or don't bother posting.
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Old 09-26-2016, 04:11 PM   #12
bmxhotsauce
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great Power. crazy to see the 2.5 XTR spool faster then the 1.5 XTR what made you choice that turbo and not the 1.5?

great power
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Old 09-26-2016, 04:35 PM   #13
Rizen
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450whp, 11.8 @ 124

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Quote:
Originally Posted by bmxhotsauce View Post
great Power. crazy to see the 2.5 XTR spool faster then the 1.5 XTR what made you choice that turbo and not the 1.5?

great power
The honest answer is that I got a very good deal on it. I picked it up for $800 locally and it just needed a rebuild from Blouch. I was surprised to see how fast it spooled as well. I don't think I've seen another 2.5 XT-R build here that made this much power this quickly.
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Old 09-26-2016, 04:46 PM   #14
bmxhotsauce
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Quote:
Originally Posted by Rizen View Post
The honest answer is that I got a very good deal on it. I picked it up for $800 locally and it just needed a rebuild from Blouch. I was surprised to see how fast it spooled as well. I don't think I've seen another 2.5 XT-R build here that made this much power this quickly.
no not at all... you got a unicorn lol congrats bro
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Old 09-26-2016, 09:49 PM   #15
user1029
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my post got deleted so I'll repost it

Nice spool
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Old 09-27-2016, 02:06 PM   #16
zack.subaruwrxsti
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How do you like the IAG AOS it looks huge... cant decide between that and the radium AOS. Quality looks great though
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Old 09-27-2016, 02:24 PM   #17
bmxhotsauce
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Quote:
Originally Posted by zack.subaruwrxsti View Post
How do you like the IAG AOS it looks huge... cant decide between that and the radium AOS. Quality looks great though
ya on E85 IAG states to go with the street AOS. or you have to change your oil every 1500 miles.

how do you like it? i been looking at that or a dual catch can set up. on E85
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Old 09-27-2016, 02:30 PM   #18
Rizen
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Member#: 157002
Join Date: Aug 2007
Chapter/Region: South East
Location: Jacksonville, FL
Vehicle:
2011 Street Mod STI
450whp, 11.8 @ 124

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I like the IAG AOS. I was running the Competition AOS back when I was on pump gas and I just haven't changed it over. I don't DD the car anymore so changing the oil every 1500 miles is probably 3-4 months for me, so not a big deal. I'm going to have an oil analysis done by Blackstone and see how much the ethanol is actually diluding the oil as well.

That issue aside, it's a great product and the fitment is actually really nice. It was easy to install. The only problem you may have is that strut bars probably won't work in the location on the back left of the engine bay.
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Old 09-30-2016, 02:45 AM   #19
Joshwrx04
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94 Legacy SS

Default 2011 STI, Dom 2.5 XT-R - 450whp/460wtq

I also run a comp iag aos on e85. And same as you I don't dd it so I won't hit 1500 miles but every 3-4 months.
Curious what a Blackstone analysis would revile
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Old 09-30-2016, 11:49 AM   #20
fourmicah
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This is one of the best power bands I've seen on a car like this. Looks like a pretty good set up for success.

How do you like the IAG Motor? I'm thinking of getting the same one when I begin my build next year.
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Old 09-30-2016, 11:55 AM   #21
Rizen
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2011 Street Mod STI
450whp, 11.8 @ 124

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Quote:
Originally Posted by fourmicah View Post
This is one of the best power bands I've seen on a car like this. Looks like a pretty good set up for success.

How do you like the IAG Motor? I'm thinking of getting the same one when I begin my build next year.
It's actually not an IAG motor. We used an IAG closed deck block, but the rest of the motor was put together by DRP using parts they selected. They did an excellent job imo.

The closed deck block on it's own is a work of art for sure though.

Here's a few pics of the build:





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Old 10-01-2016, 05:25 PM   #22
MetalRex69
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Awesome.
Question, what size spring did you have in it that wasn't enough?
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Old 10-01-2016, 07:04 PM   #23
Rizen
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2011 Street Mod STI
450whp, 11.8 @ 124

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After talking to some people more knowledgable than I, I don't think the spring is the problem. I have a 14psi wastegate spring which should be enough to hold 28psi with a boost controller. If I put the car in 4th gear at 3000rpm, and go WOT, the turbo will put out 28psi through 4000-5000 rpm, it just won't hold it up top. I think the turbo is just out of breath in the high rpm range. Not entirely surprising - Blouch rates this turbo at 490 crank horsepower and I'm making 450whp on it, so it's probably outside the efficiency range. With my heads and cams I think I would need a bigger turbo to flow more air.

But for what I use the car for this is perfectly fine.
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Old 10-03-2016, 06:42 PM   #24
tgtrefz
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I think the 9:1 compression really helps with the spool. I have a shortblock ready to go on my 11 wrx and should be in the 9.2-3:1 range on a dom 2.5xtr 8cm. This looks really promising.
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Old 10-10-2016, 04:29 PM   #25
Rizen
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450whp, 11.8 @ 124

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My friends at Spectro Racing put this together for me with the footage we shot while my car was being tuned at Dirty Racing Products. The fireball clip is the very first part of the video, then I talk about the car for a little while and there's another dyno pull. Thought I'd share, hope you enjoy

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