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Old 12-08-2016, 11:14 AM   #1
TopSpeed
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Default TopSpeed Motorsports | 2008 STi Dom 2.5XTR 477whp/488wtq

Car: 2008 STi
Location: TopSpeed Motorsports, Alpharetta GA
Tuner: Taylor at TopSpeed Motorsports
Dyno: Dynojet linked AWD
Transmission: Stock 2008 6-speed
Gear: 3rd
Peak hp at rpm: 477whp @ 5,800 rpm
Peak tq at rpm: 488wtq @ 4,280 rpm
Baseline for stock STi: 2015 STi made 246whp/253wtq. Don't have stock 2008 numbers.
Target boost: 24.5 psi tapering to 21.5
Fuel: E85

I thought I'd post this one up as it is a car that belongs to one of our employees, and he just wrapped it up recently and is very excited about it!

A little backstory on this car. He purchased it some time ago knowing it was going to need some work to get it where he wanted it. The motor was built by a small shop that wasn't too familiar with Subaru's and there were a lot of unknowns with the car as well. He did most of the aftermarket stuff after purchasing the car (turbo, TMIC, header, EWG, injectors, etc.) and the car consumed a little too much oil to be comfortable with so we decided to pull the engine out and build one of our SS1 engines and see what else we found while we were at it.

During the build, I convinced him to go with 9:1 compression pistons, and he also replaced his old leaky stock housing TGV deletes with some nice IAG TGV deletes. We then got the car running and he put some break-in miles on before hitting the dyno.

The complete mod list is as follows:

TSM SS1 shortblock
Stock heads/stock cams
Blouch Dom 2.5XTR stock location turbo
ETS TMIC
Tomei unequal length header
Tial 38mm external wastegate (sprung to 21psi)
3" downpipe and catback
Cobb intake with turbo inlet
IAG TGV deletes
ID1000cc injectors
Walbro 485 pump with 12V mod
Fuelab boost referenced FPR with 55psi base pressure
3-port EBCS

Tuned via Cobb AP V3

Boost was 24.5 psi peak with a taper down to 21.5 psi. It made less power with more boost up top so I tapered it down to where it made the flattest powerband. He has an EL header on the way and will probably be going FMIC soon, so it will likely be able to make use of the boost at that point, but we will make sure to test it and post the results!

E85 - 477whp/488wtq



The car made right around 400whp/400wtq on 93 and 21 psi WG pressure during break-in, but we saw no reason to push any further as he will never really run the car on the 93 map.



Thanks for looking!

-Taylor
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Old 12-08-2016, 01:26 PM   #2
NeverGoingback
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Very Nice build! Just a question for you but what was the injector duty like on E85? I only ask because I am running an almost identical setup, minus the Dom 2.5. Im running a blouch td06 20g xtr, and Cobb 1000cc injectors. My tuner only felt comfortable running them up to a little less than 90%. The car put down 390 on 91 @ 23psi, and 411 on E85 @ 17 psi. I was told that I would need 1000+ injectors to run more fuel on e85, but here you are running a bigger turbo and the same size injectors
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Old 12-08-2016, 01:48 PM   #3
TopSpeed
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Quote:
Originally Posted by NeverGoingback View Post
Very Nice build! Just a question for you but what was the injector duty like on E85? I only ask because I am running an almost identical setup, minus the Dom 2.5. Im running a blouch td06 20g xtr, and Cobb 1000cc injectors. My tuner only felt comfortable running them up to a little less than 90%. The car put down 390 on 91 @ 23psi, and 411 on E85 @ 17 psi. I was told that I would need 1000+ injectors to run more fuel on e85, but here you are running a bigger turbo and the same size injectors
We typically run out of fuel on stock stock fuel system with 1000cc injectors and a pump around the 430-440whp mark. With a better regulator with a higher base pressure and a pump that will support the pressure we have seen just over 500whp on 1000cc injectors on true E85 on Subarus.

The 477whp pull was 96% injector duty cycle at about 12.0 AFR at redline. As we were turning it up, 440whp and a little richer was 93% IDC for reference. With a good quality injector like the ID stuff we run in our Subaru's and GTR's we have always had good results running them at high pressure and high duty cycle.
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Old 01-24-2017, 05:53 PM   #4
tgtrefz
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I'm running the Dom 2.5 8 cm with ID1000 and dw65c. i'm at 97% IDC at 22psi. I wonder if i'm running out of pump. stock fpr
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Old 01-24-2017, 09:50 PM   #5
rexworx
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^^^ Yes you're running out of pump... I was to with they same setup but with Kelford cams etc and a 65c. Get a AEM320 PN 50-1215. That's what I ended up going to but also switched a bunch of other stuff. Looking through my logs though. You can deff see I was running out of pump volume.

Last edited by rexworx; 01-24-2017 at 09:56 PM.
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Old 05-30-2017, 01:50 PM   #6
MMFA
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Quote:
Originally Posted by rexworx View Post
^^^ Yes you're running out of pump... I was to with they same setup but with Kelford cams etc and a 65c. Get a AEM320 PN 50-1215. That's what I ended up going to but also switched a bunch of other stuff. Looking through my logs though. You can deff see I was running out of pump volume.
The AEM 320 is a great pump but with 1000s you're still going to run out of fuel in the low to mid 400s whp on E85 or low to mid 500s on gasoline based fuels. The easiest way to go further with the fuel system is to simply upgrade to 1300s - those coupled with an AEM 320 will get you to the low 500s on E85. Anything more than that I would go with a Walbro 485 12v modded in the stock basket.
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Old 05-31-2017, 08:49 AM   #7
rexworx
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PPG,4.44,LSD,E85,6spdx3

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You are correct. The ID1000s are in my11hatch. Im running the 1300s in my05sedan. Then a set of FIC1100s in my04fxt.
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Old 06-07-2019, 09:05 AM   #8
QwaktastiK
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TopSpeed, what size hotside did you guys do with on this? 10cm?
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Old 06-11-2019, 10:45 PM   #9
dingobite
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Ive almost a identical setup making 402hp, 412tq, last block was making 400hp 397tq both on 93 i have the 8cm 2.5xtr.

you might need to call them post is from 2016 i was told just recently they only tune subarus they work on so many nissan GT R these days.
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Old 06-18-2019, 02:31 PM   #10
Todd_wrx
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I have almost the same as well. A few extra goodies but on a stock block. At 375/375. I think Iím being held back by Canadian gas.
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