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Old 11-16-2021, 01:45 AM   #1
Supafly_NZ
Scooby Newbie
 
Member#: 523983
Join Date: Apr 2021
Location: New Zealand
Vehicle:
2008 WRX STi Impreza

Default 440HP - 2008 JDM WRX STi EJ207 : 2.1L Dom 1.5XTR 10cm 3" on E85

Hey all,

Have been a long time lurker! NASIOC has been a huge source of info for me so thought it was time to post a build thread.
Engine went click-clack at the last track day so opted to pull it out and do a full rebuild.
At the time of writing, car is currently being rebuilt. Hoping to see a little over 400HP on E85.

Block:
EJ207 W20C (Closed Deck S20C Block Replacement)
Subaru STI 2.5L Black Nitride Crank Shaft
JE Subaru EJ20 Forged Stroker Piston Set Bore Size: .5 oversize, Compression Ratio: 8.5:1
Manley Subaru WRX/STI (EJ18/20/22/25) H Beam Connecting Rod Set
ARP 625+ Custom Age Subaru EJ20/25 Head Stud
Subaru EJ20/EJ22/EJ25 (For Rear Thrust) (Size STD) Performance Main Bearing Set
Subaru EJ20/EJ22/EJ25 (Size STD) Tri-Metal Perf Rod Bearing Set
12mm Oil Pump
PBMS Oil Gallery Modification
PBMS Stage 1 Baffled Sump
IAG Timing Belt Guide
Fluidampr Subaru EJ Series Steel Internally Balanced Damper
Killer B Motorsport Ultimate Oil Pickup
Killer B Oil Baffle

Heads:
Performance Valve Seat Reface
PBMS Stage 1 Cylinder Head Porting
Heavy Duty Valve springs drop in
Kelford Cams 272 V11
IAG TGV Delete Kit

Turbo/Intake:
Blouch Dominator 1.5XTR Twin Scroll 10cm 3" inlet
Killer B EJ Cast Aluminum Turbo Inlet 3"
Process West Front Mount intercooler kit - Black
Turbosmart BOV Race Port GEN V Black
Radium Engineering Subaru STi Air Oil Separator Kit

Fuel:
ID1300X Injectors
Radium Surge Tank
Turbosmart Fuel Filter & Billet Bracket
Link Flex-Fuel Ethanol Content Sensor
Radium Fuel Rail / Line

Drivetrain:
Xtreme Extra Heavy Duty Organic Clutch kit with upgraded pressure plate

Other:
Killer B Upper Coolant Fill Tank

Engine Management:
Syvecs S7i Plug and Play ECU with Bluetooth Module
EMTron PnP ECU

Pics here https://www.instagram.com/addctv.wrx/





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Last edited by Supafly_NZ; 05-09-2022 at 11:27 PM. Reason: Changed parts out
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Old 11-23-2021, 08:37 AM   #2
16HikariSTi
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Member#: 527501
Join Date: Nov 2021
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Beautiful car. Love the black.
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Old 12-06-2021, 09:53 PM   #3
ogboot
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Member#: 170906
Join Date: Feb 2008
Chapter/Region: RMIC
Vehicle:
2002 WRX
psm

Default

I also have a stroker, itís an overbored usdm ej205. Iíve been running a 16g-xtr, but I have a DOM 1.5xtr 8cm going on in about a month.

Single scroll so 8cm for me, interested for more details on your setup.
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Old 12-06-2021, 10:26 PM   #4
K3rm1tth3fr0g
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Member#: 508105
Join Date: Nov 2019
Chapter/Region: NWIC
Location: Greater Seattle Area
Vehicle:
Link tuned 02 WRX
EJ205 20G-XTR JDM 6MT E85

Default

Dyno sheet!!!
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Old 12-14-2021, 03:42 PM   #5
Supafly_NZ
Scooby Newbie
 
Member#: 523983
Join Date: Apr 2021
Location: New Zealand
Vehicle:
2008 WRX STi Impreza

Default

Unfortunately still no progress on this.

Possum Bourne Motorsport are having issues with the Syvecs PnP ECU they sold me. I didn't realize til after talking to their tuner, that they'd never supplied and fitted a Syvecs unit and that I'd been apparantly designated as a guinea pig.

On top of that, they've got a staff member down and are way behind on my build. I had to call daily for about a week and a half before someone actually started progress again. (It had been a month of nothing prior to me beginning to chase them).
They also tried to tell me that the Syvecs is a "Race" ECU and isn't designed to run things like air con and other road-car features which is just total BS.

Beyond disappointed in the company at this point but I'll be sure to update once I have it back.
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Old 12-15-2021, 08:25 AM   #6
Black90tsiawd
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Join Date: Jun 2021
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Gorgeous car my man.
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Old 01-11-2022, 04:56 PM   #7
Supafly_NZ
Scooby Newbie
 
Member#: 523983
Join Date: Apr 2021
Location: New Zealand
Vehicle:
2008 WRX STi Impreza

Default

So an update to this. I emplored Possum Bourne Motorsport (PBMS) to get in touch with Syvecs about the issue and asked to be included on all communications going forward.
Thankfully, once Syvecs were on board they were quick to point out that the wrong ECU had been ordered and that for a road-going car, an S7-Plus unit was to be used.

The S7-i unit that was ordered has fewer inputs (designed to run group-n style rally cars - as PBMS had initially thought) and has been returned. Now awaiting a replacement S7-Plus ECU to be shipped out in a couple of weeks time once they have more stock.

I could have instead ordered a CAN expansion unit to gain some more inputs, but for the sake of simplicity, opted to just use the right ECU instead. A Motec unit was questioned, but I really want to take advantage of the Syvecs Bluetooth and Android application on the new headunit I ordered (below).

Besides the ongoing tragedy that is my broken engine, have ordered a few more bits to make the car feel a bit more modern.
Diode-Dynamics smart-tap indicator relay and also the tail-as-turn module, as well as LED's throughout.

Picked up the infamous i-Doing Android headunit off AliExpress.
Looks like a really nice unit from what I could see on the videos, car wasn't connected to power when I visited to install it, so am yet to see it run. But looking forward to (hopefully) getting the Syvecs App installed on it and connected via bluetooth.
This should give me a tonne of functionality without the need to purchase things like Video-CAN adapters and wiring in additional switches etc.


Also bit the bullet on the GRF facelift after sourcing the parts relatively inexpensively:


I do have a CS style front lip to go on once the car's back. Will need to sort paint for the bumper too and will probably tidy up a few other areas on the car while it's in the panel shop.

Last edited by Supafly_NZ; 01-11-2022 at 05:03 PM.
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Old 01-11-2022, 04:56 PM   #8
Supafly_NZ
Scooby Newbie
 
Member#: 523983
Join Date: Apr 2021
Location: New Zealand
Vehicle:
2008 WRX STi Impreza

Default

Bumper is off for respray now. Should have it back with CS Lip to be fitted next week.

Have a set of Verus hood vents and hood scoop blanking plate which I'll also have fitted hopefully before end of next week.

Last edited by Supafly_NZ; 01-25-2022 at 08:17 PM. Reason: Double-post
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Old 03-02-2022, 08:16 PM   #9
Supafly_NZ
Scooby Newbie
 
Member#: 523983
Join Date: Apr 2021
Location: New Zealand
Vehicle:
2008 WRX STi Impreza

Default

Nearing closer.

Verus vents installed.

After months of back and forth, still were having major headaches with getting a Syvecs ECU to work in a JDM car, so have dropped the idea of using the S7 ECU for now and have opted instead to go with a locally available EMtron ECU (Based out of Australia).

Expecting a tune late next week.

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Old 04-19-2022, 10:57 PM   #10
Supafly_NZ
Scooby Newbie
 
Member#: 523983
Join Date: Apr 2021
Location: New Zealand
Vehicle:
2008 WRX STi Impreza

Default

PBMS put this on the dyno last week and sent me a pic (below), and are currently tidying up the 98 Octane (RON) tune before throwing some E85 through it later today/tomorrow.

Initially made 240kw at wastegate pressure of 14psi.
Currently at 283kw at 22psi.

Still unsure if there's anything left in the engine power-wise at this stage as comm's are still pretty cryptic/limited when chatting to Pat, their GM.

Will give a full review & share results later in the week once it's back.

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Old 05-09-2022, 05:19 AM   #11
Supafly_NZ
Scooby Newbie
 
Member#: 523983
Join Date: Apr 2021
Location: New Zealand
Vehicle:
2008 WRX STi Impreza

Default



326kw on E85
303kw on 98 (RON)

Pretty happy with the cars performance. It's as responsive as it was with the original twin-scroll VF49 after the tune so am stoked to have picked up nearly 100kw with identical response.

I have a DAMD wheel on the way also, since they were on special at JapanParts and really give the car a more "race" feel given the diameter and D-shape.
Next mods will likely be a carbon driveshaft to smoothen out some of the jerk in the lower gears (typically 1st, 2nd have a bit of a tendency to "buck" on Sport / Sport # maps given the throttle maps are quite sharp).
In addition to the above, I'd likely go 2-piece (Girodisc) brake rotors and chromoly flywheel to give the car even more response. At a guess I could maybe reclaim 10hp from lightening the drivetrain/removing unsprung mass.

Not really interested in a hunt for more power (yet) but already considering what's required to go EFR7163 with SX-E comp housing and perhaps a Process West / Corsa Veloce intake manifold. The engine is built to handle plenty more power so nice to have some options at least.

Glam' pics for attention (before and after front lip):



Last edited by Supafly_NZ; 05-09-2022 at 05:39 AM. Reason: Formatting
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Old 05-09-2022, 12:58 PM   #12
07imprezRS
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Member#: 164302
Join Date: Nov 2007
Location: Arizona
Vehicle:
11 20 STi, 11 STi
21 WRX, 02 WRX

Default

We donít see to many 2.1 stroker setups like yours here in the states. Cool build, sorry to see all the headaches you went through with regards to the ECU and tuner software.
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