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Old 07-31-2014, 01:37 PM   #1
Peter_WRX
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Member#: 313620
Join Date: Mar 2012
Vehicle:
2005 Impreza 2.5 STI
black devil

Default Building 400HP STI

In my stock subaru 2.5 sti 2005 was damaged piston. Now I'm in the process of renovating and preparing the car to the 400hp power. Below is a list of things that have been done in the car. What do you think about my new the setup?

Should I still make additional modifications for this power ?

ENGINE MODIFICATIONS
Manley 99.75 Pistons
Manley H-Beam Rods
Heat Treated Crankshaft (STI 2011+)
Main / Rods bearings ACL RACE
OEM head gaskets
ARP head studs/nuts
11mm oil pump (STI 2011)
Strengthened cylinder walls (aftermarket pegging)






Upgrade to 6 additional straight pins between crank cases (there are only 2 as standard and block may be unstable)



OTHER MODIFICATIONS
Scoobieclinic SC40 turbocharger
(TD05-20G 7cm, comp wheel 53mm / 68mm )
FMIC Autobahn88 CARP027
APS Twin Vent blowoff valve
Silicone turbo inlet Autobahn88
DW 850cc injectors side feed
Walbro 255l/h fuel pump
Setrab 16 Row Oil Cooler

Thank you for all opinions.
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Old 07-31-2014, 02:28 PM   #2
user1029
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Member#: 57064
Join Date: Mar 2004
Vehicle:
2008 STi IAG built
HTA86, Meth, 272s, Cos IM

Default

Why peg when you can go outfront closed deck? Those cylinders will still crack with pegging. Get Manley I-beams and ARP Age625 studs because you will want more power in the future. Get ID1300cc injectors and walbro 465 for more headroom. 11mm pump not good if you don't have dual AVCS as killerB can explain.
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Old 07-31-2014, 03:56 PM   #3
Peter_WRX
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Member#: 313620
Join Date: Mar 2012
Vehicle:
2005 Impreza 2.5 STI
black devil

Default

I dont go closed deck so pegs are my sollution for stable cylinders. I can crack cylinder walls at 20-22lb boost on td05 ?

I have installed h-beam rods, standrard arps and 255 fuel pump so i dont want more power at the future.

KillerB is solution for trouble with 11mm pump and single avcs setup ?
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Old 07-31-2014, 04:00 PM   #4
BeastianSTI
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Member#: 310506
Join Date: Feb 2012
Chapter/Region: South East
Location: Florida
Vehicle:
2005 WRX STi
Silver, Sexy 'n Raspy

Default

No, you should use the 10mm with the 2005 STi. The 11mm pushes more volume at slightly less pressure at higher RPMs. This causes oil aeration in our cars. Just stahp
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Old 07-31-2014, 04:05 PM   #5
fastblueufo
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Member#: 212154
Join Date: May 2009
Chapter/Region: South East
Location: Ed@fastperformancetuning.com
Vehicle:
02 billet crank
pauter rods, pt5857, E85

Default

Quote:
Originally Posted by user1029 View Post
Why peg when you can go outfront closed deck? Those cylinders will still crack with pegging. Get Manley I-beams and ARP Age625 studs because you will want more power in the future. Get ID1300cc injectors and walbro 465 for more headroom. 11mm pump not good if you don't have dual AVCS as killerB can explain.
He has an sti with avcs. He will need an 11mm pump and especially if his engine is built to handle 400 or more hp. Have you ever looked at oil pressure on a 10mm in an sti with around .0015 clearance on mains and around .002-.0025 on rods? With 10w30 you get about 12psi at idle and 40psi at 3000 rpm. With those clearances you need all the flow you can get. With an 11mm on 10w30 you get slightly better but with the 11mm it will pump 40w or 50th a lot better than a 10mm will. Thus bringing you pressure up to around 18psi at idle and 55 to 60 at 3000 rpm.
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Old 07-31-2014, 08:10 PM   #6
cartoonlife
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Member#: 204291
Join Date: Feb 2009
Chapter/Region: BAIC
Location: Central CA
Vehicle:
07 UGM STi Ltd
2012 Prius

Default

NO on the 11mm pump unless you have ridiculously opened up those clearances. Everything you've listed is great for 400awhp. Good luck
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Old 08-01-2014, 05:32 AM   #7
Peter_WRX
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Member#: 313620
Join Date: Mar 2012
Vehicle:
2005 Impreza 2.5 STI
black devil

Default

Thank you very much for your feedback.

What about cylinder walls with this power ? May break or not worry about it ?
And what you think about upgrade to 6 additional straight pins between crank cases ?
Killer B Motorsport Oil Baffle Windage Tray is necessary for EJ257 engine ?
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Old 08-01-2014, 06:02 AM   #8
Bru1212
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Join Date: Apr 2008
Chapter/Region: NESIC
Location: Western,MA
Vehicle:
06 STi
04 FXT

Default

Quote:
Originally Posted by Peter_WRX View Post
Thank you very much for your feedback.

What about cylinder walls with this power ? May break or not worry about it ?
And what you think about upgrade to 6 additional straight pins between crank cases ?
Killer B Motorsport Oil Baffle Windage Tray is necessary for EJ257 engine ?
Not necessary but I'd say their pickup tube would be. The windage tray is a "mine as well while your there" kind of thing.
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Old 08-01-2014, 01:32 PM   #9
user1029
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Member#: 57064
Join Date: Mar 2004
Vehicle:
2008 STi IAG built
HTA86, Meth, 272s, Cos IM

Default

Quote:
Originally Posted by Peter_WRX View Post
Thank you very much for your feedback.

What about cylinder walls with this power ? May break or not worry about it ?
And what you think about upgrade to 6 additional straight pins between crank cases ?
Killer B Motorsport Oil Baffle Windage Tray is necessary for EJ257 engine ?
You won't break the cylinder walls at those power levels. Since you went through the process/mindset of pegging it, you might as well solidify the whole thing into a closed deck is the point I was getting at

Essentially if you closed deck it, get I-beams, get ARP625s, you have a block that can potentially handle up to 900-1000 crank HP, talk about headroom
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Old 08-01-2014, 02:47 PM   #10
SDoBB
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Member#: 335853
Join Date: Oct 2012
Chapter/Region: Tri-State
Location: Buffalo
Vehicle:
2013 WRX 5 Door
CBS

Default

Quote:
Originally Posted by Bru1212 View Post
Not necessary but I'd say their pickup tube would be. The windage tray is a "MIGHT as well while your there" kind of thing.
Fixed that for ya.
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Old 08-02-2014, 12:13 AM   #11
m.bryant
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Join Date: Feb 2012
Chapter/Region: MWSOC
Location: Pleasant Hill, IA
Vehicle:
2007 Legacy GT SpecB
DGM

Default

Quote:
Originally Posted by SDoBB View Post
Quote:
Originally Posted by Bru1212 View Post
Not necessary but I'd say their pickup tube would be. The windage tray is a "MIGHT as well while YOU'RE there" kind of thing.
Fixed that for ya.
Fixed that for ya.
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