Welcome to the North American Subaru Impreza Owners Club Wednesday May 4, 2016
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC General > Proven Power Bragging

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 02-21-2013, 09:14 PM   #176
Slimsti
Scooby Specialist
 
Member#: 155696
Join Date: Aug 2007
Chapter/Region: Tri-State
Location: New Jersey
Vehicle:
2007 BLK STI Dom3XTR
415/405 Precision Tuning

Default

I just love your build. You have basically the same setup I want on my next project. Rotated is the way to go.
* Registered users of the site do not see these ads.
Slimsti is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 12-29-2013, 01:47 AM   #177
pet3r
Scooby Specialist
 
Member#: 283134
Join Date: May 2011
Location: AZ
Vehicle:
2008 STi AW
550whp - 530wtq

Default

Car is back in my possession Unfortunately it has a hg failure Went with the oem subaru HG with this build, so not sure what I should use when I change it out. Recommendations?

Going with some new built heads from Curt Brown (the recent TPG build showed off his awesome work)...full bowl blend port, ferrea valves, gsc beehives, gsc s1 cams, etc. Curious how you all think this will effect the power band I'm hoping to keep low end good, but let it breathe more. If I can hit the same power at 25psi that would rock!!!

I'm also debating whether to swap out the rods, since I just have manley h-beams. Kicking myself for not requesting i-beams with the Rallispec block
pet3r is offline   Reply With Quote
Old 12-29-2013, 02:16 AM   #178
rustler753
Scooby Newbie
 
Member#: 372764
Join Date: Nov 2013
Default

Quote:
Originally Posted by pet3r View Post
Car is back in my possession Unfortunately it has a hg failure Went with the oem subaru HG with this build, so not sure what I should use when I change it out. Recommendations?

Going with some new built heads from Curt Brown (the recent TPG build showed off his awesome work)...full bowl blend port, ferrea valves, gsc beehives, gsc s1 cams, etc. Curious how you all think this will effect the power band I'm hoping to keep low end good, but let it breathe more. If I can hit the same power at 25psi that would rock!!!

I'm also debating whether to swap out the rods, since I just have manley h-beams. Kicking myself for not requesting i-beams with the Rallispec block
Same boat as me. What pressures were you running daily that lead to failure?

1) Go with the I-beams...I did and grateful looking back at all the money I've spent on the block. If you are dropping it for headwork, might as well. You still have the potential for failure at 500whp+ for h-beams, it'll be something less to worry about

2) My builder at ASF Machine recommended to go with a +1mm exhaust size and leave intake alone on valves. That coupled with headwork should shift power slightly to the left if anything.

Similar builds that I've seen have done 500whp+ at 25psi with no headwork, so there is that.
rustler753 is offline   Reply With Quote
Old 12-29-2013, 02:29 AM   #179
pet3r
Scooby Specialist
 
Member#: 283134
Join Date: May 2011
Location: AZ
Vehicle:
2008 STi AW
550whp - 530wtq

Default

It had peak at 29psi, but really didn't see it much. I had sold the car to a friend, and he ran it around 25psi max on E85. The last month he was driving on 93pump around 20-21psi I believe. So the pressure's weren't huge

I spoke with guys at Headgames and he said that +1 valves are really unnecessary, unless you want to push 800hp. I don't
pet3r is offline   Reply With Quote
Old 12-29-2013, 12:59 PM   #180
Irv Weissmanhowerton
Scooby Specialist
 
Member#: 278519
Join Date: Apr 2011
Chapter/Region: SCIC
Location: Phatbotti
Vehicle:
30r E85 sti 450+whp
kb'izzle

Default

Go with stock hg again, it wasnt the fact it was a stock head gasket that caused the failure,do not go with the cometic, and not sure I would even trust the cosworth as well as oem hg, try it again maybe with a more rep. builder or ask for more precise work done and ask to be shown clearances or make sure torque plates are used during honing and all that

Thats odd about the headgames comment of +1 not being needed til 800hp, it helps velocity with a decent sized turbo, & I'm SURE it helps at 550+whp
Irv Weissmanhowerton is offline   Reply With Quote
Old 12-29-2013, 04:11 PM   #181
bjohnson_55
Scooby Specialist
 
Member#: 216580
Join Date: Jul 2009
Chapter/Region: MWSOC
Location: INDY
Default

Quote:
Originally Posted by Irv Weissmanhowerton View Post
Go with stock hg again, it wasnt the fact it was a stock head gasket that caused the failure,do not go with the cometic, and not sure I would even trust the cosworth as well as oem hg, try it again maybe with a more rep. builder or ask for more precise work done and ask to be shown clearances or make sure torque plates are used during honing and all that

Thats odd about the headgames comment of +1 not being needed til 800hp, it helps velocity with a decent sized turbo, & I'm SURE it helps at 550+whp
Good info. Just adding a couple things. Definitely true about not using cometic. Im not a fan either.
Make sure the builder understands the importance of a good surface finish for the hg to mate properly. You should be fine with standard arp studs.
bjohnson_55 is offline   Reply With Quote
Old 12-30-2013, 01:53 PM   #182
xluben
Scooby Guru
 
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:
2002 WRX - 750WHP
9.5s @ 150mph

Default

Stock head gaskets.
Stock size valves.
I beam rods.
ARP 625+ headstuds.
xluben is offline   Reply With Quote
Old 12-30-2013, 06:13 PM   #183
HeadGames Motorworks
Former Vendor
 
Member#: 323899
Join Date: Jun 2012
Default

we make double that with stock size valves (1k whp)

Stock size valve flows better at lower lifts, and the 45 degree seat angle is not at the edge of the seat as it is with the 1mm.
HeadGames Motorworks is offline   Reply With Quote
Old 03-10-2014, 09:30 PM   #184
pet3r
Scooby Specialist
 
Member#: 283134
Join Date: May 2011
Location: AZ
Vehicle:
2008 STi AW
550whp - 530wtq

Default

Car is under the knife now...lots of updates coming from the original build.

We pulled the engine for the HG failure and had very poor leakdown results. Everything looked fine though...no scoring, pistons looked good, cross hatch was there, oil was clean, no consumption either. We decided to open the block because the leakdown was so bad and just rehone with new rings to make sure it was fine.

My 704 case halves were out of round when we went to re-hone. I've never heard of this so I'm not sure what to think :/ Cosworth pistons had some damage at the wrist-pins and the machine shop said they probably shouldn't be used. I took this as a hint to build a better block that can handle the power

Changes coming:
-Outfront Motorsports closed deck block
-full ported W25 heads from Curt Brown
-ferrea valves, gsc beehives, GSC S1 cams, CA65 head studs
-new CP pistons @ 9:1 CR, Manley I-beams, fully balanced to .25g

Next week will be a good week...fingers crossed.
pet3r is offline   Reply With Quote
Old 03-10-2014, 09:36 PM   #185
Paul
Scooby Guru
 
Member#: 56203
Join Date: Feb 2004
Chapter/Region: Tri-State
Location: south nj
Vehicle:
00 RSTI Coupe
Twin Scroll 2.5XTR EJ207

Default

Quote:
Originally Posted by pet3r View Post
My 704 case halves were out of round when we went to re-hone. I've never heard of this so I'm not sure what to think :/ Cosworth pistons had some damage at the wrist-pins and the machine shop said they probably shouldn't be used. I took this as a hint to build a better block that can handle the power
Out-of-round is proly from the machine work being done without a TQ plate


This time around I'd upgrade the piston pins to Tool Steel or another stronger pin
Paul is offline   Reply With Quote
Old 03-10-2014, 09:46 PM   #186
pet3r
Scooby Specialist
 
Member#: 283134
Join Date: May 2011
Location: AZ
Vehicle:
2008 STi AW
550whp - 530wtq

Default

Quote:
Originally Posted by Paul View Post
Out-of-round is proly from the machine work being done without a TQ plate This time around I'd upgrade the piston pins to Tool Steel or another stronger pin
No torque plates on original bore or from the new home?

Which pins do you recommend?
pet3r is offline   Reply With Quote
Old 03-10-2014, 09:53 PM   #187
Paul
Scooby Guru
 
Member#: 56203
Join Date: Feb 2004
Chapter/Region: Tri-State
Location: south nj
Vehicle:
00 RSTI Coupe
Twin Scroll 2.5XTR EJ207

Default

Quote:
Originally Posted by pet3r View Post
No torque plates on original bore or from the new home?
IDK what that means but I doubt Rallispec used plates on your previous motor


For the pins ask your builder or piston manufacture for a stronger pin and they will hook you up
Paul is offline   Reply With Quote
Old 03-10-2014, 10:26 PM   #188
Equilibrium Tuning
Former Vendor
 
Member#: 26933
Join Date: Oct 2002
Chapter/Region: BAIC
Location: Fairfield, CA
Vehicle:
2006 STI
CGM

Default

What head studs were you running?

-- Ed
Equilibrium Tuning is offline   Reply With Quote
Old 03-10-2014, 11:00 PM   #189
pet3r
Scooby Specialist
 
Member#: 283134
Join Date: May 2011
Location: AZ
Vehicle:
2008 STi AW
550whp - 530wtq

Default

Thanks Paul.

EQ - was running standard arp studs before.
pet3r is offline   Reply With Quote
Old 03-11-2014, 12:32 AM   #190
Equilibrium Tuning
Former Vendor
 
Member#: 26933
Join Date: Oct 2002
Chapter/Region: BAIC
Location: Fairfield, CA
Vehicle:
2006 STI
CGM

Default

Quote:
Originally Posted by pet3r View Post
Thanks Paul.

EQ - was running standard arp studs before.
Might be part of the problem. I've seen a couple instances of heads lifting with high boost on standard ARP's. Switched to MAP H11 studs and no more problems.

-- Ed
Equilibrium Tuning is offline   Reply With Quote
Old 03-11-2014, 12:33 AM   #191
pet3r
Scooby Specialist
 
Member#: 283134
Join Date: May 2011
Location: AZ
Vehicle:
2008 STi AW
550whp - 530wtq

Default

Yep, thats why I bought CA65 studs
pet3r is offline   Reply With Quote
Old 03-12-2014, 11:36 PM   #192
pet3r
Scooby Specialist
 
Member#: 283134
Join Date: May 2011
Location: AZ
Vehicle:
2008 STi AW
550whp - 530wtq

Default

Look what came today Thanks Outfront!

pet3r is offline   Reply With Quote
Old 03-13-2014, 12:32 AM   #193
NA STI
Scooby Specialist
 
Member#: 285083
Join Date: Jun 2011
Chapter/Region: MAIC
Location: Newport News, VA
Vehicle:
2006 STi
WRB

Default

Looks good man, sounds like you doing it right. Good luck with the rebuild process
NA STI is offline   Reply With Quote
Old 03-13-2014, 10:23 AM   #194
xluben
Scooby Guru
 
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:
2002 WRX - 750WHP
9.5s @ 150mph

Default

702 case. I like.
xluben is offline   Reply With Quote
Old 03-13-2014, 10:33 AM   #195
subbi7
Scooby Newbie
 
Member#: 241967
Join Date: Mar 2010
Vehicle:
02 wrx

Default

There are any difference between the blocks (702,703,704)?
Sorry if it anoob question...
subbi7 is online now   Reply With Quote
Old 03-13-2014, 10:51 AM   #196
pet3r
Scooby Specialist
 
Member#: 283134
Join Date: May 2011
Location: AZ
Vehicle:
2008 STi AW
550whp - 530wtq

Default

The latest 704 castings have been known to be weaker and crack more easily. Happy I got a 702 as well
pet3r is offline   Reply With Quote
Old 03-13-2014, 11:48 AM   #197
WRXt4cy
Scooby Specialist
 
Member#: 172698
Join Date: Feb 2008
Chapter/Region: MWSOC
Location: Des Moines, IA
Vehicle:
11 STi BW 8374 E85
02 v8 Spec C E85

Default

Excellent choice on the short block.

I ended with a 702 casting as well which I was happy about.

What specs did you have yours built to?
WRXt4cy is offline   Reply With Quote
Old 03-13-2014, 11:54 AM   #198
pet3r
Scooby Specialist
 
Member#: 283134
Join Date: May 2011
Location: AZ
Vehicle:
2008 STi AW
550whp - 530wtq

Default

Their standard bore is 99.75, you actually can't order it at 99.5 from what they told me. Don't know how much more you could customize a block
pet3r is offline   Reply With Quote
Old 03-13-2014, 12:21 PM   #199
pet3r
Scooby Specialist
 
Member#: 283134
Join Date: May 2011
Location: AZ
Vehicle:
2008 STi AW
550whp - 530wtq

Default

Got the upgraded wrist pins on order. Called CP, they gave me 3 different options, all of which are a tool steel material with a hardened surface, but 3 different wall thicknesses:
-190 wall
-200 wall
-260 wall

I went with the 200, hope it won't be too heavy. They told me to call Race Engineering and gave me the part # for anyone interested: 905-2500-20-CP3S
pet3r is offline   Reply With Quote
Old 03-13-2014, 01:59 PM   #200
WRXt4cy
Scooby Specialist
 
Member#: 172698
Join Date: Feb 2008
Chapter/Region: MWSOC
Location: Des Moines, IA
Vehicle:
11 STi BW 8374 E85
02 v8 Spec C E85

Default

Quote:
Originally Posted by pet3r View Post
Their standard bore is 99.75, you actually can't order it at 99.5 from what they told me. Don't know how much more you could customize a block



I assumed they were assembling a whole bottom end for you and this was just a picture of the case halves for you build. My mistake.

Let me rephrase: What specs are you building it to?

The only other option you might have opted for would be the machining for 1/2 studs but I'm guessing you skipped that.
WRXt4cy is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 07:52 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2016 Axivo Inc.
Copyright ©1999 - 2016, North American Subaru Impreza Owners Club, Inc.