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Old 05-21-2009, 04:36 AM   #1
spoolinsti05
Scooby Specialist
 
Member#: 108051
Join Date: Feb 2006
Chapter/Region: Tri-State
Location: NY
Vehicle:
2005 TickingTimeBomb
Jr tuned TT Sleeved

Default stock block with high compression pistons what do you guy's think?

I was going to do sleeves but can't afford to do that and what i want to do to the head's fuel system and all that. But heres my thought's on the block.


Stock bore 99.5 maybe 99.75?

I most likely will go with wiesco pistons, or CP with coated skirts. I want 8.5:1 compression. maybe 9.0:1 ? If I have to I'll run E85 daily I'll just buy 2 55gl drum's and keep them in the shop. It's cheaper and higher octane. But with the right head work and clearances the motor should be able to make good power on 93 octane right? maybe lower boost like 22psi.

I'm thinking Manley rod's cosworth race 0 size race bearing's.

08 sti oil pump.

K1 crank. + more
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Old 05-21-2009, 08:10 AM   #2
n2oiroc
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Member#: 141952
Join Date: Feb 2007
Chapter/Region: MWSOC
Location: milwaukee, wi
Vehicle:
03 emo 8/2011 wrx

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i run 22 psi daily on my 9.5:1 35r sti on 93 octane. stock heads and cams. higher compression is more time consuming to tune, but in the end power is the same with better driveability and slightly better spool.

07 sti.
ar fab built shortblock with 9.5:1 arias pistons, manley rods and blueprinted bottom end.
stock heads and cams.
modified u.r. gt3582r kit with .82 a/r v-band discharge turbine.
tial 44 with 1.4 bar springs.
maddad v2 header and whisper catback.
perrin fmic.
deatschwerks 1,150cc top feeds.
boomba racing fuel rails, fuelab regulator and walbro 255.
4" filter on turbo inlet.
hydra 2.6.
tgv deletes.

blue is strait 93 @21-22 psi and red is 50% 93 and 50% q16 @28 psi. both are uncorrected, corrected it came out to 420 whp and 540 whp. it had plenty left, but i was out of injector and was worried about the headgaskets.

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Old 05-21-2009, 04:51 PM   #3
Built Industries
NASIOC Vendor
 
Member#: 33839
Join Date: Mar 2003
Chapter/Region: South East
Location: Sanford Fl
Vehicle:
2002 WRX
Black

Default

Quote:
Originally Posted by spoolinsti05 View Post
I was going to do sleeves but can't afford to do that and what i want to do to the head's fuel system and all that. But heres my thought's on the block.


Stock bore 99.5 maybe 99.75?

I most likely will go with wiesco pistons, or CP with coated skirts. I want 8.5:1 compression. maybe 9.0:1 ? If I have to I'll run E85 daily I'll just buy 2 55gl drum's and keep them in the shop. It's cheaper and higher octane. But with the right head work and clearances the motor should be able to make good power on 93 octane right? maybe lower boost like 22psi.

I'm thinking Manley rod's cosworth race 0 size race bearing's.

08 sti oil pump.

K1 crank. + more
9.5:1 - 10.0:1 = GOOD STUFF
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Old 05-21-2009, 06:26 PM   #4
Fongers
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Member#: 118239
Join Date: Jun 2006
Chapter/Region: SCIC
Location: Beijing and Venice Beach
Vehicle:
2002 Built Wagon
Wife- 2004 Outback SE

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Make sure you have a good tuner. N2 got great numbers but I'm always wary of running 20+ psi on more than 9:1 as its is hard to tune but is very doable...
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Old 05-22-2009, 08:12 AM   #5
Paul
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Member#: 56203
Join Date: Feb 2004
Chapter/Region: Tri-State
Location: south nj
Vehicle:
00 RSTI Coupe
Twin Scroll 2.5XTR EJ207

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I would stay with stock like comp or lower. Go low and run higher boost on st8 pump and you could make great numbers on e85

Higher compression doesnt make a big enough difference to deal with all the det that comes along with it.....check out N2oiroc thread in PPB and youll notice some tuners saying the same thing
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Old 05-22-2009, 11:47 AM   #6
WrXtaCy2003
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Member#: 85036
Join Date: Apr 2005
Chapter/Region: MWSOC
Vehicle:
2013 PBP sti ltd
05 LGT 35r 30psi..busted

Default

I have around 9.2 or so and I LOVE it. All I did was switch from the Cometic .051 to the stock sti gasket, and the off power boost was dramatically increased. The car also hits peak boost ~300rpms sooner (I have logs, I did not just make this up). I'm in the process of putting together a 10:1 long rod motor. Tuning will not be a pain at all because I run e85 all the time. Don't be warned off by everybody, most of these people are just repeated things that they have heard. I have no problem tuning my car at 23 psi on pump with my 9.2-9.3 setup.

DK
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Old 05-31-2009, 03:06 AM   #7
spoolinsti05
Scooby Specialist
 
Member#: 108051
Join Date: Feb 2006
Chapter/Region: Tri-State
Location: NY
Vehicle:
2005 TickingTimeBomb
Jr tuned TT Sleeved

Default

You both have nice set ups. But I want the power band to be broader. say about 23psi by 4k rpm's pulling all the way to 8k rpm's. And keeping the power and tq curve flat across that's what I would love to have................Maybe some PPG's after that
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