Compression ratio - Subaru WRX Forum
 
LinkBack Thread Tools Display Modes
#1 Old 02-01-2009, 07:55 PM
WRXtuners Member
 
wrxshotta's Avatar
 
Join Date: Jun 2008
Location: Florida
Posts: 151
wrxshotta is on thin ice
Compression ratio

Sorry for this question but i need a proper answer and i seem to find a different amount of answers...what is the stock compression ratio on a EJ 205...because i am ordering pistons tomorrow and i need to know what ratio to choose
wrxshotta is offline  
Sponsored Links
Advertisement
 
#2 Old 02-02-2009, 09:01 AM
WRXpert
 
dumdum's Avatar
 
Join Date: Sep 2004
Location: Virginia
Posts: 2,800
Images: 12
dumdum is a WRX tech God, pay attention dumdum is a WRX tech God, pay attention dumdum is a WRX tech God, pay attention dumdum is a WRX tech God, pay attention dumdum is a WRX tech God, pay attention dumdum is a WRX tech God, pay attention dumdum is a WRX tech God, pay attention dumdum is a WRX tech God, pay attention
8.2:1 I would go with 8.5:1 as most companies just do half increments.

Homebrewed tuned with Opensource!
dumdum is offline  
#3 Old 02-02-2009, 09:52 AM
WRXtuners Member
 
baller_v24's Avatar
 
Join Date: Oct 2006
Location: Texas
Posts: 1,469
baller_v24 is known to be trustworthy and helpful baller_v24 is known to be trustworthy and helpful
Send a message via Yahoo to baller_v24
i thought it was 8.0:1

http://ken-gilbert.com/wrx/mans/3%20...C%20ENGINE.PDF

rollin on 17's now and they're dirty
baller_v24 is offline  
#4 Old 02-02-2009, 12:09 PM
WRXpert
 
dumdum's Avatar
 
Join Date: Sep 2004
Location: Virginia
Posts: 2,800
Images: 12
dumdum is a WRX tech God, pay attention dumdum is a WRX tech God, pay attention dumdum is a WRX tech God, pay attention dumdum is a WRX tech God, pay attention dumdum is a WRX tech God, pay attention dumdum is a WRX tech God, pay attention dumdum is a WRX tech God, pay attention dumdum is a WRX tech God, pay attention
/\ Your right.The STI's and 2.5L WRX's are 8.2:1

Homebrewed tuned with Opensource!
dumdum is offline  
#5 Old 02-02-2009, 05:27 PM
WRXtuners Member
 
wrxshotta's Avatar
 
Join Date: Jun 2008
Location: Florida
Posts: 151
wrxshotta is on thin ice
but why is that?, i thought we want to lower compression why are most companies like weisco, cp etc rasing our compression?
wrxshotta is offline  
#6 Old 02-02-2009, 05:46 PM
Moderator
 
mosc's Avatar
 
Join Date: Mar 2005
Location: Pennsylvania
Posts: 6,478
Images: 7
mosc is a helpful contributing member
Garage
Because 8.0:1 and 8.2:1 are really friggin' low. Look, turbos love low compression it's true but more compression does help. You want to find a middle ground that allows for full use of the turbo's efficiency range and utilization of as much of the air as possible. By modern tuning standards, Subaru's compression is on the low side even for a turbo car.

04 STi 16G powered lagless fun
04 WRX: SOLD
mosc is offline  
#7 Old 02-02-2009, 05:57 PM
WRXtuners Member
 
wrxshotta's Avatar
 
Join Date: Jun 2008
Location: Florida
Posts: 151
wrxshotta is on thin ice
gotchaaaa...thanks everyonee
wrxshotta is offline  
#8 Old 02-03-2009, 01:16 AM
WRXtuners Member
 
Join Date: Jul 2008
Location: California
Posts: 143
subarooster is an unknown
Quote:
Originally Posted by dumdum View Post
8.2:1 I would go with 8.5:1 as most companies just do half increments.
half increments?? wanna help me with that one lol??
subarooster is offline  
#9 Old 02-03-2009, 10:07 AM
WRXtuners Member
 
turmic's Avatar
 
Join Date: Jul 2007
Location: Pennsylvania
Posts: 4,371
Images: 6
turmic is a WRX expert worth listening to turmic is a WRX expert worth listening to turmic is a WRX expert worth listening to turmic is a WRX expert worth listening to
Send a message via AIM to turmic
You don't know math? Just kidding...they make pistons in half increments man. Think about it.

8.0:1
8.5:1
9.0:1

and so on....
turmic is offline  
#10 Old 02-03-2009, 11:24 PM
WRXtuners Member
 
Join Date: Jul 2008
Location: California
Posts: 143
subarooster is an unknown
ohhhhhhh ok. thnx
subarooster is offline  
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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 On
Trackbacks are On
Pingbacks are On
Refbacks are On