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Old 12-04-2005, 07:52 PM   #1
Jon [in CT]
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Default Anyone from Australia with the 2.5L 9.0:1 compression WRX?

I was reading the specs of the Australian 2006 WRX and saw at http://subaru.com.au/explore/impreza...edan&grade=WRX that its compression ratio is 9.0:1, whereas the US WRX only claims an 8.4:1 compression ratio. How come the Aussie WRX is rated at only 169 kW (227 hp)?

Any owners on the board?
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Old 12-04-2005, 08:52 PM   #2
Uncle Scotty
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....and 4.44 final drive, too....
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Old 12-04-2005, 09:04 PM   #3
e30
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Is the 4.44 a misprint ? or did they get the fxt box? with 9.1 com and 4.44 tdo4 I bet that thing has some wicked responce
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Old 12-05-2005, 01:14 AM   #4
ebeck
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Ya that is way nice man.
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Old 09-12-2016, 10:45 PM   #5
ej2007
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I know this is old. But I was thinking about 9:1 pistons in my ej255 build with a 18g turbo. Thoughts?
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Old 09-12-2016, 11:47 PM   #6
ej2007
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I found this

"My personal experience...I ran 9.77:1 CR on my bugeye and saw 380whp/370wtq @ 24psi of boost on an 8cm FP Red with 93oct. A customer's car had an almost identical setup but with 8.5:1 CR. He saw 393whp/388wtq @ 26psi of boost on an 8cm FP Red with 93oct. To summarize my point, I saw HUGE gains in off-boost driveability and fuel economy with the increased CR, and while knock did limit how much timing and boost I could run, I wouldn't really say I was limited significantly over the stock compression setup."
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