Please chime in here
Pr0n King
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No complications, I just have a weird feeling that the heads/cams are pretty maxed out currently on the 2.0l motor. With an additional .5l of swept volume you're going to be sucking through a straw. You'll definitely see a boost in power, but the gains will be kept in check due to a limit in airflow through the heads/valves.
The EJ207 in Japan has heads that flow considerably more than the USDM WRX motor (2.0l). Imagine throwing another .5l into the mix and asking the stock heads to handle the breathing requirements.
It's like putting a set of stock BB Chevy oval port heads (from a truck motor) onto a 509cid stroker. It would really benefit from a set of massaged rectangle port flow-monsters...
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The EJ207 in Japan has heads that flow considerably more than the USDM WRX motor (2.0l). Imagine throwing another .5l into the mix and asking the stock heads to handle the breathing requirements.
It's like putting a set of stock BB Chevy oval port heads (from a truck motor) onto a 509cid stroker. It would really benefit from a set of massaged rectangle port flow-monsters...
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Last edited by IS2Scooby; Jul 9, 2003 at 12:48 AM.
Thanks for the info. Do you have any suggestions to solve the problem?
I have a few friends that visit Japan often and I asked them if they could bring back STi type RA spec C heads for me. Will this fit on the USDM STi2.5l?
I have a few friends that visit Japan often and I asked them if they could bring back STi type RA spec C heads for me. Will this fit on the USDM STi2.5l?
Pr0n King
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Those would be an AWESOME complement to a larger displacement motor... They should physically fit. Getting the AVCS hooked up is another matter...
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From: AWD Culture
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Originally posted by IS2Scooby
Those would be an AWESOME complement to a larger displacement motor... They should physically fit. Getting the AVCS hooked up is another matter...
Those would be an AWESOME complement to a larger displacement motor... They should physically fit. Getting the AVCS hooked up is another matter...
Chris, I thought I already told you that about the heads? 
In any case, those dyno plots that i-speedusa has for the 2.4L against the 2.0L show a good example of what happens with stock heads on a ~2.5L block with no tuning, and then with a little tuning. I've posted that link at least a few times.
In any case, those dyno plots that i-speedusa has for the 2.4L against the 2.0L show a good example of what happens with stock heads on a ~2.5L block with no tuning, and then with a little tuning. I've posted that link at least a few times.
Pr0n King
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I've been told by a little Birdie that there is an AWD dyno landing on this island in <1 month.
You didn't hear it from me.
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You didn't hear it from me.
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Pr0n King
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(Then again I've been disappointed before, so I'm not getting overly excited)
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Pr0n King
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Originally posted by 18hrwrx
Why do you need to hook up the AVCS? It just gets in the way when your making big power anyway
Why do you need to hook up the AVCS? It just gets in the way when your making big power anyway
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Originally posted by IS2Scooby
I've been told by a little Birdie that there is an AWD dyno landing on this island in <1 month.
You didn't hear it from me.
I've been told by a little Birdie that there is an AWD dyno landing on this island in <1 month.
You didn't hear it from me.
I hope it gets here before Shiv does. 
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