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Old 03-07-2008, 06:58 PM   #1
turboz523
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Default Hybrid 2.5 wrx with n/a 2.5 block

Ok so I've been doing alot of reading on here and trying to get some ideas of which way to go with my wrx. I like the idea of having more torque and power down low associated with a larger block, but the STI shortblocks cost double, triple, or more than what you can pickup a phase 2 n/a 2.5 shortblock for. Now, besides the fact that the sti block is a semi-closed deck vs. the open deck of the n/a 2.5, is there anything else that I need to know, or reason why it wouldn't be good to push to around 350whp using sti rods and a good set of forged pistons? With some porting of the wrx heads and a nicely matched turbo for quick spooling and not too high of boost, seems like it would be a fairly economical build for a fun daily driver.
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Old 03-07-2008, 10:15 PM   #2
ghostdriver
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i think if you get the compression right with those pistons you should be good to go with that plan.
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Old 03-07-2008, 10:59 PM   #3
scubywagon
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with the money you're going to spend on building that na block, you could buy an sti block and save yourself the headache and time of going the na block route. besides, the sti block is designed with boost in mind and the na block is not.....good luck with whatever way you decide to go
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Old 03-08-2008, 01:00 AM   #4
poormansporsche
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On rs25 there are a couple people doing this. Brydon in particular is doing this right now. Should make a good deal of power. Skully did this also and made something like 500whp IIRC.

cheers

poorman
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Old 03-08-2008, 09:25 AM   #5
turboz523
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I've priced the differences of building an n/a block vs. an sti block and there's no comparison. The sti is way more money, I can't even find an sti block thats damaged and needs a rebuild for what I can find an n/a block in good condition for. And as far as parts, I wouldn't really wanna pay the money for a complete running sti block since I'm gonna swap out the pistons anyway. Just seems like the 2.5n/a for a fairly mild build is the way to go. I'll definitely check out the rs25 list to see what they've done.
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Old 03-08-2008, 06:34 PM   #6
ballitch
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Wrx Tranny,slowr than ish

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If your goals are for less than 400 hp, The N/A block will be fine, but like any turbo'd motor, make sure the tune is good. Besides, open deck blocks run cooler than closed deck blocks.


~Josh~
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