2.5 swap - Page 2 - Subaru WRX Forum
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post #16 of 45 Old 09-27-2007, 08:25 PM
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I went with a Deabolt Superzilla 49 and this thing screams. As for tuning I am running the Cobb AP I had on my first engine, you just need to have a custom map for it

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post #17 of 45 Old 09-27-2007, 09:44 PM
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Quote:
Originally Posted by 05WRXRally View Post
So all i need are th 2.5 block w/ internals and the stock heads, will i need a new PCM or can i use the STi cobb ap? And what turbo should i look into for getting around 350 whp? As for the tranny, should i just go with a set of new gears? Thanks for all the input, ive definatly trashed the H6 idea. just thought i could get some seriouse HP but not withought selling my soul... why do the STi blocks love that WRX heads, why didnt they just put them on the STi to begin with? I would imagine they give good backpressure for more torque but that might just be with V8's ### thats what im use to workin on
Jave is correct on the AP, if you have one now your set, just get retuned for the extra CCs and fuel..

As for the WRX heads on the STI Block, not sure why it works, but it does a lot.. There are a TON of guys running this setup well.. As for the STI heads, they are AVS.. There is an oil line that feeds into the heads and the oil pressure actually can adjust the valve timing at lower RPMs to aid in turbo spooling which makes them spool faster.. That is why they don't come with WRX heads..

As for the Transmission I would suggest a PPG Gearset for your stock housing.. AndrewTech Automotive has the maket and is a great company.. I broke a shift rail (Don't ask me how) and he fixed it for FREE... You can get a 1-4 setup for around 5gs..

Definitly dump the H6 idea, I did as well.. Too much work and money for the outcome..

As for the turbo.. There are SOOO many to chose from, Any thing that is Dual Ball Bearing like the GT30R...

All you need..
STI Short block (comes with block, Crank, Rods, + Pistons..)
New Gasket Set
Pinks (Minimum)
New Tune..

Really that's it.. It can be done for les then $2,500...

02 WRX.. "It's fun when it runs.. Problem is that it hardly ever does..."
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post #18 of 45 Old 09-28-2007, 03:56 AM
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Been readin this thread, its very interesting to see this set up, and they great outcome after such a build. What about a 07 WRX that already has he 2.5 engine, can it swap in 2.0 heads and be ok?
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post #19 of 45 Old 09-28-2007, 06:30 PM
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There is no need for that.. It's not worth the cost and effort.

02 WRX.. "It's fun when it runs.. Problem is that it hardly ever does..."
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post #20 of 45 Old 09-28-2007, 11:43 PM Thread Starter
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Thanks alot for the input guys, its helped alot. I cant believe it can be less than 2500 (for engine) thats alot cheaper than i expected it to be, but then again 5 grand for the PPG gearset and then another grand for a FMIC.

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post #21 of 45 Old 09-29-2007, 09:30 AM
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Well you still don't "NEED" a FMIC (depending on Turbo that is).. And yes the block is cheap really.. I purchased mine for 1600.. I paid 100 for Cometec (spelling?) Head gaskets, 180 (I Think) for ARP Head Studs, and 100 for an OEM Gasket Set.. You don't need the studs but they are stronger and are more accurate to TQ down.. You don't need the Cometec Head gasket (OEM Gasket set comes with OEM gaskets) but it's the best in my opinion..

02 WRX.. "It's fun when it runs.. Problem is that it hardly ever does..."
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post #22 of 45 Old 09-29-2007, 09:37 AM
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Quote:
Originally Posted by LiL Shoaf View Post
And it awaits you if you do the swap.. The 2.5L block LOVES wrx heads and they work very well together.. It's a great setup..
Agreed.....just ensure you upgrade your valve train and a port-n-polish on those heads wouldn't hurt

"Life's a bowl of punch so go ahead and Spike it!" -311
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post #23 of 45 Old 09-29-2007, 09:40 AM
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Quote:
Originally Posted by turmic View Post
nick, I never heard of a S256 Turbo. You quoted it as a 600hp turbo. are you pushing that much? Hope that your PPG'd your tranny. Sorry, if i jacked the thread.

I do have a Dog Box tranny.....so it'll hold....we haven't finished our build yet...took us a while to decide what to do about the heads...and what we wanted to do...we are still shooting for ~600whp...but time will tell

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post #24 of 45 Old 09-29-2007, 10:01 PM Thread Starter
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Quote:
Originally Posted by LiL Shoaf View Post
Well you still don't "NEED" a FMIC (depending on Turbo that is).. And yes the block is cheap really.. I purchased mine for 1600.. I paid 100 for Cometec (spelling?) Head gaskets, 180 (I Think) for ARP Head Studs, and 100 for an OEM Gasket Set.. You don't need the studs but they are stronger and are more accurate to TQ down.. You don't need the Cometec Head gasket (OEM Gasket set comes with OEM gaskets) but it's the best in my opinion..
Ya you only need studs when you combustion chamber is under serious PSI, but its always a good idea in case you put some serious boost

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post #25 of 45 Old 09-29-2007, 11:47 PM
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Well with the studs is not really a "NEED" issue more so a TQ issue.. The head of the bolts actually creates resistance against the head and throws off TQ specs a little.. With a stud you get more comsistant TQ readings for a better result..

02 WRX.. "It's fun when it runs.. Problem is that it hardly ever does..."
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post #26 of 45 Old 09-30-2007, 01:58 PM Thread Starter
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When we build our race engines (chevy SB's) we use head studs because if there is too much psi in the chamber against the valve it will litterally blow the head right off the deck. I would imagine it could do the same to our engines if the conditions were right b/c i read somewhere that with 8:1 compression with 13 psi is the same as a NA engine with 15:1 compression

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post #27 of 45 Old 09-30-2007, 02:32 PM
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That is true, boost does add compression but the increase in pressure would varry on flow more so then boost level, however boost and flow are "linked" together.. Most guys are not pushing enough flow to necessitate studs.. I think it's safe to say that most of the guys that run studs (on here) are more for TQ specs then hold down..

02 WRX.. "It's fun when it runs.. Problem is that it hardly ever does..."
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post #28 of 45 Old 09-30-2007, 05:28 PM Thread Starter
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ya thats true, i would rather take that extra step then blow a gasket

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post #29 of 45 Old 09-30-2007, 05:53 PM
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anyone know where i can d/l or get a map offline for the hybrid?

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post #30 of 45 Old 09-30-2007, 07:47 PM
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Quote:
Originally Posted by 05WRXRally View Post
ya thats true, i would rather take that extra step then blow a gasket
Yea, I hear that.. It's definitly worth the cost of studs in my opinion.. However going with the over size studs option is north if tor most people..



Quote:
Originally Posted by W0R2X View Post
anyone know where i can d/l or get a map offline for the hybrid?
For what ECM?

02 WRX.. "It's fun when it runs.. Problem is that it hardly ever does..."
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