Anyone that has decent experience doing an ej engine swap and build up, that can help out, please send me an email.

snuffy@hawaii.rr.com

 

ds_baruuu did it

 

^^ it's "ds_baruuuuu"

 

^^^ and blazerwrx

 

me too, but I'm in NY and won't be of much help.

 

i was thinking of making a ej257 with a v8 head and no idea on turbo. if anyone has any input or toughts please feel free to let me know.

 

Why do you feel that youhave to swap your heads? Why not just PnP the heads, get better valvetrain, and cams. Short block wise take your pic or just slap some pistons in what you have now. You be suprised at how strong our stock rods and cranks are. Unless you plan on making more than 5-600 WHP

 

if you can get your hands on the proper flanged up and downpipes, the GT3071R is a *****in' turbo!!!
I'm getting one for my setup next month! I can't wait.

http://www.optionimports.com/garrettgt3071r.html

http://www.turbobygarrett.com/turbob...oByGarrettCTR#

it's a faster spooling version of the GT30R.... so pretty...

 

Which V8 heads do you plan to go with? JDM or USDM? It won't be 2.5l if you go JDM. The JDM heads combustion area is not matched to the 2.5l.

I agree with Mario. Stick with the USDM STi heads and port the runners. You'll maintain the 2.5l and you'd be suprised with how much power you can get with the USDM STi cams plus avcs.

 

I'm confused... since when did heads affect displacement? Subaru doesn't count the combustion chambers in their volume measurement do they??

I know you'll change your compression ratio drastically with a different head. But a 2.5L block is a 2.5L block.

 

The 2.0 WRX heads plus the 2.5l Sti block makes a 2.35l displacement.

The combustion area on the USDM STi head is deeper than the area of the WRX heads.

I was going to machine my wrx heads to match the 2.5l block so the displacement will be a true 2.5.

 

never ever heard of that.
I know that a 2.2 block with a 2.5 crank gives you 2.35L of displacement.... But displacement is pi times the radius squared (bore/2) X stroke x number of cylinders....

Example: bore of an EJ22T is 9.69cm Stroke is 7.5cm
so: (9.69/2)^2 * pi * 7.5 * 4cyl = 2212cc's

Or using Subaru's published numbers for a USDM STi:
(99.5/2)^2 * pi * 79mm * 4cyl = 2457cc

Exactly what subaru put out, nothing about cylinder heads in the calculation.





for compression ratios check this out:
http://wac.addr.com/auto/obs/turbo/ejcalcs.html

 

Dom i know if i use a 2.5 crank w/ 2.2 block i get 2.35l. what would i have since i'm boring my block out from 3.815 to 3.825?? i know it wouldn't be much but what would it be?? Thanks

Mario

 

Okay, I just asked Ed and he gave me the, "huh, wtf you talk'n bout," look.

Doms, you're correct with the info on measuring displacement with the block. Ed also explained to me that you can't lose displacement.

So now I'm confused with the actual combustion chamber of the heads playing a role in engine displacement. Factory specs have the WRX heads at 52cc of displacement and the USDM STi heads at 58cc displacement.

So does this mean that regardless of the different displacement of each heads, it won't influence overall displacement of the motor? I know it'll change compression, but is that all it affects? I was too ashamed to ask Ed after asking him a stupid question earlier.

 

ryan, i have a dremel w/flex head if you ever plan on p&p