they make two styles of the 3076r. one with a EWG mounted on the turbo and one with an IWG (stock location) then you would have to weld or bracket it shut to use a EWG in the upipe <-----this is what I am going to do.

 

Your missing a lot of important things here. First you have to remember that he has a 02 WRX ECU. New EJ255/7 heads are close to older EJ20 heads but they have other systems involved too such as AVCS, its pump system, and I believe the air pump as well. Its not as simple as just plucking STI heads off and swapping them on. With our 16 bit ECUs most times its easier to use old v5-6 non AVCS heads to get better flow. In addition companies like EQ Tuning offer services to replicate the combustion chamber of the EJ20 heads to match the EJ257 STI heads. Many hybrids are built because it can be a cheaper alternative to an entire motor swap. Also the EJ257 short block offers stronger rods and a better crank already assembled with STI bearings by the factory. This makes it a very appealing swap because with simple forged pistons you have a strong short block on a budget. If you are to swap to a EJ255/7 motor you now have to incorporate the newer 32bit ECU, and its corresponding components such as the drive by wire pedal box and throttle. I guess what I am trying to say is hybrids have their place in Subaru Tuning and can be cost/power effective when done right.

 

dude for the power you want you dont need ported heads.. just do some cams sti ones if you are on a real budget or some kelfords if you gots the $$ for springs and valves turn in concepts posted up they are making 385whp with sti cams in a stock wrx head with a 3071

 

The timing issue has already been taken care of on lorenzos heads, it doesnt take hundreds of dollars and CNC machine work, just a functioning brain, few minutes, and a dremel tool.

The reason the lorenzo isnt seing sti power, is because of stock wrx cams, and the lack of variable valve timing. It has nothing to do with the actual flow of the head's cast or shape of the head's combustion chamber.

It would take some extreme angle cams that idle like **** to create the same power as a solenoid actuated 10 degree advance and retard. And the rough bottom end exhaust flow would be turbulant and be poor spooling.

You cant just put sti heads on a pre 06 wrx that easily. The heads themselves can be purchased for between 5 and 7 hundred on ebay commonly.

but then you need the cam gears, AVCS solenoids, AVCS oil lines, block off plates for the emessions crap, and then there is the AVCS control issue.

good luck finding 04 sti ECU (cabler throttle)and wiring harness, so you have to do a drive by wire conversion that includes immobilizer and taking doors apart and all sorts of mess.

the other option is to use the tgv wires for the AVCS solenoids, and buying a stand alone ecu.

there are a few other ways around this...but is it worth all the trouble for a few more horses?



sti cams will make a huge difference in power above 5,000 rpm, but vwery minimal peak hp gain. you can go with aftermarket cams to gain higher hp numbers, but the spool and bottom end power will suffer. Variable valve timing is great.

Just not great enough to justify the additional time and thousands of dollars in my oppinion

 

the wrx heads flow just as good as factory sti heads the AVCS is what helps

 

^^^amen

 

Pm'd you

 

Did you guys measure the combustion chamber volume after this process?

 

True... unless you are having a shop do the work for you ...which is most of us. Not everyone has the know-how to rip apart heads and dremel them. Functioning brain or not.

 

I'd have to co-sign on that.....there are to many shops out there that have perfected porting. knowing whats to much or to little with flow tests to prove it. I would rather send my heads to someone that has done it and know what they are doing.

 

its not porting its making the making the combustion chamber bigger

 

And that still is a measured process. Removing material from the combustion chamber changes your compression ratio. If not done with meticulous care, you could end up with different compression in in each cylinder. It's not a hard process per say as it can be done with water and a graduated cylinder measured in CCs but its important. Also proper finish of the chamber is important as any edges or burring can cause hot spots which lead to knock instances.

 

Everything was done correctly....

Dane you did you find those cams yet?

 

get me a hookup price and i'll do my CNC with EQ.

 

i dont want to be a b1tch...but i have yet to see any of the cars you built make good power....sorry.