i was just wondering what the 06 wrx engine can handle? i know that the only difference betweent he sti and wrx is heads and pistons. so my question is , do i just need new forged pistons to hold large amounts of power? i'm looking to put a gt30 or t3t4s on it somewhere down the road? i figure my first real big mod would be tranny (ppg straight cut/dog 1-4). and form there i would build around that. then work on building the internals and last the turbo kit.
I'm sure that if you want an engine to make big number reliably you would need to do some engine work. The WRX's 2.5 does have great internals though and it can take a hell of a lot. Not the technical answers you wanted I guess but it's a start.
not really because sti's still would still upgrade similar things too. plus i like the 5 speed ppg's over 6 speed. if the blocks are so similar why would the sti hold so much more. isn't a sti engine good to 500whp?
Here's some more info: It's a semi-closed deck design... The following are exerts from some on-line articles: Like the old engine, it's a turbocharged and intercooled 16-valve dual overhead cam boxer four, but a semi-closed deck design, forged high-carbon steel connecting rods, and other internal modifications make it stronger than the old 2.0-liter block. Variable valve timing widens the power band. Less boost means less power than the STi, but it's not deficient. While the horsepower spec, 230 at 5600 rpm, is virtually identical to the old engine's 227, torque has increased from 217 lb-ft to 235, at a lower 3600 rpm. While top-end power, never deficient, is unchanged, the low end and midrange get a very welcome and useful boost. Turbo lag is nonexistent as long as the revs are kept up, and minimal when they drop too low. - The AutoChannel.com -Drive-by-wire throttle -Aluminum alloy pistons -Cast iron cylinder liners -Reinforced "semi-closed deck" alloy block -Forged high-carbon steel connecting rods - 2007 SUBARU WRX AND STI RESEARCH PAGE
WRX....Description...........Part Number Block set.........................11008930 Cylinder Head L.................11063AB250 Cylinder Head R.................11039AB820 Piston Set........................12006AD210 Piston Ring Set..................12033AB340 Rod Assembly....................12100AA180 Crankshaft........................12200AA330 Exhaust Valve....................13202AA570 Intake Valve......................13201AA371 STi.....Description.............Part Number Block set.........................11008930 Cylinder Head L................11063AB330 Cylinder Head R................11039AB910 Piston Set........................12006AC390 Piston Ring Set..................12033AB340 Rod Assembly....................12100AA180 Crankshaft........................12200AA330 Exhaust Valve....................13202AA570 Intake Valve......................13201AA371 i posted this up on another forum about 06 wrx's. everything is the same except pistons and heads. will the heads make that much of a difference in how much power it can hold?
Well yeah that'll be one of the limiting factors. I know I've heard people talk about how the heads are the only thing keep them from making over 600 hp, but of course that is fairly vague statement at this point. But I think if you get to the point where you need wilder cams or port and polish jobs or whatever then you're going way higher than the engine was ever mean to go.
I can't suggest anything. I'm hoping some of the hardware freaks will chime in sometime soon. I'm pretty much happy with my current setup since the TD04 seems to be good for 250 Hp and 320 lbs. ft. with a bolt on or two and software tuning of course.
i was hoping that i wouldn't have to buy a whole block. jsut wanted some pistons to hold the power. but i guess if thats what i need?
Ya you can definitely buy just pistons, just make sure and go forged. I think with port and polished heads, forged pistons and some intake polishing this engine could be every bit as strong as the STI engine. I mean half of the engine is the same!! Or if you decide to get rid of it in favor of a sti block I will be happy to take yours off your hands!!!