[08aspenSTI]

So piston #2 went out and I worked a deal with my dealership and they are going to allow me to put in FORGED pistons, due to the fact that it will give me peace of mind on this issue. Of couse I have to pay for the extra labor for the teardown of the other side of the motor, but i figure why not just put the forged ones in while we are in there. So what would you all suggest for a set of forged pistons and who sells them here on IWSTI?

[FlyingPerformance]

CP 99.5mm drop ins. We have had really great luck with these pistons.

[Turninconcepts.com]

We used Mahle 99.5mm pistons in ours and have been happy.

[mikeygar]

how about JE or Eagle? Any good? do you guys upgrade the connecting rods to forged as well while you're at it?

[FlyingPerformance]

Originally Posted by mikeygar

do you guys upgrade the connecting rods to forged as well while you're at it?

Rods are already forged. Their design does not make them as strong as some of the aftermarket ones, that is why people upgrade.

[helldorado]

Originally Posted by FlyingPerformance

Rods are already forged. Their design does not make them as strong as some of the aftermarket ones, that is why people upgrade.

Rough estimate, but what kind of power can the stock rods handle?

[FlyingPerformance]

Originally Posted by helldorado

Rough estimate, but what kind of power can the stock rods handle?

I hate stating dyno numbers, but roughly 450-500 whp maybe more maybe less. The cast pistons will give out before the rods. One of the main reasons people replace the rods though is because aftermarket rods are generally lighter as well as being stronger(different quality of aluminum/formula/etc..). This in conjunction with higher rate valve springs and now you can rev to 8k very easily.

[Cicio]

Sell the crap box and buy one without a hatch!



I am totally kidding (no 08 hating here) aspen is a local buddy so I am just giving him shiz

[helldorado]

Originally Posted by FlyingPerformance

I hate stating dyno numbers, but roughly 450-500 whp maybe more maybe less. The cast pistons will give out before the rods. One of the main reasons people replace the rods though is because aftermarket rods are generally lighter as well as being stronger(different quality of aluminum/formula/etc..). This in conjunction with higher rate valve springs and now you can rev to 8k very easily.

I hear you on the dyno numbers, why I was just looking for a rough estimate, always assume conservatively.

I figured there'd be more work needed than just valve springs and a piston and rod swap to hit 7.5 or even 8k. Good to know. Thanks!

[FlyingPerformance]

Originally Posted by helldorado

I figured there'd be more work needed than just valve springs and a piston and rod swap to hit 7.5 or even 8k. Good to know. Thanks!

Honestly its more the valve springs than anything else. Above 7.5k you start to get valve float on the stock valve springs, you could also potentially break the stock valve springs at this level. Nothing has really physically changed with these motors from the 04-07 motors to keep them from revving to 7k and people routinely revved those to 7.5k in stock form. 8k with valve springs is very do-able. But to have it rev well to 8k I would put pistons, rods, valve springs(obviously), light weight flywheel, and a crank damper like the one from ARFab. Cams would also help at high rpm's as well as a monster turbo. So as you see its a little more complicated, but the parts are there to do it easily.

[08aspenSTI]

Originally Posted by CicioSTi

Sell the crap box and buy one without a hatch!



I am totally kidding (no 08 hating here) aspen is a local buddy so I am just giving him shiz

Your a jerk...Watch out for those curbs btw Cicio, heard they got a way of sneaking up on a brother. JK

[RayToday]

Sorry to hear about the blown piston. That really sucks.

Honestly, If I was in your exact situation I would try and buckup the cash for a stroker kit. No kidding.

Increased displacement and forged parts FTW. Its not much more labour cost to change the entire bottom end. Its all going to be apart anyway. I bet you are more then half way there.

BrianCrower.com - Brian Crower - BC - Subaru WRX STi - EJ257

DO IT!

[FlyingPerformance]

Originally Posted by RayToday

Sorry to hear about the blown piston. That really sucks.

Honestly, If I was in your exact situation I would try and buckup the cash for a stroker kit. No kidding.

Increased displacement and forged parts FTW. Its not much more labour cost to change the entire bottom end. Its all going to be apart anyway. I bet you are more then half way there.

BrianCrower.com - Brian Crower - BC - Subaru WRX STi - EJ257

DO IT!

Unless you are going to sleeve the block, not worth it.

[STUKA]

I would go with the CP pistons! Then your engine will ROCK!
eBay Motors: CP Pistons Set EJ25 Subaru STI (item 140268863231 end time Sep-27-08 11:23:52 PDT)

Home of The worlds fastest Subaru STI.

And now Home of the fastest Mitsubishi EVO X!

[RayToday]

Originally Posted by FlyingPerformance

Unless you are going to sleeve the block, not worth it.

Why? Is the block good for less then 500 hp?