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Old 06-13-2008, 09:50 AM   #1
16gsuby
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Impreza WRX how to make power?

i want to make 400whp on a ej205? What are the supporting internal mods I need? I know i need pistons, but will the rods hold?
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Old 06-13-2008, 10:48 AM   #2
03WRX-WRB
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uhhh....

1 forged pistons
2 new rods
3 new crank
4 valve train is fine but is a bit restrictive so an upgraded valve train would be good.
5 turbo back exhaust,
6 FP green turbo or larger
7 injectors 800cc or larger
8 upgraded tranny to support the power, and clutch
9 exhaust manifold and up-pipe
10 intake, CAI

thats just some of the things you need to do theres more trust me
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Old 06-13-2008, 11:31 AM   #3
16gsuby
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I'm talking about internals only, I know the bolt ons, but will I have to upgrade the rods or are they reliable for 400whp,I'm planning to pnp heads and get stage 2 valvetrain to help with air.
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Old 06-13-2008, 01:05 PM   #4
silverongold
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crank could handle it right?
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Old 06-13-2008, 01:31 PM   #5
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The crank can handle it as well as the rods as long as tuning and fueling is great. If you have access to a very reputable tuner then you could probably get away with just a piston swap.

I wouldn't take any chances. A set of CAT Rods can be had for $300 on ebay.
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Old 06-13-2008, 04:06 PM   #6
Dantes Inferno
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ej22t will run 400whp on all stock internals, maybe its a cheaper route.

- well ported 2.5 SOHC heads, delta 220 cams
- sti yellow side feed injectors / fuel rail
- wrx 2.5 intake manifold
- maybe something like a vf43
- a good engine management system
- tune it well
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Old 06-13-2008, 05:26 PM   #7
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Quote:
Originally Posted by 03WRX-WRB View Post
uhhh....

1 forged pistons
2 new rods
3 new crank
4 valve train is fine but is a bit restrictive so an upgraded valve train would be good.
5 turbo back exhaust,
6 FP green turbo or larger
7 injectors 800cc or larger
8 upgraded tranny to support the power, and clutch
9 exhaust manifold and up-pipe
10 intake, CAI

thats just some of the things you need to do theres more trust me
are you serious?

Aside from supporting mods (exhust, fmic, fuel, turbo and tune)...pistons, rods (for insurance as EJ205 CAN but are at limit), I always suggest a cam and at least springs while people are in there. Simply because of the top end gains that can be picked up. Port work is time consuming = $$$

Last edited by Homemade WRX; 06-13-2008 at 05:33 PM.
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Old 06-13-2008, 05:31 PM   #8
jbwrx
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Quote:
Originally Posted by Dantes Inferno View Post
ej22t will run 400whp on all stock internals, maybe its a cheaper route.

- well ported 2.5 SOHC heads, delta 220 cams
- sti yellow side feed injectors / fuel rail
- wrx 2.5 intake manifold
- maybe something like a vf43
- a good engine management system
- tune it well
There is no way a VF43 is going to get you 400 whp on its own. Even if you add meth you won't get there.
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Old 06-13-2008, 06:29 PM   #9
16gsuby
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so i'm guessing the rods could take it, but it would be insurance for my motor. i don want so much lag so i'm guessing a pnp 20g
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Old 06-14-2008, 12:11 AM   #10
03WRX-WRB
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Quote:
Originally Posted by Homemade WRX View Post
are you serious?

Aside from supporting mods (exhust, fmic, fuel, turbo and tune)...pistons, rods (for insurance as EJ205 CAN but are at limit), I always suggest a cam and at least springs while people are in there. Simply because of the top end gains that can be picked up. Port work is time consuming = $$$
i was just simply stating that a crank can be a good idea, it does NOT by any means have to be changed if you want a car that can handle well past 400whp the crank would be a good idea

the rods can hold 400whp in the 2.0 the pistons/rings are the weak point. the crank bearing can be a weak point to if you lack oil.

i just tour down my motor and my cyl 4 was toast top ring melted closed, 2nd ring broke in 10 pieces and the piston broke 2nd and 3rd ringlands

but really you need a good reliable tune
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