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Old 07-20-2003, 12:28 PM   #1
WRX 555 STi
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Member#: 8042
Join Date: Jul 2001
Location: Elmwood Park, IL
Vehicle:
MY00 WRS - '04 WRX
2002 Dragon slayer :)

Default My RS buildup questions...

As many of you know, I have an engine to be built in a short while (couple months or so). I have figured everything out for the block, now I need to figure out valvetrain. Should I go with:
a. SOHC RS heads with upgraded valvetrain, or
b. DOHC WRX heads (possible COBB cams upgrade).

I am looking to run:
18 PSI max
Looking for 350hp (300awhp to the wheels)
Looking for 12.2 - 12.5 1/4 mile times
Trans will be upgraded to an RA gearset eventaully

What you guys think? I need some opinions here. The car will not be driven daily, only weekend/fun car. Might take it to the strip once or twice to see gains/1/4 times.

Experts, lets get some comment there!

Thanks!

~Anthony.
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Old 07-20-2003, 05:41 PM   #2
WRX 555 STi
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Location: Elmwood Park, IL
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MY00 WRS - '04 WRX
2002 Dragon slayer :)

Default

ttt
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Old 07-20-2003, 11:32 PM   #3
Trizzle
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Chapter/Region: NWIC
Location: Bend, OR
Vehicle:
1984 VW Westfalia
with EJ25 Power

Default

Being designed for a larger displacement engine, the EJ25 heads may flow a little better... on the other hand, even though the WRX heads are designed for a smaller displacement, they are meant for turbo application also, so maybe they would flow better?

Lol, i'm no help i guess

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Old 07-21-2003, 08:10 AM   #4
WRX 555 STi
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Location: Elmwood Park, IL
Vehicle:
MY00 WRS - '04 WRX
2002 Dragon slayer :)

Default

ttt
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Old 07-21-2003, 11:34 AM   #5
DoctorNick
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heh, chulooz
is on my ignore list

Default Re: My RS buildup questions...

Quote:
Originally posted by WRX 555 STi

Should I go with:
a. SOHC RS heads with upgraded valvetrain, or
b. DOHC WRX heads (possible COBB cams upgrade).

I am looking to run:
18 PSI max
Looking for 350hp (300awhp to the wheels)
Looking for 12.2 - 12.5 1/4 mile times
Trans will be upgraded to an RA gearset eventaully
#1. to what I know, no one else has done wrx heads. Thats a path of the unknown.
#2. 18psi on that turbo is more then lkely going to not give you more power but just push hot air. I'd suggest a diffrent turbo if your looking to push 18psi.
#3 to make 300awhp you will need to make 350. To make 350 you will need a built block, a bigger turbo, heads to take float and I would assume bigger injectors then 440cc.
#5 12.2-12.4 is where dan is, do you see how much money dan has dumped into his wrx to get it there? His car is far from stock and a simple built motor with the turbo that comes in the kit won't do it. Besides your gonna need a new gear box and you should also get brakes while your at it because I kinda believe in an all around car. I also don't think the turbo is gonna make it for you to get those kinda times. Did you notice how brian ran a 13.7 at the track with a cam'd turbo rs? if your looking for a 12.2-.4 consistiant....you either better become the best driver out there or you are gonna need a 11 sec car...which is VERY hard to come by in our little AFI world.

just my 2
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Old 07-21-2003, 01:40 PM   #6
QfactorRS
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Location: RMV timeouts, Boston
Default

that is funny...

my uncle always said to aim high.....he used to and it cost him his life...

anyway, you are aiming really high.

you should look into axxis power's monster motor buildups to get this kinda of power.

for something semi-reliable, you are gonna need low comp ratio, valve springs, probably need to oring the black and some serious injectors and fuel rails/lines. COBB stage 1 cams should do it.

clutch/tranny/rear diff.

When i first bought my car i thought it would be great to aim at 200whp, and i thought that was aiming high.

Q
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