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Old 07-13-2005, 05:11 PM   #1
13secwrx
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465Whp SZ'D..when running

Default Most Hp on stock wrx heads

I have stockers right now and I wanna know what the limits of the heads will be ?...I currently have an ej257 w/supporting mods and an sz49. I am prolly looking at a 35r w/the .082 a/r ...

Whats the max hp that you have seen on the stock cams and heads...


Thanks
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Old 07-13-2005, 06:06 PM   #2
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Ive seen a wrx with 2.5 block and wrx heads (t3/t4 garrett) make 390 whp pump gas 18.5 psi...dont know about race fuel, but im sure with the 35R you can make the 400 mark on pump.



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Old 07-13-2005, 06:08 PM   #3
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how about a 2.35 with stock heads plus gt35
that put 395 whp on our DynaPack..
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Old 07-13-2005, 08:26 PM   #4
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Little bigger turbo and some nitrous can do wonders.
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Old 07-13-2005, 08:28 PM   #5
sonicowrx03
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John woods from www.xmotorsports.com made 401whp using the 2.5l block and 2.0 liter heads(that was over 2 yeras ago) I am sure is is at least 450whp now with other additional mods he had done.
check out his website(it is a silver WRX on the home page).

my .2c
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Old 07-13-2005, 08:39 PM   #6
13secwrx
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I made 387whp on pump and 465 on 100 octane...so Ive been their ...I just want to know if I can make 450whp on pump w/the 35r and some great tuning...
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Old 07-14-2005, 09:01 AM   #7
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Quote:
Originally Posted by 13secwrx
I made 387whp on pump and 465 on 100 octane...so Ive been their ...I just want to know if I can make 450whp on pump w/the 35r and some great tuning...
Yes thats possible.....,but I havnt seen it done with WRX heads....you would need JDM heads or USDM STi heads at the least.



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Old 07-14-2005, 11:03 AM   #8
ILwrx
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wow. I didn't thought that heads limit can take away so many hp.
Right now i have stock wrx heads with cams and will be installing jdm v8 heads with 272 juns. What HP gain could I expect? (2.5 block)
Thank you.
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Old 07-14-2005, 11:13 AM   #9
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Whats the difference between the WRX heads and USDM STi heads?.

As far as I know they are both small port. I think the WRX heads are even AVCS provisioned. I always thought that the STi cams had everything to do with it not so much the heads.

My theory is that if you have the engine apart replacing the block with a built lower end why wouldn't you just send your WRX heads out for a nice P&P. I mean hell then you could upgrade to the Jun cams or Crowers.


Just a thought.
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Old 07-14-2005, 11:21 AM   #10
jared nelson
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Quote:
Originally Posted by kwilson36
Whats the difference between the WRX heads and USDM STi heads?.

As far as I know they are both small port. I think the WRX heads are even AVCS provisioned. I always thought that the STi cams had everything to do with it not so much the heads.

My theory is that if you have the engine apart replacing the block with a built lower end why wouldn't you just send your WRX heads out for a nice P&P. I mean hell then you could upgrade to the Jun cams or Crowers.


Just a thought.
upgrading cams is a HUGE undertaking, because that means you have to also do springs, which means you need new retainers, and all this also means you need to replace the shims, and build an underbucket or shimless design. its not just a matter of slapping in new cams like on an EVO. i HIIIIGHHLY recommend ditching the WRX heads and puting some 207 heads on. I think a 257/207 shortblock/head combo would be potent.
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Old 07-14-2005, 12:17 PM   #11
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Quote:
Originally Posted by jared nelson
upgrading cams is a HUGE undertaking, because that means you have to also do springs, which means you need new retainers, and all this also means you need to replace the shims, and build an underbucket or shimless design. its not just a matter of slapping in new cams like on an EVO. i HIIIIGHHLY recommend ditching the WRX heads and puting some 207 heads on. I think a 257/207 shortblock/head combo would be potent.

Are the 207 heads big port?...what are the main advatages as it relates to cams?. Is there any situation that you can bump up to a more aggresive cam and not have to upgrade springs, retainers, shims?. I always assumed that you could use the stock componants or at least be able drop the STi cam in without replacing everything.


I always subscribed to the theory that the heads where the real limiting factor on the USDM 2.0 and 2.5's making reliable big HP. Just not able to move enough air.


Curious?.
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Old 07-14-2005, 01:50 PM   #12
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Quote:
Originally Posted by kwilson36
Are the 207 heads big port?...what are the main advatages as it relates to cams?. Is there any situation that you can bump up to a more aggresive cam and not have to upgrade springs, retainers, shims?. I always assumed that you could use the stock componants or at least be able drop the STi cam in without replacing everything.


I always subscribed to the theory that the heads where the real limiting factor on the USDM 2.0 and 2.5's making reliable big HP. Just not able to move enough air.


Curious?.
yes i think they are, i do know that in stock form, BONE STOCK form, they way out flow the WRX heads, and even better than MOST head mechanics will be able to flow them with just PnP jobs. Als, you can spin them up to 8000 rpms, or more, and also use AVCS. the WRX heads NEED the following upgrades to spin to 8000. underbucket shims, new retainers, new springs, and to make use of the engine speed, youll want cams. thats much more than just buying a 207 head and using that.

believe me, i went the hard route 2 years ago, and it blows dick! i have heads that flow well, for having stock cams still, and it cost me 2500 bucks or more. i did titanium retainers and dual valve springs, ported moderately with good flow, stock cams, and stock shims. I spin my motor to about 7700 RPMs because Ron at axxis power racing only recommended it take it to 7600. if i would have just bought the Gdamn 207 heads, i could be spinning my **** to 8500 rpms all day long, outflowing these, getting better spool with the AVCS, and making more power with a MORE efficient head. and it would have cost me less!
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Old 07-14-2005, 01:55 PM   #13
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Crower valve springs and titanium retainers are $300 from Summit. then the cams are not that bad either. How on earth did you spend $2500?? Port job is not $1700.
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Old 07-15-2005, 11:19 PM   #14
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Quote:
Originally Posted by jared nelson
I spin my motor to about 7700 RPMs because Ron at axxis power racing only recommended it take it to 7600.
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Old 07-14-2005, 11:19 AM   #15
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stealth wrx aka nick deblasi from section8 motor werks made 536 wheel horsepower with a 2.5ish liter, stock WRX heads (ithink with some porting, but stock cams for sure) and a bunch of other things, custom Water to Air IC, af garrett t04r turbo at 33 psi boost. It takes a whole LOT to extract power from a motor when the heads are that ****ty. i mean 33 psi boost to make 536 wheelhorsepower. thats not good, thats a sign of a very inefficient motor.
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Old 07-14-2005, 11:56 AM   #16
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+1....heads on our cars is a big PITA. i used to have a set of v 8 heads here and let them go, and ive been kicking myself ever sense. and by the time you put quality parts, port and polish wrx/sti heads your into some BIG money!
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Old 07-14-2005, 12:31 PM   #17
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Wrong forum.
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Old 07-14-2005, 02:07 PM   #18
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Old 07-14-2005, 02:28 PM   #19
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cuz i got one of these... Axis Racing Stage 2 Valvetrain Kit:
- Dual Spring Valvesprings
- Titanium Retainers
- New Buckets
- New Shims (Shim Under Bucket Design)
- New Keepers
COST: $1,399.99

If Heads are sent to us Included is:
-New Valve Seals, Valve Lapping Procedure
- Free Assembly
- Customer pays Shipping

but kept the overbuckets in because of budget, and one of these...

Street/Race Flow Numbers
- Intake: 260CFM
- Exhaust: 225CFM
- (+/- 5%)
Stock WRX Flow Numbers
- Intake: 201CFM
- Exhaust: 159CFM

Axis Racing Street/Race Porting:
- Multi Angle Valve Job
- Valves are evened to .005 of each other
- Usually a 2 week turn around


TOTAL COST: $ 1,249.99

and note the flow numbers, i dont think they are that better than the stock 207 heads. mine were not done that well either, because mine were done 2 years ago.
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Old 07-14-2005, 02:36 PM   #20
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THEN CAMS! its a no brainer, ditch those, and do 207s
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Old 07-14-2005, 04:24 PM   #21
kwilson36
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Wont you have the same expense with the 207 heads?. I mean you still have to upgrade the valvetrain right?. I mean why would you drop WRX cams in a 207. I would want a much stronger profile cam in there to take advantage the extra breathing room.... you know.
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Old 07-14-2005, 04:32 PM   #22
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you can buy the heads with cams and the whole valvetrain im thinking.

well lets do this, in order to get your heads to flow the same as the 107, you need cams, and all that **** above, and a pnp. that will cost you about 3k, im thinking,

you can simply buy a whole version 7 sti 207 swap with ECU, turbo, IC, with everything needed, for $4499 at kingpin performance. its the best thing to do with your WRX engine, throw it in the garbage.
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Old 07-14-2005, 04:32 PM   #23
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oh, and NO you dont have to upgrade the valvetrain, its allready beefy and flows really well, thats what im saying.
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Old 07-14-2005, 04:33 PM   #24
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Wont you have the same expense with the 207 heads?. I mean you still have to upgrade the valvetrain right?. I mean why would you drop WRX cams in a 207. I would want a much stronger profile cam in there to take advantage the extra breathing room.... you know.


you wouldnt put wrx cams in 207 heads! they will already go to 8500 rpm stock and come w/ a much better cam profile.
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Old 07-14-2005, 04:53 PM   #25
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Ok .... so the ideal setup would be to buy the 207 heads complete, meaning with valvetrain intact, and lets say an axis stg3 bottom end or a Crawford S3L.

Bullet proof lower with lots of beathing room.

What, if any, Cam is more aggressive that the 207 stockers?.
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