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Oct 22, 2003 | 03:55 PM

joselito

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Heads

I would like to know if I can use japan spec variable valve timing heads on usa engine block for wrx,im planing to try.

Oct 22, 2003 | 04:07 PM

Imprezer

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From: Alameda, CA, USA

Car Info: 02 Black Legacy GT

Yes you can.

They will work.

You can run them WITH or WITHOUT hooking up the AVCS.

If you choose not to hook it up, your car will loose bottom end but gain gobs of top end.

If you choose to hook it up, you will need a JDM ECU and add some wires (Left and right AVCS cam sensors, L/R AVCS selenoids).

---

There are few diff AVCS heads available in Japan.

1. STi AVCS
2. STi Spec C AVCS
3. Non-STi AVCS

All of the above are far better heads than the US ones. AVCS/cams and valves aside. The casting is slightly different. The ports are a lot larger and designed better for improved flow. Also, both utilize "shim under bucket" for improved valvetrain performance. If you plan to high rev your EJ20, thats a must.

Then, there is a diff between the STi and Non-STi heads. The valve material. STi has hollow intake valves and sodium filled exhast valves which the non-STi does not. Also, the exhaust valves on STi heads are ~ .5mm larger.

Then all 3 have different cams. The most agressive are the Spec C cams. They are "spicy" but provide great idle even with AVCS disabled.

---

For myself, I got non-STi AVCS heads. Stuffed it with Spec C cams and buckets and custom dual rate springs and Ti retainers. Overall, the best bang for the buck if you want a crazy head.

My car revs to 9500 like a champ. Sounds like an airplane when it hits 8300RPM.

Oct 22, 2003 | 10:14 PM

Mosh

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Quote:

My car revs to 9500 like a champ

.....................Me WANT...................

That's just sick man...............I don't suppose you would list your mods would you??I'd really appreciate it!!

Quote:

Sounds like an airplane when it hits 8300RPM

........................Eat your heart out honda.................

Oct 23, 2003 | 12:44 PM

jimr

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Joined: Feb 2003

Posts: 568

From: busy writing log of best roads in CA.

Car Info: 2002 WRX Sedan

Imprezer, thanks for posting all the info, I have been looking for the same specs. Your motor sounds absolutely wicked. Do you happen to have the valve timing for the Spec C cams? Thanks again for the awesome info.

Oct 24, 2003 | 12:13 AM

vteg

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Quote:

Originally posted by Mosh

........................Eat your heart out honda................. [/B]

I won't take offense on that one

I am interested in these heads also. What is the cost? Is the stock head the only thing preventing higher redline. Will the pistons fly off the rods or anything catastrophic like that? The first time I drove a wrx, the only thing I could think was this would be even better with 1k extra rev range, and that the 1-2 shift sucks.

Hmm, 9k rpm, awd and boost.

BTW, while on the subject, has anyone modified the stock valvetrain for higher rev limit. I have only had my wrx 2 weeks as of today, so I am still learning what makes it tick.

Oct 27, 2003 | 07:22 PM

HTM WRX

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I'd like more info on these heads....is there a clip available, or someone sell just the heads...rallispec maybe?

Oct 28, 2003 | 05:09 PM

Mosh

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..........Imprezer is there maybe a place to go to read more info about this??Or maybe were to buy??

Quote:

I won't take offense on that one

hehe Thx!! I wouldn't want anybody to get uhhh upset!!heh

Oct 29, 2003 | 05:13 PM

Slamsitin

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Posts: 369

From: Litchfield, NH

Car Info: 03 yellow WRX stage 1

Who says that a higher rev limit is goin to make u go faster? Powerpeaks then starts to drop off.

Oct 29, 2003 | 08:36 PM

Mosh

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Who says that a higher rev limit is goin to make u go faster? Powerpeaks then starts to drop off.

I'm sure that with the right tuning and the right parts having more revs will give Huge gains to top end.........You need the right turbo for instance.....When you have 9500rpm at redline, not getting boost till like 4000rpm may not be such a bad thing anymore since you still have a long way to redline.........I think higher rpm ranges could help an Extremely moded rex use all that a really big turbo has to offer.........Now the standard five spd surviving that is another story.......heh.......

Oct 29, 2003 | 09:56 PM

#10

Max Xevious

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From: Wagonmafia Propaganda Lieutenant

Car Info: 2014 Forester XT

QUICK ALEX.. MAKE A WAV I WANNA HEAR IT !!!

Oct 31, 2003 | 09:38 PM

#11

Mosh

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..........I Wonder what Turbo would you use if you had a 9500 rpm redline????Maybe like a SR40 or T67?????

Oct 31, 2003 | 10:34 PM

#12

Imprezer

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From: Alameda, CA, USA

Car Info: 02 Black Legacy GT

T67 :banana:

Nov 1, 2003 | 05:37 PM

#13

push2

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Posts: 1,475

From: 02 GGA that needs to sleep soon

Car Info: 02 GGA

not to jack the thread but whats the diff between a type c and the s202 motors, ie heads mostly? thanks

Nov 1, 2003 | 10:24 PM

#14

Mosh

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..........That must be cool.........I think a T67 normally is boosting by like 4800 rpm right???I bet all Hell breaks loose When that thing gets goin and you get to enjoy it for another 4200rpm.......Schweet......