RJ's STi - Page 71 - Perth-WRX.com

RJ999 · #**701** 25-04-2015, 06:00 PM

Quote:

Originally Posted by Tony

Hard to say with no prior experience driving or being a passenger in a car with a 8cm and then a 10cm to compare. Steves could he 10cm.

Speaking for yourself there Tony? ... I've been in cars that have had a 1.5xtr on 8cm and 2.5xtr on 10cm... know exactly what I'm saying.
Fyi Steve's is a 2.5xtr on 8cm... but its not just the turbo that makes his car fast

RJ999 · #**702** 25-04-2015, 06:09 PM

Quote:

Originally Posted by ALLPAWS

Back to my original thoughts, has anyone played with valve jobs, springs or porting when doing the heads? Or is the stock heads pretty good to start with?

Lol you have to have very very deep pockets for headwork... that is what usually blows the budget in the build...look at around 5-6k for this with cams etc

dazdavies · #**703** 25-04-2015, 06:11 PM

Standard 06 WRX single heads and cams will flow circa 600bhp(flywheel) before they start to choke. I dare say the dual AVCS heads will be the same

dazdavies · #**704** 25-04-2015, 08:02 PM

Quote:

Originally Posted by RJ999

Lol you have to have very very deep pockets for headwork... that is what usually blows the budget in the build...look at around 5-6k for this with cams etc

It's half that as I've just priced it up for mine.
Cosworth Cams $1200
Supertech valves, double springs and titanium retainers you'll get change from $1000, just.
I wouldn't bother with porting unless you're wanting every last bit of power. It's not so crucial on forced induction. It does improve things slightly but not enough to notice in a road car.

As mentioned in my previous post I ran standard 2006 single AVCS WRX (not STI) heads in my 2 door GC8. The heads were standard as were the cams. I just changed the valves and springs. That made 600bhp before it started to choke. It was plenty quick enough.

dazdavies · #**705** 25-04-2015, 08:03 PM

Also don't bother with oversize valves they make fuck all difference.

RJ999 · #**706** 25-04-2015, 08:29 PM

Nice...but labour cost not factor for you. Add another 2k on top for workshop labour fees

dazdavies · #**707** 25-04-2015, 08:52 PM

Yeah porting and polishing is time consuming that's for sure. I didn't even think about labour.

I also didn't factor in the cost of correct size valve lifters too. So you're not far off I guess.

Just goes to show the cost savings to be had by doing things yourself.

Jacob92 · #**708** 25-04-2015, 08:57 PM

Amen to that

using the Perth-WRX mobile app

RJ999 · #**709** 25-04-2015, 08:59 PM

Quote:

Originally Posted by dazdavies

Yeah porting and polishing is time consuming that's for sure. I didn't even think about labour.

I also didn't factor in the cost of correct size valve lifters too. So you're not far off I guess.

Just goes to show the cost savings to be had by doing things yourself.

I wish I had a mate like you who had the free time to do another engine build while halfway through his own

dazdavies · #**710** 25-04-2015, 09:02 PM

There's only one way I'm going to build engines for people.
They have the machining work I specify done and they use the parts I recommend. If they wont do that then some fucker else can build it

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