Even in japan the default v5/6 pistons were 'semi' forged...... unless the check box for 'motorsport' forged pistons was ticked at the time of ordering.

Australia was the only market where factory fitment of forged occurred for the STI V6.... Purley for Subaru Aus to 'save face' after several v5 engine failures and durability issues.

Version 5's arrived here with the full 100 octane jap tune...... on hot day they'd ping on our 95 at the time, the ecu couldn't pull enough timing to prevent it......Hence there was a dealer supplied re-flash to drop the base timing values and taper the high rpm boost off faster.


V6 has vf28 or 29 (mine has a 29, same as a 28 with minor inducer design change).

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[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

people confused forged with ceramic coated cast pistons.

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Long live the WRC

Stolen from MSGOFAST on Rexnet....

Ok pics are of a V5/6 STI forged piston on the far left.
Second from the left is a 02-05 2.0lt STI forged piston found in all 02-05 STI AU delivered cars, also in 01-02 JDM 2.0lt STI's
Third from the left is a JDM twin scroll hyper cast piston used in MY03 and up.
Far right piston is from an 06 STI with 15k on it that was pushed and pinged hard, it broke ring lands, it too is a hyper cast piston




Notice that all pistons have Teflon coating on skirts and all crowns are ceramic coated to reduce heat to the crown.

The JDM piston has done 3475km.

For the people asking what's the difference ?
When you forge a piston you ram the shape into the back, this gives a smooth finish, when you cast a piston you poor alloy into the mould, and most times it is a sand casting which shows in the grain finish. Castings also can allow you to add ribs for strength, with a hyper cast piston the casting is done via pressurizing the liquid alloy into the mould, this increases the density and reduces the chances of casting flaws and holes.

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"You can turn your back on a person, but, never turn your back on a drug. Especially when it's waving a razor-sharp hunting knife in your eye." - Raoul Duke

All EJ207's you buy from Regents have the forged pistons (the ones 2nd from left in the above photos).

Oh good, the discolored, shit looking ones, beauty

But they do the job best
Octane booster much???

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No more GC8, sad face.
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LOL yep thems the ones

im guessing thats what happens when you use ketchup instead of oil????

yeah i'm joking mmmkay

Agree ^
The JDM STI RA had forgies, the JDM WRX RA had cast pistons
The best fuel, commonly available at the time was BP's Ultimate 98 RON. That's what my 99 drank and it was delivered before the Aus Spec V5/6 STi's.

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Speak to Shane @ SMC Tyres, Unit 6/385 Sevenoaks St Beckenham WA 6107. Mobile 0413 128 087. Tell him Maddog sent you!

What year did ultimate 98 arrive in WA? Anyone remember?

I thought it was 2000 or '01?

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[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

bump... where's the best place for a 207 short block now that regents isnt supplying them anymore? and how much?