Sorry FAIL on the above bits of info (Repost from OzLiberty forum)

VF39 is a PZ18 exhaust housing..
also

VF43 is a PZ18 exhaust housing.....
which makes sense as Subaru would not put a smaller P15 exhaust housing on the larger 2.5lt EJ257 engine for the OZ/US MY06-07 STi.

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08 STI

VF48 is from all reports, visually the same as the VF30/39/43. Same compressor wheels.

http://forums.nasioc.com/forums/show....php?t=1448309
http://forums.nasioc.com/forums/show...php?p=21666807

Changes at this stage seem to be to the wastegate actuator and arm compared to the VF43.

J

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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

VF-46 MY07 USDM and AUS Legacy

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Funny looking German Subaru

I definitely get surge when i floor it in 4th while building up boost. Makes a funny little chchchch noise for a 2-3 seconds while it's spooling.

Doesn't appear to effect the onset of boost/torque though.

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Should have bought an STI

Thats a common problem pretty sure it happens to most of us with vf turbos.

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M POWER

Ive had a VF 22,23,34
34 was the only turbo that surged for me
Might be a common problem by the sounds of it.

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11.1 @ 127mph

I think it's common when you have a silicone intake.

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Should have bought an STI

i get no surge from my vf-22

yeah im getting surge from the 34 too, brad. after all its yours

i thought it was coz i got it angle mounted and it had oil pressure issues giving too much load on the bearings.

It was fine on the 2ltr. But when I built the 2.2 thats when it started.
There is about 4 other 34s I know with the same problem.

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11.1 @ 127mph

I don't think it's really a 'problem', it's just the turbo trying to flow more than the motor can ingest. I suspect you'd want some headwork and cams to prevent it?

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Should have bought an STI