Yeah probably that's what it is
...you didn't have any head work done on yours though?

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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...

It got valves, springs, retainers etc. But the only thing that would really increase power in the heads was a mild cam upgrade really. Kelford r199a.

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Doing it for all the wagons out there

Bram has as much as you had done

using the Perth-WRX mobile app

Thats sweet...didn't know.
So we got similar setups except I got bigger/different cams and few higher rated components?
Do you have a Blouch too?
Be interesting to compare power figures in a few weeks

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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...

Yeah, I have a blouch. But its a TD05-18G-XT, with 8cm rear. Got the ceramic coated hotside and the upgraded actuator. The upgraded actuator means this turbo physically CANNOT boost less than 18-19 pound. Basically its just a billet wheel TD05. It spools almost instantly. But it just doesnt flow quite enough. I think Ive pretty much maxed it out. A blouch 2.5xtr will perform alot better. I bought my turbo before the engine blew. It would be a good match for a stock engine. But is a bit small for a built up motor.

Im thinking of going a much bigger turbo, external gate screamer, twist mount, get rid of the TMIC in favour of a FMIC, and reverse the intake mani. And see where that gets me.

Ive removed my A/C already, so I have plenty of room infront of the radiator for a thick front mount, and no compressor means I could relocate the alternator and flip the mani.

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Doing it for all the wagons out there

Nice it should be monster spec after that...
Maybe get a Blouch 3.0xtr, it is their redesigned twin ball bearing garret gtx3076r...its expensive but is a monster minus the lag

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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...

This car needs more Precision and less blouch.

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The one perkent...

has anyone done a back to back on a GTX30 Vs a Blouch GTX30?

just get a precision 6262 and win at life

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R32 GTR - 800ish

60.7 Long Track at Barbs
57.6 at RAC Reverse circuit.

I checked out Precision but not enough data on their bolt on turbo... staying with Blouch until there's some real data on their bolt on solution.

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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...

Most of the twisted mount turbo cars in the UK used the Billet blouch 30 and 35's. My old GC8 had a blouch Billet 35R on it and it was awesome.

A car with a twisted mount Blouch GT30R would always deliver a lot more power than it's stock position GT30 equivalent. the average seemed to be about 50bhp more although I have seen as much as 90-100bhp.
I've seen a Billet blouch GT30R do over 600bhp (flywheel) on pump fuel with a splash of methanol but this was on a stroked EJ22T engine. They rev considerably better than the 2.5's

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605whp
Quarter Mile in 10.9 seconds @ 135mph /217kph
0-100 kph 3.2 seconds