i do understand flow plays a large roll in driving the turbo. that's why i said my dual valve head doesn't flow as well as a quad valve but my head does or did flow 210 cfm bo ports flow bench. that's what he rates the stage 3 heads at which is a huge improvement over the stock 150 cfm for sure. a sealed exh manifold really helps too    i do need to address that before the trip!


https://www.i-club.com/forums/norcal-classifieds-96/fs-jdm-v7-sti-vf30-turbo-blown-266221/
IHI VF30
(460cfm at 18psi, 250-325whp, Bolt-On)

This is the standard equipment turbocharger used on the JDM V7 Subaru Impreza WRX STi (2002-2003 - bug-eye). The VF30 is a thrust-bearing turbo that utilizes the P18 exhaust housing of a VF24 and the compressor housing sized between a VF23 and a VF22. Expect to achieve full boost with the proper mods and a quality tune between 3000-3500rpms.

for comparison the one you have been running is close to the 83 to 86 but i believe you have the .48 exh so full boost should be closer to 2200 rpm.

https://www.stinger-performance.com/faq.html
-Stock (87-88 Turbo Coupe) Ishi-Warner IHI: Less than 250 rwhp, super quick spooling (full boost at 1800-2300 rpm with a few airflow mods) but runs out of steam at higher engine speeds. Great for heavy cars or daily drivers. Good to 18psi or so.

-Stock (83-86 Mustang/Turbo Coupe, 84-89 Merkur) Garrett/AiResearch T3: Up to about 275 rwhp. Full boost at 2500-3000 rpm or so with a few airflow mods, pulls pretty well up top. Has a very hard "" when boost kicks in. Great for a daily driver/street terror with minor mods. Good to 23 psi or so if you've got enough fuel, octane, intercooling, etc. to safely run that much.

-T3/T4 Hybrid T04E 46 trim compressor/Stage III exhaust side with .48 a/r for street cars, .63 a/r for street/strip. Great for engines in the 250-350rwhp range. Full boost at 3000-3300 rpm or so with a header and supporting mods. Nice linear power throughout rpm range. Great for street/strip cars in the 12-13 second 1/4 mile range. Good to 25psi or so.

-T3/T4 Hybrid T04E 50 trim compressor/Stage III exhaust side with .48 a/r for street cars, .63 a/r for street/strip: Great for engines in the 300-410 rwhp range. Full boost at 3300-3500 rpm or so with supporting mods. Nice linear power throughout rpm range. Great for street/strip cars in the 11-12 second 1/4 mile range. Good to 35psi or so (if your tune and engine can handle it).

This current turbo is probably still fine, but I am upgrading since everything else is new. I have been working with Ecotech Imports from Ks City, MO on the turbo and other parts. They have experience with building and racing these motors, and seem to understand this thing we call "sand duning"! We had decided on a IHI VF48, but I got a text last night saying he was sending a VF30 V7. He was already gone for the day, so I will get an explanation later. I still need to get more E85 and run through my current system, since I have modified the fuel tank.

3rd gear wheelies? Why not shoot for 5th gear wheelies?!

now that's what i'm talking about 

the ihi series turbo's are smaller like the stock ihi i was going to give you off the stock 87-88 ford thunderbird.  would be interesting to know the comp and turbine wheel sizes.  did they say if these turbo's will breathe on the top end or are low end spooling turbo's and just make heat over say 5500 rpm?

This is prior to inserts.

Well done.

This is prior to inserts.

Is the logan a flat belt?