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"AP" Member Project Logs / Re: What are these odd looking things?
« Last post by dsrace on February 20, 2021, 09:00:23 AM »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).


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 "

-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).