VHF5
Thread Starter
Scooby Regular
Joined: Apr 2004
Posts: 269
Likes: 0
From: HECKMONDWIKE
VHF5 does size matter
HOW GOOD IS A RHF5 HAS I HAVE PUT THIS ON MY CAR AND WANT TO KNOW IF I WILL HAVE TO GET MY ECU REMAPPED?
AND IF I NEED BIGGER INJECTORS?
All i know is that the one i'd taken off was blown and alot smaller in size
than the one i put on off sti 555 (susposed 320 bhp)standard
AND IF I NEED BIGGER INJECTORS?
All i know is that the one i'd taken off was blown and alot smaller in size
than the one i put on off sti 555 (susposed 320 bhp)standard
Last edited by SSCUNK; Dec 19, 2004 at 11:21 PM.
Scooby Regular
Joined: Nov 2000
Posts: 18,658
Likes: 1
From: 32 cylinders and many cats
http://www.ihi-turbo.com/turbo_RHE-RHF.htm
What is the model and year of your car? Saloon or Wagon? Import or UK? STi or WRX or Turbo? What other modifications? Is there a VFxx number on the turbo, if so, what is xx?
If your car is pre-1996 and not an import wagon, it should have come with a TD05 which is a better turbo than what you have fitted I am afraid. TD05 will outflow a VF22 which is the largest of the RHF5 family (assume you don't mean VHF5 since I am not aware of a turbo of that description for a Subaru).
What is the model and year of your car? Saloon or Wagon? Import or UK? STi or WRX or Turbo? What other modifications? Is there a VFxx number on the turbo, if so, what is xx?
If your car is pre-1996 and not an import wagon, it should have come with a TD05 which is a better turbo than what you have fitted I am afraid. TD05 will outflow a VF22 which is the largest of the RHF5 family (assume you don't mean VHF5 since I am not aware of a turbo of that description for a Subaru).
Last edited by john banks; Dec 18, 2004 at 10:40 AM.
Thread Starter
Scooby Regular
Joined: Apr 2004
Posts: 269
Likes: 0
From: HECKMONDWIKE
Originally Posted by john banks
http://www.ihi-turbo.com/turbo_RHE-RHF.htm
What is the model and year of your car? Saloon or Wagon? Import or UK? STi or WRX or Turbo? What other modifications? Is there a VFxx number on the turbo, if so, what is xx?
If your car is pre-1996 and not an import wagon, it should have come with a TD05 which is a better turbo than what you have fitted I am afraid. TD05 will outflow a VF22 which is the largest of the RHF5 family (assume you don't mean VHF5 since I am not aware of a turbo of that description for a Subaru).
What is the model and year of your car? Saloon or Wagon? Import or UK? STi or WRX or Turbo? What other modifications? Is there a VFxx number on the turbo, if so, what is xx?
If your car is pre-1996 and not an import wagon, it should have come with a TD05 which is a better turbo than what you have fitted I am afraid. TD05 will outflow a VF22 which is the largest of the RHF5 family (assume you don't mean VHF5 since I am not aware of a turbo of that description for a Subaru).
what year is the car it came off? if it is off a 96 or 97, it may possibly be a vf22 or vf23, the vf22 is capable of runnning 25psi and vf23 can run 20psi. from the vf22 you could get between 350 and 380 and the vf23 will give you between 330 and 350. hope that helps
Scooby Regular
Joined: Nov 2000
Posts: 18,658
Likes: 1
From: 32 cylinders and many cats
Both are smaller than a TD05, the TD05's compressor flows 9% more than a VF22, and the turbine wheel is bigger, plus it spools up better than the VF22, similar to a VF23. VF22/23 seem to like to explode over 20 PSI, TD05 however, will genuinely hold together at 25 PSI in many cases. You've downgraded turbos I'm afraid if you started with a TD05.
Thread Starter
Scooby Regular
Joined: Apr 2004
Posts: 269
Likes: 0
From: HECKMONDWIKE
does size matter
Originally Posted by john banks
Both are smaller than a TD05, the TD05's compressor flows 9% more than a VF22, and the turbine wheel is bigger, plus it spools up better than the VF22, similar to a VF23. VF22/23 seem to like to explode over 20 PSI, TD05 however, will genuinely hold together at 25 PSI in many cases. You've downgraded turbos I'm afraid if you started with a TD05.
than the one i put on off sti 555 (susposed 320 bhp)standard
Trending Topics
Thread Starter
Scooby Regular
Joined: Apr 2004
Posts: 269
Likes: 0
From: HECKMONDWIKE
Originally Posted by john banks
External physical dimensions are not so relevant. Airflow and efficiency matter in terms of mapping the ECU yes.
What model/year is your car? Saloon or wagon?
What model/year is your car? Saloon or wagon?
Scooby Regular
Joined: Nov 2000
Posts: 18,658
Likes: 1
From: 32 cylinders and many cats
Think the 97 STi had a VF23, and was 280 PS, 276 BHP. There was no genuine 320 BHP version to my knowledge. Lots of people talk up imports to 300-320 BHP, doesn't mean they are.
Yours will have had the larger TD05.
Swapping to a VF23 you might get away with running no other mods, but worth double checking boost, AFR and knock and correcting deficiencies found.
Yours will have had the larger TD05.
Swapping to a VF23 you might get away with running no other mods, but worth double checking boost, AFR and knock and correcting deficiencies found.
Last edited by john banks; Dec 20, 2004 at 06:20 PM.
i currently have a 97 sti and you are right it does have a vf23. the VF23 with a full exhaust including decat, turbo up pipe, decent air filter and optimax with octane booster would give you somewhere between 300 and 310bhp
Originally Posted by john banks
Think the 97 STi had a VF23, and was 280 PS, 276 BHP. There was no genuine 320 BHP version to my knowledge. Lots of people talk up imports to 300-320 BHP, doesn't mean they are.
Thread Starter
Scooby Regular
Joined: Apr 2004
Posts: 269
Likes: 0
From: HECKMONDWIKE
Originally Posted by banny sti
i currently have a 97 sti and you are right it does have a vf23. the VF23 with a full exhaust including decat, turbo up pipe, decent air filter and optimax with octane booster would give you somewhere between 300 and 310bhp
Thread
Thread Starter
Forum
Replies
Last Post
