Welcome to the North American Subaru Impreza Owners Club Wednesday August 20, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Factory 2.0L Turbo Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 10-30-2002, 01:57 PM   #1
schnoog
*** Banned ***
 
Member#: 8238
Join Date: Jul 2001
Location: Oregon
Vehicle:
2005 A4
Red

Smile VF-35 vs VF-34 vs VF-30

Hi all,

as the name of this thread would suggest, I have a question concerning the VF-30, VF-34, and VF-35.

How do these 3 compare with each other and what are their characteristics. I want it all.....lag time, flow rate, best boost level, etc. Does anyone have any dyno charts for these??

Frankly I've had a hard time finding info on the web concerning the VF-35. I do know that the VF-34 is the VF-30 with roller bearings.

I plan on using one of these turbos for the race track(not the drag strip).

Thanks!
* Registered users of the site do not see these ads.
schnoog is offline   Reply With Quote
Old 10-31-2002, 12:56 PM   #2
SPeeDSiN
Scooby Specialist
 
Member#: 4667
Join Date: Mar 2001
Location: Asheville, NC
Vehicle:
2002 WRX
Black (well kinda)

Default

I was doing the same research today.
From what i have learned so far is that the vf30 and vf35 and very similar, while the vf34 is the more desirable turbo from the type ra.
Please correct me if I am wrong, but wasn't the vf35 introduced to fix some of the problems of shaft breakeage in the vf30?
SPeeDSiN is offline   Reply With Quote
Old 10-31-2002, 01:10 PM   #3
hotsam
Scooby Specialist
 
Member#: 3862
Join Date: Jan 2001
Chapter/Region: NESIC
Location: Boxborough, MA
Default

You can find some turbo descriptions on my page.
hotsam is offline   Reply With Quote
Old 10-31-2002, 04:22 PM   #4
100
Scooby Newbie
 
Member#: 10034
Join Date: Sep 2001
Location: Oakland, CA
Vehicle:
2002 WRX Wagon
WR Blue. niiiice.

Default

I can't make a decision based on this info. How do I find out how each one will make my WRX behave?

Any idea how much will VF34's cost? Does the VF35 spool faster or slower than the VF34? If they're better than VF30's then how come Vishnu and TurboXS aren't using them? Is a VF30 unichip map optimal for these turbos?

Thanks, and great prices!

PEACE

OUT
100 is offline   Reply With Quote
Old 10-31-2002, 06:36 PM   #5
schnoog
*** Banned ***
 
Member#: 8238
Join Date: Jul 2001
Location: Oregon
Vehicle:
2005 A4
Red

Default

I think the VF-35 spools up faster than the 30 and 34. The drawback with the 35 is that it has less high end power.

I wish we could see dyno plots comparing all of these turbos....I'd like to see concrete data that shows the 34 truly does spool up faster than the 30. The price difference is substantial.

Does IHI have a website?
schnoog is offline   Reply With Quote
Old 10-31-2002, 08:38 PM   #6
jpm
Scooby Newbie
 
Member#: 24312
Join Date: Sep 2002
Location: Portland, ME
Vehicle:
2002 wrx wagon
silver

Default

http://vividracing.com/turbodata.pdf

This link may be helpful but I cannot vouch for it's accuracy.
jpm is offline   Reply With Quote
Old 10-31-2002, 09:15 PM   #7
hotsam
Scooby Specialist
 
Member#: 3862
Join Date: Jan 2001
Chapter/Region: NESIC
Location: Boxborough, MA
Default

Schnoog is right...

The VF35 will spool very quickly, but there is also a drop off in top end power.

MRT has a good technical section on their web site.
hotsam is offline   Reply With Quote
Old 10-31-2002, 10:13 PM   #8
Bailey
Scooby Specialist
 
Member#: 12572
Join Date: Nov 2001
Chapter/Region: NWIC
Location: Portland Oregon
Vehicle:
2004 STi
35R is enough

Default

The 30 and 34 are essentially the same turbo, but the 34 is roller bearing and therefore is supposed to spool slightly quicker. Both these turbos will have significantly more lag than stock but have more high end power potential.

The 35 is the same as the 30 but it uses a smaller turbine. So, it will spool quicker than a 30 or 34 but will not be able to flow as much high end.

I recently rode in a friend's WRX with a 35. Using a full catless system and an MBC 15 to 16 psi was achieved around 2900 RPM in 3rd gear full a WOT pull starting at less than 2000 RPM.

I would rank the following IHI turbos in acending order from less lag to most and from least HP to most:

28, 29
34
30 (equal power to 34)
22


Do a search for spool under threads started by austin. He recently posted some data logs that you will be VERY interested in.

Bailey
Bailey is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
VF-34 vs VF-30 vs TD05H 16g line Factory 2.0L Turbo Powertrain 65 01-04-2009 01:24 PM
Anyone have a dyno of a vf-34 vs stock? mrtrex Factory 2.0L Turbo Powertrain 7 10-21-2005 05:22 PM
VF-34 or Sr-30 StarDogChampion Factory 2.0L Turbo Powertrain 13 05-05-2004 09:32 PM
VF-34 vs. VF-30 Parallax Factory 2.0L Turbo Powertrain 23 04-18-2004 01:35 PM
VF 35 vs VF 23 johnwrx Factory 2.0L Turbo Powertrain 4 01-11-2003 10:07 AM


All times are GMT -4. The time now is 07:23 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.