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Old 01-18-2004, 01:55 AM   #1
WRXout
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Default Vf35

I heard that the VF35 is a really good turbo for an automatic WRX, is the 35 really that good....can i get the same out of a 35 with another cheaper turbo on my auto rex?
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Old 01-18-2004, 02:59 AM   #2
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I believe the 35 is the same compressor as the VF30/34, but has a smaller exhaust housing so spools a bit faster. But they are still hard to come by and usually >$900.

*what I just wrote might be totally wrong.
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Old 01-18-2004, 03:45 AM   #3
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if you want a streetable fast car, low and top end, go with the vf35 . If you want lots of top end get a vf30...


Steve
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Old 01-18-2004, 06:26 AM   #4
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Quote:
if you want a streetable fast car, low and top end, go with the vf35 . If you want lots of top end get a vf30...
This is only theoretical, I didnīt see much of a difference in top end performance in cars I tuned. (On pump fuel that is) The spool up is definatly better with the 35. Look out for boost creep when using the 35! Port the wastegate before fitting, if you donīt like to gamble.......

Mark.
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Old 01-18-2004, 09:00 AM   #5
nhluhr
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Quote:
Originally posted by mexicanpizza
I believe the 35 is the same compressor as the VF30/34, but has a smaller exhaust housing so spools a bit faster. But they are still hard to come by and usually >$900.

*what I just wrote might be totally wrong.
Once upon a time, before "NASIOC", in the olde time of the original "I-Club", there was a guy who ran a group buy for VF30s at $725 shipped. Well, when those 25 turbos came in, many of them were VF35s instead and those lucky individuals that received them got to keep them at that price.

However, this group buy undercut all vendors who were at the time selling these turbos for $900+. That "person" got banned from I-Club and all kinds of things happened, like the inception of the new name "NASIOC"

Ah... this board has many stories to tell....

I love my $725 dollar VF35
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Old 01-18-2004, 09:30 AM   #6
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Quote:
Originally posted by nhluhr
Once upon a time, before "NASIOC", in the olde time of the original "I-Club", there was a guy who ran a group buy for VF30s at $725 shipped. Well, when those 25 turbos came in, many of them were VF35s instead and those lucky individuals that received them got to keep them at that price.

However, this group buy undercut all vendors who were at the time selling these turbos for $900+. That "person" got banned from I-Club and all kinds of things happened, like the inception of the new name "NASIOC"

Ah... this board has many stories to tell....

I love my $725 dollar VF35
Stop spreading your filthy lies! The board is perfect! The board is sound! The board has always been here, just like it is!! NOTHING EVER GOES WRONG!!
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Old 01-18-2004, 10:19 AM   #7
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Default VF-35 Boost Creep

Quote:
Originally posted by EMS
This is only theoretical, I didnīt see much of a difference in top end performance in cars I tuned. (On pump fuel that is) The spool up is definatly better with the 35. Look out for boost creep when using the 35! Port the wastegate before fitting, if you donīt like to gamble.......

Mark.
I am considering getting a VF-35. Could someone explain to me the cause of boost creep, and why it is more likely in a VF-35 than a VF-30?

Thanks
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Old 01-18-2004, 10:56 AM   #8
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you're more likely to get boost creep because the vf35 spools up faster making it harder for the wastegate to keep up. Just port it before install as was mentioned above and you'll be ok.
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Old 01-18-2004, 01:13 PM   #9
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how would i port it?
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Old 01-18-2004, 03:21 PM   #10
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http://forums.nasioc.com/forums/show...sponaugle+dyno

I know the previous owner of this VF35, and he had boost creep issues. He maintains the hks downpipe, with its oem-style flat flange at the turbo, was the culprit.

I haven't heard of boost creep issues from the current owner, but I don't know him personally.

The above set-up was tuned by Clark from Kingpin, so I'm thinking that's a pretty good state of tune...
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Old 01-18-2004, 06:28 PM   #11
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Quote:
Originally posted by rogue
Stop spreading your filthy lies! The board is perfect! The board is sound! The board has always been here, just like it is!! NOTHING EVER GOES WRONG!!
word... alex who? member #1??!??! never heard of him!
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Old 01-18-2004, 10:04 PM   #12
WRXout
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PEANUS BUTTER JELLY!
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Old 01-19-2004, 04:46 AM   #13
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I know the previous owner of this VF35, and he had boost creep issues. He maintains the hks downpipe, with its oem-style flat flange at the turbo, was the culprit.
Iīve seen LOTS of VF35 equiped cars overhere in Holland, this is because "our" STi has fitted the VF35 as standard. I can tell you, EVERY VF35 equiped car does have boost creep if you reduce the exhaust back pressure! We tested with all possible up- and downpipe designs to avoid boost creep, none of these helped. The only way to avoid boost creep is to increase the diameter of the wastegate. (to just under the diameter of the flapper)

Iīve had one car with an Invidia 3" straight through system, that needed to be fitted with a bigger waste gate flapper to avoid boost creep! (normal porting didnīt help)

P.S. I see (and tune) about 30 VF35 equiped cars per year.

Mark.
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Old 02-17-2004, 07:14 PM   #14
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the vf35 is sounding nice!! what is it like?? hp? spool?
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Old 02-17-2004, 08:23 PM   #15
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Quote:
Originally posted by rogue
wellcome to itchy and scratchy land where NOTHING could posibli go WRONG!!
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Old 02-18-2004, 08:07 PM   #16
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Quote:
Originally posted by EMS
Iīve seen LOTS of VF35 equiped cars overhere in Holland, this is because "our" STi has fitted the VF35 as standard. I can tell you, EVERY VF35 equiped car does have boost creep if you reduce the exhaust back pressure! We tested with all possible up- and downpipe designs to avoid boost creep, none of these helped. The only way to avoid boost creep is to increase the diameter of the wastegate. (to just under the diameter of the flapper)

Iīve had one car with an Invidia 3" straight through system, that needed to be fitted with a bigger waste gate flapper to avoid boost creep! (normal porting didnīt help)

P.S. I see (and tune) about 30 VF35 equiped cars per year.

Mark.
Do you know how we can get a hold one or two?
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Old 02-18-2004, 08:49 PM   #17
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I had a VF35 I got from aus. from a guy who upgraded his stock STi. I picked it up for around $500 and it looked new Cruise the boards over at scoobynet.co.uk and maybe the MRT forums to find a low mileage take-off from a non-jdm STi

My VF23 felt similar in power but had much more under the curve I thought.
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Old 02-19-2004, 10:20 PM   #18
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Sorry , what do you mean under the curve?
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Old 02-19-2004, 10:29 PM   #19
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Quote:
Originally posted by bigjohnknob
Sorry , what do you mean under the curve?
the numbers that are under the curve on the graph not just where it peaks. this is the meat and potatoes of the turbo.
basically looking at your low and mid range. dyno graphs just highlight the peak #'s visually.

hope that makes sense.
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Old 02-20-2004, 12:28 AM   #20
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What amount of PSI does this turbo make at 2500rpms compared to the stock TD04 at 2500rpms?

Will this VF35 run ~17psi at the redline?

Thanks!
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