Welcome to the North American Subaru Impreza Owners Club Friday August 29, 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 General > Motorsports

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 11-09-2005, 11:17 AM   #1
mrtrex
Scooby Specialist
 
Member#: 12223
Join Date: Nov 2001
Chapter/Region: MAIC
Location: Pittsburgh Pa
Vehicle:
2005 WRX

Default Is a VF-34 to Big For Autocross

I run SM already. Is this turbo going to have to much lag pulling out of the bends? Should I just stick with the stock td04 and get it ported and polished instead? My mods are the following:

Vishnu Reflashed ECU
Turboback Exhaust
Up-Pipe
Bigger Intercooler
* Registered users of the site do not see these ads.
mrtrex is offline   Reply With Quote
Old 11-09-2005, 11:40 AM   #2
Car vs. Driver
Scooby Specialist
 
Member#: 81620
Join Date: Feb 2005
Chapter/Region: MAIC
Location: Delaware
Vehicle:
2004 350Z
406WHP/350WTQ

Default

I'm not 100% about this turbo ... but I can offer some general advice ...

For autocross you want more "useable" power, broader torque curve, etc rather than high peak HP/TQ numbers. So, if that's something you can get from this, then go for it.

Figure it this way, the average autocross is 2nd gear, maybe 3rd at times. So you'll want to pick your turbo based on where you're going to be in RPM's and gears. This, of course, is provided that your ultimate goal is a solod autocross car, not a high HP monster.
Car vs. Driver is offline   Reply With Quote
Old 11-09-2005, 11:44 AM   #3
fliz
Scooby Guru
 
Member#: 30342
Join Date: Nov 2002
Location: #blp
Default

I certainly hope not.

I'm installing one in my car to run locally next year. It won't compete with the 400+whp GC dwx is building, but I'm hoping it will hold it's own against the swapped Civics.
fliz is offline   Reply With Quote
Old 11-09-2005, 11:46 AM   #4
crystalhelix
Scooby Guru
 
Member#: 35313
Join Date: Apr 2003
Chapter/Region: MAIC
Location: SpryRacing.com AgileAuto.com
Vehicle:
Spry Forester
Silver Spark

Default

IMO the stock WRX turbo is laggy as is and the VF34 would only add to your top end, so maybe a port and polish would be good. Is there any data that shows a HP/TQ curve for a pnp TD04?
crystalhelix is offline   Reply With Quote
Old 11-09-2005, 01:02 PM   #5
mrtrex
Scooby Specialist
 
Member#: 12223
Join Date: Nov 2001
Chapter/Region: MAIC
Location: Pittsburgh Pa
Vehicle:
2005 WRX

Default

Quote:
Originally Posted by crystalhelix
IMO the stock WRX turbo is laggy as is and the VF34 would only add to your top end, so maybe a port and polish would be good. Is there any data that shows a HP/TQ curve for a pnp TD04?
That is what I am thinking. The Monster Port and Polish from deadbolt looks good. I also can run that on my ecutek with out getting a retune. I just spoke to vishnu and they said that a retune would not be needed. It would shift my tq curve to the left a little and improve throttle responce.
mrtrex is offline   Reply With Quote
Old 11-09-2005, 04:25 PM   #6
fliz
Scooby Guru
 
Member#: 30342
Join Date: Nov 2002
Location: #blp
Default

Quote:
Originally Posted by mrtrex
That is what I am thinking. The Monster Port and Polish from deadbolt looks good. I also can run that on my ecutek with out getting a retune. I just spoke to vishnu and they said that a retune would not be needed. It would shift my tq curve to the left a little and improve throttle responce.
Have you considered leaving the turbo alone and dropping down to ESP?

With the boost deregulation, the WRX is a better competitor in ESP than SM.
fliz is offline   Reply With Quote
Old 11-09-2005, 04:40 PM   #7
omahasubaru
Scooby Guru
 
Member#: 1594
Join Date: Jun 2000
Chapter/Region: MWSOC
Location: Gretna, NE
Vehicle:
1995 WRX
2002 Legacy

Default

Pick up a VF24/28 and have it ported/polished.

Or go with a TD05-16g with the same work. VF34 would be fine, if you had a 2.2 or 2.5, but with the 2.0, you would benifit more from a less larger turbo for autocross.

Just my $0.02
omahasubaru is offline   Reply With Quote
Old 11-09-2005, 04:49 PM   #8
psyber_0ptix
Scooby Guru
 
Member#: 60671
Join Date: Apr 2004
Chapter/Region: NESIC
Location: Fairfax, VA
Vehicle:
1992 Miata

Default

why not get a tune?

unabomber was cobb stage 2 (shelf map) and pulled 223whp/xxxtq

the same day that my cobb stage 2.5 pulled a mere 243whp/232tq

he had pnp stocker pulley and other small mods but is 1000 dollars the way to be spending to make your car gain 20 hp?

unabomber ahs since gone ecutek iirc and pulled #'s extremely close to mine, but with a sick quick spool.


i'd take that 1000 and invest in an autoX school for more seat time. and maybe get a tuned map.
psyber_0ptix is offline   Reply With Quote
Old 11-09-2005, 05:09 PM   #9
crystalhelix
Scooby Guru
 
Member#: 35313
Join Date: Apr 2003
Chapter/Region: MAIC
Location: SpryRacing.com AgileAuto.com
Vehicle:
Spry Forester
Silver Spark

Default

Quote:
Originally Posted by fliz
Have you considered leaving the turbo alone and dropping down to ESP?

With the boost deregulation, the WRX is a better competitor in ESP than SM.
arg...smacks self in head

Forgot to tell you toms, 99% chance next year you can change boost in ESP for the WRX. A lot of SM people will be dropping into SP classes, that's also a good option. ESP is a pretty good class here too, it would be good competition. No worries about me, I will be in BSP.

J

PS - just PM me if you need any rules clarification.
crystalhelix is offline   Reply With Quote
Old 11-09-2005, 05:11 PM   #10
psyber_0ptix
Scooby Guru
 
Member#: 60671
Join Date: Apr 2004
Chapter/Region: NESIC
Location: Fairfax, VA
Vehicle:
1992 Miata

Default

oh yea, i have a vf34 and autoX, it isnt that great if you let off the throttle.

just run some sticky tires and learn to keep your foot mashed and left foot brake, or never fully lift. and you'll be fine. it really helps on straits. but its hard to drive smoothly sometimes
psyber_0ptix is offline   Reply With Quote
Old 11-09-2005, 07:14 PM   #11
Samurai Jack
Scooby Specialist
 
Member#: 21145
Join Date: Jul 2002
Chapter/Region: NESIC
Location: Not in my own time
Vehicle:
2002 Enemy of Aku

Default

Quote:
Originally Posted by omahasubaru
Or go with a TD05-16g with the same work. VF34 would be fine, if you had a 2.2 or 2.5, but with the 2.0, you would benifit more from a less larger turbo for autocross.

Just my $0.02
TD05-16G and VF34 are essentially the same but the VF34 is a roller bearing turbo where the16G is a thrust bearing turbo. So the VF34 will have ~200 - 300RPM quicker spool over the TD05-16G.

P&P the 16G, and you have balanced them out. P&P the VF34, and the VF34 gains again.
Samurai Jack is offline   Reply With Quote
Old 11-09-2005, 09:25 PM   #12
vintagemilano
Scooby Newbie
 
Member#: 92528
Join Date: Jul 2005
Location: in transition north>south Can.
Vehicle:
2000 2.5RS coupe
blue ridge

Default

If I were building a dedicated turbo car for autocross, I would be putting a smaller turbo in. Something that spools lightning quick, then tune the final car by chosing a tire size to put the gearing in the right place.
vintagemilano is offline   Reply With Quote
Old 11-10-2005, 01:28 AM   #13
psyber_0ptix
Scooby Guru
 
Member#: 60671
Join Date: Apr 2004
Chapter/Region: NESIC
Location: Fairfax, VA
Vehicle:
1992 Miata

Default

16g

quick spool and top end (compared to vf34)

of course spool can be reduced by an aggresive TUNE
psyber_0ptix is offline   Reply With Quote
Old 11-10-2005, 10:11 AM   #14
Sideshowbob
Scooby Guru
 
Member#: 50304
Join Date: Dec 2003
Chapter/Region: NESIC
Location: Smalbany NY
Vehicle:
97 TJ, 04 Matrix
XR70R, 03 Gas Gas 250

Default

Quote:
Originally Posted by psyber_0ptix
16g

quick spool and top end (compared to vf34)

of course spool can be reduced by an aggresive TUNE
The regulsr (non Ti) 16G isn't really much better than the VF34 for spool.

I think a VF34 is FINE for AutoX
Sideshowbob is offline   Reply With Quote
Old 11-10-2005, 10:20 AM   #15
psyber_0ptix
Scooby Guru
 
Member#: 60671
Join Date: Apr 2004
Chapter/Region: NESIC
Location: Fairfax, VA
Vehicle:
1992 Miata

Default

i STILL think a vf34 with a tune would be much better than any off shelf vf34 map.

but it doesnt seem people want to accept or consider it
psyber_0ptix is offline   Reply With Quote
Old 11-10-2005, 10:40 AM   #16
DOHCammin
Scooby Specialist
 
Member#: 41290
Join Date: Aug 2003
Chapter/Region: SCIC
Location: www.subaruforester.org
Vehicle:
2000 OBS

Default

Quote:
Originally Posted by psyber_0ptix
i STILL think a vf34 with a tune would be much better than any off shelf vf34 map.

but it doesnt seem people want to accept or consider it
I think most people agree, off the shelf maps are good for a "quick fix" but not good for safety or longevity. you can always squeeze out more power with a custom tune because off the shelf maps are way conservative for safety reasons.

looks like I have to learn auto-x in ESP class, just got my VF34 yesturday
DOHCammin is offline   Reply With Quote
Old 11-10-2005, 10:54 AM   #17
subieworx
Scooby Guru
 
Member#: 47769
Join Date: Nov 2003
Chapter/Region: MWSOC
Default

I wouldn't even bother. You would be better of spending the extra money on suspension bits and better yet driving schools than the turbo if autox is your ultimate goal. If not, then the turbo will work alright, but is not ideal. If anything a clipped stocker would work even better.
subieworx is offline   Reply With Quote
Old 11-10-2005, 12:01 PM   #18
MattNJ2.8
Scooby Specialist
 
Member#: 59277
Join Date: Apr 2004
Chapter/Region: Tri-State
Location: Central NJ
Vehicle:
2005 2009 Outback
Mazda3, Miata

Default

I auto-x'd my VF34'd '04 WRX for a while.

Highly do NOT recommend this turbo for this application. Get a good tune, and spend that $$$ on suspension and R compounds. You will be WAY faster.

For suspension, get a big front bar, decent rear bar, and a set of decent (not TEIN) coilovers.
MattNJ2.8 is offline   Reply With Quote
Old 11-10-2005, 12:13 PM   #19
psyber_0ptix
Scooby Guru
 
Member#: 60671
Join Date: Apr 2004
Chapter/Region: NESIC
Location: Fairfax, VA
Vehicle:
1992 Miata

Default

i have a 'small' fsb upgrade and a larger



seems to work well for me

21mm front 22 adjustable rear set to stiffest.

but want to drive fast? become a better driver.

fast cars dont make fast drivers
psyber_0ptix is offline   Reply With Quote
Old 11-10-2005, 01:24 PM   #20
mrtrex
Scooby Specialist
 
Member#: 12223
Join Date: Nov 2001
Chapter/Region: MAIC
Location: Pittsburgh Pa
Vehicle:
2005 WRX

Default

I have all the supporting suspenion mods. I think I am going with the deadbolt monster td04 and a tune. I drive the car on the street as well it is not strictly an autocross car.
mrtrex is offline   Reply With Quote
Old 11-10-2005, 02:51 PM   #21
terry61oz5
Scooby Newbie
 
Member#: 66809
Join Date: Jul 2004
Location: Cookeville,TN
Vehicle:
04 FXT StreetTuner
Silver

Default re

Stock TD04 unpolished with 19Lbs helper spring not quite fully preloaded. It makes 16psi of down low torque very early on a 2.5L. You'll have to concentrate on the frontwheel traction (w/4:44 r&p)especially in turns under a good load. ECU compensates easily with 93+ octane.

Last edited by terry61oz5; 11-10-2005 at 02:57 PM.
terry61oz5 is offline   Reply With Quote
Old 11-10-2005, 06:56 PM   #22
abaxter34
Scooby Specialist
 
Member#: 34723
Join Date: Apr 2003
Chapter/Region: NWIC
Location: Bellingham, WA
Vehicle:
fwd FTL!

Default

isnt anti-lag legal in sm. why not go with utec and run the anti-lag for the mere 60 seconds your run lasts.
abaxter34 is offline   Reply With Quote
Old 11-10-2005, 11:02 PM   #23
WJM
Guest
 
Member#:
Default

Just get on the gas earlier....unless the turbo is prepped properly for anti-lag...it will be destroyed in short order with the use of anti-lag.
  Reply With Quote
Old 11-10-2005, 11:59 PM   #24
psyber_0ptix
Scooby Guru
 
Member#: 60671
Join Date: Apr 2004
Chapter/Region: NESIC
Location: Fairfax, VA
Vehicle:
1992 Miata

Default

Quote:
Originally Posted by abaxter34
isnt anti-lag legal in sm. why not go with utec and run the anti-lag for the mere 60 seconds your run lasts.

utec doesnt support anti-lag, thats launch control
psyber_0ptix is offline   Reply With Quote
Old 11-11-2005, 01:31 AM   #25
Duo
Scooby Specialist
 
Member#: 38620
Join Date: Jun 2003
Chapter/Region: SCIC
Location: Tarzana
Vehicle:
2005 Subaru WRX STI
OBP

Default

you guys should make a 100 heatsoak map. You would be amazed how much torque even with a cat you can get out of your td04. I run it for rallycross, sorta the same thing. With my map I have 250ft/lbs of torque with the tdo4 on 100 octane. Mods are tbe, up pipe, and intercooler hoses also i run the eq tuning solinoid. The solinoid just helops with spool. Just thought i might offer that.
Duo 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
FS: VF-34 to be rebuilt bxracer69 Engine/Power/Exhaust 3 01-29-2009 08:37 PM
vf 34 vs big evo 3 16g jacktheripper Factory 2.0L Turbo Powertrain 77 12-02-2007 03:00 AM
vf-34 to vf-22 jcan0045 Factory 2.5L Turbo Powertrain 5 03-15-2007 03:02 PM
vf-34 or big 16g superdupersubaru Factory 2.0L Turbo Powertrain 15 03-03-2006 10:09 AM
I've been searching but I can't find what is a vf 34??? Yea , Yea i'm noobie BBBsti LTD Factory 2.0L Turbo Powertrain 2 05-11-2005 12:36 PM


All times are GMT -4. The time now is 01:14 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.