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Old 09-30-2007, 10:21 PM   #1
jimmy1614
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Default Need help with vf34 on 06 wrx decision.

Ive been reading about my "bolt on" turbo options for a little bit now and was going to go with a vf39. Ive read about the cracks and such so I think im going with a vf34 instead. Im lookin for about 300 all wheel horses and I think this will get me there but with a little more top than the 39. I know that the 34 is more expensive but I think its a better choice overall. I have also read that some people do injectors and fuel pump along with the turbo on 06 wrx's and some dont. I live at 6000 ft in Colorado and Im stage 2, catless, 3" all the way, and cobb ots map. I dont want the duty cycle on my injectors maxed out, but I also read that my injectors flow more fuel than the sti, so Im a little confused. Maybe someone that has delt with this turbo can tell me how they feel about it, and I also would like to know about the injectors and pump. Thanks.
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Old 09-30-2007, 10:27 PM   #2
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if you run that vf34 at stock boost you should have no problems with the stock injectors or fp if you wanna max out that turbo and turn up the boost i would suggest pinks and at least a sti fp but good choice on the vf34 :P i hated my vf39!
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Old 09-30-2007, 11:52 PM   #3
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Go for it... MRT performance runs a Stage C package which involves panel filter, full 3in exhaust, (stock tmic :0 but might as well go for the sti one )
, and a vf30 (vf34 as an option.) they seemed to have good luck with it

I've heard you can add a fuel pump for safety... but you injectors should be fine for a setup as such they are 550cc
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Old 09-30-2007, 11:59 PM   #4
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I did 323 at all 4 wheels with stock inj and fp on my 06 tr. Never hit fuel cut or got above an 11.2 afr at wot. FWIW
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Old 10-01-2007, 12:38 AM   #5
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Im at altitude also so I would think it would even be more on the safe side with the lack of air.
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Old 10-01-2007, 01:44 AM   #6
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You don't need injectors. IMO 06 injectors have been tested to flow close to 600
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Old 10-01-2007, 09:09 AM   #7
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as stated already, assuming you're not planning to but PSI to a rediculous amount, stock injectors will be fine
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Old 10-01-2007, 12:23 PM   #8
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Will the turbo itself without upping the boost levels get me to 300 all wheel? Im pretty sure it will, ive seen lots of vf39's at that power level.
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Old 10-01-2007, 01:26 PM   #9
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Quote:
Originally Posted by jimmy1614 View Post
Will the turbo itself without upping the boost levels get me to 300 all wheel? Im pretty sure it will, ive seen lots of vf39's at that power level.
No. You're going to need to up the boost. The 34 just doesn't flow enough at stock boost levels to hit 300 at the wheels.

To give you an idea we're running a VF37 twinscroll. It's rated the same as the VF30/34, has the same compressor housing, the same turbine wheel, the same compressor wheel. Only difference between the VF37 and a VF30 is the twinscroll turbine housing. Only difference between the VF37 and VF34 is the turbine housing and the center section.

Pushing it to 18lbs with inj. and pump netted us 296HP at the wheels, and 333 torque peaking at 3500.

Granted that's without tuning AVCS (ran outta spacer on the APv1).
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Old 10-01-2007, 03:22 PM   #10
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I am runing a 39 on my 06 and the stock injectors still have plenty of room even at 20psi. I made some rediculous power unfortunatly the clutch gave way and tuning was stoped. Also you may want to think about your tranny giving way. Make sure you have the money to cover your @$$ if it breaks. Just my .02

cheers,
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Old 10-01-2007, 06:24 PM   #11
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I have an 06 with a 34. pe 650cc injectors-walbro fuel pump-STi TMIC-TBE= 295whp/341wtq @ 18psi max TQ at 3200 rpm.
the 34 spools faster also because its ball bearing, the 39 is not a ball bearing.

runs perfect and so much fun^^ please do yourself a favor!
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Old 10-01-2007, 06:28 PM   #12
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I have an 06 w/ VF34. Used stock injectors but with a walbro fuel pump. Some porting in the intake and TMIC upgrade. I made 263 WPH with 15PSI. Oh, was using pump gas (90 octane) btw.
Only could reach 15 PSI because we had ported the wastegate. We are working on my engine right now and plan to do more than 300 HP and 20-22 PSI. We shall see. Will be using Torco.

Last edited by Firestrike; 10-01-2007 at 06:36 PM.
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Old 10-01-2007, 08:30 PM   #13
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Quote:
Originally Posted by Turn in Concepts View Post
No. You're going to need to up the boost. The 34 just doesn't flow enough at stock boost levels to hit 300 at the wheels.

To give you an idea we're running a VF37 twinscroll. It's rated the same as the VF30/34, has the same compressor housing, the same turbine wheel, the same compressor wheel. Only difference between the VF37 and a VF30 is the twinscroll turbine housing. Only difference between the VF37 and VF34 is the turbine housing and the center section.

Pushing it to 18lbs with inj. and pump netted us 296HP at the wheels, and 333 torque peaking at 3500.

Granted that's without tuning AVCS (ran outta spacer on the APv1).
.....happened to me, too....

....and a vf30/34 on the 2.5 is a waste of time....the vf30/34 are disposeable/non-re-buildable turbos.....an evoIII 16g is a FAR-FAR better choice
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Old 10-01-2007, 08:42 PM   #14
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Quote:
Originally Posted by Gettingthere View Post
I have an 06 with a 34. pe 650cc injectors-walbro fuel pump-STi TMIC-TBE= 295whp/341wtq @ 18psi max TQ at 3200 rpm.
the 34 spools faster also because its ball bearing, the 39 is not a ball bearing.

runs perfect and so much fun^^ please do yourself a favor!
Very nice figures. If you get a thermal wrap and a water sprayer/mister, you would be about 310 or more. But those numbers are very good.
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Old 10-01-2007, 09:52 PM   #15
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Are you guys saying I can acomplish the same thing with a vf39? Seems they both put out about the same #'s at stock boost levels but the 39 isnt ball bearing. Sorry for all of the questions I just want to make the right choice. Im also lookin for the easiest swap possable, I dont want to get into some crazy stuff, this is my daily driver. As for the tranny, I think ppg's cost about 3,500 and I can cover that, I will just wait till something happens. Even with the turbo swap we are down about 25% in power up here so It wont be as harsh on the tranny. I figure the car will feel like an 06 wrx at stage 2 at sealevel. My car is at stage 2 now and I figure it feels how the car would feel stock at sealevel.
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Old 10-02-2007, 02:16 AM   #16
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Can I use the Cobb vf39 map with a vf34 installed until I get tuned? I know they are pretty similar turbos, maybe there is one I can dowload from Cobb.
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Old 10-02-2007, 08:22 AM   #17
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Quote:
Originally Posted by jimmy1614 View Post
Are you guys saying I can acomplish the same thing with a vf39? Seems they both put out about the same #'s at stock boost levels but the 39 isnt ball bearing. Sorry for all of the questions I just want to make the right choice. Im also lookin for the easiest swap possable, I dont want to get into some crazy stuff, this is my daily driver. As for the tranny, I think ppg's cost about 3,500 and I can cover that, I will just wait till something happens. Even with the turbo swap we are down about 25% in power up here so It wont be as harsh on the tranny. I figure the car will feel like an 06 wrx at stage 2 at sealevel. My car is at stage 2 now and I figure it feels how the car would feel stock at sealevel.
Yes you can.
Theay are relatively the same.
The VF30/34/39 are all basicallty the same. The 34 will however spool sooner than the 30 and the 39. But look to achieve the same gains from the 3 with similar mods.
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Old 10-02-2007, 11:13 AM   #18
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Hmm. Thanks.
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Old 10-02-2007, 10:43 PM   #19
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I put a vf/39 on my 06 and it runs great for a daily driver.
perrin t/m
255 pump
cobb d/p--sti c/b
stock intake with perrin inlet hose
Tim Bailey tune= 288hp/ 320tq.
My wife likes the 'passing power'[ she is 60 years old]
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Old 10-03-2007, 12:18 PM   #20
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I would like to know what kinds of numbers you get once you tune it. I got an 07 wrx tr and looking to upgrade to a vf39 also. I recommend you go to revolutions in CO springs for your tune. They did the stage 2 protune on wrx. Highly recommend them.
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Old 10-03-2007, 12:55 PM   #21
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Quote:
Originally Posted by silver-duck View Post
I put a vf/39 on my 06 and it runs great for a daily driver.
perrin t/m
255 pump
cobb d/p--sti c/b
stock intake with perrin inlet hose
Tim Bailey tune= 288hp/ 320tq.
My wife likes the 'passing power'[ she is 60 years old]
If you don't mind me asking, So your wife is 60 and assuming that you guys are similar in age, you are modding a wrx?

That's tight!
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Old 10-10-2007, 05:31 PM   #22
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^LOL that is
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Old 12-17-2007, 01:59 AM   #23
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Any of you protuned/swapped individuals having drivetrain (namely 3rd) problems?
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Old 12-17-2007, 10:54 AM   #24
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Quote:
Originally Posted by Iflysti06 View Post
if you run that vf34 at stock boost you should have no problems with the stock injectors or fp if you wanna max out that turbo and turn up the boost i would suggest pinks and at least a sti fp but good choice on the vf34 :P i hated my vf39!
OK, pinks flow the same as STI topfeed and 06-07 WRX sidefeeds. STI and WRX fuel pumps are identical as well. Please, do some research before giving advice that could waste someones money.

Also, how could you like a vf-34 and hate a vf-39? They are basically the same turbo!! Difference is ball bearing so spool might be a little quicker, 34 usually doesn't crack, and the 34 costs almost twice as much. If you search around, how many people have actual issues with a cracked 39 anyway? I do not recall any at the moment.

Quote:
Originally Posted by Uncle Scotty View Post
.....happened to me, too....

....and a vf30/34 on the 2.5 is a waste of time....the vf30/34 are disposeable/non-re-buildable turbos.....an evoIII 16g is a FAR-FAR better choice
Considering a 16g will cost twice as much as a vf-39, I will personally stick with the 39. The loss of spool on the 16g for the limited top end aside, for the cost of 1 16g I could just have a 39 and buy another when/if it dies. This is not considering the cost of rebuilding a 16g, and assuming it will last longer than a 34/39.

Quote:
Originally Posted by WRX06TR View Post
Any of you protuned/swapped individuals having drivetrain (namely 3rd) problems?
20k on a vf-39, no issues yet. Shifting nice....
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