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Old 09-22-2007, 12:49 PM   #26
jmonty
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how does the VF43 compare to a VF39?
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Old 09-24-2007, 10:56 AM   #27
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Quote:
Originally Posted by jmonty View Post
how does the VF43 compare to a VF39?
From the definitions section

Quote:
Originally Posted by Unabomber
Boost creep when with the wastegate open, boost rises over target levels. This is normally seen at high RPMs or during cold weather. It is usually attributed to the wastegate being too small. Common fixes are tuning to combat the problem or wastegate enlargement. Case in point, the replacement of the VF39 with the VF43 on the STI; identical turbos, but the VF43 has a larger wastegate.
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Old 01-11-2008, 02:14 AM   #28
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This is a lot of great information. Any chance of something similar for superchargers?
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Old 02-08-2008, 07:23 PM   #29
streetrcer909
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thanks for taking the time to make this thread im picking up my wrx tomorow and am learning a lot of new information about these cars.
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Old 02-18-2008, 03:12 AM   #30
racerpj
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I wonder what are the unabomber's thoughts on the "crack on VF39" debate. Is this a serious problem that lots of VF39's develop cracks, and will small cracks like those affect performance in holding boost?
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Old 02-18-2008, 05:16 PM   #31
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thank God for ya Unabomber.
after reading all your stuff i actually feel intelligent now. just one quick question, as i understand, the P&P can be done at a local machine shop, but the clipping, as im not familiar with, is this as common as the P&P? and is it advisable on the stock td04 (i think thats what it is, on my 06 wrx tr)?
thank you very much for sharing your time and knowledge!
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Old 03-04-2008, 04:04 PM   #32
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For a basic turbo upgrade how much am i looking at to spend on the componenets ill need to support the bigger turbo?
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Old 03-04-2008, 04:41 PM   #33
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Quote:
Originally Posted by racerpj View Post
I wonder what are the unabomber's thoughts on the "crack on VF39" debate. Is this a serious problem that lots of VF39's develop cracks, and will small cracks like those affect performance in holding boost?
I'm not Unabomber, but for what's it's worth I can tell you the vf-39 I took off my STI recently (with 95k miles on it) had 3 cracks. It also had no problem building boost (20psi) or holding it.
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Old 06-27-2008, 12:32 AM   #34
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THANK YOU. i now have a much better understanding of turbo's and what everything means.
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Old 06-30-2008, 01:59 AM   #35
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Quote:
Originally Posted by Unabomber View Post
Turbo FAQ

What is my stock turbo?

2002-2008 WRX TD04-13T
2004-2005 STI VF-39
2006-2007 STI VF-43
2008 STI VF-48
I thought the 2006 STi came with the VF39, not VF43?
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Old 09-08-2008, 11:52 AM   #36
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Could it be possible to add on a "When To Upgrade Your Fuel Pump/ Injectors" section on this?


I know I would like to know. I think it would be most beneficiary to the guys with wrxs who are looking to go with a vf series.
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Old 09-08-2008, 05:00 PM   #37
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Could we get this as a sticky?
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Old 09-08-2008, 05:11 PM   #38
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It's part of Unabomers faq which is stickied

http://forums.nasioc.com/forums/showthread.php?t=533787
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Old 09-21-2008, 10:00 PM   #39
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I read this but i still dont understand how i am suppose to use my turbo. I always thought if you put your foot on the throttle, the psi will go up, and when you let go, that when the boost kicks in. Thats why i thought its ok to throttle my car, psi builds to max, and let go of throttle, and then repeat. I think i am wrong, can someone tell me what is the proper way to use it or how it works? Iv read everything and searched online but still do not understand.

edit-nvm i understand now thanks.

Last edited by steakraw; 09-21-2008 at 10:08 PM.
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Old 10-15-2008, 09:06 PM   #40
SonicScooby27
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would it be ok to put a 18g in a stock '04 WRX ?

what supporting mods would i need to install with it to make it work ?

injectors, fuelpump, etc. ?
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Old 10-15-2008, 09:21 PM   #41
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Quote:
Originally Posted by SonicScooby27 View Post
would it be ok to put a 18g in a stock '04 WRX ?

what supporting mods would i need to install with it to make it work ?

injectors, fuelpump, etc. ?
No it would NOT be ok.

Injectors, fuel pump, engine management, up-pipe, downpipe, and a tune.
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Old 10-15-2008, 09:24 PM   #42
SonicScooby27
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Quote:
Originally Posted by Xigent View Post
No it would NOT be ok.

Injectors, fuel pump, engine management, up-pipe, downpipe, and a tune.
after those mods, then it would be ok to put it in?

and what size injectors would be good enough?
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Old 11-07-2008, 04:56 PM   #43
Tahoe SC
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hmm...so P&P stock turbo would require additional EM? interesting...
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Old 11-08-2008, 12:20 PM   #44
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Pointless unless it is a sticky... you should'nt have to do a SEARCH for a FAQ.
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Old 11-08-2008, 12:50 PM   #45
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Quote:
Originally Posted by Black_Ice View Post
Pointless unless it is a sticky... you should'nt have to do a SEARCH for a FAQ.
You know how i can tell you're new, besides your number rating.

http://forums.nasioc.com/forums/showthread.php?t=533787

Now look at the list

Turbo FAQ <--------all new content 3/10/2007
http://forums.nasioc.com/forums/show....php?t=1218459

Now apologize to Unabomber, you think he's an idiot or something?
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Old 11-17-2008, 05:18 PM   #46
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subscribed! great write up!!!
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Old 11-28-2008, 07:52 PM   #47
cheyWRX
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What is the 2009 WRX turbo?
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Old 11-29-2008, 08:26 AM   #48
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Vf-52
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Old 12-11-2008, 01:42 PM   #49
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awesome thread
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Old 01-14-2009, 01:15 AM   #50
3rdangle
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Default Inquiry Regarding Turbo Equivilent to VF-43, But w/ Compressor Map Available

I'm looking for some help identifying a turbo which is basically equivilent to the OEM VF-43, but which has a compressor map available online. I've reviewed the Turbo FAQ, but it is more orientated towards upgrades rather than OEM replacements. I'm attempting to perform a simulation on an '07 STI, and compare the results against DeltaDash data. Basically, I'm looking for a compressor map that is "close-enough".

Thanks in advance for any help!
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