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Old 12-08-2004, 09:16 PM   #1
phenemwrx
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Default 2004 WRX STi VF39 turbo on 2004 WRX?

My WRX is currently at Cobb Stage 2 with TMIC. I have an opportunity to swap out my stock turbo with a stock turbo out of a 2004 STi.

Can this be done without any issues?
I am assuming the stock turbo is a vf39? Correct?
Will i also need STi injectors and larger fuel pump?
Can i just swap fuel pumps as well?


Any help would be appreciated!

Thanks,
~Zach
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Old 12-08-2004, 10:07 PM   #2
Unabomber
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You will need:

Sti injectors
Fuel pump
Different engine management
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Old 12-08-2004, 10:14 PM   #3
VideoGameWrx
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Quote:
Originally Posted by phenemwrx
I have an opportunity to swap out my stock turbo with a stock turbo out of a 2004 STi.
I hope you dont mean "trade" turbos with the STi! That would suck for him.
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Old 12-08-2004, 10:32 PM   #4
phenemwrx
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Quote:
Originally Posted by Unabomber
You will need:

Sti injectors
Fuel pump
Different engine management
Couldn't i just use the VF34 map from cobb? Also modify my stock WRX injectors like many others have done? Finally just swap out fuel pumps from an STi?

~Zach
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Old 12-08-2004, 11:07 PM   #5
MikeWRX-NJ
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the cobb map is made for a vf30/34. the vf39 is *close* to a vf34 but it still has different flow properties. X boost from one won't equal X boost on another.

modified stock WRX injectors flow much more than STi pink injectors. you will be rich with the cobb map.

STis owners swap their fuel pumps to walbro, why would you sway in an STi pump?
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Old 12-08-2004, 11:26 PM   #6
SubieStyle
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You'll want to get of STi "pink" in injectors. Also t w/ those you'll want to get a walbro pump. You can actually max out the stock STi pump before the injectors will max out.
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Old 12-08-2004, 11:29 PM   #7
phenemwrx
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ok guys thanks a bunch, looks like i have to wait until cobb releases there accesstuner!

~Zach
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Old 12-09-2004, 01:15 AM   #8
InfamousDX
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For the price of the upgrade to the Tuner compared to the power you'd get, it would probably be more economically efficient to just buy a vf30/34... they would make more power anyway.
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Old 12-09-2004, 09:52 AM   #9
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two threads over there was speculation that there IS a vf-39 accessport 2.5 map
you won't need a fuel pump for the stage 2.5 but its a good idea any way (2.5 is tuned for the stock fuel pump)
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Old 12-09-2004, 10:44 AM   #10
phenemwrx
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Quote:
Originally Posted by Jaxx
two threads over there was speculation that there IS a vf-39 accessport 2.5 map
you won't need a fuel pump for the stage 2.5 but its a good idea any way (2.5 is tuned for the stock fuel pump)
I am not sure i understand what you are saying here, is there a map made for the 2004 WRX that supports a vf39 upgrade?

~Zach
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Old 12-09-2004, 11:45 AM   #11
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He is saying that someone else's post speculated that Cobb has a VF-39 map. According to their website they don't. Call them directly and post what they have to say for others.
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Old 01-25-2005, 04:21 PM   #12
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I emailed them and they told me that there is no map and they don't plan on making one available.
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Old 01-26-2005, 06:51 AM   #13
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Quote:
Originally Posted by InfamousDX
For the price of the upgrade to the Tuner compared to the power you'd get, it would probably be more economically efficient to just buy a vf30/34... they would make more power anyway.
This is true but you know most of us AP people are going to get the Tuner anyway.
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Old 01-26-2005, 10:22 AM   #14
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Several people are running the vf-39 on the vf-34 map without consequence. If anything you "might" be alittle rich. Same compressor side, however, some vf-39's have a smaller hot side(p17 rather then a p18)...so your choice.
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Old 01-26-2005, 10:44 AM   #15
ride5000
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i agree with swine. though i don't have any cobb stuff, the turbos are very very similar. the only issues i could see arising are with the stability and control of boost levels.
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Old 01-26-2005, 11:05 AM   #16
Rickyh
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I have a vf39 and with all supporting mods and I tried the utec stage 4 map and it would knock a bit at around 5.5k. My vf39 has the p17 hot side.
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