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Old 03-15-2009, 12:59 AM   #1
guru_method
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Question Should I swap VF39 for the VF48 on 03?

My 2.0L 03 wrx has been running a VF39 for about three years now, last year i had it ported and polished by Grimmspeed, and hooked up some DW 740cc injectors. I'm running it on an external wastegate, and the last dyno sesh hit 321 whp, 317 tq on 93 with old spark plugs and a bad coil, as i later found out, but I wouldn't expect much more hp.

As of lately the car is running descent but i don't feel the pulling like back in the day. I want to upgrade the turbo but don't want to risk breaking the engine, since it has stock internals, or my RA transmission, and really prefer to stay small turbo. So the range of 360 whp would be the limit for me, I believe.

I was thinking of going VF48, since people are putting out good numbers on them and the turbo will of course be fresh and new.

DO YOU THINK IT'S WORTH IT?

The car also has:
Manifold
UpPipe
Downpipe
Full 3"
Big TMIC
255 lph pump
CAIntake
Denso IK24 plugs
UTEC
Greddy Profec B sII EBC

Good opinions appreciated. Thanks!
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Last edited by guru_method; 03-17-2009 at 10:35 PM.
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Old 03-15-2009, 01:10 AM   #2
Tgui
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I ran the same boost on a 60K mile VF39. The 48 isn't the godsend so many people think it is, same size as the 39.

Go a 16/18G if you want something different.
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Old 03-15-2009, 01:16 AM   #3
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Quote:
Originally Posted by Tgui View Post
I ran the same boost on a 60K mile VF39. The 48 isn't the godsend so many people think it is, same size as the 39.

Go a 16/18G if you want something different.
Some people have different opinions on what the stock internal 2.0 can hold. It obviously depends on a variety of factors. Do you think my car, just the way it is, will hold the power of an 18g? Say that it is tuned conservatively with 11.2 afr if it helps, running under normal conditions (the daily street race and whatnot, you know, normal).
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Old 03-15-2009, 05:53 PM   #4
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your car can handle an 18g but if you don't want to go much bigger i'd do an evo III 16g, just my 2 cents
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Old 03-15-2009, 09:48 PM   #5
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I'm lovin the 18g idea... especially since i saw this: http://store.forcedperformance.net/m...Code=WRX-Turbo
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Old 03-15-2009, 11:21 PM   #6
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Originally Posted by guru_method View Post
I'm lovin the 18g idea... especially since i saw this: http://store.forcedperformance.net/m...Code=WRX-Turbo
that would be awesome. go for it!!
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Old 03-16-2009, 12:09 PM   #7
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I've got a pnpnc'd 18G on my stock 2.0L with EWG and love it. Honestly I think a 18G is a good upgrade for 2.0L and that is a good price. I say go for it also.
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Old 03-16-2009, 10:19 PM   #8
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Originally Posted by 03EJ20 View Post
I've got a pnpnc'd 18G on my stock 2.0L with EWG and love it. Honestly I think a 18G is a good upgrade for 2.0L and that is a good price. I say go for it also.
Can not argue with the price. I think that would be the best direction for you. Will get you some big power numbers!
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Old 03-16-2009, 10:24 PM   #9
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You will make no more power with a VF48 than a VF39. Any power difference would be WELL within the margin of error under the best case scenario, you're just wasting time and money. If you want to go with something better, I'd go to at LEAST an 18G. It will spool as quickly as your VF39 but make more power from 3500ish on up, and while peak numbers won't be drastically different, you'll have buttloads more top-end, and a turbo that's happy at high boost if you ever go with meth or race gas.
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Old 03-17-2009, 10:37 PM   #10
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Sounds real good...

I also have the opportunity of buying a low mileage, great condish PE1818. What do you guys thing of that idea?
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Old 03-18-2009, 02:35 PM   #11
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Hoefully I will get my car back from retune this weekend and I can post up my redone #'s. The reason for my retune was going from opensource to standalone. From what my tuner told me, the car holds 22psi all the way up to about 6700 rpm.
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Old 05-04-2009, 01:25 PM   #12
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Default About to install a VF48 - can I run a COBB VF39 map??????

Dood's, I'll keep this short.... but I truly need some solid advice.

I'm about to acquire a 2009 Sti (VF48) turbo, TMIC, and injectors for US$550.
Crazy deal!

Planning on installing it on my 2005 WRX (currently running stage 2).

Can I get away with loading up the following COBB map of their website:
VF39 turbo, STi TMIC, STi "Pink" 565cc injectors & Turboback exhaust using 91 octane. 341HP (+50%) / 289 lb-ft (+33%)

I know I know... I should get it tuned... but I'm on a serious budget and know the COBB maps are conservative. Also, the VF39 and VF48 are nearly the same. Also, the stock 2009 STi injectors flow 565cc (they're also top feed - which works on the WRX's 02-09).

Really appreciate any help here folks.
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Old 05-04-2009, 02:18 PM   #13
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Quote:
Originally Posted by Michael_Lobodzinski View Post
Dood's, I'll keep this short.... but I truly need some solid advice.

I'm about to acquire a 2009 Sti (VF48) turbo, TMIC, and injectors for US$550.
Crazy deal!

Planning on installing it on my 2005 WRX (currently running stage 2).

Can I get away with loading up the following COBB map of their website:
VF39 turbo, STi TMIC, STi "Pink" 565cc injectors & Turboback exhaust using 91 octane. 341HP (+50%) / 289 lb-ft (+33%)

I know I know... I should get it tuned... but I'm on a serious budget and know the COBB maps are conservative. Also, the VF39 and VF48 are nearly the same. Also, the stock 2009 STi injectors flow 565cc (they're also top feed - which works on the WRX's 02-09).

Really appreciate any help here folks.
Could you get away with it? possibly, but why risk it? Just buy it now and install it when you can afford a tune.
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Old 05-04-2009, 02:22 PM   #14
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Quote:
Originally Posted by zulater View Post
Could you get away with it? possibly, but why risk it? Just buy it now and install it when you can afford a tune.
Very true but almost everyone is saying the VF39 and VF48 are nearly identical.

So what's the difference - better flow dynamics in the VF48?!

Which would lead me to believe it would require more fuel - correct?


.... I guess I could "limp" over to the tuner using the VF39 map
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Old 05-04-2009, 03:40 PM   #15
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Quote:
Originally Posted by Michael_Lobodzinski View Post
Very true but almost everyone is saying the VF39 and VF48 are nearly identical.

So what's the difference - better flow dynamics in the VF48?!

Which would lead me to believe it would require more fuel - correct?


.... I guess I could "limp" over to the tuner using the VF39 map
Key word is "nearly". They *should* be close enough that the ecu *might* be able to adjust but imho not worth the chance that they might not be close enough. Yeah you could limp to the tuner on the 39 map if you keep it out of boost but I wouldn't run that map until you can afford a tune.
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Old 05-04-2009, 03:48 PM   #16
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Originally Posted by zulater View Post
Key word is "nearly". They *should* be close enough that the ecu *might* be able to adjust but imho not worth the chance that they might not be close enough. Yeah you could limp to the tuner on the 39 map if you keep it out of boost but I wouldn't run that map until you can afford a tune.
Success!!!!

I just found out about Clark Tuning.



Quote:
Originally Posted by thisisthenewsic View Post
I recommend paying 150$ for a clark turner mail map
you give him your mods and what vehicle......pay him the 150$
he will email you a base map to download.......
download it onto your accessport and it datalogs it
send him the map back and he will make adjustments as needed(all included in the 150$ you pay up front)
he will keep making changes til the car is running right

he does amazing work

if not
get a protune
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Old 05-04-2009, 03:52 PM   #17
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sell the ap for 350... get a protune for 450 with opensource... profit!
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Old 05-04-2009, 04:20 PM   #18
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sell the ap for 350... get a protune for 450 with opensource... profit!
with a Tacktrix(SP?) cable?
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Old 05-05-2009, 09:54 AM   #19
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Originally Posted by Michael_Lobodzinski View Post
with a Tacktrix(SP?) cable?
Yes, but before you decide to go this route, select and speak with your tuner first.

I was going to do this a little over a year ago, but I found out that the tuner I was using really preferred working with the AP and Cobb Protuner program. If I had gone the opensource route, most of the money I saved upfront would have been spent in extra dyno time. I ended up just buying a used Accessport and going from there.

I'm not saying opensource is a bad idea, but finding a tuner first and double checking with their preferences could save you both a lot of headache.

(Opensource might also be a bad idea because, if you are like me, there is a good chance that you'll eventually get out a laptop and start screwing with stuff. Perhaps you have have more control over your personal demons than I do.)
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Old 05-05-2009, 01:48 PM   #20
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(Opensource might also be a bad idea because, if you are like me, there is a good chance that you'll eventually get out a laptop and start screwing with stuff.
Whats so bad about this, Just dont make any drastic changes and keep a copy of your map thats untouched just incase you do mess up you can just revert back.
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Old 05-05-2009, 01:57 PM   #21
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Whats so bad about this, Just dont make any drastic changes and keep a copy of your map thats untouched just incase you do mess up you can just revert back.
Nothing, really- it might even be a good thing. If you're as obsessive compulsive as I am, though, it is just one other thing to eat up time and worry about.
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Old 05-05-2009, 06:12 PM   #22
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Go with the evolll big 16G thats what im doing
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Old 07-31-2010, 01:32 PM   #23
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Originally Posted by Audiosavvy View Post
You will make no more power with a VF48 than a VF39. Any power difference would be WELL within the margin of error under the best case scenario, you're just wasting time and money. If you want to go with something better, I'd go to at LEAST an 18G. It will spool as quickly as your VF39 but make more power from 3500ish on up, and while peak numbers won't be drastically different, you'll have buttloads more top-end, and a turbo that's happy at high boost if you ever go with meth or race gas.
^THIS, PERIOD. The big evoIII is awesome, but when he already has a vf39 and wants more, 18G is probably best.
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Old 07-31-2010, 01:52 PM   #24
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I am currently on a vf39 and I am switching with a t3t4 50trim which is FP Green big. Each person has a different thought pattern for the word big. If you want a nice bit more power than your vf39, go with a evo3 16G or 18G, if you can deal with a considerable amount of more lag and want crazy power (of course with the right supporting mods) go with either 20G, FP Green, SZ55 or equivalent
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Old 07-31-2010, 02:28 PM   #25
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^THIS, PERIOD. The big evoIII is awesome, but when he already has a vf39 and wants more, 18G is probably best.
Newb, dont try to pad your post count by bringing up old ass threads.
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