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Old 01-28-2007, 01:41 PM   #1
wrx2k4blue
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Default Looking to upgrade to VF34

I'm looking to give my 2004 WRX some more life. This is my daily driver however, so I don't want to go overboard, so I figure the VF34 would be perfect.

Currently, I'm running Cobb Accessport Stage 2 with a stromung 'shorty' downpipe and an SPT catback. I plan on getting an up-pipe, bigger TMIC (haven't decided which one...maybe a cheap ebay TMIC), STi pinks, and a Walbro fuel pump.

Can someone tell me if it'd be mandatory to get any of the following? boost controller, turbo timer, boost gauge, EGT gauge, BOV. I know some of these would be helpful, but if I plan on using the AP to flash the ECU with the VF34 map, are any of these necessary?

I don't race, drag, etc. but I do perform some spirited driving from time to time. Nothing too aggressive. Just looking for a good way to give my car some more pep. I don't think an up-pipe or TMIC are enough pep, but anything larger than a VF34 would be too much.

Suggestions and comments welcome, thanks!
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Old 01-28-2007, 01:45 PM   #2
anthony_delprete84
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im sure most people are going to tell you to not even waste ur time. That turbo is alittle over priced new and used for what u are getting. Might as well go 16g. Im sure that will hold u down for alot longer than the 34. Bc u know once u go 34 u will want more. Even a vf22 would be a better bet in my opinion for you.
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Old 01-28-2007, 01:48 PM   #3
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Quote:
Originally Posted by anthony_delprete84 View Post
im sure most people are going to tell you to not even waste ur time. That turbo is alittle over priced new and used for what u are getting. Might as well go 16g. Im sure that will hold u down for alot longer than the 34. Bc u know once u go 34 u will want more. Even a vf22 would be a better bet in my opinion for you.
Yea skip the VF turbos.Go get one of the G seires turbo (16,big16g,evoIII16g)
Take it from someone who had a VF34.Go big now!You won't look back
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Old 01-28-2007, 02:23 PM   #4
wrx2k4blue
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Obviously if I go with anything other than a VF30 or VF34, I would need to get a custom tune since the AP does not have maps for anything other than those 2 turbos. If I sold my AP for anywhere from $400-$500 would that pretty much pay for a custom tune? I think someone has said a custom tune is usually around 5 bills.

I fear that if I get a G turbo, my car won't drive like a daily driver anymore. Any truth to this? Of course I'm expecting some people out there that use their G turbocharged cars as daily drivers but in my opinion, I don't think it should be used as a daily driver.

I'm already getting pretty poor gas mileage (18 mpg - but it's winter time) and because I have such a short commute to work, worse gas mileage would just be painful. I can't imagine getting fair gas mileage with a G series turbo and a custom tune...but I could be wrong?
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Old 01-28-2007, 02:38 PM   #5
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1. You can still keep the AP and get a custom tune for the G series. The tuner should give you a map to make it to their shop.

2. I don`t know where you get all this wrong info but you need to do a bit more search regarding to the daily driver comment since theres no grounds for that. Theres people with GT35Rs and GT40 on their DDs with no problems.

3. Why do you think you would get better gas mileage with the VF series? Whoever told you He`s an idiot. And if you`re worrying about gas mileage might as well just have picked up a Civic Hybrid.
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Old 01-28-2007, 03:47 PM   #6
Grover85
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If you really want a vf turbo save money and just buy a used 39 then. It maybe wont be the same power level as a 34 but it will be close.
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Old 01-28-2007, 04:17 PM   #7
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Quote:
Originally Posted by wrx2k4blue View Post
Can someone tell me if it'd be mandatory to get any of the following? boost controller no, turbo timer no, boost gauge no but Yes good to have it, EGT gauge again same situation (monitoring purpose Yes, BOV no.
Good luck on your set up. You'll have lots of fun with it.

Peace
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Old 01-28-2007, 05:27 PM   #8
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Quote:
Originally Posted by wrx2k4blue View Post
Obviously if I go with anything other than a VF30 or VF34, I would need to get a custom tune since the AP does not have maps for anything other than those 2 turbos.
Go check out the new map...there is a AP OTS map for the fp16g turbo now for the 2004wrx. I'm in the same boat as you and I may get the 16g over the vf34
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Old 01-28-2007, 06:24 PM   #9
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I am in the same boat, currently AP stage 2 with perrin uppipe and cobb catted dp. The WRX is my daily driver. I would like to upgrade turbo with either VF34 or 16g. So I can use the OTS maps. Many people has good comment about VF34 map, what about the 16G map? Anybody try it?
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Old 01-28-2007, 06:40 PM   #10
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Several of my friends have 16gs and I have raced them and on 91 pump they arent much quicker than my 39. Those turbos can spin to 23-24 on race gas but if your not into that then vf series are fine for street setup. Buy used and you be happy with the dollar per horse power gain. I even ran a stock intercooler for a while and it ran great. Dont skimp on custom tunes. Cobb OTS maps arent that great and youll be happier knowing that your setup has reached its full potential.

Last edited by AWDWRXLOVER; 01-28-2007 at 07:04 PM.
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Old 01-28-2007, 07:14 PM   #11
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Quote:
Originally Posted by chuckml97 View Post
I am in the same boat, currently AP stage 2 with perrin uppipe and cobb catted dp. The WRX is my daily driver. I would like to upgrade turbo with either VF34 or 16g. So I can use the OTS maps. Many people has good comment about VF34 map, what about the 16G map? Anybody try it?
An OTS map should be a temporary solution to any aftermarket turbo. Ultimately a custom tune should be the order of the day.
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Old 01-28-2007, 08:25 PM   #12
wrxvette009
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I just bought an 02, it came with a 39 and I installed it. It was nice I like it but I see myself already wanting more. Might be better just to go big the first time around.

I am new to the Subaru family but I love them.
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Old 01-28-2007, 11:52 PM   #13
scooby1220
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I have a VF34 and all the Cobb OTS requirements and stock TMIC. It's a little more laggy (200-300rpms) than the stock turbo. Power beyond that point shows a major difference. Overall I am happy with it. I don't want anymore, I do 64 miles a day minimal x 5 days a week. Gas mileage stayed about the same as stage 2. I think you'd be happy with the VF34, but from what I hear the 16G is another possibility to look into. I didn't get it b/c Cobb didn't have an OTS map for it on the '04's, even if they did I don't know if I would've gotten a 16G or not.

By the "not wanting anymore comment" I strictly meant not wanting a bigger turbo, but a larger TMIC, turbo inlet, protune etc. are in the works for the spring.
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Old 01-29-2007, 12:02 AM   #14
bren wrx
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18g 8cm, ebay tmic, tune, and DW injectors......dont waste time like i did
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Old 02-01-2007, 12:27 PM   #15
maxpower_454
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Quote:
Originally Posted by scooby1220 View Post
I have a VF34 and all the Cobb OTS requirements and stock TMIC. It's a little more laggy (200-300rpms) than the stock turbo. Power beyond that point shows a major difference. Overall I am happy with it. I don't want anymore, I do 64 miles a day minimal x 5 days a week. Gas mileage stayed about the same as stage 2. I think you'd be happy with the VF34, but from what I hear the 16G is another possibility to look into. I didn't get it b/c Cobb didn't have an OTS map for it on the '04's, even if they did I don't know if I would've gotten a 16G or not.

By the "not wanting anymore comment" I strictly meant not wanting a bigger turbo, but a larger TMIC, turbo inlet, protune etc. are in the works for the spring.
Do you have a catless up pipe? If so, do you mean it is about 200-300 rpm more laggy than stock turbo with or without a catless uppipe. I've been reading for a while on here and I've heard reports of 500rpm less lag once a catless up is put on with the stock turbo and that the vf34 is about 500 rpm more laggy than stock. Does this mean that if I put a catless up on at the same time I do the vf-34 upgrade the lag will stay about the same as stock??
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Old 02-01-2007, 12:49 PM   #16
kilowhisky
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Are they both direct bolt ons?
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Old 02-01-2007, 01:42 PM   #17
wrx2k4blue
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Quote:
Originally Posted by maxpower_454 View Post
Do you have a catless up pipe? If so, do you mean it is about 200-300 rpm more laggy than stock turbo with or without a catless uppipe. I've been reading for a while on here and I've heard reports of 500rpm less lag once a catless up is put on with the stock turbo and that the vf34 is about 500 rpm more laggy than stock. Does this mean that if I put a catless up on at the same time I do the vf-34 upgrade the lag will stay about the same as stock??
I'll be installing an ERZ uppipe at the same time the VF34 goes on. I'm hoping it keeps the lagginess to a minimum but I'm expecting it to be slightly worse than stock.

From what some people have said, this may actually help with gas mileage since you boost a little later. It makes city driving better for gas. I have a 10 minute commute to work, no highways so this is perfect for me.
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Old 02-01-2007, 02:15 PM   #18
maxpower_454
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Quote:
Originally Posted by wrx2k4blue View Post
I'll be installing an ERZ uppipe at the same time the VF34 goes on. I'm hoping it keeps the lagginess to a minimum but I'm expecting it to be slightly worse than stock.

From what some people have said, this may actually help with gas mileage since you boost a little later. It makes city driving better for gas. I have a 10 minute commute to work, no highways so this is perfect for me.
I'm still trying to track down parts for my vf34 swap so when you get yours in and try it out let me know how you like it
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Old 02-01-2007, 02:22 PM   #19
jfloyd09
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I have a VF34 and I love it. Bought it used (3,000 miles from a guy on this site who wanted a 16g ) and sent it to deadbolt to have it ported, polished, and ceramic coated(did this locally). Total cost was still less than a new one. STill kicking ass after 35,000 miles. Porting helps a LOT with lag. What ever you decide to get make the uppipe an priority. Helps with lag immensly.

Hope this helps
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Old 02-01-2007, 02:27 PM   #20
wrx2k4blue
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My mod list when it's all said and done:

VF34
STi 565 cc injectors
Walbro Fuel pump
ERZ flex uppipe
SSAC TMIC
Stromung shorty DP
SPT Catback Exhaust
Cobb Accessport VF34 Map

Trust me, once everything is in and I drive it a few times, the first thing I do when I get home is posting on here
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Old 02-01-2007, 03:53 PM   #21
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If you want to see what Cobb's VF34 map is capable of watch some of my videos....

http://www.youtube.com/watch?v=0bmIXozeRuA

Yes that track is redneck but that's what you get for living in Arkansas. I'm happy with the VF34 although I do wish it had more topend. I'm just tired of spending money on this crap, so I'm not changing out the turbo again. I may go for a rebuilt motor if I still have this car in a year or two.
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Old 02-01-2007, 03:56 PM   #22
wrx2k4blue
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1/8 mi track? Nice! Your car sounds awesome. Mod list?

Oh and WRX FTW!
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Old 02-01-2007, 04:41 PM   #23
sti25impreza
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if you look at the map notes from cobbs website they clearly get way more power out of the vf34. the fp16g is only a little more power than a stage 2 flash. havent done any research on turbos yet but if the 16g is bigger/better, what gives?

fp16g
vf34
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Old 02-01-2007, 06:09 PM   #24
trd6209
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I believe that the FP is not the Big 16G if you look at their website it shows that this is only rated at 510 CFM while the big 16 is 550 CFM and the EVO III 16G is 575 CFM. This is why I am going with a VF39 myself. Much cheaper than a VF34, a lot easier to find used for a fair price (I got mine for $350 with low miles, no cracks or shaft play) and the Cobb VF34 map will work on it. If you throw a big 16G on and use the FP16G map from Cobb's website I bet you will be looking to get a protune immediately. That was my logic in going with the VF39. Just my 2 cents...

Quote:
Originally Posted by sti25impreza View Post
if you look at the map notes from cobbs website they clearly get way more power out of the vf34. the fp16g is only a little more power than a stage 2 flash. havent done any research on turbos yet but if the 16g is bigger/better, what gives?

fp16g
vf34
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Old 02-01-2007, 06:52 PM   #25
jikhead
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Quote:
Originally Posted by wrx2k4blue View Post
1/8 mi track? Nice! Your car sounds awesome. Mod list?

Oh and WRX FTW!
Best 1/8th is 8.2 last summer when I switched to some used Michelin Pilot Sports. Of course that track is downhill and then uphill.
Best 1000ft is 10.5 at 97mph on P Zero Nero M+S tires a couple of years ago. Haven't been back to that track with the Pilot Sports.
I left my 3rd cat on last summer because I didn't feel like crawling underneath the car that year, and noticed that it didn't make any difference in my times.

Cobb 2.5 VF34 flash
VF 34
STI injectors
Walbro fuel pump
CO2 IC sprayer
couple of catch cans
Denso plugs
Group N top hats, engine and tranny mounts
Cobb shifter bushing w/ STI short shifter
Adjustable Koni's with Eibach springs
Stock brakes with Stoptech rotors and steel lines
OZ Superleggeras
Vishnu uppipe, Bosal downpipe and catback, Kartboy hangers
Whiteline steering rack bushing
Samco IC hoses
stock intake w/KN filter
That's pretty much it.
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