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Old 01-15-2009, 03:11 AM   #1
subaru fan
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Default vf39??

right now iam stage 2 on cobb ap full turbo back

and on a stock turbo what are some modds i can put on my car before i get a protune to get the most horse power

so with out touching big engine internals

any words of advice thanks


and any possibles of porting and polishing my turbo out?
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Old 01-15-2009, 03:36 AM   #2
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you could port/polish..you can install 20g compressor wheel. you can install meth. there's really lots of stuff you can do, your question is way too vague
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Old 01-15-2009, 04:05 AM   #3
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Quote:
Originally Posted by VladiWrX View Post
you could port/polish..you can install 20g compressor wheel. you can install meth. there's really lots of stuff you can do, your question is way too vague
Meth inj.

intercooler

fuel pump

ewg
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Old 01-15-2009, 04:18 AM   #4
dan240
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wrong forum
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Old 01-15-2009, 08:18 AM   #5
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A front mount and a CAI will get you some more ponies when you go get a protune. Don't put the CAI on till the day of the protune. Other than that start saving for a 20g or one of the Blouch Dominators. Just my .02 cents.

http://www.blouchturbo.com/turbos/Su...minator_2.5R_/

http://www.blouchturbo.com/turbos/WR...Dominator_1.0/
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Old 01-15-2009, 01:56 PM   #6
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My vote goes to EWG. The IWG on my vf-43 seems to be doing a pretty crappy job at holding boost levels after getting pro-tuned. An EWG will flatten your torque and hp curve by allowing you to hold more boost as you get towards redline.

I also think you should look into a set of port-matched, ceramic coated manifold elbows. This will make your boost response almost immediate and if you want a bit more top-end you can pick up a cross pipe to go with them.

Injectors are also a good idea as most pro-tuned STI's get pretty close to maxing out the stock ones. If you plan on going with a larger turbo sooner than later and don't want to buy injectors twice (like myself) you can pick up a 255lph fuel pump to help lower IDC's for the mean time.
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Old 01-15-2009, 01:58 PM   #7
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turbo inlet-top mount-ewg-injectors-fuel pump-headers-pnp everything(grimmspeed) phenolic spacers-meth-water sprayer-gears! the list goes on and on
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Old 01-15-2009, 01:59 PM   #8
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I think some EL headers with a CAI and turbo inlet will really wake up that VF39.
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Old 01-15-2009, 01:59 PM   #9
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and a fuel pump wont really lower idc that is the job of the pressure regulator that you can mod for free to give you about 10 more psi
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Old 01-15-2009, 02:01 PM   #10
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EQUAL length headers.... about 10 WHP right there
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Old 01-15-2009, 02:20 PM   #11
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I vote for a PnP exhaust manifold and highflow x pipe combo

http://www.grimmspeed.com/catalog/pr...7ggmmh8pba2ls3

A nice up pipe is always a good addition as well!

http://www.grimmspeed.com/catalog/pr...7ggmmh8pba2ls3

Don't hesitate to ask us if you have any questions!!


Mike
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Old 01-15-2009, 08:20 PM   #12
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Quote:
Originally Posted by Chris_Lee View Post
A front mount and a CAI will get you some more ponies when you go get a protune. Don't put the CAI on till the day of the protune. Other than that start saving for a 20g or one of the Blouch Dominators. Just my .02 cents.

http://www.blouchturbo.com/turbos/Su...minator_2.5R_/

http://www.blouchturbo.com/turbos/WR...Dominator_1.0/

front mount is waste of money for the stock turbo

Quote:
Originally Posted by Steve.804 View Post
My vote goes to EWG. The IWG on my vf-43 seems to be doing a pretty crappy job at holding boost levels after getting pro-tuned. An EWG will flatten your torque and hp curve by allowing you to hold more boost as you get towards redline.
.
it all comes down to the tuner skills, and of course with right boost controller set up

EWG is not needed
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Old 01-15-2009, 10:14 PM   #13
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Ask your tuner.
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Old 01-15-2009, 10:41 PM   #14
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Quote:
Originally Posted by Chris_Lee View Post
A front mount and a CAI will get you some more ponies when you go get a protune. Don't put the CAI on till the day of the protune. Other than that start saving for a 20g or one of the Blouch Dominators. Just my .02 cents.

http://www.blouchturbo.com/turbos/Su...minator_2.5R_/

http://www.blouchturbo.com/turbos/WR...Dominator_1.0/
Agree'd FMIC is a waste.. if anything go with a big TMIC like APS or TurboXS.

Go with the APS 70mm off the bat, don't waste your money on a 65mm.
Quote:
Originally Posted by Steve.804 View Post
My vote goes to EWG. The IWG on my vf-43 seems to be doing a pretty crappy job at holding boost levels after getting pro-tuned. An EWG will flatten your torque and hp curve by allowing you to hold more boost as you get towards redline.

I also think you should look into a set of port-matched, ceramic coated manifold elbows. This will make your boost response almost immediate and if you want a bit more top-end you can pick up a cross pipe to go with them.

Injectors are also a good idea as most pro-tuned STI's get pretty close to maxing out the stock ones. If you plan on going with a larger turbo sooner than later and don't want to buy injectors twice (like myself) you can pick up a 255lph fuel pump to help lower IDC's for the mean time.
Tapering boost is the product of the stock turbo's exhaust side being too small, nothing to do with IWG. A MBC and/or 3port BCS will greatly help with boost control and spool-up.

I'd go with EL headers or even UEL before PnP the stock manifolds.

I'd definitely pick up bigger injectors and a fuel pump. The fuel pump will NOT lower IDC's. The stock injectors could easily be maxed out on an agressive Stage2 tune.
Quote:
Originally Posted by lowrider89 View Post
EQUAL length headers.... about 10 WHP right there
How'd you come up with that??
Quote:
Originally Posted by downsti View Post
front mount is waste of money for the stock turbo

it all comes down to the tuner skills, and of course with right boost controller set up

EWG is not needed
Listen to him^^ Haha.
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Old 01-16-2009, 09:44 AM   #15
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Quote:
Originally Posted by Shamoo View Post
Agree'd FMIC is a waste.. if anything go with a big TMIC like APS or TurboXS.

Go with the APS 70mm off the bat, don't waste your money on a 65mm.

Tapering boost is the product of the stock turbo's exhaust side being too small, nothing to do with IWG. A MBC and/or 3port BCS will greatly help with boost control and spool-up.

I'd go with EL headers or even UEL before PnP the stock manifolds.

I'd definitely pick up bigger injectors and a fuel pump. The fuel pump will NOT lower IDC's. The stock injectors could easily be maxed out on an agressive Stage2 tune.
How'd you come up with that??


Listen to him^^ Haha.
Quote:
Originally Posted by subaru fan View Post
right now iam stage 2 on cobb ap full turbo back

and on a stock turbo what are some modds i can put on my car before i get a protune to get the most horse power

so with out touching big engine internals

any words of advice thanks


and any possibles of porting and polishing my turbo out?
Quote:
Originally Posted by downsti View Post
front mount is waste of money for the stock turbo



it all comes down to the tuner skills, and of course with right boost controller set up

EWG is not needed
subaru fan asked....I can put on my car before i get a protune to get the most horse power.

These are simple bolt ons he can do.

He needs to talk to the tuner about which boost control solenoid he likes to use.

If he is going to get a costume tune, the tuner will be able to make the most out of a CAI and a fmic. Now if he was running a ots map or something there would be no benefit but with a tune he will see gains. The situation really is dictated by the tuners abilities and what he likes to tune. Definitely contact the guy that will be tuning your car and get some input from him.

Last edited by Chris_Lee; 01-16-2009 at 09:58 AM.
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Old 01-16-2009, 11:08 AM   #16
Steve.804
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Quote:
Tapering boost is the product of the stock turbo's exhaust side being too small, nothing to do with IWG. A MBC and/or 3port BCS will greatly help with boost control and spool-up.

I'd go with EL headers or even UEL before PnP the stock manifolds.

I'd definitely pick up bigger injectors and a fuel pump. The fuel pump will NOT lower IDC's. The stock injectors could easily be maxed out on an agressive Stage2 tune.
My wastegate is simply not holding the boost pressures at upper RPM's. No tuner can tune around a faulty mechanical device. You could add a helper spring but if you havnt gotten tuned yet and have some extra cash to spend I'd just go with an EWG and reek the benefits.

Why would you not want PnP stock manifolds? I've seen nothing but great results with these (my own car being one of them) and compared to the price of aftermarket header's they're a deal. Plus you dont have to worry about crappy welds cracking.

I stand corrected on the fuel pump. I always figured the higher flowing pump helped with IDC's not sure where I picked up on that...
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Old 01-16-2009, 12:00 PM   #17
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Quote:
Originally Posted by Chris_Lee View Post
subaru fan asked....I can put on my car before i get a protune to get the most horse power.

These are simple bolt ons he can do.

He needs to talk to the tuner about which boost control solenoid he likes to use.

If he is going to get a costume tune, the tuner will be able to make the most out of a CAI and a fmic. Now if he was running a ots map or something there would be no benefit but with a tune he will see gains. The situation really is dictated by the tuners abilities and what he likes to tune. Definitely contact the guy that will be tuning your car and get some input from him.
Yes definitely talk to your tuner about what they like and feel comfortable with doing. A FMIC on the stock turbo is just not worth it, I know of alot of tuning headaches that come along with that.. screwy MAFv, rich dips in the AFR when the MAF has registered the extra air but it hasn't gotten through the whole IC setup up yet.. just too many problems with FMIC on the stock turbo. The stock STi TMIC works just fine but if he wanted to upgrade, I'd go with either the APS or TurboXS TMIC.

Quote:
Originally Posted by Steve.804 View Post
My wastegate is simply not holding the boost pressures at upper RPM's. No tuner can tune around a faulty mechanical device. You could add a helper spring but if you havnt gotten tuned yet and have some extra cash to spend I'd just go with an EWG and reek the benefits.

Why would you not want PnP stock manifolds? I've seen nothing but great results with these (my own car being one of them) and compared to the price of aftermarket header's they're a deal. Plus you dont have to worry about crappy welds cracking.

I stand corrected on the fuel pump. I always figured the higher flowing pump helped with IDC's not sure where I picked up on that...
Nothing will help with your boost tapering off in the upper RPM's.. that's what the stock turbo does. The exhaust side is just too small to hold boost steady. Rigging up helper springs may work but your just putting the turbo out of its efficiency range and overworking it. Tapering boost is not a bad thing though if you know how to tune with it.

Like I said I would go equal length header before PnP manifolds. And if you don't buy a crappy header you won't hav crappy welds.. I haven't heard of anyone having cracking issues lately. There is a reason the JDM versions come with an equal length manifold .
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Old 01-16-2009, 12:26 PM   #18
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Quote:
Nothing will help with your boost tapering off in the upper RPM's.. that's what the stock turbo does. The exhaust side is just too small to hold boost steady. Rigging up helper springs may work but your just putting the turbo out of its efficiency range and overworking it. Tapering boost is not a bad thing though if you know how to tune with it.
I did a lot of research on other people's pro-tuned results and it's not the numbers my car made as much as it is the shape of the graph. The car falls on it's face more than a typical Stage 2 protuned STI. It's the wastegate that is keeping me from making boost in the upper rpm's. You can hear the flutter coming from it right when boost comes on hard. Sounds like the flapper can't stay shut. Anyway I dont wanna derail this thread with my own car. If you want to check it out Shamoo I'd appreciate your feedback: My Pro-tuned results
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Old 01-17-2009, 01:50 AM   #19
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wat is a good brand ewg to get and do i need a new uppipe with the ewg
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Old 01-17-2009, 01:51 AM   #20
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all soo wats a good place to pp my turbo and is it possible to put a 20g part on my vf39?
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