Maximize 09 wrx turbo, next steps?

[HellTriX]

So the TMIC is done and so is the downpipe.

I've finally decided on my current goal is to maximize the output
I can get from the stock 09 WRX turbo.

The downpipe/tmic had done well to improve power but also increased
the boost taper effect at 5000+rpm. I would like to remove some of this
boost tapering and get the most out of the stock turbo without pushing
the turbo beyond its safe limits.

The things to achieve this are for sure a fuel pump upgrade. I have had
mixed opinions on injectors so I would like more input on this. For instance
if I should upgrade injectors, what size do I get? Can anyone post/email
me links to a vendor I can pick these up from?

This leads me to a question regarding the boost control solenoid. If I do
injectors + fuel pump, do I require a new EBSC?

My protune date is coming up and I am hoping to get the rest of these
mods done so I can have just a single protune to get the most out of
my turbo since this is how it will remain for a while.

tnx

[booosted09]

Check out boost addicts thread. His 08 is using our turbo. He has all the info you'll need.

[RcrsWetDream]

Pretty much the std.

Deatschwerks

Also use this tool to size them.. If you want to max the VF52, which is around 320 then you'll probably want 750cc.

Deatschwerks

I've had mixed feelings about upgrading my injectors... I was told by the guys at cobb that I don't need to at my elevation and crappy fuel area (I live in Utah). If you're at a lower elevation and can tune for 93 octane it seems to be necessary.

[HellTriX]

Originally Posted by booosted09

Check out boost addicts thread. His 08 is using our turbo. He has all the info you'll need.

Oh thanks, I didn't realize he had the same turbo as the 09s currently. The latest stuff I read on his post was the new turbo he was trying to decide over getting. His mod list was pretty extensive too though so I may have written it off to quick to use as a sort of example.

[HellTriX]

Originally Posted by RcrsWetDream

Pretty much the std.

I've had mixed feelings about upgrading my injectors... I was told by the guys at cobb that I don't need to at my elevation and crappy fuel area (I live in Utah). If you're at a lower elevation and can tune for 93 octane it seems to be necessary.

Thanks for this. I live at pretty much sea level, not even 300ft on average. But the best gas we have around he is 92 octane.

The calculator is telling me around 560cc at 90% assuming 320whp or 700cc assuming 400hp crank. So guess it seems I would probably need a 650 or 700cc for 320whp/400crank?
I'm making the assumption that the calculator is going by crank hp.


mmk tnx

[newtothegame]

Get bigger than what you think you need, just for the head room, or even in case you decide later on to go for more power. DW injectors are amazing. Im running 850cc with 326AWHP, car still drives like stock.

[booosted09]

Originally Posted by newtothegame

Get bigger than what you think you need, just for the head room, or even in case you decide later on to go for more power. DW injectors are amazing. Im running 850cc with 326AWHP, car still drives like stock.

lucky....

[Boost Addict]

750cc is more than sufficient for the vf52. Last time we checked injector duty cycles were in the 60% range. On the bigger turbo, I'm keeping the 750ccs.

I would also upgrade the fuel pump to the walbro 255lph to future proof yourself.

The Perrin equal length header is a pretty awesome piece of work if you are okay with the sound change. Your spool up will be significantly quicker and your mid-range punch will be tremendous! Unfortunately there isn't much you can do to alleviate the tapering/plateauing effect of the VF52 in the upper rpm range. It's simply unable to push enough air to continue making power.

[2009MoneyPit]

I would second Boost's suggestion to the header. It's easy to do, it does give you a nice kick in the pants. the biggest downside is the different exhaust note...

Also what about an intake(if you don't have one already)? Since you are getting it tuned..

[HellTriX]

Originally Posted by 2009MoneyPit

I would second Boost's suggestion to the header. It's easy to do, it does give you a nice kick in the pants. the biggest downside is the different exhaust note...

Also what about an intake(if you don't have one already)? Since you are getting it tuned..

Was told and read in other places that the 2009 wrx intake is good for 350whp and to not worry about upgrading it unless I go past that. Information suggests I'm going to peak at 330-340whp on the turbo anyway so a 5-7hp gains from an intake isn't really worth the money for my goals I'm thinking?

And as far as the exhaust, No matter what I do, I can't do headers. To me the iconic scooby sound is just irreplaceable at any power level I'd put NO_2 on the car before I'd consider replacing headers

[newtothegame]

I dont know if they are working on it (for the 08+). But have heard great things about grimmspeed and their PnP'd manifold(s) and crossover pipe. It allows you to keep the subie sound, but also increases effeciency of the parts. Just something to think about or look into also.