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Old 10-06-2018, 03:35 AM   #1
WRX_mattb
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Question 2012 STi build

So a few weeks ago my engine developed rod knock. Bummer! By some sort of luck it happened on the same day that I bought a new DD (2007 Honda CR-V). My initial intentions were to retire the STi from daily driving duties and getting it ready for autox. Was going to do wheels, coilovers, sway bars, tires, etc over the winter. Well now obviously my plans have changed and a build is in the future first instead.

I live in Maryland and have been going to IAG for years and my STi recently got a decent amount of work done there as well as a tune from JR. So first and foremost, the heart of this build will be one of their short blocks. I have been talking back and fourth with IAG over the past couple weeks talking details and goals. Currently awaiting an email with a quote.

Now let me start by saying that this built stuff is all new to me. Iíve had 5 Subaruís including my current STi. The rest prior were wrxs. So Iím just looking at what you guys think about what I have planned so far. What should be changed and of it seems like Iím on the right path or not.

Here is a list of everything being added to car as of now (everything is still subject to change as this is still early stages)
-IAG stage 2.5 closed deck short block
-stock heads being ported/polished/resurfaced
-1mm larger intake and exhaust valves
-BC stage 3 280 degree cams
-stock valve springs and retainers
-killer b oil pick up/pan/baffle
-spearco tmic
-FP red turbo
-killer b holy header
-uppipe for external wastegate
-tial 44mm wastegate
-speed density
-id1300 injectors
-manual FPR
*** goal of 500whp ***

The car currently has the following modifications. Several of which that will be reused.
-IAG AOS (keeping)
-IAG tgv deletes (keeping)
-IAG v3 fuel rails (keeping)
-aem 340lph fuel pump (keeping)
-aem intake (keeping)
-GS ebcs (keeping)
-id1050x injectors
-Perrin turbo inlet
-GS limited catted downpipe (keeping? Might sell and go catless DP?)
-invidia q300 (keeping)

Also note that this build will be on 93 pump gas as there is no e85 where I live unfortunately!

Anyway, let me know what you think please!!
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Old 10-06-2018, 10:54 AM   #2
viper_crazy
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Re: downpipe. Will this car be driven on the road? Will it need to pass emissions? If yes to at least the second question, keeping the catted pipe may be beneficial, at least putting it up on the shelf for when you need it.
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Old 10-06-2018, 12:34 PM   #3
JSR84
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Killer B makes an EWG setup that bolts right up to their Holly headers.

Sounds like a fun build! I'm 600 Miles into the break-in of an IAG Stage 2.5. great product thus far.
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Old 10-06-2018, 03:16 PM   #4
WRX_mattb
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Quote:
Originally Posted by viper_crazy View Post
Re: downpipe. Will this car be driven on the road? Will it need to pass emissions? If yes to at least the second question, keeping the catted pipe may be beneficial, at least putting it up on the shelf for when you need it.
There are no emissions inspections in my county thank god.
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Old 10-06-2018, 03:19 PM   #5
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Quote:
Originally Posted by JSR84 View Post
Killer B makes an EWG setup that bolts right up to their Holly headers.

Sounds like a fun build! I'm 600 Miles into the break-in of an IAG Stage 2.5. great product thus far.
Yeah I will probably end up going with the killer b header/uppipe combo.

And yeah man same block Iím getting. I know you donít have many miles on it yet but what were your initial impressions? Did you get head work done too?
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Old 10-06-2018, 04:03 PM   #6
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If it's a highflow you can keep it, but I have a feeling you'll want catless and eliminate any possible exhaust restriction that may exist, especially if you're going to track the car.
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Old 10-06-2018, 04:39 PM   #7
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Quote:
Originally Posted by WRX_mattb View Post
Yeah I will probably end up going with the killer b header/uppipe combo.

And yeah man same block Iím getting. I know you donít have many miles on it yet but what were your initial impressions? Did you get head work done too?
No head work other than BC springs. I'll do a set of Cams in the future. I just had them inspected and cleaned.

My initial impressions we're how quiet it actually is. There is a small amount of slap on cold starts, but I think it's actually gotten quieter with some more distance in it... Or I'm just getting used to it.
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Old 10-06-2018, 05:35 PM   #8
bp05obxt
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Default 2012 STi build

Honestly the build list is looking good to start. I love IAGís stage 2.5 block; bang for the buck it is the nicest of the group in my opinion. If your goals are 500whp you could save yourself a lot of money by simply refreshing the heads with a valve job and spring upgrade. The OEM valves are actually very good and the stock cams are up to the task. If you want to build the heads more you can, but seriously an easy way to save money and simplify the build is in head work.

On another note the power is relying on the turbo. I would suggest going to a rotated setup for the best performance and choice in turbo.
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Old 10-07-2018, 02:42 AM   #9
WRX_mattb
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Quote:
Originally Posted by bp05obxt View Post
Honestly the build list is looking good to start. I love IAG’s stage 2.5 block; bang for the buck it is the nicest of the group in my opinion. If your goals are 500whp you could save yourself a lot of money by simply refreshing the heads with a valve job and spring upgrade. The OEM valves are actually very good and the stock cams are up to the task. If you want to build the heads more you can, but seriously an easy way to save money and simplify the build is in head work.

On another note the power is relying on the turbo. I would suggest going to a rotated setup for the best performance and choice in turbo.
Yeah man IAG is the best at what they do. Why I’ve been going to them for years!

I had considered leaving the heads alone to save some money. Time will tell come next year where I’ll be money wise for this build. If I have the spare cash, the heads will get done. If not, then that is where I’ll save the money.

Last edited by WRX_mattb; 10-07-2018 at 02:52 AM.
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Old 10-08-2018, 01:00 AM   #10
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I was also curious if the ID1300’s will be enough injector for this build. Any input?
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Old 10-08-2018, 01:26 AM   #11
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This is the 2nd JR tuned car I've heard of blowing up this week.
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Old 10-08-2018, 01:45 AM   #12
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Quote:
Originally Posted by ProZach626 View Post
This is the 2nd JR tuned car I've heard of blowing up this week.
Really!?? Funny you mention that. Not that I am questioning JR and his talent tuning. But a few things to mention about the tune. My STi never really seemed smooth after the tune. Didn’t run rough or anything. But just seemed not 100%. The day I got tuned he was running way behind as the car before mine died on the dyno and they were working on fixing it.

When mine finally was on the dyno he was done in under an hour. And he never took the car off the dyno and onto the street to clean things up. I felt as if my car was rushed.

I have been considering having Cleo, resident tuner at IAG, tune the STi this time around. Cleo tuned my last wrx and it ran awesome. Everything was very smooth and he spent a few hours on my car. A couple on the dyno and then at least 20 minutes on the street cleaning everything up. I left with no wondering and with a great experience.

Again, no doubting Jr. But some things made me wonder.
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Old 10-10-2018, 03:14 PM   #13
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Quote:
Originally Posted by ProZach626 View Post
This is the 2nd JR tuned car I've heard of blowing up this week.
He tunes a lot of cars and probably the majority of them had been tuned before meaning had unknown health to begin with. There are thousands of JR tuned cars out there running hard so just hearing of 2 cars that blew up in a week doesn't really mean anything.

At this point there are a handful of completely stock subaru's that blow up every week lol.
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Old 10-11-2018, 06:22 PM   #14
WRX_mattb
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Well everyone keep their eyes peeled. I will be selling some parts off of the STi as soon as I get them stripped off. For sure for sale will be the following:
-id1050x injectors
-aem cai
-grimmspeed limited catted downpipe
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Old 10-11-2018, 10:39 PM   #15
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WRX_mattb, you are gonna need more than what you have on your list to make that power safely. You also cannot retain the stock valve springs and retainers with that cam setup. You will need at a minimum:

1. Stiffer springs to prevent valve float
2. Titanium retainers
3. New spring seats
4. You will likely need 16 brand new lifter buckets to meet the cam clearance requirements ($25 each).
5. Get rid of the AEM CAI, you are gonna choke the turbo with that toothpick of an intake.
6. Not sure about that TMIC
7. You will the 12mm JDM oil pump
8. A better radiator
9. A better clutch
10. One step colder plugs, possibly two. Let your tuner figure that one out.
11. Not required but recommended: A fluidampr harmonic balancer.
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Old 10-11-2018, 11:10 PM   #16
WRX_mattb
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Quote:
Originally Posted by slow.wagon View Post
WRX_mattb, you are gonna need more than what you have on your list to make that power safely. You also cannot retain the stock valve springs and retainers with that cam setup. You will need at a minimum:

1. Stiffer springs to prevent valve float
2. Titanium retainers
3. New spring seats
4. You will likely need 16 brand new lifter buckets to meet the cam clearance requirements ($25 each).
5. Get rid of the AEM CAI, you are gonna choke the turbo with that toothpick of an intake.
6. Not sure about that TMIC
7. You will the 12mm JDM oil pump
8. A better radiator
9. A better clutch
10. One step colder plugs, possibly two. Let your tuner figure that one out.
11. Not required but recommended: A fluidampr harmonic balancer.
Yeah I know. The initial list in this thread was just beginning point. IAG is building me a quote. We will fine tune and add and remove things that we can to keep me within my budget and at my goal hp. Few things have already changed. Going with 1700cc injectors and a FMIC over a tmic. Things will change a lot and be adjusted before the build is ready to go. Thank you for your input though!!
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Old 10-11-2018, 11:32 PM   #17
slow.wagon
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Quote:
Originally Posted by WRX_mattb View Post
Yeah I know. The initial list in this thread was just beginning point. IAG is building me a quote. We will fine tune and add and remove things that we can to keep me within my budget and at my goal hp. Few things have already changed. Going with 1700cc injectors and a FMIC over a tmic. Things will change a lot and be adjusted before the build is ready to go. Thank you for your input though!!
Wow, 1700cc injectors? Did IAG suggest that? Seems a bit much for 500.
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Old 10-12-2018, 12:42 AM   #18
bp05obxt
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Quote:
Originally Posted by slow.wagon View Post
Wow, 1700cc injectors? Did IAG suggest that? Seems a bit much for 500.


1700ís would be good for e85 if he wants to make more than what the 1300ís would on pump. If that makes sense. 1300ís can definitely do 500hp, but if you want to run e85 it would probably be best to run 1700ís instead of asking the 1300ís to work at or close to their limit.
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Old 10-12-2018, 12:51 AM   #19
WRX_mattb
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Planning on flex fueling. That’s why the 1700’s.
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Old 10-14-2018, 04:41 PM   #20
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Quote:
Originally Posted by WRX_mattb View Post
So a few weeks ago my engine developed rod knock. Bummer! By some sort of luck it happened on the same day that I bought a new DD (2007 Honda CR-V). My initial intentions were to retire the STi from daily driving duties and getting it ready for autox. Was going to do wheels, coilovers, sway bars, tires, etc over the winter. Well now obviously my plans have changed and a build is in the future first instead.

I live in Maryland and have been going to IAG for years and my STi recently got a decent amount of work done there as well as a tune from JR. So first and foremost, the heart of this build will be one of their short blocks. I have been talking back and fourth with IAG over the past couple weeks talking details and goals. Currently awaiting an email with a quote.

Now let me start by saying that this built stuff is all new to me. Iíve had 5 Subaruís including my current STi. The rest prior were wrxs. So Iím just looking at what you guys think about what I have planned so far. What should be changed and of it seems like Iím on the right path or not.

Here is a list of everything being added to car as of now (everything is still subject to change as this is still early stages)
-IAG stage 2.5 closed deck short block
-stock heads being ported/polished/resurfaced
-1mm larger intake and exhaust valves
-BC stage 3 280 degree cams
-stock valve springs and retainers
-killer b oil pick up/pan/baffle
-spearco tmic
-FP red turbo
-killer b holy header
-uppipe for external wastegate
-tial 44mm wastegate
-speed density
-id1300 injectors
-manual FPR
*** goal of 500whp ***

The car currently has the following modifications. Several of which that will be reused.
-IAG AOS (keeping)
-IAG tgv deletes (keeping)
-IAG v3 fuel rails (keeping)
-aem 340lph fuel pump (keeping)
-aem intake (keeping)
-GS ebcs (keeping)
-id1050x injectors
-Perrin turbo inlet
-GS limited catted downpipe (keeping? Might sell and go catless DP?)
-invidia q300 (keeping)

Also note that this build will be on 93 pump gas as there is no e85 where I live unfortunately!

Anyway, let me know what you think please!!
Most of this looks pretty good.

1) I'd go rotated turbo (gen 2 3076r or 3582R) or something comparable.
2) Ditch the AEM intake
3) If you're running E85 that fuel pump/injectors are going to be maxed out or close to it.
4) Not sure what clutch you have but you're definitely going to need one for it to hold 500whp reliably.
5) I would 100% upgrade to supertech valve springs/retainers if you're dropping 280's in there but I prefer GSC S2 cams for the type of power/driving you're doing.
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Old 10-15-2018, 12:47 AM   #21
subaru_gc8
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Quote:
Originally Posted by WRX_mattb View Post
I was also curious if the ID1300ís will be enough injector for this build. Any input?
if you are planning to run e and you want 500 i would bump up to 1700. 500 would be really close to the edge of 1300 unless you decide to bump up the base pressure
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Old 11-07-2018, 02:47 AM   #22
WRX_mattb
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Thanks to everyone for the responses. I have taken many of the recommendations here along with some others and have been working with IAG on getting a better idea where I want to go with this build. A decent amount has changed and I think I’m finally about where I want to be with the build. Apparently first of the year IAG will be coming out with some new blocks. Essentially everything short block and head wise will be remaining the same with the main change being the addition of 1/2 inch head studs, and the killer b oil pan and baffle to go along with their ultimate pick up.

The big change is going to be in the turbo set up. After some thinking I decided that with a build like this it would be foolish of me to do two things. That beings 1) stick with a stock location turbo; and 2) sticking with pump gas.

The following has been added/changed:
-ETS rotated turbo kit with Garrett gtx3582r
-ETS v-band EL exhaust manifold
-ID1700cc injectors
-Cobb flex fueling package
-dual fuel pump hanger
-aeromotive manual FPR

**goal of 550-600whp
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Old 11-09-2018, 02:27 PM   #23
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I like where your head is at with the turbo and fuel aspect of this build. Good move you wonít regret going rotated and bigger.
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Old 11-12-2018, 01:02 AM   #24
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Quick recommendation, keep stock valve size, they flow better then +1mm Valves. The fastest STIís are stock size with a stock sized inconel exhaust valve. Also S2 GSC cams are pretty up there too.
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Old 12-09-2018, 03:08 AM   #25
WRX_mattb
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As predicted things have changed up a bit. Mainly due to IAG’s new blocks being released. As it stands NOW, looking at the following for the engine build.....
-IAG stage 2.6 Trojan closed deck short block
-stock heads being ported/polished/resurfaced
-BC stage 3 280 degree cams
-1mm larger intake/exhaust valves
-Manley titanium valvetrain
-killer ultimate oil pick up
-killerb oil pan and baffle

Turbo kit/fueling mods
-ETS rotated turbo kit
-Garrett gtx3576r gen 2 turbo
-tial 44mm ewg
-ETS exhaust manifold
-ETS fmic
-speed density
-id1700 injectors
-dual fuel pump hanger
-aeromotive manual FPR
-flex fuel

Power goal-650whp
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