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Old 02-03-2010, 04:58 PM   #1
Pacemaker
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Default 08 WRX Blouch 18g build ...

Car: 2008 WRX currently Stage 2.

Been driving around on Stage 2 for a while now, at first it was a lot of fun, but am just plain bored with it now. Over the next few months I am going to gather the parts I need for a larger turbo install.

As of right now I'm thinking about going the route of the Blouch TD05-18g.

What I'm looking for: Fairly quick response, and holds to redline. The car won't see the track much ( maybe once or twice a year ). Mostly around were I am street racing and autox are it, and is exactly what I will be doing with this car. Would like around 350 - 400 whp.

Here is a list of what I am planning to be putting on the car:

Perrin CAI ( already on car )
Perrin TBE ( already on car )
Perrin Lightweight Crank Pulley ( already on car )
Blouch TD05-18g
Deatschwerks 750cc Injectors
Walbro 255 Fuel Pump

Now if I'm missing anything or someone has a different suggestion for my use and goals please chime in and let me know what you think.

Was wondering if any of these are needed, or would help as well:

Bigger TMIC? ( would really like to stay top mount )
Up Pipe?
Header? ( want to keep unequal, love that Subaru sound )
TGV Deletes?
EWG?
Meth kit?
Bigger injectors for possible E85?

Anything else?

Thank you in advance.
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Old 02-03-2010, 05:20 PM   #2
the suicidal eggroll
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* bigger tmic would help, at least an STi tmic if not a spearco, aps, etc.
* I would only do a new uppipe if you did a new header as well. Something like a gt-spec or gruppe-s large diameter header with a matching large diameter (~2.3") uppipe = sex
* TGVs would help, it's up to you
* EWG would help, it's up to you
* I wouldn't do meth, not my cup of tea
* E85 would definitely help, you'll need more than injectors though, probably a double-pumper setup

350 whp should be achievable on an 18g, but you're not going to get 400 whp. 18g is around 340-350whp territory, 20g is 360-370, 30r/dom3 is 390-400. This is on 93 octane, if you switch to E85 you can bump all of those up around 50whp. Header and EWG would help, but you're still not going to get anywhere near 400 whp with an 18g on pump.

Once you break 300whp you need to start looking into a new tranny as well. At 350whp and higher it's not going to last very long.
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Old 02-03-2010, 06:03 PM   #3
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Thanks for the suggestions Suicide ... I hadn't even thought about the tranny.

Also Blouch claims the 18g is good for 400hp, they must be talking on race gas then?

Also what about clutch and pressure plate upgrade? What is the stock clutch torque rating?
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Old 02-03-2010, 06:04 PM   #4
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Quote:
Originally Posted by Pacemaker View Post
Thanks for the suggestions Suicide ... I hadn't even thought about the tranny.

Also Blouch claims the 18g is good for 400hp, they must be talking on race gas then?
They're probably talking about crank HP, not wheel HP.
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Old 02-03-2010, 06:24 PM   #5
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Something I just don't get is people's persistance to stay top-mount for the street cars... TMIC makes more sense for track cars rather than street cars. At least then you have a warm-up lap to get the core as cool as its gonna get while running.

Guys.. what happens when you're frustrated in bumper to bumper traffic and then it finally lets up? You smash the throttle and try to roar out of the clusterf**k. Well... after the past minutes of not moving... you've been pan-frying your intercooler ontop of your stove of an engine block. And when you go WOT out of a traffic jam, you're engaging in one of the most destructive scenarios to a TMIC setup. And Subaru engines just cannot tolerate this abuse for long. If you're going to change your intercooler... grow a pair and get what the car needs. Don't matter if your goal is 300 or 500whp.. just go front-mount damnit!
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Old 02-03-2010, 06:30 PM   #6
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Something I just don't get is people's persistance to stay top-mount for the street cars... TMIC makes more sense for track cars rather than street cars. At least then you have a warm-up lap to get the core as cool as its gonna get while running.

Guys.. what happens when you're frustrated in bumper to bumper traffic and then it finally lets up? You smash the throttle and try to roar out of the clusterf**k. Well... after the past minutes of not moving... you've been pan-frying your intercooler ontop of your stove of an engine block. And when you go WOT out of a traffic jam, you're engaging in one of the most destructive scenarios to a TMIC setup. And Subaru engines just cannot tolerate this abuse for long. If you're going to change your intercooler... grow a pair and get what the car needs. Don't matter if your goal is 300 or 500whp.. just go front-mount damnit!
Haha, I get what you are saying. Though I'm not really an aggressive driver when there is traffic, and rarely go WOT in traffic. I live in a town that is in a valley, and the best roads ( most fun ) for spirited driving and racing are very curvey paths up the mountains all around me, and there is never traffic on them to worry about getting heat soaked.
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Old 02-03-2010, 09:00 PM   #7
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honestly having went from tmic to fmic you really won't notice a difference in lag if tuned right. What you will get is a longer lasting motor. more top end power and a healthier running car in general.And it doesn't matter if you don't hit traffic at all the moment you stop at a light or a stop sign your underhood temps will skyrocket on a hot day. btw you'll love the 18g and just to clarify blouch's numbers for their turbos are at the crank not at the wheels. But i guarantee if you set your car up for e85 and go with an aggressive map you can make 400whp on a dynojet. I was able to make 358whp and 410wtq with an agressive tune on 93oct but i had my tuner tune it down to 18lbs to save my tranny. Also go with a bigger set of injectors the first time even if you decide not to use e85 it will keep your injector duty cycles down and give your tuner more room to make more power efficently. I also recommend getting an aem truboost as it will give you a consistent boost curve and reduce the likely hood of boost creep.

Last edited by RedRex26; 02-03-2010 at 09:08 PM.
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Old 02-03-2010, 09:02 PM   #8
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Originally Posted by RedRex26 View Post
honestly having went from tmic to fmic you really won't notice a difference in lag if tuned right. What you will get is a longer lasting motor. more top end power and a healthier running car in general.
+1

The myth that FMICs create more turbo lag pushes me to wanting to kick babies. That'd be like saying "Don't get a downpipe, they make you overboost and blow your engine."
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Old 02-03-2010, 09:14 PM   #9
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Thanks guys, I really appreciate the input ...

So it sounds like I will go with the 850 injectors.
And I haven't cmpletely ruled out a FMIC yet, still tossing that idea around.

It's not that I'm worried about the lag, just wasn't sure if it was necessary for this set up.

Also, say I would be running 18-19 psi on the 18g, what could I expect it to hold at redline?
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Old 02-03-2010, 09:21 PM   #10
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its def a must ive seen a friend of mine actually crack a sti topmount on a 16g on a hot day. And don't even bother with an ebay topmount as they retain twice as much heat and even the expensive ones aren't even that good as well. I highly recommend a fmic. I have the the ssac fmic and love it because not only are they cheap but they have been proven to work very well. You can usually pick a used one up for about 250 to 300 dollars. i got mine brand new for 375. If your looking for a set of injectors i highly reccomend picking up a set of pre flow matched injectors from witch hunter performance. I have the 864cc ones and they tune and work excellent. you can easily sell your stock injectors for 200 and for over another 175 for a set from witchhunter. they also have a trade in program where you get 112 for your stock injectors toward a set of their injectors. i hope this helps let me know if you have any more questions.
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Old 02-03-2010, 09:34 PM   #11
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So as I'm piecing all of this together, I will be buying everything gradually. Should I just wait to put it all on at the same time, or install it part by part as I get the items? I will be doing all the tuning myself so having to tune after parts isn't a problem. I've been slapping turbo kits on snowmobiles and tuning them for years, so I'm not worried about that, the basics are the same, just a four stroke engine opposed to a two stroke.

And if I do add as I go, is there any certain order to install first?

Thanks for all the help.
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Old 02-03-2010, 09:52 PM   #12
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The only thing I wouldn't install separately is the turbo, injectors and pump. Other than that.. if you really know what you're doing on the tuning side and don't mind tuning every time, by all means have at it.
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Old 02-03-2010, 10:14 PM   #13
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Is the 18g that you are considering flanged like the stock '08 turbo? If its an STI style of turbo, you are limited to a FMIC, TMIC like a process west or a self made ebay TMIC. There can also be a problem with fit as it needs to be clocked slightly to clear a connector. There is also a flanged 18G that would allow you to use a stock styled perrin or avo topmount. I wouldn't worry much about airflow with the huge scoop on the '08, I run a home made topmount on an '08 and shot it constantly with an infrared thermometer. Never had any signs of severe heat soak on the hottest days.
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Old 02-04-2010, 03:05 PM   #14
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Is there any point to change out the fuel rails on these cars?
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Old 02-04-2010, 04:44 PM   #15
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I upgraded to the perrin fuel rails just to be safe with the extra fuel the motor is going to require. I was in a toss up between the 18g or the Dom .5r but i think i am going to go with the td06 18g with the 8cm housing so it flows to redline. I am going to stay top mount after seeing some impressive numbers.
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Old 02-04-2010, 05:36 PM   #16
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You might look at a new turbo inlet as well
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Old 02-05-2010, 12:23 AM   #17
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What are your guys thoughts on brand of headers?

Sounds, performance, diameter, fitment?
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Old 02-05-2010, 02:22 AM   #18
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sticky post would do a better job explaining it... but basically if you want subie rumble still.. go UEL... you want a mild advantage in performance.. go EL. You want a pretty damn good improvement in performance.. get Full Race's 1.5-scroll setup. I'm not sure which ones but i think you need to switch to an STI oil pan to clear certain manifolds.
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Old 02-05-2010, 09:58 AM   #19
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The only problem i foresee with going full-race 1.5 twinscroll headers for this build is that he wont be able to run a blouch or an fp turbo due to the GT series flange that they provide. I could be mistaken, can anyone validate this? you could run a big 28r or a small 30r if you wanted the full race setup but then that would put you close to the 4000 dollar mark for the headers, uppipe, tial ewg, and a GT series turbo.
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Old 02-05-2010, 02:58 PM   #20
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You can switch the up-pipe but here's the up-pipe that comes with the 1.5 kit

http://www.full-race.com/catalog_ima...%20%282%29.jpg

http://www.full-race.com/catalog_ima...%20%284%29.jpg
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Old 02-05-2010, 08:29 PM   #21
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Thanks for all the information guys!

This may be a dumb question ( most likely is, but want to make sure anyways ) ... With currently running stage 2, if i installed a header and uppipe, and nothing else, would I need to retune for them? I'm sure if i did retune I would see greater gains than just bolting them on, but is it necessary to retune to prevent any sort of damage occuring?

Thanks.
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Old 02-05-2010, 08:41 PM   #22
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Well if you get something like the FR 1.5 scroll, it would change the way your boost comes in so yeah a tune would be smart. But an UEL and even most EL w/ standard design uppipes will be fine without a tune
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Old 02-06-2010, 08:21 PM   #23
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I'm with ya, OP. Was a stage 2 for a while, but I bought the WRX to actually have a fun car. Hence, finished my "build" last year....

Do yourself a favor and go with 850cc injectors. For one reason, once you see the NIGHTMARE in swapping injectors on an 08 (easier on previous models) you will NEVER want to need to change injectors again. I speak from experience.

Go with a FMIC. I have one, and even on a puny vf48 there is next to no lag. I've since got a Blouch 20G in my garage.... But with the FMIC you can use ANY turbo thats flanged for a Subaru. If you go with a TXS FMIC then just by fate, it is modifiable with the AMS rotated option for their FMIC on the 08s. Who knows, and one day you may want to go rotated if you want to ever have a big turbo.

Don't bother with the 18G... Get a 20G and get an AVO turbo inlet specifically for the 08+ cars otherwise the 'new' air pump under the intake manifold will make installing any other turbo inlet impossible. You will need an inlet for a 20G Blouch. A BNR 20G will accept the stock inlet.
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Old 02-06-2010, 08:22 PM   #24
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Quote:
Originally Posted by Pacemaker View Post
Thanks for all the information guys!

This may be a dumb question ( most likely is, but want to make sure anyways ) ... With currently running stage 2, if i installed a header and uppipe, and nothing else, would I need to retune for them? I'm sure if i did retune I would see greater gains than just bolting them on, but is it necessary to retune to prevent any sort of damage occuring?

Thanks.
Leave the up-pipe alone................. unless you like throwing $100 out the window!
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Old 02-06-2010, 10:44 PM   #25
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Go here for injectors you won't find a better deal.

http://www.witchhunter.com/subarumod1.php4
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