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Old 08-19-2018, 04:25 PM   #1
Fl4t_Matt
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Question Cams and bigger turbo

So right now I have a 2005 WRX that is full bolt on and on E85 so what i'm trying to find out is all the supporting things I need to buy in order to run Brian Crower Stage 3 280 camshafts and either a Cobb TDO5H-20G or a 2005 STI turbo. I have an upgraded fuel system and am getting a good front mount but I need to know anything else that is necessary to properly run cams and a bigger turbo.
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Old 08-19-2018, 04:27 PM   #2
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Also with running this all and tuning would I need to run some kind of drag radials at the strip in order to keep traction and not completely spin off my tires.
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Old 08-20-2018, 12:48 AM   #3
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Turbo choices are too small for that much camshaft. Those cams require clearance get be done to the heads to make sure the lobes don’t hit the heads. Get a milder cam and or a bigger turbo. Also need upgraded springs and retainers.
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Old 08-20-2018, 09:31 AM   #4
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u dont need cams for an STI turbo. nor will you need drag slicks.
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Old 08-20-2018, 09:40 AM   #5
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Quote:
Originally Posted by Fl4t_Matt View Post
Also with running this all and tuning would I need to run some kind of drag radials at the strip in order to keep traction and not completely spin off my tires.
How much power do you figure you're gonna run with this setup?
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Old 08-20-2018, 12:52 PM   #6
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Quote:
Originally Posted by viper_crazy View Post
How much power do you figure you're gonna run with this setup?
Iím wanting to run at the most 450 because itís still a street car
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Old 08-20-2018, 01:09 PM   #7
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Originally Posted by wrxhard View Post
Turbo choices are too small for that much camshaft. Those cams require clearance get be done to the heads to make sure the lobes donít hit the heads. Get a milder cam and or a bigger turbo. Also need upgraded springs and retainers.
So what cams would you recommend to clear the head, or would buying a bigger turbo alone be better
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Old 08-20-2018, 01:57 PM   #8
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Everyone here is "shooting in the dark" because of your phrase "full bolt ons".

The only real info you gave is BC Stg3 Cams.

However, that is so far past "about 450hp" hardware that you made your own question irrelevant.

If you are serious about drag racing then forget keeping the car as a "daily driver", talk to a real tuner and machine shop, then buy a new daily driver.
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Old 08-20-2018, 02:12 PM   #9
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A bigger turbobis all you’ll need for that 450 mark. That and a well built bottom end.
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Old 08-20-2018, 02:21 PM   #10
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Quote:
Originally Posted by kharmicresonance View Post
Everyone here is "shooting in the dark" because of your phrase "full bolt ons".

The only real info you gave is BC Stg3 Cams.

However, that is so far past "about 450hp" hardware that you made your own question irrelevant.

If you are serious about drag racing then forget keeping the car as a "daily driver", talk to a real tuner and machine shop, then buy a new daily driver.
Well when someone says full bolt ons what do you go to? Things that bolt on to make the car faster, and the reason Iím setting an hp mark is because Iím getting info on what is a good combination for that and those were just some things in my price range that I had picked out. I donít have the money to make the car a real drag car so I want a good combination of power and street ability.
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Old 08-20-2018, 03:20 PM   #11
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Quote:
Originally Posted by Fl4t_Matt View Post
Well when someone says full bolt ons what do you go to? Things that bolt on to make the car faster, and the reason Iím setting an hp mark is because Iím getting info on what is a good combination for that and those were just some things in my price range that I had picked out. I donít have the money to make the car a real drag car so I want a good combination of power and street ability.
I apologize for coming across harsh.

As other posters noted, all you really need is a larger turbo and tuning.

But take a realistic look at what you asked?

You want to take a 2005 wrx ( with how many miles and bolt ons? ) and driveline problems; throw in whatever parts you can to reach ~450hp, and go drag racing and still daily drive it.

Without details on your build, all any of us here in the internet peanut gallery can do is give you the exact advice you need to trash whats left of your driveline or blow up your shortblock.

A dead car cannot be driven daily.
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Old 08-20-2018, 03:22 PM   #12
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You won't need drag radials with 450hp. Maybe some stickier tires, yes, like a summer performance kinda deal, but not a drag radial. 2018 Mustangs have roughly that kind of power from stock and they are acceptable for drag use on stock tires when they tech in.

Unless your plan is to eventually make more than 450, I'd say save your money from buying cams. The heads generally become a limiting factor around 450hp, maybe more, maybe less, depends on many factors (elevation, weather, other parts, etc).

You can make 450hp with big turbo (maybe rotated territory, but you're running E85 so stock location is doable), bigger injectors (I'd say 1000cc or bigger for headroom), high flow fuel pump, fuel rails and other supporting parts.
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Old 08-20-2018, 03:41 PM   #13
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Quote:
Originally Posted by Fl4t_Matt View Post
So right now I have a 2005 WRX that is full bolt on and on E85 so what i'm trying to find out is all the supporting things I need to buy in order to run Brian Crower Stage 3 280 camshafts and either a Cobb TDO5H-20G or a 2005 STI turbo. I have an upgraded fuel system and am getting a good front mount but I need to know anything else that is necessary to properly run cams and a bigger turbo.
I think those cams are too big for a 20g. you should either try stage 1 or 2, or a bigger turbo
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Old 08-20-2018, 06:51 PM   #14
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Do a lot of research before spending $ on cams, they are damn expensive on these cars and can do more harm than good if you go too big. I'm no expert in cam selection but I think most ppl go too big. You'd probably be fine with stage 1 (26X duration) if anything but do research. Huge cam can equal lag/slow off the line and a not fun car to drive on the street.
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Old 08-20-2018, 08:55 PM   #15
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Well thanks everyone for your inputs, I think Iíd be better off just keeping a conservative tune until I can build the bottom end and go big turbo. Glad I asked instead of dropping 700 on cams and another 5k on a new motor
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Old 08-20-2018, 10:16 PM   #16
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Let me come at this from a different angle.
A nice eazy bolt on setup for an 05 wrx would be:
-STI turbo (vf39 or similar... LOTS of options)
-STI catless exhaust manifold and up pipe(or maybe a header)
-STI intercooler
-bigger injectors
-get it tuned/install a cobb tune etc.

You won't need to do anything to your bottom end or heads or cam with that setup. As far as a hp number I have no idea, but it will be way better than stock.

Getting rid of the cats in your turboback exhaust is another eazy bolt on that can help the turbo spool
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Old 08-21-2018, 07:10 AM   #17
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Gsc s3 cams are waaaaaaay too big for a 450 HP car. The car will be a dog in low rpm street driving and is just totally unneeded. If you are dead set on camming the engine go with s1's, maybe s'2 if you plan to go beyond 450 in the near future or maybe even Tomei poncams. Bigger isn't always better.
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Old 08-21-2018, 11:44 AM   #18
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Default Cams and bigger turbo

both a 20g and VF turbo will get you nowhere near 450whp.

a VF will see 310-320 tops on the highest reading dyno you can find and a 20g youíre looking at 360ish. both of these figures are on ethanol. expect less on pump gas.

to get 450whp youíll need a turbo flowing at minimun 55lbs/min and ethanol. even thats a stretch. im being generous in my estimation.

also i should add, 450whp on a stock EJ205 will make it explode. you will need to build your motor and consider a closed deck.

Last edited by Titter; 08-21-2018 at 11:51 AM.
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Old 08-21-2018, 03:30 PM   #19
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Quote:
Originally Posted by Supernouht View Post
Let me come at this from a different angle.
A nice eazy bolt on setup for an 05 wrx would be:
-STI turbo (vf39 or similar... LOTS of options)
-STI catless exhaust manifold and up pipe(or maybe a header)
-STI intercooler
-bigger injectors
-get it tuned/install a cobb tune etc.

You won't need to do anything to your bottom end or heads or cam with that setup. As far as a hp number I have no idea, but it will be way better than stock.

Getting rid of the cats in your turboback exhaust is another eazy bolt on that can help the turbo spool
And also an upgraded fuel pump
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Old 08-21-2018, 09:07 PM   #20
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Quote:
Originally Posted by Titter View Post
both a 20g and VF turbo will get you nowhere near 450whp.

a VF will see 310-320 tops on the highest reading dyno you can find and a 20g youíre looking at 360ish. both of these figures are on ethanol. expect less on pump gas.

to get 450whp youíll need a turbo flowing at minimun 55lbs/min and ethanol. even thats a stretch. im being generous in my estimation.

also i should add, 450whp on a stock EJ205 will make it explode. you will need to build your motor and consider a closed deck.
I totally agree with that, inorder to see that much power, you will need at least a gen1 3071 and probably pushing like 30ish psi
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Old 08-22-2018, 10:41 AM   #21
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Whatever turbo you go with, Stage 3 cams are definitely not in the cards: too much hit on the low torque.
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Old 09-01-2018, 08:37 PM   #22
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I just did some math on the BC 280 single-AVCS cams, and they have 6 degrees of overlap (@ .050), which is a lot by turbocharged standards (especially with a small-ish turbo like the ones you're looking at). AVCS lets you advance the intake cam, would theoretically help out low-end performance, except that it makes the overlap even larger so it would probably work against you.

In other words, the folks advising against those cams are right.

BC 272 single-AVCS cams, on the other hand, have -6 overlap (underlap?) which is more suited for a turbo car. You could give it a few degrees of intake advance before overlap starts, so I don't think you'd lose much on the low end. BC says you can run them with stock valve springs.

450whp with a TD05-20G isn't going to happen, even on E85. I'd guess 375whp. This thread suggests that G25-660 might get you there, or at least come close:

https://forums.nasioc.com/forums/sho....php?t=2883288

...which is pretty amazing for a turbo that comes into boost at about the same RPM range as a 20G.
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Old 09-02-2018, 12:30 PM   #23
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hey here is an article from a friend's build
http://speed.academy/subaru-wrx-sti-...21966552734375
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