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Old 07-31-2013, 04:59 PM   #1
SubbieNoob
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Default 380HP goal. help please.

Hello, so I started the build about a year ago and I had hit 320WHP and now I want to do roughly around 360-380WHP.

My question is, will the crankshaft be able to handle 380whp (being the max) about 456 at the crank (20%)?

I currently have a TD06-20g for a 2.0L wrx, it was put in because I knew one day I would need the power, especially at top end. And it spools relatively quick.

It currently has bent valves (do not ask), so I was going to replace the valves but said screw it and decided to go all out.

I will being changing the valves, keeping mostly a stock cylinder head, the block will have forged pistons and forged rods, I want to keep the stock crankshaft.

800cc injectors
walbaro 255lph
large top mount (personal preference)
up pipe and 3" turbo back
exedy clutch/ stock fly wheel
cold air
turbo inlet
etc.etc.

will the crank hold 380whp? Dont worry about the tranny, I am a careful driver.
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Old 07-31-2013, 05:00 PM   #2
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It should , especially with the forged bits. Fill out your profile. I had a 20G on my v7 sti motor and made 380whp with meth.
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Old 07-31-2013, 05:02 PM   #3
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yes I do, and will do.
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Old 07-31-2013, 05:40 PM   #4
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Crank is fine. Stock cranks don't really fail.
Heads (cams) will be sucking at that power level and you'll have a pretty narrow powerband, especially if you're trying to do this on pump gas.

If you have a model year with shimless buckets in the heads (late 03-05) do decent cams and springs and balance the crank. This will give you a comfortable 8000-8500 RPM redline and your goal gets easier since the stock cams aren't holding back power plus you end up with a more usable powerband due to the extra RPMs before redline.

With mostly stock heads, and a big turbo, the cams start holding you back at high RPMs and even if you have the hardware to spin 8k or 9k, there's no reason to because the engine can't breathe.

You can make your goal with stock heads if you use E85 or race gas, but your powerband will suck. A 350 WHP setup with proper cams and supporting work will outperform a 380 WHP powerband on stock heads in the real world.

If you're just shooting for a number. That's fine, but just be aware that there's more to performance than a peak number.

Edit: I see you filled out that you have an 02. Anything over ~7500 RPM will be held back by the shimmed buckets. You need to convert to shimless buckets as well to raise the redline. Cams are still not a bad idea. I cringe at a 380 WHP setup on stock heads.
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Old 07-31-2013, 05:46 PM   #5
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Im getting new valves, looking into cams now.
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Old 08-01-2013, 01:33 AM   #6
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Swap in a 2.5 with AEM ecu. Keep your intake manifold, tgvs and injectors. Run the 20g. It's probably cheaper and just as fun
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Old 08-01-2013, 02:00 AM   #7
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I've been running 375whp on my bone stock long block ej205 for over 7 months with tons of hard runs. No issues.
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Old 08-01-2013, 09:38 AM   #8
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Quote:
Originally Posted by Fierysun View Post
I've been running 375whp on my bone stock long block ej205 for over 7 months with tons of hard runs. No issues.

Dyno and mod list please
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Old 08-01-2013, 02:35 PM   #9
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Quote:
Originally Posted by Brother EddieJ. View Post
Dyno and mod list please
http://forums.nasioc.com/forums/show....php?t=1962172
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Old 08-01-2013, 07:33 PM   #10
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375whp is crazy and dangerous, you probably got a very lucky picked block from the factory haha.
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Old 08-01-2013, 09:24 PM   #11
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Quote:
Originally Posted by SubbieNoob View Post
375whp is crazy and dangerous, you probably got a very lucky picked block from the factory haha.
LOL! That is not the case, the ej205 is more than strong enough to handle 400whp. The issue with this motor is proper oil management: good oil, good oil pressure, and never letting the oil level get low. Sounds simple, but people blow (literally and figuratively) it regularily. My car has been modded every mile of its life and driven hard, however it has been well taken care of and maintained.
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Old 08-01-2013, 09:41 PM   #12
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Quote:
Originally Posted by SubbieNoob View Post
375whp is crazy and dangerous, you probably got a very lucky picked block from the factory haha.
I'm running what I guess is around 330-350wheel and no problems yet bone stock ej205
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Old 08-01-2013, 09:41 PM   #13
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Quote:
Originally Posted by Fierysun View Post

LOL! That is not the case, the ej205 is more than strong enough to handle 400whp. The issue with this motor is proper oil management: good oil, good oil pressure, and never letting the oil level get low. Sounds simple, but people blow (literally and figuratively) it regularily. My car has been modded every mile of its life and driven hard, however it has been well taken care of and maintained.
This man speaks the truth.
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Old 08-02-2013, 06:27 AM   #14
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Quote:
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That's a beast of a bugeye!!
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Old 08-02-2013, 07:15 AM   #15
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Alright, I'm a bit jealous lol

Last edited by SubbieNoob; 08-02-2013 at 07:22 AM.
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Old 08-02-2013, 11:11 AM   #16
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Quote:
Originally Posted by Brother EddieJ. View Post
That's a beast of a bugeye!!
hell yeah.
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Old 08-02-2013, 12:13 PM   #17
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Lmfao, I might just do a rebuild and leave the stock internals and use that money for PPG gears.
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Old 08-02-2013, 06:39 PM   #18
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Quote:
Originally Posted by SubbieNoob View Post
Lmfao, I might just do a rebuild and leave the stock internals and use that money for PPG gears.
Yeah, I assumed you were doing something for the tranny. That's the big issue with the 2.0L.

They're good at ~300 pump / ~350 E85, but beyond that you hit the limitation of just about everything on the damn car:
- Rods are definitely in the danger zone at that
- Pistons are also suspect
- Cams start detracting significant power
- Torque levels start being high enough to really worry about the transmission.
- Rear R160 diffs start going if you replace everything else and do drag passes

You reach like every limit of the car. So just be prepared to do everything or just stop before you're in too deep and sell it and get an STi... or at least a 2.5L that has AVCS and cams that don't hold you back like the 2.0L cams do. Ultimately the amount of money spent is not all that different... unless you buy a blown engine /tranny 2.0L for a steal and swap everything.
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Old 08-03-2013, 02:39 AM   #19
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I agree the 2.0 tranny is pretty limited is it true that a 1996 legacy spec b has a stronger transmission than the USDM Wrx 2.0 trans? I heard it on a YouTube video but I can't find any more info anywhere.
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