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Old 07-10-2008, 02:33 PM   #1
KenSekiguchi
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JDM V7 EJ207/13' Felt Z85

Default My EJ205 is Dead.....Help Me Build a 400-450HP RELIABLE DD

OK, so I spun a rod bearing on my EJ205 a few months back and now I've saved up enough money to start building a new motor. My goal is a 400 - 450 HP RELIABLE (can't stress that enough) daily driver. I'll be using a brand new EJ257 as a platform for my build. I've budgeted $5K for parts and labor and would like everyone's input on which options I should go with. I would like to invest a good portion of my budget into the heads (I plan on keeping the 2.0L heads) and I will be using Ferrea Enhanced Alloy Dual Springs/Ti. Retainers/Spring Seat Locators/Steel Valve Locks/Valve Stem Seals, and Kelford Cams (264/264). The only thing I'm not too sure of is what valve manufacturer to go with. I would like to use Ferrea or Manley Valves, but they are $$$, but I have been hearing good things about the Supertech Nitride Coated Valves and they are not that expensive. I would like to port and polish the heads and match the chambers to the 2.5L, but haven't found anyone in northern Illinois that does an excellent job. Thanks.
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Last edited by KenSekiguchi; 07-10-2008 at 08:12 PM.
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Old 07-10-2008, 02:40 PM   #2
sluflyer06
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Default

400-450 CHP or WHP?

if its wheel you should be looking into some forged piston, ARP studs, maybe also bearings main&rod.

There are a couple machine shops I've seen reccomended here in Chicago. One of them is repairing my drivers side head right now so I can let you know how good their work is.
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Old 07-10-2008, 03:22 PM   #3
DTSTI
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you can make 400hp on a stock sti bottom end and be fine.
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Old 07-10-2008, 06:36 PM   #4
KenSekiguchi
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Default

Let me clarify, I would like to put down 350-375 WHP. Since I am picking up a band new EJ257 short block, I would like to swap out the factory pistons for forged ones, extra insurance so to speak. The stock rods and crank, from what I hear, are good up to 500 CHP as long as the tune is proper and slightly towards the rich side, and of course, keeping it under 8K. The factory bearings, from what I've read and from what people have told me, would be suitable for my desired HP range, as long as I shim the STI oil pump with an additional two washers (total of three in the pump) for additional pressure and again, keep it under 8K, don't want to spin another rod bearing. What I'm pretty much asking is is I can have your 2 cents. I'm not experienced in building motors (I'll leave that to Dylan @ DS1) and I've just recently been studying all this new info day in day out so I don't waste my money and have to be without my Bugeye for the next few months, again.

Last edited by KenSekiguchi; 07-11-2008 at 02:03 AM.
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Old 07-12-2008, 12:40 AM   #5
slowmike
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Cal Ron at http://www.raw1performance.com/ he's in Il and will help you build a reliable engine that will meet your goals.
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Old 07-12-2008, 02:05 PM   #6
CoolRex
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Quote:
Originally Posted by KenSekiguchi View Post
Let me clarify, I would like to put down 350-375 WHP. Since I am picking up a band new EJ257 short block, I would like to swap out the factory pistons for forged ones, extra insurance so to speak. The stock rods and crank, from what I hear, are good up to 500 CHP as long as the tune is proper and slightly towards the rich side, and of course, keeping it under 8K. The factory bearings, from what I've read and from what people have told me, would be suitable for my desired HP range, as long as I shim the STI oil pump with an additional two washers (total of three in the pump) for additional pressure and again, keep it under 8K, don't want to spin another rod bearing. What I'm pretty much asking is is I can have your 2 cents. I'm not experienced in building motors (I'll leave that to Dylan @ DS1) and I've just recently been studying all this new info day in day out so I don't waste my money and have to be without my Bugeye for the next few months, again.

Just get the new 2008 STi oil pump. Its bigger....or get the JDM 12mm oil pump.
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Old 07-15-2008, 12:59 AM   #7
KenSekiguchi
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Default

One question, will the 08' STI oil pump's pressure be greater than a previous years STI oil pump that is shimmed? Also, how much HP can the stock STI short block handle? I've heard of people running 400-500HP on stock blocks, but not lasting long. I'm looking for RELIABILITY here.....
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Old 07-15-2008, 09:13 AM   #8
CoolRex
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400-500 HP all day on a stock block....however the tune is key here. Dunno about the oil pump but I'd rather use a throw in solution vs a modified solution.
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Old 07-15-2008, 10:31 AM   #9
bluescoobywagon
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Quote:
Originally Posted by slowmike View Post
Cal Ron at http://www.raw1performance.com/ he's in Il and will help you build a reliable engine that will meet your goals.
+1 for Ron

http://www.raw1performance.com/index_files/Page523.html

At that power level, I would get forged pistons (and I did.) Also, for the valves, the Supertech Nitride are fine for the intake, but I would go inconel for the exhaust. A shimmed 10mm pump is all that's needed.

The 2.5, ported WRX heads, Kelford cams, and a Dom3 would get you an easy reliable 400hp-450hp.
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Old 07-15-2008, 09:10 PM   #10
KenSekiguchi
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Default

I'll definitely be going with a set of forged pistons, CP or Mahle, from which I hear, those two manufacturers produce the best pistons for the EJ's, but should I leave the combustion chambers on the heads as they are, or machine them to match the 2.5L? I have read that when you machine the 2.0L combustion chambers to match the 2.5L, you lose the "quench" area at TDC. Can anyone put some truth to this?
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Old 07-17-2008, 02:29 PM   #11
bluescoobywagon
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It'll depend on piston design. If the CP's are the stock shaped dishes, the quench is at the top and bottom of the piston and you can open up the chamber while leaving that portion intact. If it's the standard round dish (Mahle pistons will be this way,) the quench is all the way around the chamber and you could leave some of the chamber intact there.
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Old 07-17-2008, 02:49 PM   #12
CoolRex
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You ought to take that EJ205 and throw in a EJ257 crank with EJ257 rods and custom pistons and have a killer setup that will rev.
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