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Old 07-26-2008, 06:34 PM   #1
BluScubi
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Default To Build or Not to Build?

Whats up everybody? I'm fairly new to this forum but I've been doing alot of research as of late. My basic question is:

Is it worth replacing stock internals on a 2.0 with forged pieces if my final goal is approx 280awhp? This is my DD. Not looking to make massive power. No tracking or auto x, anything like that. Just want a good street driven car with an occasional bat outta hell run.

Here's my situation:
I've been taking auto tech classes at the com college and working in the field for about 2.5 years. In Semptember I 'm taking the engine rebuild class (put it off till now due to $$). I've got a 2.0 short block with low miles and in good condition (13k), and some used heads on the way (10K).

I was thinking of installing a rebuild kit from gruppe-s while I'm in there. I understand that with forged internals I will NOT make any more power over stock. This is really more for piece of mind and the option to make more power down the road. Is this overkill? Other option would be to simply do the rebuild with oem parts and WHEN my current block goes replace it with the rebuild. Current engine runs fine. Manifold vac 18-20inhg. Powerbalance test all cyl within 10%, but I do know I have leaking valve seal on cyl 2.

I also understand that piston to cyl wall clearances will be different, there may be issues with false knock detection and I will need a tune. I'm sure there are alot of other factors I'm forgeting, but like I said Im still researching and hopefully some of you can help me out without flaming me to hard. .

The gruppe-s kit is 799 and includes: forged CP pistons and rings, forged Helix rods and ACL bearings. Then there' t belt, t belt tensioner, idlers, water pump, oil pump, engine gasket set, head bolts etc, which roughly doubles that. So I'm gonna round up and say 2k without a tune for the engine.

My future set up will include:
ProTune
FP or DB TD05 16G
650cc injectors
Warlboro fuel pump
Sti or equiv top mount
Gm boost control sol and manual boost controller (hybrid setup)
Have not decided on clutch, lightened flywheel??
TGV deletes
PnP throttlebody, intake mani worth it?

Current set up:
2002 WRX sedan, just hit 78k miles
Catless heatwrapped uppipe
Catted turbo back
PnP/heatwrapped exhaust manifold
PnP TD04
Cobb AP stageII
Samco IC hoses
Bosst, OiL temp, Oil press gauges, and kartboy short shifter/bushings

Looking for quick spool and good mid range. Not as concerned with the top end but it's always nice to have. Oh and I know I WILL break my tranny at some point. Im sure my after market warranty company wont cover it, but my dealer rocks so who knows! But when It does Ill probably have our trans guy install some ppgs 1-3 .

Please remember this all in planning stages right now. Nothing is set except the block and heads being torn down. Any comments, opinions, advice, 's, welcome! Thanks

Oh and an a side note: I'm thinking selling the AP and doing the protune and GM BCS hybrid now. This project will not be ready for install for probably 1-2 years . You think its worth doing now and then agian in 2 years? Thanks
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Last edited by BluScubi; 07-26-2008 at 06:35 PM. Reason: add
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Old 07-27-2008, 01:48 PM   #2
MS WRX
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No, with those mods its not necessary. Just find a low mileage stock block.
FYI forged internals do not last NEARLY as long as stock assuming ~stock power levels are being used.
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Old 07-27-2008, 10:12 PM   #3
BluScubi
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Thanks for the response. So I guess the stock internals are good for up to 300whp. What about just installing some ACL or cosworth bearings? Seems the ej205 has a tendancy to spin them. Would these have a shorter life span as well? My reasoning behind going forged was really for peace of mind more than anything. BTW block has 13k on it Thanks
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Old 07-27-2008, 10:51 PM   #4
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Quote:
Originally Posted by MS WRX View Post
No, with those mods its not necessary. Just find a low mileage stock block.
FYI forged internals do not last NEARLY as long as stock assuming ~stock power levels are being used.
so then why would subaru and other car manus used forged pistons from factory on certain models?
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Old 07-28-2008, 12:51 AM   #5
mannac
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Quote:
Originally Posted by MS WRX View Post
No, with those mods its not necessary. Just find a low mileage stock block.
FYI forged internals do not last NEARLY as long as stock assuming ~stock power levels are being used.
care to explain
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Old 07-28-2008, 06:27 PM   #6
BluScubi
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Anybody else have an opinion? Forged internals worth it for my goals? Upgraded bearings enough, or just stick with OEM?
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Old 07-28-2008, 07:29 PM   #7
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your motor will be fiine with those mods. you cant predict when and if rod bearings will fail. keep up on the oil and shift and 7k and youll be fine. also, do some research about gruppe s before you order anything from them. i have several friends who have had very bad dealing with them...
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Old 07-28-2008, 09:56 PM   #8
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Quote:
Originally Posted by AWDWRXLOVER View Post
your motor will be fiine with those mods. you cant predict when and if rod bearings will fail. keep up on the oil and shift and 7k and youll be fine. also, do some research about gruppe s before you order anything from them. i have several friends who have had very bad dealing with them...
+1 for no need to upgrade on that power level... Myself and 100's of people here run that Hp with no problem.. No mobil 1.. No over rev
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Old 07-29-2008, 10:53 AM   #9
jaxscuby
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you'll be fine with stock internals..
287 whp & 262 ft-lbs @ 16 psi
water/meth (aquamist)..
vf30 + supporting mods.
+145000 miles
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Old 07-29-2008, 02:08 PM   #10
BluScubi
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Cool, that means I'm that much closer to my goal! Money wise that is. Thanks for all the replies guys and gals. I appreciate it!
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Old 07-30-2008, 06:17 PM   #11
AWDBoost
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where you gonna get your tune from? AgileAuto? They are good!! Ive dealt with them!
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Old 07-30-2008, 10:54 PM   #12
BluScubi
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Really, I'll have to check them out. Do they use COBB software? Atlantic Motorsports is the only local one I know of that uses COBB. Sucks Andrewtech and TurboXS use UTEC cuz I'm within 10 miles of both!
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Old 07-30-2008, 11:31 PM   #13
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Quote:
Originally Posted by BluScubi View Post
Thanks for the response. So I guess the stock internals are good for up to 300whp. What about just installing some ACL or cosworth bearings? Seems the ej205 has a tendancy to spin them. Would these have a shorter life span as well? My reasoning behind going forged was really for peace of mind more than anything. BTW block has 13k on it Thanks
the stock bearings are fine for what you want to do. Just be sure NOT to use Mobil 5w30 and 10w30 synthetics... They are thinner than advertised, and since they are the oils that 99% of dealers stock, it is what they put in.

Use something along the lines of Amsoil or Redline or other similar product if you are looking for synthetic oils.
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