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Old 02-14-2006, 07:59 PM   #1
tribaltalon
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Default rebuild stock block, STI motor, or cobbs 2.5 shortblock?

alright, my buddy took his car to the dealership, and indeed, he blew a rod. so you guys were right. now he's trying to figure out what would be the best bang for the buck option now. either rebuild his block with some forged internals, get an STI motor, or get the cobbs stage 1 block.. what do you guys think would be the most bang for the buck option? thanks.
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Old 02-14-2006, 08:03 PM   #2
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JDM 2.0L Ver. 7 or 8, or USDM STi block, JDM about $1200, USDM about $1050 if you search, don't rebuild the open deck is weak.
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Old 02-14-2006, 08:06 PM   #3
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Quote:
Originally Posted by SubyDuz
JDM 2.0L Ver. 7 or 8, or USDM STi block, JDM about $1200, USDM about $1050 if you search, don't rebuild the open deck is weak.
I've NEVER seen a USDM 2.5l STi shortblock for $1050. Tell me where and I'll buy one now!
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Old 02-14-2006, 08:13 PM   #4
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i want one to show me
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Old 02-14-2006, 08:14 PM   #5
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It depends on what you want...JDM ver 7 or 8 have a high rev limit, but the STI block is a torque monster. I would probably not spend the extra money on the Cobb block, thats just me.
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Old 02-14-2006, 08:16 PM   #6
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New sti shortblocks are around 1700. I think thats really the way to go, never know what your getting in a used block.
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Old 02-14-2006, 09:22 PM   #7
tribaltalon
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Ok so I'm the buddy who blew the motor....yeah it sucks. Anyways, the car was a 2002 Wrx with Cobb stage 2, My question is if I go with the sti block how would it work with the stock 2.0 heads, transmition, feul pump, turbo, accessories, Ecu...etc. etc.....I know alot of sites claim that the block works with the stock wrx heads, but I really have no idea. I really don't have endless funds to rebuild the entire car haha. I guess my question is if i go with a 2.5 block what neessary parts have to go with it. Or would it just be more practical to go with a 2.0 block. THANKS
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Old 02-14-2006, 09:26 PM   #8
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Quote:
Originally Posted by SubyDuz
JDM 2.0L Ver. 7 or 8, or USDM STi block, JDM about $1200, USDM about $1050 if you search, don't rebuild the open deck is weak.

yea, it only held 520.7whp w/ a GT35R



must be that puerto rican air.


cheapest would be STi rods and forged pistons for your motor. 2nd cheapest would be used ej205 (prolly a longblock, never seen anyone sell just the shortblock), or a JDM motor. STi shortblock is like $1500ish from the dealer IIRC?
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Old 02-14-2006, 09:32 PM   #9
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sti v7 or v8 block. about 1200.
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Old 02-14-2006, 09:37 PM   #10
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Quote:
Originally Posted by tribaltalon
Ok so I'm the buddy who blew the motor....yeah it sucks. Anyways, the car was a 2002 Wrx with Cobb stage 2, My question is if I go with the sti block how would it work with the stock 2.0 heads, transmition, feul pump, turbo, accessories, Ecu...etc. etc.....I know alot of sites claim that the block works with the stock wrx heads, but I really have no idea. I really don't have endless funds to rebuild the entire car haha. I guess my question is if i go with a 2.5 block what neessary parts have to go with it. Or would it just be more practical to go with a 2.0 block. THANKS
People are having pretty good results using sti block with the wrx heads. You keep your wrx ecu. Everything bolts up to it. The stock turbo is gonna be exhausted with the extra half liter displacement so maybe you should think about going cobb stage 2.5. Your compression is gonna be slightly higher using the wrx heads, but you could fix that with your headgasket thickness. I think the 2.5l is the way to go, maybe if you have some extra cash drop a set of mahle pistons in it and you have yourself an extremely strong motor. Keeps us updated and good luck .
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Old 02-14-2006, 09:40 PM   #11
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where in the world are u guys getting prices for this stuff? i JUST looked into a v7 for my car and it would be over 10 grand at almost like 5 different places i checked.
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Old 02-14-2006, 09:47 PM   #12
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Quote:
Originally Posted by tribaltalon
Ok so I'm the buddy who blew the motor....yeah it sucks. THANKS


no, thank you. . .for owning up finally.

with limited funds you may want to look for a used short block USDM 2.0L. If you have very limited funds, upgrading to a 2.5 or JDM block shouldn't even be in your cards. . .the USDM blocks will last a long time if cared for and tuned properly.

2.5's aren't much, but you may hassle a little matching heads, then you may lay waste to your tranny with the extra TQ.

JDM 2.0L's are not 1500 new. . .
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Old 02-14-2006, 09:48 PM   #13
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Where the hell are you looking??? www.subarugenuineparts.com There a vendor and they have sti shortblocks for like 1600 or so. Also search vendor for sale forum and you will find tons of jdm and usdm shortblocks for between 1000-1700 or so
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Old 02-14-2006, 09:55 PM   #14
tribaltalon
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lol just to clear this up, i left my account logged on at my friend's house, my friend is the one who just replied and said he was the one who blew it up.. i dont know why he's not using his account.
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Old 02-15-2006, 12:41 AM   #15
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A 2.5 would be a great way to go, especially with new pistons, but it in no way is cheap according to most people's definition of cheap. If you said limited funds, its probably not your style. To match up the heads, you will probably just need to do a bit of resurfacing to match better, about $120. If you went for a rebuild with pistons, it'd be $2k in labor, $2350 in parts. Roughly.
Without forged pistons you would expect about $1700 for the parts, and $1800 for labor. You'd need new gaskets though and any builder would probalby recommend APR head bolts for $220.

I'm inferring these numbers off of my receipts in case you were wondering where they came from.
I think if you wanted to go really cheap, of course you could buy a used ej205 shortblock, but why? You'd have no idea what you'd get and run the risk if doing the same thing you did again. If its cheaper and feasible to rebuild the internals on yours, do that. I have no idea what that costs, just thought I could give you numbers on the 2.5 USDM STi block with WRX heads
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Old 02-15-2006, 06:32 AM   #16
HerculesPeanut
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Quote:
Originally Posted by norexyet
Where the hell are you looking??? www.subarugenuineparts.com There a vendor and they have sti shortblocks for like 1600 or so. Also search vendor for sale forum and you will find tons of jdm and usdm shortblocks for between 1000-1700 or so
If you really want to convince people, a direct link is typically the way to go.
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Old 02-15-2006, 09:30 AM   #17
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Quote:
Originally Posted by nsucdm_wrx
It depends on what you want...JDM ver 7 or 8 have a high rev limit, but the STI block is a torque monster. I would probably not spend the extra money on the Cobb block, thats just me.
I thought that the rev limit was more a function of the heads / valvetrain than it was the block?

People spin the STi engine well over red line, IIRC, it just does not flow well enough to make power up there.
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Old 02-15-2006, 10:57 AM   #18
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Quote:
Originally Posted by VWGrk1
I thought that the rev limit was more a function of the heads / valvetrain than it was the block?

People spin the STi engine well over red line, IIRC, it just does not flow well enough to make power up there.
A lot more to it than just the heads. The bearings have to be able to take the abuse, also crank lubrication becomes an issue at a certain point.
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Old 02-15-2006, 04:53 PM   #19
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Quote:
Originally Posted by stevebennett
A 2.5 would be a great way to go, especially with new pistons, but it in no way is cheap according to most people's definition of cheap. If you said limited funds, its probably not your style. To match up the heads, you will probably just need to do a bit of resurfacing to match better, about $120. If you went for a rebuild with pistons, it'd be $2k in labor, $2350 in parts. Roughly.
Without forged pistons you would expect about $1700 for the parts, and $1800 for labor. You'd need new gaskets though and any builder would probalby recommend APR head bolts for $220.

I'm inferring these numbers off of my receipts in case you were wondering where they came from.
I think if you wanted to go really cheap, of course you could buy a used ej205 shortblock, but why? You'd have no idea what you'd get and run the risk if doing the same thing you did again. If its cheaper and feasible to rebuild the internals on yours, do that. I have no idea what that costs, just thought I could give you numbers on the 2.5 USDM STi block with WRX heads
Quote:
Originally Posted by norexyet
People are having pretty good results using sti block with the wrx heads. You keep your wrx ecu. Everything bolts up to it. The stock turbo is gonna be exhausted with the extra half liter displacement so maybe you should think about going cobb stage 2.5. Your compression is gonna be slightly higher using the wrx heads, but you could fix that with your headgasket thickness. I think the 2.5l is the way to go, maybe if you have some extra cash drop a set of mahle pistons in it and you have yourself an extremely strong motor. Keeps us updated and good luck .
I completely agree with these two comments. We have done more 2.5L SBs w/ WRX heads in the last few months than I can count off the top of head. These motors make loads of torque and the WRX heads are fine with this SB. If you can afford it, this is definitely the way to go. The price of a 2.5L SB is very close to the price of a 2.0L SB. The numbers that we see from this hybrid combo are very close to the USDM motor numbers; most of the difference is in midrange torque (because of the STi's AVCS heads).

Also, I think our stage 1 2.5L SB is an excellent value. While a brand new 2.5SB is about $1700 our stage is $2599 but you get Wiseco forged pistons, race bearings, and balancing to within 1 gram (JDM STi motors are balanced to within 7 grams). The pistons and bearings are utilized because 90% of blown STi motors that we see have problems with one of those two parts. If you were thinking about doing pistons anyways ($500 for pistons, $300 for intstall), then an extra $100 for bearings and balancing is a serious basement bargain. This is essentially a bulletproof 2.5L shortblock for anything up to 535CHP (more than a Green, 20G, or GT30R (on pump gas) can throw at it).

Thanks,

Geoff
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Old 02-15-2006, 06:08 PM   #20
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Question to the thread starter... how did your buddy blow a rod with Stage 2?! Poor gas + non custom-tuned off-the-web EM Cobb map?
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Old 02-15-2006, 06:25 PM   #21
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OK, Ill throw my head in for the slaughter here. Wouldn't a thrown(?) rod typically be a result of over revving assuming no defective parts were involved?

I'm not making accusations just generalizations here.
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Old 02-15-2006, 06:43 PM   #22
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...and I suppose Cobb's stage 2 map still have the rev limiter set?
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Old 02-15-2006, 07:03 PM   #23
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check ebay for new 2.5 blocks. i've seen for 1499 buy it now and like 100-150 s/h. no tax and stil a lil cheaper than dealers want. it was from a dealer too. subaru of gwinette in georgia i believe. hope it helps!
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Old 02-15-2006, 08:16 PM   #24
tribaltalon
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we still do not know why the car threw a rod.. and yes it does have a rev limiter on it.. he didnt over rev the car.. i was with him. no idea why the car blew.. could have been a combo of bad gas and running lean, but he bought the car with the stage 2 on it already so its hard to tell exactly what it is.. the previous owner might have beaten the crap out of it and the motor was just on its way out. i only managed a 14.2 out of the car, might have gotten a high 13 if i hadnt spun so much but i still pulled a 1.9 60 foot spinning like crazy. he's lookin at blocks right now to decide what he goes with. should end up bein a real nice fast wrx.
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Old 02-15-2006, 08:40 PM   #25
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Quote:
Originally Posted by JasperSTi
yea, it only held 520.7whp w/ a GT35R



must be that puerto rican air.


cheapest would be STi rods and forged pistons for your motor. 2nd cheapest would be used ej205 (prolly a longblock, never seen anyone sell just the shortblock), or a JDM motor. STi shortblock is like $1500ish from the dealer IIRC?

No kidding really I can read the threads too, I have a 2.0L JDM STi shortblock because it can handle 500whp...duh
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