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Old 09-15-2007, 02:17 AM   #1
CGM/WRX
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Default JDM V8 STI motor questions

I have the chance to get a JDM V8 STI short block at a good price. I already have a set of complete JDM V8 STI heads. My Question is that I have a 05 WRX and was wondering if every thing on my WRX motor will bolt up and work on the V8 motor. I know the headers and intake manifold will bolt up but will the other things like the PS pump for example work. Because I know that the PS in a 02-03 WRX is different than one in a 05 wrx like mine. Any help would be gladly appreciated.

Thanks,
CGM/WRX
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Old 09-15-2007, 11:45 AM   #2
ejh25
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Quote:
Originally Posted by CGM/WRX View Post
I have the chance to get a JDM V8 STI short block at a good price. I already have a set of complete JDM V8 STI heads. My Question is that I have a 05 WRX and was wondering if every thing on my WRX motor will bolt up and work on the V8 motor. I know the headers and intake manifold will bolt up but will the other things like the PS pump for example work. Because I know that the PS in a 02-03 WRX is different than one in a 05 wrx like mine. Any help would be gladly appreciated.

Thanks,
CGM/WRX
I would go with a 2.5L block with those heads. You need V8 valve cover gaskets, valve covers, bolt seals, timing belt covers, and to make your life easier you really should get the V8 riser-less intake manifold so you don't have the headache of fitting fuel rails in tight places. Buy a Hydra so you can run AVCS.

Trust me...this stuff gets very very expensive fast.
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Old 09-15-2007, 03:27 PM   #3
CGM/WRX
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Yea I have all the gaskets,bolts,timing belt cover and misc. stuff. I was also going to get the JDM long runner manifold that is one piece. Its top feed and comes with the fuel rails and throttle body as well. I have heard good things about the 2.5L's but Im not that big of a fan of them. I like how the JDM 2.0L has a semi-closed deck,forged internals,higher compression and can REV like none other as well as have a better top end. Please correct me if im wrong or if I am over looking something.
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Old 09-15-2007, 03:40 PM   #4
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I am interested in doning something similar to this too so i will keep an eye on this thread.
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Old 09-15-2007, 03:53 PM   #5
dingobite
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Ive been thinking about the same build for a while, on my next subie if i ever get around to buying one only i want the Avcs.

If you want to search through endless pages of junk here theres a video of a guy auto crossing with the build JDM 2.0 will suposedly spool any turbo faster with a high compression number on plain jane wrx heads.
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Old 09-19-2007, 01:23 PM   #6
ejh25
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Quote:
Originally Posted by CGM/WRX View Post
Yea I have all the gaskets,bolts,timing belt cover and misc. stuff. I was also going to get the JDM long runner manifold that is one piece. Its top feed and comes with the fuel rails and throttle body as well. I have heard good things about the 2.5L's but Im not that big of a fan of them. I like how the JDM 2.0L has a semi-closed deck,forged internals,higher compression and can REV like none other as well as have a better top end. Please correct me if im wrong or if I am over looking something.
You are right...the JDM 2.0 can rev higher in stock form compared to a EJ257 in stock form. The bump in compression with 2.0 heads on a 2.5L block with OEM gaskets along with the added displacement of a 2.5 makes for a torque monster that IMO is a much better option than the higher reving JDM 2.0L block.

- Eric
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Old 09-19-2007, 04:17 PM   #7
phlegmon
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Sorry, but the V8 EJ207 has hypereutectic CAST pistons. V7 EJ207 was the last 2.0 to have forged pistons. The rods are forged. The crank is forged (with better oiliing than the 2.5 crank). Of course, the EJ207 engine rotating assembly seems to be much better balanced than the super-mass produced EJ257, so the EJ207 is much more rev friendly.
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Old 09-19-2007, 05:23 PM   #8
ejh25
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Quote:
Originally Posted by phlegmon View Post
Sorry, but the V8 EJ207 has hypereutectic CAST pistons. V7 EJ207 was the last 2.0 to have forged pistons. The rods are forged. The crank is forged (with better oiliing than the 2.5 crank). Of course, the EJ207 engine rotating assembly seems to be much better balanced than the super-mass produced EJ257, so the EJ207 is much more rev friendly.
Good to know.

My feeling is that the torque and response are more of benefit than the extra 500-1000 rpm...I guess it really depends on what turbo you want to run and what you are really looking for out of the setup.

- Eric
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