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Old 02-06-2006, 04:36 PM   #1
kheff46
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Member#: 66739
Join Date: Jul 2004
Chapter/Region: MWSOC
Location: Medina, Ohio
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2002 WRX wagon
silver

Smile v4 info and build options

my new swap is a Ver4 sti clip (thanks supermoose!) but is yet to arrive actually. so here's the novel i wrote!
im not gonna build a franken motor this year, but would like to arm myself with some info. this is FI frankenstein territory, which i never contemplated initially(except ej257 block with 2.5 na heads). but i'd like to know if possible what kind of flow the v4 heads have compared to anything else if you have some reference handy. and crank/block options for strokers. i've seen plenty of 2.5 blocks with 2.2 heads/1.8heads(n/a of course), and reverse for FI.and this block with that crank and these rods, blah, blah! but what are the options for this specific block. i'm unsure of the bearing type in the bottom end, and if the crank is essentially the same stroke as the usdm wrx(just better?)? id like to know more about my new engine before i blow it up and have to rebuild superfast with zero options in mind. if there are similar(v2-5) hybrids you've heard of or have built with success i'd love to hear it! -heff
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Old 02-06-2006, 04:39 PM   #2
Jaxx
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the engter key is on the right side of the keyboard
for reference
ver 0-2 ej20G
ver 3-4 ej20K
ver 5-6 ej207

i believe mykrr is running a ej20k w/ a ej257 bottom end and a powerfc
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Old 02-07-2006, 09:55 AM   #3
kheff46
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i know, i know! i just get carried away with what is in my head needing to get typed! thanks! i was thinking that build for displacement, torque, availability. but some importer guys think 2.0 is teh way! i dunno, i'll keep thinkin bout it! -keith
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Old 02-07-2006, 11:02 AM   #4
Matt Monson
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Something to consider is that your v4 bottom end is phase I and has a center thrust bearing. If you were going to use that block for a stroker, you would want to
A. use a phase I Ej22T or Ej251 crank, or
B. get someone like Cobb,Crawford or Axis to rebore the block for a phase II crank.

That said, if you want more displacement, I don't see any reason to use anything other than an Ej257 bottom end. It will be the most cost effective and reliable. If you want something unique and different, then go for the stroker set up. But you are going to spend $4000 on a block when a $1500 STi block will do the trick...

Oh, and of course, this puts you back into the engine management portion of things. You will need a PowerFC, or some other tunable EM to do this.

On the V4 heads, they flow really well. I don't have the hard numbers, but I can tell you the ports are huge. Heads will in no way be a limiting factor on this build. Getting the right turbo for what you want to achieve is the single most important piece of the whole puzzle...
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Old 02-07-2006, 12:13 PM   #5
kheff46
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i waqs think ej257 the whole time. even b4 the v4 clip was purchased. reluctance to rev is the only bad thing i hear about the ej257(heresay afaik). and what would you suggest for turbos at that point? i know nil about suby specifics, besides what i've heard round here. any ideas for great streetability and track worthiness(daily driver not tuner is my goal). thanks matt! -keith
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Old 02-09-2006, 11:25 AM   #6
grnlantern1
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I just had my Version IV STI RA rebuilt by Techworks and if you had any technial questions they might be able to help you out..Techworkseng.com I belive is the web sight...Tom is the main mechanic an dis very knowledgable about subie engines...

Ron
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Old 02-09-2006, 12:10 PM   #7
Jaxx
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well what do you want if you have enought $$ you could do a gt30
but it will need the supporting mods
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Old 02-10-2006, 09:50 AM   #8
kheff46
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jaxx- someone else mentioned that as well. definately considering, but not sure what $$ it'll take. any clue personally? i see your ej20g and wonder what you run currently?

grnlantern1- what kind of build did you go with? curoius for sure!

i don't see too many v4's round here and would like to hear from those who've built one personally or similar(g's, k's) model motor.
i'd like as little lag as possible being a daily driver, but i know i'll get bored with only 280hp. sounds dumb, but i can see it now! -keith
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