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Old 07-16-2008, 05:45 PM   #1
EJ20350WHP
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Impreza WRX STi sti build questions

ok im planin on doing a mid build to my sti i was thing on going with a stock forgd crank and forgd 100.mm pistons and rods with a little head work as a midd port job and springs and cams

as anybody tryd a build like this

and what parts do you guys think i should go with thanks.
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Old 07-16-2008, 11:47 PM   #2
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Use the stock rods. They are plenty strong enough. Plus you save money.
Upgrade the bearings for sure.
I'm curious to see how the bc sti cams do. They're almost $300 cheaper than cosworth/kelfords.
Don't forget to add meth injection
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Old 07-17-2008, 12:28 AM   #3
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I'm starting my 2.5L hybrid build in the next few weeks, from what I've read and what's been told to me, the stock crank, rods, and bearings are OK for up to 450-500HP. The pistons should definitely be swapped out for a set of CP's. For the 2.0L heads, a mild port n' polish with Kelford 264/264, Ferrea Enhanced Alloy Dual Springs/Ti. Retainers/Spring Seat Locators/Steel Valve Locks/Valve Stem Seals, and Manley Intake/Exhaust valves.
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Old 07-17-2008, 05:55 AM   #4
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thanks guys you guys are a big help and a nuther thing is.IS the stock sti crank forged or not cus some dude sold me a stock crank but he said it was forged and he ran it for about 13,000 mis..... an so i bot it for a $122.00 dollers he wanted more but i talk him down for the fac that it had a spun bearing so did i get played or not!!!

what kind of hp gains do you think i will have with the build
stock crank, i gess stock rods, forged piston and Ferrea or Brian Crower valvetrain and 272/280 cams port an polish job with meth injection and a Forced Performance Green Turbo compressor housing inlet 3"or jdm ihi vf turbo or a 30R/35R. im lookin for at lest 490 all most 500hp plz tell me what you guys think


if you think there is some better set up let me no
my hole thing is i wont some thing hella fast but reliable its going to be my daily driver
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Old 07-17-2008, 03:07 PM   #5
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I've heard that the BC vavletrain is junk.....if you're going to spend that kind of money already, why not budget a little more and get a Ferrea or Manley setup?
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Old 07-17-2008, 03:10 PM   #6
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so b.c is junk ua ok
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Old 07-17-2008, 03:20 PM   #7
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Like I said, just something that I've heard from a few people that used to have BC valvetrains, not to mention the shop I go to doesn't recommend them at all. Just an opinion, not a fact.
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Old 07-17-2008, 06:02 PM   #8
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Ferrea
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Old 07-17-2008, 08:23 PM   #9
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I have the whole BC setup in my car and it works great, and I just did a JDM closed deck 2.0 with the whole BC setup in it and it is rock solid at 9200 rpm... so where is this magic info coming from??

to the op... what you are doing has been done many times. you also didnt mention whether or not you're using AVCS heads, but since we can assume you're taking the heads off your 2.0, cams are pretty much a necessity for almost any power level. You will have no top end at all without them... been there done that

at the power level you are asking for, I would do the whole works, pistons, rods, cams, valve springs, retainers...

the stock crank is forged, so are the stock rods...
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Old 07-17-2008, 09:01 PM   #10
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thanks dude.but i got a hole sti motor so im thinking on using the sti heads not my 2.0l heads well i was thing on doing the hole swap with the wrx 5-speed tranny motor mild build
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Old 07-17-2008, 09:05 PM   #11
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allright, if thats the case, you can probably get away without upgrading cams and springs, but just make sure you do pistons, rods, and bearings at a minimum...

if you're looking for 500 wheel, a green isnt gonna do it....especially on pump gas... I'd shoot for a a FP red or a 35R
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Old 07-17-2008, 09:11 PM   #12
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and if i go with ferrea what should i buy

Endurance Racing
or
drag racing

should i go stock size or oversize
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Old 07-17-2008, 09:13 PM   #13
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what is better out of the two
FP red or a 35R
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Old 07-18-2008, 01:53 AM   #14
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35r is the better way! plus FP RED you'll need tgv deletes and such. I just got my motor done. BC valve train, BC 272 cams, CP pistons. Cosworth bearings. arp studs... also running the perrin gt35r setup.
break in tune
1st 3000rpm baby slow
2nd 5500 15psi
3rd 5500 15psi (wastegate btw) ocasional WOT
4th 7500 19psi we did a dyno pull 378hp/315tq... still trying to figure out how to use the stupid GREDDY EBC... to get more tq out the motor. Most definetly i need some porting of the heads and tgvs.-
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Old 07-18-2008, 08:35 PM   #15
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are you runing the 2.0L wrx motor or the 2.5L sti motor cuz if you are runing a 35R should your hp be around a lest 450+ and as well as tq power.( just asking)
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Old 07-18-2008, 08:39 PM   #16
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no it's a 05 sti block. thats very debatable. on a dynjet i'd have around mid 400..but this street dyno is dialed pretty closely to a mustang dyno +-10hp
tq is goign to be off since it wasn't a completely flat we were going up hill a lil bit but it leveled off
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Old 07-18-2008, 08:50 PM   #17
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o ok.. a hoo puts out a good 35R kit and can you plz explain to me about (avcs) do i need them or not thanks...
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Old 07-18-2008, 09:17 PM   #18
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(avcs)
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Old 07-19-2008, 12:15 AM   #19
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Active Valve Control System (AVCS) is an automobile variable valve timing technology used by Subaru. It varies the timing of the intake valves by using hydraulic oil pressure to rotate the camshaft in order to provide optimal air flow in and out of the engine. The system is closed loop using camshaft sensors, crankshaft sensors, air flow meter, throttle position as well as oxygen sensors and/or Air-Fuel ratio sensors in order to calculate engine load. The ECU is programmed to operate control valves that adjust the delivery of the hydraulic pressure in order to move the camshaft into the position that will provide the engine with the best performance while minding emissions standards.

AVCS is used on the Version 7 and up EJ207 engines, the EJ255 and EJ257, the second generation EZ30D (2005+ in the USA Market) found in the Legacy Outback, Legacy 3.0R and the B9 Tribeca. A Dual AVCS system utilizes both the intake and exhaust camshafts on the EZ36 found in the 2008 Tribeca. Dual AVCS is also found on Japanese Spec engines, although a complete list of the engines with Dual AVCS has yet to be compiled.
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Old 07-19-2008, 12:22 AM   #20
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Quote:
Originally Posted by EJ20350WHP View Post
o ok.. a hoo puts out a good 35R kit and can you plz explain to me about (avcs) do i need them or not thanks...
GOOD 35r kits? lol they are all good! cause almost all of em uses a garret core
Perrin
Ultimate Racing
Crawford
kingpin

Don't count out stock location bolt ons save ya more money 2!
element tuning i'd say have the best stock location turbos
maybe sz's heard nothing but good stuff
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Old 07-19-2008, 01:08 AM   #21
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thanks on the 35r kit........... but back on the AVCS cuz i wont to put cams but i keep seen non-avcs or avcs and the non-avcs are a lot cheap so what should i do ..
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Old 07-19-2008, 03:24 AM   #22
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Great discription of what AVCS does for starters...

http://forums.nasioc.com/forums/show...php?p=16921135

"Search" >>>> AVCS <<<< Found this in about 15 seconds

I would make a spreadsheet of what the overall costs are going to be for this build before you dive in, I mean if your simply worried about the costs of AVCS cams and not worried about what the extra steps needed to get it are (EX Wiring of the AVCS) .... ... that means you havn't done enough searching.

The questions you are asking seemed to have been answered several times on this board in the past several months, honestly search a bit more...
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Old 07-19-2008, 11:54 AM   #23
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ol boy's right... really you're not going to do any of these mods anyways thats why most ppl ask off the wall questions. spending this kinda of money is no JOKE better research more
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Old 07-19-2008, 04:47 PM   #24
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thanks guys you been a big help
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Old 07-21-2008, 11:17 PM   #25
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i was wondering what is the most horsepower you can get out a subi.and what does the price cost to build a subi to keep up with the american muscle.
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