Paulos09

Hi guys first off I'm just going to say I dont have a standard scoob and want 1million bhp for £30 lol this is a a serious post looking for some proper help so please read threw and any help will be appreciated on squeezing more bhp out of it :-)

Right I have a turbo 2000 with a ej20 engine with the following mods so far
Forged pistons,Manley forged rods , acl race bearings 880cc injectors, scar fpr, walbro 255 fuel pump, lightened flywheel, lightened pulleys, td06 20g turbo, FMIC, 2.5 inch tubular stainless steel manifolds, 3 bar map sensor, 3.5 inch decat to 3 inch exhaust, simtek ecu , center feed fuel rail for equal distribution , k & n air filter, 12mm oil pump ,phenolic thermal manifold spacers 8mm I think, and a 6 paddle clutch, short shift,forged 5 speed gear box and LSD rear diff , standard cams and standard heads, it run a 421.6 bhp on the dyno with open deck blocks and 0.6mm head gasket at 18psi , anyway the block twisted so currently rebuilding with closed deck blocks which have all been rehomed to standard 92mm bore I believe and it's due to go back on the dyno next month

I want more power and I'm after help on what small bits I could do y the blocks apart to get the most out my setup ,I don't want to stroker it just yet all tho I have thought about it but that's another £1200 lol

What size head gasket would you recommend for more boost I was thinking the 1.6mm stainless steal 1s but I'm not 100% was thinking about cams too but I dnt realy Wana chuck another 2k at it with the head gaskets n dyno Ect it's allready going rob me of another £1000 lol so please any advice would be realy appreciated

Paulos09

Just before people say about handling n breaks it's got anti roll bars full adjustable coil overs brembo 4 pot upgrades Ect Ect lol :-)

MRSIMPSON

iTrader: (2)

Car sounds awesome, and pictures?

Mark10sti

iTrader: (2)

Good specs there mate, gonna need a new box soon mine kept popping 3rd

scoobyJim2

Even though he already has a forged one?

beardo47

Spell check OP

Kwik

iTrader: (10)

Turbo 2000 heads iirc are hydraulic are they not? It might be worth sourcing some V3/4 heads with shim under bucket clearances and an aggressive cam profile. Or even as you have a Simtek AVCS heads are an option for you.
I think the TD06 maybe maxed out at that power as well.

Paulos09

Well I hope there's still more get out the td06 as only running 18psi want to take it to 22-24 psi that's my question about head gasket thickness to run more boost safely , and as for heads n cams I don't really won't to spend loads more at the mo £2-300 max just to maximise what I have , and as for gearbox whats the best gearbox to go for then if this 1 does **** it self :-) many thanks and I hope to post a few pics tonight of the rebuild :-)

Mark10sti

iTrader: (2)

Ah yes missed that mate oops

Mark10sti

iTrader: (2)

Do you know what has been done to the box to forge it, I am intrigued

Paulos09

I'm not 100% on the gear box as it was bought second hand I believe it had a whole new gear set with a few less teeth on the gears to ad strength Ect :-)

wms-racing

If you were running std head bolts you probably lifted the heads, you will need a set of arp studs. If you tell us your power target I can advise as much as I know. You will need V5/6 sti heads to get up to 500bhp, stick with 0.6 gaskets for std compression (unles the block or heads have been skimmed ( you will need to cc it to get an accurate C/R). If you want to go over 500, things get more expensive- valves/cams etc.

scoobyJim2

Paulos09

Heads have been skimmed and polished it had arp headbolts, studs ill look into and does the sti heads have a diffrent inlet manifold ??

wms-racing

The heads are essentially the same as yours but they have better cams, they are a direct fit. perhaps go a bit thicker on the gaskets 0.9/1.0 to drop the cr a bit, the new RCM gaskets are very good, i'm running 10.5:1 on my rally car with them @1.7bar :-) it does have 14mm studs though

Paulos09

Direct fit mmmmmmmm tempting then think ill have shop about see if I can get a set cheap enough it would make sence, so from the set up I have with closed deck block plus sti heads n cams pluss 1mm heag gasket plus extra boost head studs ect what sort of bhp u recon roughly it would bring I know untill its on the dyno its any 1s guess but want to weigh up the possable gains vs cost :-)

wms-racing

That setup is capable of 500bhp, its the other stuff that will get you there of course, turbo/injectors, exhaust manifold + system, good flowing frontmount etc.

cookstar

iTrader: (6)

What's a forged gearbox?

Paulos09

Cool cool so the version 5/6 heads would be from a 99 sti ? And are u sure it's a direct replacement no other stuff is needed? :-)

wms-racing

yes and yes

Paulos09

Cool right time to make some phone calls :-) many thanks for the help :-)

scoobyJim2

Is it only sti's with avcs/active valve control sytem that require a different inlet manifold. Because when I asked my builder to fit the red sti manifold to my forged wrx he was building for me he told me the heads are different on sti's so sti red inlet manifold won't fit wrx heads. Maybe he was talking about the inlet manifold from a sti with avcs won't fit my 04wrx not an older version 5/6 sti inlet manifold?

Paulos09

No luck on finding heads today , so will the sti v5/6 heads be a direct fit on to a ej20 turbo 2000 closed deck block because a few people have said it will require a different inlet manifold :-/

Paulos09

What cars are they on is it just a 98-99 impreza or they in a legacy or forester ect im past my knoledge when it comes to scooby heads would it better/cost effective to just swap out tbe cams????

wms-racing

The heads you want are on the V5/6 sti or P1, version 1-4 are differnt and your inet won't fit as the stud pattern changes after 1998 (V4, aka phase 1.5)
After that all the inlets will fit (bolt pattern) although there are differnt wiring/coil setups.
A new age sti inlet will fit your engine.

jason_2013

Am I missing something here? I can't see anything on this thread written about what year this turbo 2000 is? So what version heads you need will depend on that missing information

wms-racing

Good point, lol. Ive assumed it's V5 as it has 0.6mm headgaskets, this may of course be wrong, but they would be the wrong thickness for V1-4

Paulos09

Sorry not replied been away, anyways after searching for different heads I've give up lol does any 1 know what sort of cam upgrades are about cheap as I dnt won't to chuck another load of cash at it and how do u post pics on here as I've took some yesterday as I started putting the block back together :-)

jason_2013

What year is your car? If a v5/6 Try using legacy gtb heads from the 99-2003 legacy twin turbo facelift and use better cams and valves in them. The ports on those heads are bigger than impreza sti heads. I'm currently building some like that but using standard sti v6 cams valves and under bucket shims, but I'm not going for 500 bhp only around 400+ The heads are a direct swap only needing the left cylinder head turbo oil drain, oil feed and water outlets blocking off.

BHPvstorque

iTrader: (14)

May have a set of ver 5 Sti heads soon just trying to figure out where I put then too many bits ha ha also have a set of avcs heads and loom possibly up for sale soon. Has the usual hairline cracks but they have Bern decked and a fine.