Mustoe91

iTrader: (2)

Let's start by saying this may not happen just weighing up my options at the moment. Currently running a enginetuner GT3076 and it's very laggy on my 2.0 so seeing what turbos are about that are quick spooling suit my spec and will deliver over 400bhp

My turbo is currently running 426bhp and 407ft lbs and comes in around 4500rpm with hell of a kick would ideally if I changed turbos would like to run the same type of power but a quicker spooling

Brief spec of car may have missed a few bits out

2.0 semi closed deck block
Jdm big port avcs heads
11mm head studs
Omega pistons
Max speeding rods
Killer b baffled sump plate
12mm oil pump
Rcm head gasket
Rcm oil cooler
Rcm stainless headers
Japspeed frontmount
Engine tuner gt3076 58mm comp wheel 55mm turbine wheel
650cc injectors
Ngr iridium spark plugs
340ph fuel pump
Alcatek Ecu als and lc active
3" decatted turbo back exhaust
Cone filter


I'm aware of sc42 and a few other turbos but thought I'd post this on here for a few ideas

Cheers

bustaMOVEs

iTrader: (31)

Sc42 without a doubt, it's a good turbo for that goal especially with Jdm big port avcs heads it will just pull, I was going to change to a 500 turbo but I think I'll stick with it, for that reason I sold it and now going to buy another as it was an angry little turbo and perfect for spool and sprinting like drive.
Thumbs up from me, I was considering the precision turbo, mdx321v etc but NO, I'm sticking with sc42 as there's not much like it for that goal area that drives excellent

imprezagaz

iTrader: (2)

Sc46. On my old ej207 2.0 with big port heads and supporting mods it hit full boost 1.65bar just under 4K. Now on my 2.1 it is about 3400. The sc46 hits full boost 300-400rpm slower than the previously fitted sc38 on the 2.0 engine

Mustoe91

iTrader: (2)

This is what I got when I done some research every body saying how good sc range is but surely there's more options out there ? Garrett ? Turbo technics ? Precision turbo ? Owen development ? Want to cover them all and look into them all before I decide where I want to go

SmurfyBhoy

I'd say pretty much any "Real" 400bhp on any stock 2.0 block will be lucky to make 300ft lbs by 4000,

Would be interested to see otherwise....

I have an sc42 that got remachined for bigger billet wheel by owens on my car

Really be suited to a larger engine, higher compression or both to get the most out of it.

Being able to rev out more would benefit if you wanted to widen the powerband up top #JDM yo !

I'm sure Blouch do a GTx28 based turbo for the STI just havent seen any results, not sure the power limits of a Gtx28 either

Twinscroll would help too

Mustoe91

iTrader: (2)

Looked into twin scroll but a lot of effort to change when I'm already single scroll may send a few emails off to company's and see what response I get as I don't wanna rush it happy with my current turbo just have to drive it hard to get the best out of it

imprezagaz

iTrader: (2)

imprezagaz

iTrader: (2)

That was with exhaust restriction and standard recirc valve diaphragm passing

SmurfyBhoy

Yep, as expected similar to mine,

Dead below 4k but a monster afterwards,

Drove a golf r the other day and it put it into perspective what low down power on a 2.0 really is.

Wasn't very exciting but certainly got up and went,

Has anyone looked into a GT28 based setup ?

Tidgy

Not that great on a 2.0, works well on a 2.5 though. Although depends on what it is of course

SmurfyBhoy

Are you talking about the GT28 ?

Surely it would be more suited to a 2.0 than a GT30 based turbo like the SC42/46 n MDseries ??

Can't find any real reviews of them from anyone who actually used one ?

Tidgy

I may be getting my wires crossed then as to which it suits.

I'm on a 2.5, v5 heads with gt2871R billet, and works really well, runs out of puff top end though.

SmurfyBhoy

An example would be this

http://www.bptstore.com/Subaru-WRXST...er-_p_131.html

A ball bearing 16g equivalent,

http://www.bptstore.com/Subaru-WRXST...er-_p_122.html

A ball bearing 20g equivalent,

The two turbos above are both smaller than this one and therefor should spool better, while sacrificing some outright topend power.

http://www.bptstore.com/Subaru-WRXST...rger_p_25.html

Which i am sure is similar to what we buy as an SC 42



As we know the SC42 & 46 use GT30 based cores,

Those ball bearing 16/18 & 20g should outspool them both.

SmurfyBhoy

Looks torquey low down eh,

Would avcs heads improve that further still ?

is that 315 "W"HP at around 2 bar peak ?
Same run 398 at fly ?

Tidgy

yeah, although it seems to run out of puff as you go up the rev range, which kinda makes sense when it drops from 465ftlb to 398bhp.

The honest answer is not sure, the v5 are equivalent big port so I'm told so wouldn't get a benefit from that, its also running supertech valve kit but i dont think it had any porting done (had to have new valve guides and valve seats sorted etc when the engine was rebuilt). I'm up at clinic on sat so can have a chat with Pat if he's up there.

Yeah both run .068 (file name give the run number) and as said 315 at the wheels, 398 at the fly at roughly 2 bar.

Full build is here - http://uk.subaruownersclub.com/forum...roject-type-r/

SmurfyBhoy

Perhaps it would be more suited to 2.0 then,well at least more suited to it than a sc42 surely ?

How does your Gt28 compare to a SC42 on the 2.5 have you had em both on the same setup or at least close ?

Just thinking as it wont run out of puff as quick on a 2.0, but obv wont spool as good either

Tidgy

Not had a 42 for comparison im afraid. Had a 46 on my old engine, but that was a wrx with single avcs heads, and was nearer to stock than my type r is. STI top mount, stock ecu etc. My type r is on a front mount and syvecs.

Graphs of my old one, but prob a few version old of the 46 and not sure how comparable it is being a very different spec.

SmurfyBhoy

So they are also on a 2.5 just closer to stock ?

390 bhp at around 21 psi ? and pulls all the way to redline

bustaMOVEs

iTrader: (31)

I'm pretty sure the sc42 is the equivalent to that 20g above but a smaller housing is used designed for a 2.0, and then that 1.5xt dom is more for the 2.5s as used in America hence popular so similar to a sc50 etc?

Tidgy, isn't yours a custom 28 based using a smaller housings specifically designed for spool as was made for their rally car? Hence runs out of puff, a genuine 28 will see over 400hp?

SmurfyBhoy

Yea but if you read they say they designed the Dom 1.5 for uk guys with the 2.0 so even the sc46 wouldnt really be that one,

If it is the Ball bearing 20gxtr thats equal to the 42

then how about the 18g xtr i bet that wouldnt be too far off

Im sure blouch put a 7cm on the SC ones,

You can spec it like that from them too

Tidgy

yes matey, the sc46 is the near stock one.

yep, was kept low boost though so had plenty more to come

Tidgy

The housing is availble off the blouch website as one of the options, but mine has a custom turbine, sorry if that wasn't clear.

Tidgy

One of the issues with the SC series when you try to compare them is they change frequently, by that i mean they are an evolving entity with different specs and changes in housing etc, so it's hard to pin down exactly which housings are used not to mention the changing in wheel design.

So a sc46 from a couple of years ago will be a very different animal to one form this year.

IIRC the one on my old wrx was an early SC46+. But as you can see from the dates were going back a few years and my memory isn't great haha

domino46

had so many SC turbos fail ill never buy one again

SmurfyBhoy

So are you telling me SC don't just buy a blouch and stick a 7cm hotside on it ?

Are you saying they actually buy these Blouch turbos, then strip fit their own spec wheel and rebuild and balance ?

I'd have thought theres more chance they just mix and match from what appears to be a lego list of parts,

16/18/20g/dom1.5/dom2

each available with either 7cm/8cm/10cm hotsides

16/18/20g can be journal or ball bearing too

Tidgy

Nope, Blouch build them to clinic spec so housing can be bought via the website but it's a custom wheel spec.

As they are developed they get shipped back and fourth, not every change works so some don't even see the light of day. I remember being up there a couple of times when they had ones that just don't work, either laggy or don;t do the numbers.

SmurfyBhoy

If this is true why would Blouch not advertise said "custom" wheel spec on their site for all the JDM EJ207 owners in the USA ?

Surely they don't just make a UK turbo ? Such a small market to invest in...

Just curious not knocking the clinic just makes no manufacturing sense ?

bustaMOVEs

iTrader: (31)

I'll check my box, can't remember now lol

bustaMOVEs

iTrader: (31)

46s?

Tidgy

I would guess it depends on agreement in place.