So I've been looking at a few blouch turbos.

TD05 16G Billet Ball Bearing https://www.oakos.com/BL-16GXTR-7CM.htm
TD05 18G Billet Ball Bearing 8cm Housing https://www.oakos.com/BL-SUB-18G-XT-R-8.htm
TD05 18G Billet Journal Bearing 7cm Housing https://www.oakos.com/BL-TD05H-18G-XT.htm
Dominator 1.5XTR Ball Bearing https://www.oakos.com/BL-DOM1-5XT-R.htm

Also:
Tomioka GTX 2971R Billet Ball Bearing https://www.oakos.com/TR-TS1045.htm
Tomioka TD05 18G Billet- Journal Bearing https://www.oakos.com/TR-TS1000.htm

The aim is for 330-350/330-350, however If I do want to push for 400/400, I don't want to have to upgrade the turbo again.

Its a version 4 type r, so I want to keep good spool and good torque, its a road car and wont see track days.

Will be running FMIC, Fuel Reg,340 fuel pump, 550cc or bigger injectors, 3" turbo back exhaust.

Will be mapped on 95ron, as its only available petrol in ireland

 

400bhp will put a good amount of strain on the 5 speed gearbox and you will be hard pushed to maintain that torque on a standard block...If you could get their with just bolt on parts in the first place?!?.Me personally i would be looking at a more sensible 350bhp and work up from their unless you already have a fully forged bottom end?!?Always get the smallest turbo for your planed bhp max total if you are looking to maintain drivability with a fast spool up,as you said that its going to be a road car,also think of a upgraded clutch.SJ.

 

Well my aim is 330-350, Ive an exceedy stage 1 organic clutch also.

But what I mean is if I want more power I don't want to have to upgrade the turbo again.

I've also just been told elsewhere to go for the td05-18g journal bearing with the smaller 7cm housing.

 

If you are going to upgrade your turbo really you should be looking at a billet roller bearing turbo for a much quicker spool up and better efficiency,who recommended you a journal bearing turbo?he was pulling your leg...journal bearing technology is old hat.SJ.

 

I think he was referring to the smaller 7cm housing on the journal bearing vs the 8cm on the ball bearing one.

Maybe they can do a 7cm housing ball bearing td05 18g with a billet wheel

 

I cant really advise on a specific turbo with the ones that you listed as i have not driven a Subaru with one of them fitted,but if you are looking a turbo too spool up quick and still have room for more power in my opinion it will have to be a quality variant of a billet roller bearing turbo to future proof and have more longevity/reliability.SJ.

 

Well its some pointers to take on board.

What housing size should I stay for the 2.0?

 

Just been reading the links that you supplied...from the specs and for your set up that top turbo that you listed the 16G would be more then enough for the road and for the mods that you are thinking of fitting and still have the potential for more power without being to big to delay spool up,with Subaru’s if you have a good mapper your planed engine mods will fall into place and be safe to use so think of the mods but make sure that your number one priority is getting a mapper that can bring everything together.SJ.

 

speak to scoobyclinic, the SC series turbo's are tweaked versions of the default blouch line up, they can advise best route to go,

http://shop.scoobyclinic.com/index.p...ory&path=59_93

 

Its working out a bit cheaper from the us, plus with ball bearing options over journal bearings.

I'll give them a call all the same.

Would a ball bearing 8cm unit spool as fast as a journal bearing 7cm?

 

best bet is speak to them and ask, setup makes a massive difference.

 

Regardless of the 1 cm size difference the spool up from a rollerbearig would be around the same if not quicker as the rollerbearig billet design helps the turbo to spool up earlier down the rpm range.SJ.

 

They can do that, but they won't sell it directly to you. The 7cm roller bearing 1.5XT-R is sold to Scooby Clinic here in the UK only and re-branded as the SC42 turbo. This unit is a 420-450bhp turbocharger.

For your power level and 5 speed box these turbo's are WAY too big. You'll need injectors, FMIC, etc etc to support that. You're far better going for a standard VF range turbo like the VF34 roller bearing unit, VF35, VF43 or VF48 which will all get you to 350bhp easily.

 

I was also going to tell you to speak to my mate Dan at Scoobyclinic as they deal a lot with Blouch turbos,ive been running their turbos for the last 13 years without no problems, as the saying goes you get what you pay for..SJ.

 

Thats a good shout really even just for the price,but if your going to go through the expense of a turbo upgrade you might as well get a more updated one, my first turbo upgrade into hybrid turbos many moons ago Loool was a GT2871R Non billet wheel which made good power compared to my VF35,things change improvements/advancements are made so my advice would be to get some of the new turbo science and get a turbo from the new school.SJ.

 

True, but for the final goal of the car he won't do bad at all with a decent quality refurbished VF turbo like the VF43 with a billet compressor wheel conversion. He can pick that up for £550 from one of the normal turbo guys like Craig Belworthy or get it done himself possibly cheaper by sending a used VF turbo to Turbo Dynamics. As you mentioned above, some of the aftermarket GT turbo's are very good now and already come with roller bearing garret cores and billet wheels, so worth a look around.

SC will sell you a quality product no doubt, but they'll charge well for it and from what the OP was saying I don't think this is a no budget build.

 

I was under the impression that vf turbos aren't rebuild able, now one would touch my vf24 when it let go. hence why i was staying clear of the vf lineup.

Whats the point of buying second hand for it to only **** itself and not be able to build it again.

 

Nope, that's rubbish. Someone told you a porkie pie there. You can still get the cores for the whole VF range of turbos and they can still be rebuilt just fine. Speak to Craig or Turbo Dynamics. They will be able to rebuild yours and even do a billet upgrade for you, or just buy a refurbished VF35 which will essentially be a brand new turbo.

 

I'm with BPR. If you're aiming for 350, get a 350 capable turbo, as otherwise you will end up with a car that has rubbish spool, when compared to a car with a 350hp turbo.

You can also sell the vfXX series turbo if upgrading, especially if you have proof of a rebuild.


Regarding spool threshold, I am personally not convinced there's much between a roller bearing Vs sleeve bearing turbo. MAYBE in transient boost response mid corner, but if the wheels are the same there should not be a lot of difference. The roller bearing may have a little less drag than a journal bearing, but the shaft is thicker and the bearing cage also adds mass to the rotating assy.

It would be extremely interesting to hook a turbo up to a high pressure oil system outside a car to see how well a roller bearing turbo spins when the shaft is floating in the oil, rather than dragging on the walls (which happens when the turbo is spun up outside the car usually).

 

FWIW I reckon a refurbed VF35 is the way to go. It will manage about 320 to 340 on 95 RON fuel. Thats exactly what mine made on my RA. I had it on simtek with 95/99 maps. 330 on 95 and 360 on 99. Was on a TMIC so FMIC will likely make a little more top end.

 

There is a lot to be said about sacrificing spool for the sake of number chasing.
I was very close to pulling the trigger on a Blouch 18g with a 8cm hot side.
Would it have been better on the road than my VF48 @ 1.5 bar on a forged 2.5 ?

Probably ... but 20-30 bhp for ££££

Not worth it Imo

Siv.

 

I've got a new ( bought 3 years ago but never fitted) blouch 18g xtr (8cm) in the cupboard if you decide you want to go that way, looking for £1150 if you're interested.

I'm guessing it's the one that Siv almost bought?
​
Cheers,

Chris.

 

Sc36 would be a good shout

 

The guys have beat me to it but VF35 or VF34 for a road car. If you decide to go forged turn the boost up. Its all about the driveability for a fast road car. No point having stupid amounts of lag

Also 5 speeds do and will break lol I should know been through way too many

 

Pugtk don't forget to update this thread if you do eventually upgrade it would be good to read which turbo you get and how you are finding it on your setup.SJ.

 

Hi Lads,

Another option, I found a guy who will rebuild my vf24, basically machining out my housing and installing a vf48 cartridge. He said it should be good for 320-330bhp. torque a little less on 95 ron.

So Spec would be:
340 Fuji Racing Pump -ICP Pump
Fuel Reg
440cc
Fmic
3" Turbo Back
SARD Induction kit
Tuned on a ESL ECU

Part of me would like to push for 350bhp/330ftlbs, part of me wants to keep the car in one piece.

 

Right now im on vf35,if turbo let down I will try sc36 for sure.

 

Which TMIC were you using?

 

Newage STI TMIC.

 

Was that with a classic scoop?

Was there much of a difference between the 95/99 map in actually real life driving?