Turbo IHI VF42 (STI S204) with STI 2.5 Engine
 

I am seeing the possibility of mounting this turbo in my STI 2,5 and I wanted to know if some has that turbo and is as wonderful as they say.

It is compatible turbo IHI VF42 (STI S204 JDM) with STI MY06 Type UK?

REGARDS from Spain:thumb: , Jose

(Sorry my English)

VF42 is a twin scroll unit and is only compatible with JDM cars. In order to use it on an UK car you will need equal length headers, different up and down pipe and a different sump.

VF42 probably wouldn't be suited to a 2.5 engine anyway.

No need to apologise for your English either, it is better than my Spanish!

:cry: ....with the good thing that it is… I am going to put Down pipe Zero Sports CAT High Flow compatible Twin Scroll Turbo and Exhaust Prodrive P1 Competition (JDM only, does not make in UK)...
I have a problem in my STI MY06, IHI VF43 blow to 1,2Bar is standard!!, I have not changed anything and I need more big turbo and seems to me very good option.:rolleyes:

The 2.5 in standard form isnt a strong engine, mainly down to the design of the pistons, pushing it too far will leave you needing more than a new turbo :eek: they do say that much above 370bhp is your limit, Prodrive keep this under 350bhp (320ps quoted for the PPP), and they do some serious extensive testing on these ;)

Tony:)

Hola Jose

What have you changed on the car at the moment to make the VF43 boost to 1.2 bar? Has it been remapped already? I would think the VF42 would work great on the 2.5 but will run out of puff to get peak figures (very similar to the VF43)

Who says 370 is the limit and that the 2.5 isnt a strong engine Tony? - Other people (well known tuners) have said 500bhp is mapped det free.

Yes it isnt a strong engine in standard form, map it to 500 bhp and it wont last at all, the pistons are a serious weak point on the standard engines.

Tony:)

-The car does not have modified nothing! No remap, nothing, Now is standard!!!
When it changes the Down pipe and Exhaust, Which is the blowing limits of turbo IHI VF43:rolleyes: ?

No you shouldnt be anywhere near the limits though i would remap the engine after changing the downpipe and exhaust if you want reliability (it can cause boost spikes/det and kill your engine quicker than demestos kills germs :eek: )

Tony:)

Should add that the VF42 has a similar non twin scroll equivelant, thats the VF22 :)

Tony:)

But the VF22 has more lag that the VF42, no? A friend has VF22 in his WRX 2001 with 356cv and loads from 4.500rpm... I want is something of MAX Torque between 5.800rpm and 7.000rpm, because 2.5T has much answer average and low regime, But from 5.800rpm it decays much…:rolleyes:

Now you see the joys of twin scroll ;) the VF42 and VF22 use the same housing, think the 42 is slighly bigger but AVCS, Equal length headers and twin scroll still mean you have virtually no lag ;)

Tony:)

Thank you very much Tony, Now I must find out if it is to me compatible EJ25 with ECU Motec M800.;)

Thank you again

your std ecu will be fine

Here in Spain they know very little of Subarus, Only one person and that mounts MOTEC, I think about sending it to UK for Remap with EcuTek, as you see it?:rolleyes:

Your Impreza is beautiful.

Thank you - I am sure a proper mapper would consider coming out to spain to map ... there are worse places to be :D

It will study the option to send the ECU to Power Station or Tracktive Solutions… I would like to mount it to me live and to remap in movement but is imposible.

Unfortunately they wont be able to do that as the ECU reacts to the modifications to the car - it will need to be mapped in the car.

I know some of them go on holiday sometimes, might be worth chatting to some of them to see if they are in Spain at anytime and would have a spare afternoon to map.

The Motec 800 wont be able to control the Drive by Wire Throttle as far as I am aware, so it rules that out I think.

Very difficult I see it, the most viable is to mount MOTEC...In Spain Lancer Evo much Ralliart but of Subaru and Prodrive nothing...:cry: :cry: :cry:

Here, there is..._PROMOTION_Motor_Sport_

Sounds like a huge opportunity for you to arrange a remap group buy for Spain and ask Bob Rawle, Andy F, Pavlo, Jolly Green Monster, Mocom etc whether any of them fancy a hot few days mapping in Spain.

It must have I number minimum of cars so that it comes to Spain and that is really complicated...is complicated for me... :rolleyes:

Where abouts in Spain are you :D

I want to be a mapper now...I'll then have a trip to spain...just scrapped my IT job for something better...:D

I am in Madrid.

You thinking of getting a suntan Zak ? :lol:

I am sure that there are a few others in Spain that would want a remap - could be a free holiday for you and Carryann :cool:

MMMM.....The IHI VF22 It seems very good :norty:

One question...What it is limits of the engine? 350hp, 370hp...?¿? and Max boost IHI VF43?

Very difficult to say really as not many people have taken std engines far.

Mine will be around 380bhp and 420 lb/ft (maybe more) by the end of the week.

The VF43 is suprisingly good but compared to some of the aftermarket turbos is obviously worse.

The key with the tuning is to keep it det free and that can only be done through mapping it for your car/on your car.

I have the pieces of the performance, and I am doubtful of if to continue with the turbocharger stock VF43 or change IHI VF22/42:Suspiciou ... etc

-Headers. Fujitsubo
-Up Pipe. Prova
-Down pipe. Fujitsubo
-Exhaust. Fujitsubo RM-01A

-ECU. Remap + BLITZ SBC-I Color/HKS EVC (Boost Control)

-NGK Iridium IX Sparks Plug + Wires Sets Ultra.

-Walbro 255lb Fuel Pump.

-STI Filter.
-CUSCO Radiator Coolant Hose Kit.
-STI Intercooler Hose Kit.
-Cooling Panel Zero Sports.

I ran a hybrid twin scroll turbo on my 2ltr which performed better than data I had from the VF42. Plenty more turbo's out there.

If you have a 2.5ltr do not bother with these piddly little twin scrolls (they are more suited to the 2ltr at this size). The increased capacity will see quicker spool and greater torque anyhow. If your looking at getting better high rev based torque, you will need to spend a few more pennies. ;)

Having an engine that produces over 300lbft from 3k all the way past 7k is a very quick and driveable car. That what be your ideal aim as a road car. :)

Once you get bored with that, you can remortgage your house and start going for the big guns. :D

We bounced off 530lbft (and thats on PowerStations rollers, which read lower torque than the Dyno Dynamic ones) with my Cosworth 2.5ltr on Saturday, during the initial mapping session on a new turbo. :D

Impressive figures Shaun. Was looking at your intercooler yesterday. Talk about size! :freak3: :eek: Are you sure you've fitted one that was destined for an artic by mistake?;) :lol1: