Timur 008

iTrader: (2)

Hi peeps, i'm not sure what the full name it is? all i can see is IHI so which VF turbo does that make? is it VF30? my car made 345bhp on the rollers with some mods on a standard JDM ecu with this turbo. I am v happy with the result just curious what it is.. as i read there are 2 different turbos on the bugeye models - mine is a 51 plate.. not sure that helps.

cheers
Tim

joz8968

iTrader: (13)

Don't the early New Age STi's have a VF35 as OEM fitment?

Timur 008

iTrader: (2)

i dunno? is the VF35 better then the VF30? i hope i got the better one on it anyone else know what turbo is on the 51 JDM WRX STI's? & whats the maximum to get out of them?? I was told by my mapper that 340bhp is the maximum you'd get on these cars (on a good day too!) but mine accieved 345bhp well chuffed with the result.. just curious which turbo i got?? all i know its defo a IHI model

joz8968

iTrader: (13)

Yeah, 99% certain it has a VF35.

And yes, 340bhp is roughly the ball park... or 340-350 if 'lucky' - as you have been!

Timur 008

iTrader: (2)

cheers Joz so the VF35 is better then the VF30? as i read the ball mark for the VF30 is 330bhp max. Do you know if the VF35 is a rollerbearing?

joz8968

iTrader: (13)

Yeah, VF35/34 better option than VF30.

VF34, I think, is the roller bearing version of the VF35. VF35 has a conventional 'coin'-like 360deg thrust bearing, suspending the shaft.

If memory servevs, the VF35 has a bit better top end; VF34 has a bit better spool... or it may be vice versa lol.

Timur 008

iTrader: (2)

hehehe cool thanks for the info Joz top stuff one last whats the advantages of roller bearing or trust bearings to a normal turbo? is it the life-span or spool/power??

joz8968

iTrader: (13)

I think roller bearings spool better (and/or have better top end)... but I think they may be more fragile than a conventional thrust bearing.

Or, it could be vice versa again!

Timur 008

iTrader: (2)

cheers

philhasasti

jdm bugeyes sti came with vf30 turbos!! the uk bugeye didnt

joz8968

iTrader: (13)

Oh right.

Sorry Timur, you was right!... I was talking crap.

Timur 008

iTrader: (2)

oh! ok, wasn't there 2 versions though? one with vf30 & the other...?? i thought the vf30 was only capable of max 330bhp? wasn't sure i had that as my car is pushing 345bhp. ps. what did the UK spec get?

Shmerman

iTrader: (14)

A VF30 is the same turbo as the VF34 apart from its not a rollerbearing.

The VF35 has a smaller exhaust housing so will not make as much topend as the 34 or the 30 but will out spool both all things being equal.

Timur 008

iTrader: (2)

So basically on my bugeye i have a VF30 & the claims of 330ish max bhp is bullcrap as mine hit 345bhp & there abouts with lbs of torque too!

still i'm curious about this i found on ScoobyWorld - maybe my car has this IHI turbo? Turbos : Subaru Impreza Turbo IHI VF-34
or just read here...
IHI turbocharger Suitable for: Subaru Impreza STI 2.0L The IHI VF-34 Turbo is found on the limited production Subaru v7 WRX STI-RA (GDB). This turbo is differentiated from the VF30 through it's more advanced bearing design. The bearing design allows for much quicker turbo spool-up (depending on tuning, 300-500+ RPMs over the VF30), while retaining the power capabilities of the VF30. The VF34 is capable of 350+ HP (~300+whp) This turbo is a direct bolt-on for all GC8, GDA, GDB EJ20 turbo engines. This is an excellent replacement turbo for those looking for substantial power gains while maintaining streetability.

joz8968

iTrader: (13)

No, not bullcrap.

As with all car tuning, sometimes you get better than expected figures; other times not so lucky. To compound this, the turbo'd EJ engines can be especially fickle in this regard.


The VF34 is basically a roller-bearing equivalent of the VF35. The VF35 - if I'm correct this time lol - was fitted to the Blobeye 2003 STi's (I think).

Shmerman

iTrader: (14)

Its not the equivalent of the 35. see my post above.

Timur 008

iTrader: (2)

Hmm.. ok! well at least i know what turbo i got on then & what its hitting in terms of power so all is good eitherway. Thanks chaps for the quick response top stuff

New_scooby_04

iTrader: (4)

What he said.

In practice there is usually little difference between the two, but as Sherman says, the 35 usually spools slightly better and the 34 usually makes a little more power. Both very good turbos. 35 can usually be had significantly cheaper which is the clincher for most. Only downside is that is can be a bit surge prone.

Ns04

joz8968

iTrader: (13)

Indeed, if you're getting 345!!! out of the quick-spooling VF30, then keep it!

Only if you want to go further, then consider a different turbo.

Timur 008

iTrader: (2)

Cool! cheers Ns04 any more info the VF30?? i know as above they say its the same as a VF34 just not rollerbearing.. does this mean they are stronger then the VF35 then if they are cheaper? & is the VF35 introduced on teh blobeye/v8 onwards? right?

johan84

on which type sti is the VF35 standard turbo?



gr johan

Jonlu

iTrader: (3)

I have a STI7 JDM and mine was safely running 333bhp with similar torque recently on the rollers with a vf30 (which came as standard). Mods are decat and re-map. JGM said these were good figures for the spec and the car made nice smooth curves on the graph. 345bhp is a very good result on that turbo.