chocolate_o_brian

iTrader: (22)

I've emailed Bob to ask for the boost figures Was done on the road and I have the graph somewhere.

Modifications

iTrader: (6)

whats the differance between the VF34 and VF35

which would be more suitable for me. im looking for 320 or maybe more

jura11

iTrader: (7)

Difference between the VF34 and VF35 is VF34 is ball bearing turbo and using P18 exhaust housing and VF35 is thrust bearing turbo and using P15,which means smaller exhaust housing better spool up,but worse top end.

For your goals i would go like with VF34 or VF35,but VF35 is easier to find and usually with this turbo you should make 320-340bhp.

In real life i love the VF34 which is in my view great turbo and perfect on WRX and classic without the AVCS heads

Jura

Modifications

iTrader: (6)

VF35 it is m8, thanks for the info

bigsinky

1.6 bar pffftttttttt. amateurs

RICK...

iTrader: (2)

Let me know how you get on as I'm after the exact same parts and power for my classic! Currently running 263bhp.

Do the VF34/35 turbo's bolt straight on? Or require modifcation?

Cheers

midnight

iTrader: (10)

Both turbos bolt straight on,but dont neglect a good vf23/24/28 which can all make 320+bhp with supporting mods,and can also be cheaper to buy than a vf34,with just as quick spool up. The trick is to find a good 2nd hand one imho.

RICK...

iTrader: (2)

Cheers mate, will have a good look

MrNoisy

iTrader: (28)

To the OP - I went through a similar exercise mate.
If you have a blob it'll probably make more power than a bugeye.

My car made 324/320 with:
- STI Top Mount
- STI Pinks
- VF35
- Harvey up pipe
- Prodrive sports cat and decat centre into 3" back exhaust & backbox
- Green filter
- Walbro
- 3 port boost solenoid

TBH it's a great car now, especially lower down the rev range (with the Harvey up pipe spool comes in 500rpm earlier than the STI up pipe I was previously running), but I'd like to potentially extract 20-30bhp more without jeapourdising the reliability of the car.
For this reason I'm buying a blob STI, and will probably go down the MD321 or similar turbo route; the simple fact is that by the time you factor in the price of buyign and installing the gearbox and running gear you might as well just buy an STI (if only I'd been honest with myself before I started!)

Can't comment on the VF34 as I've never had one on the car; but with my VF35 I'd say they're a midrange and top end improvement on your TD04 and you'll notice the most different in 3rd gear and above.

FYI Harvey has said in the past several of his customers run a WRX gearbox with 400bhp; it's all about how sensible you are.
If you go launching it off the lights all day then tbh you'll get what you deserve - a broken gearbox lol.

Modifications

iTrader: (6)

nice info buddy but i have made a choice of 320 bhp or there abouts any more then i will just get an STI as you said the cost factor etc.

but many thanks to all for the help and info.... im just wanting for the parts to arrive and need to find a VF35... So if anyone has a low millage one lying arround please let me know


regards

colin

Modifications

iTrader: (6)

just a quick question would a VF30 do the job or should i stick with the VF35

jura11

iTrader: (7)

VF30 is good turbo which is mainly found on JDM STi and using P18 exhaust housing same as VF34,just difference between those two is VF34 is ball bearing and VF30 is still thrust bearing and due this will spool slower than VF34 or VF35.
But with good up pipe(Harvey Up pipe is recommended and is proven) you will gain most of spool and will spool similar to the VF35/34

VF35 will spool better on yours and really if you will find VF34 i would go all the way with this turbo VF34


Great turbo and really nicely suited for WRX


Jura

Tidgy

thing is though with a good up pipe on a vf34 you get those extra gains as well. hehe just to throw that into the mix.

VF30 will give slower spool but higher peak figure, rare second hand
VF35 will be cheapest and easiest to get hold of second hand (new age sti's have them so there ten a pennny), struggles top end but better spool.
VF34 is a better turbo (vf35 spool vf30 top end) but rarer and more expensive second hand.
SC36 the daddy in this bracket but more than likley have to go new because there rarer than rocking horse poo second hand.

also as said you'll not be far off the limit of the gearbox and standard internals if you max these turbo's out.

Modifications

iTrader: (6)

cheers buddy, well im going to stick with the VF43, VF35 or a SC36 but these are big bucks lol

i will keep searching

can anyone give me a peak power from the VF30 to VF35 and the SC36

im just interested in the max power they produce :-)

Tidgy

peak varys depending on car and supporting mods, sc's have hit high 300's on pump gas. typicaly 30's 35 will hit 330 ish give or take

jura11

iTrader: (7)

VF43 is bad idea on yours WRX,for best from VF43 you will need at least AVCS heads and preferably 2.5L(on those engine work much better than on 2.0L)


VF30 will make around 350bhp with supported mods.

VF34 is 350bhp turbo and will spool faster than VF30

VF35 is 330-350bhp turbo and usually making those figures and in some cases will make 360bhp(seen just 2 of them)

VF36 is similar to the VF34,but spool up is better on SC36 and power wise from 360bhp+


Jura

Modifications

iTrader: (6)

thanks all good info what sort of price should a VF35 be second hand.... just want a rough guide.

jura11

iTrader: (7)

Price for VF35 is something like from £250-£300


Jura

Modifications

iTrader: (6)

Cheers m8

addi monster

iTrader: (6)

shop around fella, there is a vf34 on here going for £300,, if i can find the link i will post it,.

Modifications

iTrader: (6)

Cheers fella

Modifications

iTrader: (6)

just an update on my little project

i managed to get hold of a VF35

so this is what the car will be mapped with

VF35
Pink injectors
STI Top Mount Intercooler
Walbro Uprated Fuel Pump
3" Cobra 2 decat turbo back ( stock uppipe )
3 Port Boost
K & N Panel Filter

Would like 320BHP so anything more will be a bonus, im trying to get it booked in at the Clinic for the 12th March for Duncan @ racedynamics to map it. Fingers crossed they can fit me in

i will get some print outs up if it all goes well

regards

colin

MrNoisy

iTrader: (28)

If you want 320 mate get rid of the wrx up pipe otherwise you'll probably struggle.
An STI one will be fine.
I have an H&S slip jointed one if u r interested?

Also, make sure your plugs are gapped to around 0.7mm which will help

dynamix

iTrader: (3)

+ 1

BoozyDave

iTrader: (8)

It's a good list of parts, nearly the same as mine

But I'd definitely change the up pipe too

Modifications

iTrader: (6)

yep trying to get one now :-)

what did yours make fella

MrNoisy

iTrader: (28)

The Hayward and Scott one I have is slip jointed stainless steel and is virtually brand new - it was only on the car for 1000 miles; have now got an STI with a Harvey one.

With the mods there you should easily see 320.

Cost me £120 new - will let it go for £90 + postage if you want it.
PM me if interested.

Modifications

iTrader: (6)

i might have got one sorted but its from a version 7 STI is that de-cat or got a cat in it

MrNoisy

iTrader: (28)

Will be de-cat

Modifications

iTrader: (6)

cheers