H4RDY-P1

iTrader: (46)

I am currently running a vf35 which i think uses the smallest p15 exhaust housing, causing me to have really bad surge issues! ,does the vf34 have a bigger exhaust housing or the same?

MartynJ

VF34 has a P20 housing....

jimmy95wrx

VF34 USES A P18 HOUSING, VF35 WILL SURGE IF U HAVNT OPENED UP THEN PENNYFLAP A FEW MM

H4RDY-P1

iTrader: (46)

Hmm p18 and p20 which is it?,and whats all that about opening up the vf 35's flaps .

stoneface

iTrader: (6)

P18

Lateral Performance

iTrader: (20)

VF34 has a P18

H4RDY-P1

iTrader: (46)

P18 it must be then,so should i stick with the vf35 and port out the penny hole,or just replace it with a vf34?or will the 34 still benefit from a little porting?,im getting to the end of my tether now trying to cure this bloody compressor surge,and dont want to do the job twice,ie remove and port the 35 re-fit and still the same,thanks for the replies guys.

Butty

iTrader: (2)

Port the wastegate by 1-2mm and also the lower side of the wastegate inlet throat.
This and good remapping removed practically all traces of surge on mine.
Alernatively, the VF43 from a Hawkeye STi may be another option

nick

P1 FEK

iTrader: (1)

What are the differences between the VF34 & VF35?

stoneface

iTrader: (6)

Vf34 has p18 ex housing Vf35 has p15 housing, Vf34 is ball bearing 35 is not. Both have same compressor housing

H4RDY-P1

iTrader: (46)

Looks like ill be lookin for a vf34 then,will this still need porting out?

P1 FEK

iTrader: (1)

I have a VF34 on a P1 making 350bhp/320lbft @1.6bar, you'll luv it

H4RDY-P1

iTrader: (46)

I love the vf 35 that is making 347bhp and 340lbft @1.4 bar,its just a surgy old thing!!,are you on standard 440 injectors,P1fek?

H4RDY-P1

iTrader: (46)

Oh and you say 1.6 bar ,is that on a standard motor? or does it peak at that in 5th?,mine is set at 1.35 bar but i do see 1.55 in 5th,is this normal?

P1 FEK

iTrader: (1)

That's on a rebuilt motor with uprated pistons etc. I have a Apexi AVC-R set at 1.5 but it seems to hold 1.6 to 7K but I don't rev it any harder. I think 1.55 is quite high on a standard motor, I take it it's been mapped? What do you mean by set at 1.35?